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assets/chart/src/adapters/adapter.moment.js

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+// TODO v3 - make this adapter external (chartjs-adapter-moment)
+
+'use strict';
+
+var moment = require('moment');
+var adapters = require('../core/core.adapters');
+
+var FORMATS = {
+	datetime: 'MMM D, YYYY, h:mm:ss a',
+	millisecond: 'h:mm:ss.SSS a',
+	second: 'h:mm:ss a',
+	minute: 'h:mm a',
+	hour: 'hA',
+	day: 'MMM D',
+	week: 'll',
+	month: 'MMM YYYY',
+	quarter: '[Q]Q - YYYY',
+	year: 'YYYY'
+};
+
+adapters._date.override(typeof moment === 'function' ? {
+	_id: 'moment', // DEBUG ONLY
+
+	formats: function() {
+		return FORMATS;
+	},
+
+	parse: function(value, format) {
+		if (typeof value === 'string' && typeof format === 'string') {
+			value = moment(value, format);
+		} else if (!(value instanceof moment)) {
+			value = moment(value);
+		}
+		return value.isValid() ? value.valueOf() : null;
+	},
+
+	format: function(time, format) {
+		return moment(time).format(format);
+	},
+
+	add: function(time, amount, unit) {
+		return moment(time).add(amount, unit).valueOf();
+	},
+
+	diff: function(max, min, unit) {
+		return moment(max).diff(moment(min), unit);
+	},
+
+	startOf: function(time, unit, weekday) {
+		time = moment(time);
+		if (unit === 'isoWeek') {
+			return time.isoWeekday(weekday).valueOf();
+		}
+		return time.startOf(unit).valueOf();
+	},
+
+	endOf: function(time, unit) {
+		return moment(time).endOf(unit).valueOf();
+	},
+
+	// DEPRECATIONS
+
+	/**
+	 * Provided for backward compatibility with scale.getValueForPixel().
+	 * @deprecated since version 2.8.0
+	 * @todo remove at version 3
+	 * @private
+	 */
+	_create: function(time) {
+		return moment(time);
+	},
+} : {});

assets/chart/src/adapters/index.js

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+'use strict';
+
+// -----------------------------------------------------------------------------
+// IMPORTANT: do NOT submit new adapters to this repository, instead
+// create an external library named `chartjs-adapter-{lib-name}`
+// -----------------------------------------------------------------------------
+
+// Built-in moment adapter that we need to keep for backward compatibility
+// https://github.com/chartjs/Chart.js/issues/5542
+require('./adapter.moment');

assets/chart/src/controllers/controller.bar.js

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+'use strict';
+
+var DatasetController = require('../core/core.datasetController');
+var defaults = require('../core/core.defaults');
+var elements = require('../elements/index');
+var helpers = require('../helpers/index');
+
+var deprecated = helpers._deprecated;
+var valueOrDefault = helpers.valueOrDefault;
+
+defaults._set('bar', {
+	hover: {
+		mode: 'label'
+	},
+
+	scales: {
+		xAxes: [{
+			type: 'category',
+			offset: true,
+			gridLines: {
+				offsetGridLines: true
+			}
+		}],
+
+		yAxes: [{
+			type: 'linear'
+		}]
+	}
+});
+
+defaults._set('global', {
+	datasets: {
+		bar: {
+			categoryPercentage: 0.8,
+			barPercentage: 0.9
+		}
+	}
+});
+
+/**
+ * Computes the "optimal" sample size to maintain bars equally sized while preventing overlap.
+ * @private
+ */
+function computeMinSampleSize(scale, pixels) {
+	var min = scale._length;
+	var prev, curr, i, ilen;
+
+	for (i = 1, ilen = pixels.length; i < ilen; ++i) {
+		min = Math.min(min, Math.abs(pixels[i] - pixels[i - 1]));
+	}
+
+	for (i = 0, ilen = scale.getTicks().length; i < ilen; ++i) {
+		curr = scale.getPixelForTick(i);
+		min = i > 0 ? Math.min(min, Math.abs(curr - prev)) : min;
+		prev = curr;
+	}
+
+	return min;
+}
+
+/**
+ * Computes an "ideal" category based on the absolute bar thickness or, if undefined or null,
+ * uses the smallest interval (see computeMinSampleSize) that prevents bar overlapping. This
+ * mode currently always generates bars equally sized (until we introduce scriptable options?).
+ * @private
+ */
+function computeFitCategoryTraits(index, ruler, options) {
+	var thickness = options.barThickness;
+	var count = ruler.stackCount;
+	var curr = ruler.pixels[index];
+	var min = helpers.isNullOrUndef(thickness)
+		? computeMinSampleSize(ruler.scale, ruler.pixels)
+		: -1;
+	var size, ratio;
+
+	if (helpers.isNullOrUndef(thickness)) {
+		size = min * options.categoryPercentage;
+		ratio = options.barPercentage;
+	} else {
+		// When bar thickness is enforced, category and bar percentages are ignored.
+		// Note(SB): we could add support for relative bar thickness (e.g. barThickness: '50%')
+		// and deprecate barPercentage since this value is ignored when thickness is absolute.
+		size = thickness * count;
+		ratio = 1;
+	}
+
+	return {
+		chunk: size / count,
+		ratio: ratio,
+		start: curr - (size / 2)
+	};
+}
+
+/**
+ * Computes an "optimal" category that globally arranges bars side by side (no gap when
+ * percentage options are 1), based on the previous and following categories. This mode
+ * generates bars with different widths when data are not evenly spaced.
+ * @private
+ */
+function computeFlexCategoryTraits(index, ruler, options) {
+	var pixels = ruler.pixels;
+	var curr = pixels[index];
+	var prev = index > 0 ? pixels[index - 1] : null;
+	var next = index < pixels.length - 1 ? pixels[index + 1] : null;
+	var percent = options.categoryPercentage;
+	var start, size;
+
+	if (prev === null) {
+		// first data: its size is double based on the next point or,
+		// if it's also the last data, we use the scale size.
+		prev = curr - (next === null ? ruler.end - ruler.start : next - curr);
+	}
+
+	if (next === null) {
+		// last data: its size is also double based on the previous point.
+		next = curr + curr - prev;
+	}
+
+	start = curr - (curr - Math.min(prev, next)) / 2 * percent;
+	size = Math.abs(next - prev) / 2 * percent;
+
+	return {
+		chunk: size / ruler.stackCount,
+		ratio: options.barPercentage,
+		start: start
+	};
+}
+
+module.exports = DatasetController.extend({
+
+	dataElementType: elements.Rectangle,
+
+	/**
+	 * @private
+	 */
+	_dataElementOptions: [
+		'backgroundColor',
+		'borderColor',
+		'borderSkipped',
+		'borderWidth',
+		'barPercentage',
+		'barThickness',
+		'categoryPercentage',
+		'maxBarThickness',
+		'minBarLength'
+	],
+
+	initialize: function() {
+		var me = this;
+		var meta, scaleOpts;
+
+		DatasetController.prototype.initialize.apply(me, arguments);
+
+		meta = me.getMeta();
+		meta.stack = me.getDataset().stack;
+		meta.bar = true;
+
+		scaleOpts = me._getIndexScale().options;
+		deprecated('bar chart', scaleOpts.barPercentage, 'scales.[x/y]Axes.barPercentage', 'dataset.barPercentage');
+		deprecated('bar chart', scaleOpts.barThickness, 'scales.[x/y]Axes.barThickness', 'dataset.barThickness');
+		deprecated('bar chart', scaleOpts.categoryPercentage, 'scales.[x/y]Axes.categoryPercentage', 'dataset.categoryPercentage');
+		deprecated('bar chart', me._getValueScale().options.minBarLength, 'scales.[x/y]Axes.minBarLength', 'dataset.minBarLength');
+		deprecated('bar chart', scaleOpts.maxBarThickness, 'scales.[x/y]Axes.maxBarThickness', 'dataset.maxBarThickness');
+	},
+
+	update: function(reset) {
+		var me = this;
+		var rects = me.getMeta().data;
+		var i, ilen;
+
+		me._ruler = me.getRuler();
+
+		for (i = 0, ilen = rects.length; i < ilen; ++i) {
+			me.updateElement(rects[i], i, reset);
+		}
+	},
+
+	updateElement: function(rectangle, index, reset) {
+		var me = this;
+		var meta = me.getMeta();
+		var dataset = me.getDataset();
+		var options = me._resolveDataElementOptions(rectangle, index);
+
+		rectangle._xScale = me.getScaleForId(meta.xAxisID);
+		rectangle._yScale = me.getScaleForId(meta.yAxisID);
+		rectangle._datasetIndex = me.index;
+		rectangle._index = index;
+		rectangle._model = {
+			backgroundColor: options.backgroundColor,
+			borderColor: options.borderColor,
+			borderSkipped: options.borderSkipped,
+			borderWidth: options.borderWidth,
+			datasetLabel: dataset.label,
+			label: me.chart.data.labels[index]
+		};
+
+		if (helpers.isArray(dataset.data[index])) {
+			rectangle._model.borderSkipped = null;
+		}
+
+		me._updateElementGeometry(rectangle, index, reset, options);
+
+		rectangle.pivot();
+	},
+
+	/**
+	 * @private
+	 */
+	_updateElementGeometry: function(rectangle, index, reset, options) {
+		var me = this;
+		var model = rectangle._model;
+		var vscale = me._getValueScale();
+		var base = vscale.getBasePixel();
+		var horizontal = vscale.isHorizontal();
+		var ruler = me._ruler || me.getRuler();
+		var vpixels = me.calculateBarValuePixels(me.index, index, options);
+		var ipixels = me.calculateBarIndexPixels(me.index, index, ruler, options);
+
+		model.horizontal = horizontal;
+		model.base = reset ? base : vpixels.base;
+		model.x = horizontal ? reset ? base : vpixels.head : ipixels.center;
+		model.y = horizontal ? ipixels.center : reset ? base : vpixels.head;
+		model.height = horizontal ? ipixels.size : undefined;
+		model.width = horizontal ? undefined : ipixels.size;
+	},
+
+	/**
+	 * Returns the stacks based on groups and bar visibility.
+	 * @param {number} [last] - The dataset index
+	 * @returns {string[]} The list of stack IDs
+	 * @private
+	 */
+	_getStacks: function(last) {
+		var me = this;
+		var scale = me._getIndexScale();
+		var metasets = scale._getMatchingVisibleMetas(me._type);
+		var stacked = scale.options.stacked;
+		var ilen = metasets.length;
+		var stacks = [];
+		var i, meta;
+
+		for (i = 0; i < ilen; ++i) {
+			meta = metasets[i];
+			// stacked   | meta.stack
+			//           | found | not found | undefined
+			// false     |   x   |     x     |     x
+			// true      |       |     x     |
+			// undefined |       |     x     |     x
+			if (stacked === false || stacks.indexOf(meta.stack) === -1 ||
+				(stacked === undefined && meta.stack === undefined)) {
+				stacks.push(meta.stack);
+			}
+			if (meta.index === last) {
+				break;
+			}
+		}
+
+		return stacks;
+	},
+
+	/**
+	 * Returns the effective number of stacks based on groups and bar visibility.
+	 * @private
+	 */
+	getStackCount: function() {
+		return this._getStacks().length;
+	},
+
+	/**
+	 * Returns the stack index for the given dataset based on groups and bar visibility.
+	 * @param {number} [datasetIndex] - The dataset index
+	 * @param {string} [name] - The stack name to find
+	 * @returns {number} The stack index
+	 * @private
+	 */
+	getStackIndex: function(datasetIndex, name) {
+		var stacks = this._getStacks(datasetIndex);
+		var index = (name !== undefined)
+			? stacks.indexOf(name)
+			: -1; // indexOf returns -1 if element is not present
+
+		return (index === -1)
+			? stacks.length - 1
+			: index;
+	},
+
+	/**
+	 * @private
+	 */
+	getRuler: function() {
+		var me = this;
+		var scale = me._getIndexScale();
+		var pixels = [];
+		var i, ilen;
+
+		for (i = 0, ilen = me.getMeta().data.length; i < ilen; ++i) {
+			pixels.push(scale.getPixelForValue(null, i, me.index));
+		}
+
+		return {
+			pixels: pixels,
+			start: scale._startPixel,
+			end: scale._endPixel,
+			stackCount: me.getStackCount(),
+			scale: scale
+		};
+	},
+
+	/**
+	 * Note: pixel values are not clamped to the scale area.
+	 * @private
+	 */
+	calculateBarValuePixels: function(datasetIndex, index, options) {
+		var me = this;
+		var chart = me.chart;
+		var scale = me._getValueScale();
+		var isHorizontal = scale.isHorizontal();
+		var datasets = chart.data.datasets;
+		var metasets = scale._getMatchingVisibleMetas(me._type);
+		var value = scale._parseValue(datasets[datasetIndex].data[index]);
+		var minBarLength = options.minBarLength;
+		var stacked = scale.options.stacked;
+		var stack = me.getMeta().stack;
+		var start = value.start === undefined ? 0 : value.max >= 0 && value.min >= 0 ? value.min : value.max;
+		var length = value.start === undefined ? value.end : value.max >= 0 && value.min >= 0 ? value.max - value.min : value.min - value.max;
+		var ilen = metasets.length;
+		var i, imeta, ivalue, base, head, size, stackLength;
+
+		if (stacked || (stacked === undefined && stack !== undefined)) {
+			for (i = 0; i < ilen; ++i) {
+				imeta = metasets[i];
+
+				if (imeta.index === datasetIndex) {
+					break;
+				}
+
+				if (imeta.stack === stack) {
+					stackLength = scale._parseValue(datasets[imeta.index].data[index]);
+					ivalue = stackLength.start === undefined ? stackLength.end : stackLength.min >= 0 && stackLength.max >= 0 ? stackLength.max : stackLength.min;
+
+					if ((value.min < 0 && ivalue < 0) || (value.max >= 0 && ivalue > 0)) {
+						start += ivalue;
+					}
+				}
+			}
+		}
+
+		base = scale.getPixelForValue(start);
+		head = scale.getPixelForValue(start + length);
+		size = head - base;
+
+		if (minBarLength !== undefined && Math.abs(size) < minBarLength) {
+			size = minBarLength;
+			if (length >= 0 && !isHorizontal || length < 0 && isHorizontal) {
+				head = base - minBarLength;
+			} else {
+				head = base + minBarLength;
+			}
+		}
+
+		return {
+			size: size,
+			base: base,
+			head: head,
+			center: head + size / 2
+		};
+	},
+
+	/**
+	 * @private
+	 */
+	calculateBarIndexPixels: function(datasetIndex, index, ruler, options) {
+		var me = this;
+		var range = options.barThickness === 'flex'
+			? computeFlexCategoryTraits(index, ruler, options)
+			: computeFitCategoryTraits(index, ruler, options);
+
+		var stackIndex = me.getStackIndex(datasetIndex, me.getMeta().stack);
+		var center = range.start + (range.chunk * stackIndex) + (range.chunk / 2);
+		var size = Math.min(
+			valueOrDefault(options.maxBarThickness, Infinity),
+			range.chunk * range.ratio);
+
+		return {
+			base: center - size / 2,
+			head: center + size / 2,
+			center: center,
+			size: size
+		};
+	},
+
+	draw: function() {
+		var me = this;
+		var chart = me.chart;
+		var scale = me._getValueScale();
+		var rects = me.getMeta().data;
+		var dataset = me.getDataset();
+		var ilen = rects.length;
+		var i = 0;
+
+		helpers.canvas.clipArea(chart.ctx, chart.chartArea);
+
+		for (; i < ilen; ++i) {
+			var val = scale._parseValue(dataset.data[i]);
+			if (!isNaN(val.min) && !isNaN(val.max)) {
+				rects[i].draw();
+			}
+		}
+
+		helpers.canvas.unclipArea(chart.ctx);
+	},
+
+	/**
+	 * @private
+	 */
+	_resolveDataElementOptions: function() {
+		var me = this;
+		var values = helpers.extend({}, DatasetController.prototype._resolveDataElementOptions.apply(me, arguments));
+		var indexOpts = me._getIndexScale().options;
+		var valueOpts = me._getValueScale().options;
+
+		values.barPercentage = valueOrDefault(indexOpts.barPercentage, values.barPercentage);
+		values.barThickness = valueOrDefault(indexOpts.barThickness, values.barThickness);
+		values.categoryPercentage = valueOrDefault(indexOpts.categoryPercentage, values.categoryPercentage);
+		values.maxBarThickness = valueOrDefault(indexOpts.maxBarThickness, values.maxBarThickness);
+		values.minBarLength = valueOrDefault(valueOpts.minBarLength, values.minBarLength);
+
+		return values;
+	}
+
+});

assets/chart/src/controllers/controller.bubble.js

@@ -0,0 +1,172 @@
+'use strict';
+
+var DatasetController = require('../core/core.datasetController');
+var defaults = require('../core/core.defaults');
+var elements = require('../elements/index');
+var helpers = require('../helpers/index');
+
+var valueOrDefault = helpers.valueOrDefault;
+var resolve = helpers.options.resolve;
+
+defaults._set('bubble', {
+	hover: {
+		mode: 'single'
+	},
+
+	scales: {
+		xAxes: [{
+			type: 'linear', // bubble should probably use a linear scale by default
+			position: 'bottom',
+			id: 'x-axis-0' // need an ID so datasets can reference the scale
+		}],
+		yAxes: [{
+			type: 'linear',
+			position: 'left',
+			id: 'y-axis-0'
+		}]
+	},
+
+	tooltips: {
+		callbacks: {
+			title: function() {
+				// Title doesn't make sense for scatter since we format the data as a point
+				return '';
+			},
+			label: function(item, data) {
+				var datasetLabel = data.datasets[item.datasetIndex].label || '';
+				var dataPoint = data.datasets[item.datasetIndex].data[item.index];
+				return datasetLabel + ': (' + item.xLabel + ', ' + item.yLabel + ', ' + dataPoint.r + ')';
+			}
+		}
+	}
+});
+
+module.exports = DatasetController.extend({
+	/**
+	 * @protected
+	 */
+	dataElementType: elements.Point,
+
+	/**
+	 * @private
+	 */
+	_dataElementOptions: [
+		'backgroundColor',
+		'borderColor',
+		'borderWidth',
+		'hoverBackgroundColor',
+		'hoverBorderColor',
+		'hoverBorderWidth',
+		'hoverRadius',
+		'hitRadius',
+		'pointStyle',
+		'rotation'
+	],
+
+	/**
+	 * @protected
+	 */
+	update: function(reset) {
+		var me = this;
+		var meta = me.getMeta();
+		var points = meta.data;
+
+		// Update Points
+		helpers.each(points, function(point, index) {
+			me.updateElement(point, index, reset);
+		});
+	},
+
+	/**
+	 * @protected
+	 */
+	updateElement: function(point, index, reset) {
+		var me = this;
+		var meta = me.getMeta();
+		var custom = point.custom || {};
+		var xScale = me.getScaleForId(meta.xAxisID);
+		var yScale = me.getScaleForId(meta.yAxisID);
+		var options = me._resolveDataElementOptions(point, index);
+		var data = me.getDataset().data[index];
+		var dsIndex = me.index;
+
+		var x = reset ? xScale.getPixelForDecimal(0.5) : xScale.getPixelForValue(typeof data === 'object' ? data : NaN, index, dsIndex);
+		var y = reset ? yScale.getBasePixel() : yScale.getPixelForValue(data, index, dsIndex);
+
+		point._xScale = xScale;
+		point._yScale = yScale;
+		point._options = options;
+		point._datasetIndex = dsIndex;
+		point._index = index;
+		point._model = {
+			backgroundColor: options.backgroundColor,
+			borderColor: options.borderColor,
+			borderWidth: options.borderWidth,
+			hitRadius: options.hitRadius,
+			pointStyle: options.pointStyle,
+			rotation: options.rotation,
+			radius: reset ? 0 : options.radius,
+			skip: custom.skip || isNaN(x) || isNaN(y),
+			x: x,
+			y: y,
+		};
+
+		point.pivot();
+	},
+
+	/**
+	 * @protected
+	 */
+	setHoverStyle: function(point) {
+		var model = point._model;
+		var options = point._options;
+		var getHoverColor = helpers.getHoverColor;
+
+		point.$previousStyle = {
+			backgroundColor: model.backgroundColor,
+			borderColor: model.borderColor,
+			borderWidth: model.borderWidth,
+			radius: model.radius
+		};
+
+		model.backgroundColor = valueOrDefault(options.hoverBackgroundColor, getHoverColor(options.backgroundColor));
+		model.borderColor = valueOrDefault(options.hoverBorderColor, getHoverColor(options.borderColor));
+		model.borderWidth = valueOrDefault(options.hoverBorderWidth, options.borderWidth);
+		model.radius = options.radius + options.hoverRadius;
+	},
+
+	/**
+	 * @private
+	 */
+	_resolveDataElementOptions: function(point, index) {
+		var me = this;
+		var chart = me.chart;
+		var dataset = me.getDataset();
+		var custom = point.custom || {};
+		var data = dataset.data[index] || {};
+		var values = DatasetController.prototype._resolveDataElementOptions.apply(me, arguments);
+
+		// Scriptable options
+		var context = {
+			chart: chart,
+			dataIndex: index,
+			dataset: dataset,
+			datasetIndex: me.index
+		};
+
+		// In case values were cached (and thus frozen), we need to clone the values
+		if (me._cachedDataOpts === values) {
+			values = helpers.extend({}, values);
+		}
+
+		// Custom radius resolution
+		values.radius = resolve([
+			custom.radius,
+			data.r,
+			me._config.radius,
+			chart.options.elements.point.radius
+		], context, index);
+
+		return values;
+	}
+});

assets/chart/src/controllers/controller.doughnut.js

@@ -0,0 +1,390 @@
+'use strict';
+
+var DatasetController = require('../core/core.datasetController');
+var defaults = require('../core/core.defaults');
+var elements = require('../elements/index');
+var helpers = require('../helpers/index');
+
+var valueOrDefault = helpers.valueOrDefault;
+
+var PI = Math.PI;
+var DOUBLE_PI = PI * 2;
+var HALF_PI = PI / 2;
+
+defaults._set('doughnut', {
+	animation: {
+		// Boolean - Whether we animate the rotation of the Doughnut
+		animateRotate: true,
+		// Boolean - Whether we animate scaling the Doughnut from the centre
+		animateScale: false
+	},
+	hover: {
+		mode: 'single'
+	},
+	legendCallback: function(chart) {
+		var list = document.createElement('ul');
+		var data = chart.data;
+		var datasets = data.datasets;
+		var labels = data.labels;
+		var i, ilen, listItem, listItemSpan;
+
+		list.setAttribute('class', chart.id + '-legend');
+		if (datasets.length) {
+			for (i = 0, ilen = datasets[0].data.length; i < ilen; ++i) {
+				listItem = list.appendChild(document.createElement('li'));
+				listItemSpan = listItem.appendChild(document.createElement('span'));
+				listItemSpan.style.backgroundColor = datasets[0].backgroundColor[i];
+				if (labels[i]) {
+					listItem.appendChild(document.createTextNode(labels[i]));
+				}
+			}
+		}
+
+		return list.outerHTML;
+	},
+	legend: {
+		labels: {
+			generateLabels: function(chart) {
+				var data = chart.data;
+				if (data.labels.length && data.datasets.length) {
+					return data.labels.map(function(label, i) {
+						var meta = chart.getDatasetMeta(0);
+						var style = meta.controller.getStyle(i);
+
+						return {
+							text: label,
+							fillStyle: style.backgroundColor,
+							strokeStyle: style.borderColor,
+							lineWidth: style.borderWidth,
+							hidden: isNaN(data.datasets[0].data[i]) || meta.data[i].hidden,
+
+							// Extra data used for toggling the correct item
+							index: i
+						};
+					});
+				}
+				return [];
+			}
+		},
+
+		onClick: function(e, legendItem) {
+			var index = legendItem.index;
+			var chart = this.chart;
+			var i, ilen, meta;
+
+			for (i = 0, ilen = (chart.data.datasets || []).length; i < ilen; ++i) {
+				meta = chart.getDatasetMeta(i);
+				// toggle visibility of index if exists
+				if (meta.data[index]) {
+					meta.data[index].hidden = !meta.data[index].hidden;
+				}
+			}
+
+			chart.update();
+		}
+	},
+
+	// The percentage of the chart that we cut out of the middle.
+	cutoutPercentage: 50,
+
+	// The rotation of the chart, where the first data arc begins.
+	rotation: -HALF_PI,
+
+	// The total circumference of the chart.
+	circumference: DOUBLE_PI,
+
+	// Need to override these to give a nice default
+	tooltips: {
+		callbacks: {
+			title: function() {
+				return '';
+			},
+			label: function(tooltipItem, data) {
+				var dataLabel = data.labels[tooltipItem.index];
+				var value = ': ' + data.datasets[tooltipItem.datasetIndex].data[tooltipItem.index];
+
+				if (helpers.isArray(dataLabel)) {
+					// show value on first line of multiline label
+					// need to clone because we are changing the value
+					dataLabel = dataLabel.slice();
+					dataLabel[0] += value;
+				} else {
+					dataLabel += value;
+				}
+
+				return dataLabel;
+			}
+		}
+	}
+});
+
+module.exports = DatasetController.extend({
+
+	dataElementType: elements.Arc,
+
+	linkScales: helpers.noop,
+
+	/**
+	 * @private
+	 */
+	_dataElementOptions: [
+		'backgroundColor',
+		'borderColor',
+		'borderWidth',
+		'borderAlign',
+		'hoverBackgroundColor',
+		'hoverBorderColor',
+		'hoverBorderWidth',
+	],
+
+	// Get index of the dataset in relation to the visible datasets. This allows determining the inner and outer radius correctly
+	getRingIndex: function(datasetIndex) {
+		var ringIndex = 0;
+
+		for (var j = 0; j < datasetIndex; ++j) {
+			if (this.chart.isDatasetVisible(j)) {
+				++ringIndex;
+			}
+		}
+
+		return ringIndex;
+	},
+
+	update: function(reset) {
+		var me = this;
+		var chart = me.chart;
+		var chartArea = chart.chartArea;
+		var opts = chart.options;
+		var ratioX = 1;
+		var ratioY = 1;
+		var offsetX = 0;
+		var offsetY = 0;
+		var meta = me.getMeta();
+		var arcs = meta.data;
+		var cutout = opts.cutoutPercentage / 100 || 0;
+		var circumference = opts.circumference;
+		var chartWeight = me._getRingWeight(me.index);
+		var maxWidth, maxHeight, i, ilen;
+
+		// If the chart's circumference isn't a full circle, calculate size as a ratio of the width/height of the arc
+		if (circumference < DOUBLE_PI) {
+			var startAngle = opts.rotation % DOUBLE_PI;
+			startAngle += startAngle >= PI ? -DOUBLE_PI : startAngle < -PI ? DOUBLE_PI : 0;
+			var endAngle = startAngle + circumference;
+			var startX = Math.cos(startAngle);
+			var startY = Math.sin(startAngle);
+			var endX = Math.cos(endAngle);
+			var endY = Math.sin(endAngle);
+			var contains0 = (startAngle <= 0 && endAngle >= 0) || endAngle >= DOUBLE_PI;
+			var contains90 = (startAngle <= HALF_PI && endAngle >= HALF_PI) || endAngle >= DOUBLE_PI + HALF_PI;
+			var contains180 = startAngle === -PI || endAngle >= PI;
+			var contains270 = (startAngle <= -HALF_PI && endAngle >= -HALF_PI) || endAngle >= PI + HALF_PI;
+			var minX = contains180 ? -1 : Math.min(startX, startX * cutout, endX, endX * cutout);
+			var minY = contains270 ? -1 : Math.min(startY, startY * cutout, endY, endY * cutout);
+			var maxX = contains0 ? 1 : Math.max(startX, startX * cutout, endX, endX * cutout);
+			var maxY = contains90 ? 1 : Math.max(startY, startY * cutout, endY, endY * cutout);
+			ratioX = (maxX - minX) / 2;
+			ratioY = (maxY - minY) / 2;
+			offsetX = -(maxX + minX) / 2;
+			offsetY = -(maxY + minY) / 2;
+		}
+
+		for (i = 0, ilen = arcs.length; i < ilen; ++i) {
+			arcs[i]._options = me._resolveDataElementOptions(arcs[i], i);
+		}
+
+		chart.borderWidth = me.getMaxBorderWidth();
+		maxWidth = (chartArea.right - chartArea.left - chart.borderWidth) / ratioX;
+		maxHeight = (chartArea.bottom - chartArea.top - chart.borderWidth) / ratioY;
+		chart.outerRadius = Math.max(Math.min(maxWidth, maxHeight) / 2, 0);
+		chart.innerRadius = Math.max(chart.outerRadius * cutout, 0);
+		chart.radiusLength = (chart.outerRadius - chart.innerRadius) / (me._getVisibleDatasetWeightTotal() || 1);
+		chart.offsetX = offsetX * chart.outerRadius;
+		chart.offsetY = offsetY * chart.outerRadius;
+
+		meta.total = me.calculateTotal();
+
+		me.outerRadius = chart.outerRadius - chart.radiusLength * me._getRingWeightOffset(me.index);
+		me.innerRadius = Math.max(me.outerRadius - chart.radiusLength * chartWeight, 0);
+
+		for (i = 0, ilen = arcs.length; i < ilen; ++i) {
+			me.updateElement(arcs[i], i, reset);
+		}
+	},
+
+	updateElement: function(arc, index, reset) {
+		var me = this;
+		var chart = me.chart;
+		var chartArea = chart.chartArea;
+		var opts = chart.options;
+		var animationOpts = opts.animation;
+		var centerX = (chartArea.left + chartArea.right) / 2;
+		var centerY = (chartArea.top + chartArea.bottom) / 2;
+		var startAngle = opts.rotation; // non reset case handled later
+		var endAngle = opts.rotation; // non reset case handled later
+		var dataset = me.getDataset();
+		var circumference = reset && animationOpts.animateRotate ? 0 : arc.hidden ? 0 : me.calculateCircumference(dataset.data[index]) * (opts.circumference / DOUBLE_PI);
+		var innerRadius = reset && animationOpts.animateScale ? 0 : me.innerRadius;
+		var outerRadius = reset && animationOpts.animateScale ? 0 : me.outerRadius;
+		var options = arc._options || {};
+
+		helpers.extend(arc, {
+			// Utility
+			_datasetIndex: me.index,
+			_index: index,
+
+			// Desired view properties
+			_model: {
+				backgroundColor: options.backgroundColor,
+				borderColor: options.borderColor,
+				borderWidth: options.borderWidth,
+				borderAlign: options.borderAlign,
+				x: centerX + chart.offsetX,
+				y: centerY + chart.offsetY,
+				startAngle: startAngle,
+				endAngle: endAngle,
+				circumference: circumference,
+				outerRadius: outerRadius,
+				innerRadius: innerRadius,
+				label: helpers.valueAtIndexOrDefault(dataset.label, index, chart.data.labels[index])
+			}
+		});
+
+		var model = arc._model;
+
+		// Set correct angles if not resetting
+		if (!reset || !animationOpts.animateRotate) {
+			if (index === 0) {
+				model.startAngle = opts.rotation;
+			} else {
+				model.startAngle = me.getMeta().data[index - 1]._model.endAngle;
+			}
+
+			model.endAngle = model.startAngle + model.circumference;
+		}
+
+		arc.pivot();
+	},
+
+	calculateTotal: function() {
+		var dataset = this.getDataset();
+		var meta = this.getMeta();
+		var total = 0;
+		var value;
+
+		helpers.each(meta.data, function(element, index) {
+			value = dataset.data[index];
+			if (!isNaN(value) && !element.hidden) {
+				total += Math.abs(value);
+			}
+		});
+
+		/* if (total === 0) {
+			total = NaN;
+		}*/
+
+		return total;
+	},
+
+	calculateCircumference: function(value) {
+		var total = this.getMeta().total;
+		if (total > 0 && !isNaN(value)) {
+			return DOUBLE_PI * (Math.abs(value) / total);
+		}
+		return 0;
+	},
+
+	// gets the max border or hover width to properly scale pie charts
+	getMaxBorderWidth: function(arcs) {
+		var me = this;
+		var max = 0;
+		var chart = me.chart;
+		var i, ilen, meta, arc, controller, options, borderWidth, hoverWidth;
+
+		if (!arcs) {
+			// Find the outmost visible dataset
+			for (i = 0, ilen = chart.data.datasets.length; i < ilen; ++i) {
+				if (chart.isDatasetVisible(i)) {
+					meta = chart.getDatasetMeta(i);
+					arcs = meta.data;
+					if (i !== me.index) {
+						controller = meta.controller;
+					}
+					break;
+				}
+			}
+		}
+
+		if (!arcs) {
+			return 0;
+		}
+
+		for (i = 0, ilen = arcs.length; i < ilen; ++i) {
+			arc = arcs[i];
+			if (controller) {
+				controller._configure();
+				options = controller._resolveDataElementOptions(arc, i);
+			} else {
+				options = arc._options;
+			}
+			if (options.borderAlign !== 'inner') {
+				borderWidth = options.borderWidth;
+				hoverWidth = options.hoverBorderWidth;
+
+				max = borderWidth > max ? borderWidth : max;
+				max = hoverWidth > max ? hoverWidth : max;
+			}
+		}
+		return max;
+	},
+
+	/**
+	 * @protected
+	 */
+	setHoverStyle: function(arc) {
+		var model = arc._model;
+		var options = arc._options;
+		var getHoverColor = helpers.getHoverColor;
+
+		arc.$previousStyle = {
+			backgroundColor: model.backgroundColor,
+			borderColor: model.borderColor,
+			borderWidth: model.borderWidth,
+		};
+
+		model.backgroundColor = valueOrDefault(options.hoverBackgroundColor, getHoverColor(options.backgroundColor));
+		model.borderColor = valueOrDefault(options.hoverBorderColor, getHoverColor(options.borderColor));
+		model.borderWidth = valueOrDefault(options.hoverBorderWidth, options.borderWidth);
+	},
+
+	/**
+	 * Get radius length offset of the dataset in relation to the visible datasets weights. This allows determining the inner and outer radius correctly
+	 * @private
+	 */
+	_getRingWeightOffset: function(datasetIndex) {
+		var ringWeightOffset = 0;
+
+		for (var i = 0; i < datasetIndex; ++i) {
+			if (this.chart.isDatasetVisible(i)) {
+				ringWeightOffset += this._getRingWeight(i);
+			}
+		}
+
+		return ringWeightOffset;
+	},
+
+	/**
+	 * @private
+	 */
+	_getRingWeight: function(dataSetIndex) {
+		return Math.max(valueOrDefault(this.chart.data.datasets[dataSetIndex].weight, 1), 0);
+	},
+
+	/**
+	 * Returns the sum of all visibile data set weights.  This value can be 0.
+	 * @private
+	 */
+	_getVisibleDatasetWeightTotal: function() {
+		return this._getRingWeightOffset(this.chart.data.datasets.length);
+	}
+});

assets/chart/src/controllers/controller.horizontalBar.js

@@ -0,0 +1,63 @@
+'use strict';
+
+var BarController = require('./controller.bar');
+var defaults = require('../core/core.defaults');
+
+defaults._set('horizontalBar', {
+	hover: {
+		mode: 'index',
+		axis: 'y'
+	},
+
+	scales: {
+		xAxes: [{
+			type: 'linear',
+			position: 'bottom'
+		}],
+
+		yAxes: [{
+			type: 'category',
+			position: 'left',
+			offset: true,
+			gridLines: {
+				offsetGridLines: true
+			}
+		}]
+	},
+
+	elements: {
+		rectangle: {
+			borderSkipped: 'left'
+		}
+	},
+
+	tooltips: {
+		mode: 'index',
+		axis: 'y'
+	}
+});
+
+defaults._set('global', {
+	datasets: {
+		horizontalBar: {
+			categoryPercentage: 0.8,
+			barPercentage: 0.9
+		}
+	}
+});
+
+module.exports = BarController.extend({
+	/**
+	 * @private
+	 */
+	_getValueScaleId: function() {
+		return this.getMeta().xAxisID;
+	},
+
+	/**
+	 * @private
+	 */
+	_getIndexScaleId: function() {
+		return this.getMeta().yAxisID;
+	}
+});

assets/chart/src/controllers/controller.line.js

@@ -0,0 +1,371 @@
+'use strict';
+
+var DatasetController = require('../core/core.datasetController');
+var defaults = require('../core/core.defaults');
+var elements = require('../elements/index');
+var helpers = require('../helpers/index');
+
+var valueOrDefault = helpers.valueOrDefault;
+var resolve = helpers.options.resolve;
+var isPointInArea = helpers.canvas._isPointInArea;
+
+defaults._set('line', {
+	showLines: true,
+	spanGaps: false,
+
+	hover: {
+		mode: 'label'
+	},
+
+	scales: {
+		xAxes: [{
+			type: 'category',
+			id: 'x-axis-0'
+		}],
+		yAxes: [{
+			type: 'linear',
+			id: 'y-axis-0'
+		}]
+	}
+});
+
+function scaleClip(scale, halfBorderWidth) {
+	var tickOpts = scale && scale.options.ticks || {};
+	var reverse = tickOpts.reverse;
+	var min = tickOpts.min === undefined ? halfBorderWidth : 0;
+	var max = tickOpts.max === undefined ? halfBorderWidth : 0;
+	return {
+		start: reverse ? max : min,
+		end: reverse ? min : max
+	};
+}
+
+function defaultClip(xScale, yScale, borderWidth) {
+	var halfBorderWidth = borderWidth / 2;
+	var x = scaleClip(xScale, halfBorderWidth);
+	var y = scaleClip(yScale, halfBorderWidth);
+
+	return {
+		top: y.end,
+		right: x.end,
+		bottom: y.start,
+		left: x.start
+	};
+}
+
+function toClip(value) {
+	var t, r, b, l;
+
+	if (helpers.isObject(value)) {
+		t = value.top;
+		r = value.right;
+		b = value.bottom;
+		l = value.left;
+	} else {
+		t = r = b = l = value;
+	}
+
+	return {
+		top: t,
+		right: r,
+		bottom: b,
+		left: l
+	};
+}
+
+
+module.exports = DatasetController.extend({
+
+	datasetElementType: elements.Line,
+
+	dataElementType: elements.Point,
+
+	/**
+	 * @private
+	 */
+	_datasetElementOptions: [
+		'backgroundColor',
+		'borderCapStyle',
+		'borderColor',
+		'borderDash',
+		'borderDashOffset',
+		'borderJoinStyle',
+		'borderWidth',
+		'cubicInterpolationMode',
+		'fill'
+	],
+
+	/**
+	 * @private
+	 */
+	_dataElementOptions: {
+		backgroundColor: 'pointBackgroundColor',
+		borderColor: 'pointBorderColor',
+		borderWidth: 'pointBorderWidth',
+		hitRadius: 'pointHitRadius',
+		hoverBackgroundColor: 'pointHoverBackgroundColor',
+		hoverBorderColor: 'pointHoverBorderColor',
+		hoverBorderWidth: 'pointHoverBorderWidth',
+		hoverRadius: 'pointHoverRadius',
+		pointStyle: 'pointStyle',
+		radius: 'pointRadius',
+		rotation: 'pointRotation'
+	},
+
+	update: function(reset) {
+		var me = this;
+		var meta = me.getMeta();
+		var line = meta.dataset;
+		var points = meta.data || [];
+		var options = me.chart.options;
+		var config = me._config;
+		var showLine = me._showLine = valueOrDefault(config.showLine, options.showLines);
+		var i, ilen;
+
+		me._xScale = me.getScaleForId(meta.xAxisID);
+		me._yScale = me.getScaleForId(meta.yAxisID);
+
+		// Update Line
+		if (showLine) {
+			// Compatibility: If the properties are defined with only the old name, use those values
+			if (config.tension !== undefined && config.lineTension === undefined) {
+				config.lineTension = config.tension;
+			}
+
+			// Utility
+			line._scale = me._yScale;
+			line._datasetIndex = me.index;
+			// Data
+			line._children = points;
+			// Model
+			line._model = me._resolveDatasetElementOptions(line);
+
+			line.pivot();
+		}
+
+		// Update Points
+		for (i = 0, ilen = points.length; i < ilen; ++i) {
+			me.updateElement(points[i], i, reset);
+		}
+
+		if (showLine && line._model.tension !== 0) {
+			me.updateBezierControlPoints();
+		}
+
+		// Now pivot the point for animation
+		for (i = 0, ilen = points.length; i < ilen; ++i) {
+			points[i].pivot();
+		}
+	},
+
+	updateElement: function(point, index, reset) {
+		var me = this;
+		var meta = me.getMeta();
+		var custom = point.custom || {};
+		var dataset = me.getDataset();
+		var datasetIndex = me.index;
+		var value = dataset.data[index];
+		var xScale = me._xScale;
+		var yScale = me._yScale;
+		var lineModel = meta.dataset._model;
+		var x, y;
+
+		var options = me._resolveDataElementOptions(point, index);
+
+		x = xScale.getPixelForValue(typeof value === 'object' ? value : NaN, index, datasetIndex);
+		y = reset ? yScale.getBasePixel() : me.calculatePointY(value, index, datasetIndex);
+
+		// Utility
+		point._xScale = xScale;
+		point._yScale = yScale;
+		point._options = options;
+		point._datasetIndex = datasetIndex;
+		point._index = index;
+
+		// Desired view properties
+		point._model = {
+			x: x,
+			y: y,
+			skip: custom.skip || isNaN(x) || isNaN(y),
+			// Appearance
+			radius: options.radius,
+			pointStyle: options.pointStyle,
+			rotation: options.rotation,
+			backgroundColor: options.backgroundColor,
+			borderColor: options.borderColor,
+			borderWidth: options.borderWidth,
+			tension: valueOrDefault(custom.tension, lineModel ? lineModel.tension : 0),
+			steppedLine: lineModel ? lineModel.steppedLine : false,
+			// Tooltip
+			hitRadius: options.hitRadius
+		};
+	},
+
+	/**
+	 * @private
+	 */
+	_resolveDatasetElementOptions: function(element) {
+		var me = this;
+		var config = me._config;
+		var custom = element.custom || {};
+		var options = me.chart.options;
+		var lineOptions = options.elements.line;
+		var values = DatasetController.prototype._resolveDatasetElementOptions.apply(me, arguments);
+
+		// The default behavior of lines is to break at null values, according
+		// to https://github.com/chartjs/Chart.js/issues/2435#issuecomment-216718158
+		// This option gives lines the ability to span gaps
+		values.spanGaps = valueOrDefault(config.spanGaps, options.spanGaps);
+		values.tension = valueOrDefault(config.lineTension, lineOptions.tension);
+		values.steppedLine = resolve([custom.steppedLine, config.steppedLine, lineOptions.stepped]);
+		values.clip = toClip(valueOrDefault(config.clip, defaultClip(me._xScale, me._yScale, values.borderWidth)));
+
+		return values;
+	},
+
+	calculatePointY: function(value, index, datasetIndex) {
+		var me = this;
+		var chart = me.chart;
+		var yScale = me._yScale;
+		var sumPos = 0;
+		var sumNeg = 0;
+		var i, ds, dsMeta, stackedRightValue, rightValue, metasets, ilen;
+
+		if (yScale.options.stacked) {
+			rightValue = +yScale.getRightValue(value);
+			metasets = chart._getSortedVisibleDatasetMetas();
+			ilen = metasets.length;
+
+			for (i = 0; i < ilen; ++i) {
+				dsMeta = metasets[i];
+				if (dsMeta.index === datasetIndex) {
+					break;
+				}
+
+				ds = chart.data.datasets[dsMeta.index];
+				if (dsMeta.type === 'line' && dsMeta.yAxisID === yScale.id) {
+					stackedRightValue = +yScale.getRightValue(ds.data[index]);
+					if (stackedRightValue < 0) {
+						sumNeg += stackedRightValue || 0;
+					} else {
+						sumPos += stackedRightValue || 0;
+					}
+				}
+			}
+
+			if (rightValue < 0) {
+				return yScale.getPixelForValue(sumNeg + rightValue);
+			}
+			return yScale.getPixelForValue(sumPos + rightValue);
+		}
+		return yScale.getPixelForValue(value);
+	},
+
+	updateBezierControlPoints: function() {
+		var me = this;
+		var chart = me.chart;
+		var meta = me.getMeta();
+		var lineModel = meta.dataset._model;
+		var area = chart.chartArea;
+		var points = meta.data || [];
+		var i, ilen, model, controlPoints;
+
+		// Only consider points that are drawn in case the spanGaps option is used
+		if (lineModel.spanGaps) {
+			points = points.filter(function(pt) {
+				return !pt._model.skip;
+			});
+		}
+
+		function capControlPoint(pt, min, max) {
+			return Math.max(Math.min(pt, max), min);
+		}
+
+		if (lineModel.cubicInterpolationMode === 'monotone') {
+			helpers.splineCurveMonotone(points);
+		} else {
+			for (i = 0, ilen = points.length; i < ilen; ++i) {
+				model = points[i]._model;
+				controlPoints = helpers.splineCurve(
+					helpers.previousItem(points, i)._model,
+					model,
+					helpers.nextItem(points, i)._model,
+					lineModel.tension
+				);
+				model.controlPointPreviousX = controlPoints.previous.x;
+				model.controlPointPreviousY = controlPoints.previous.y;
+				model.controlPointNextX = controlPoints.next.x;
+				model.controlPointNextY = controlPoints.next.y;
+			}
+		}
+
+		if (chart.options.elements.line.capBezierPoints) {
+			for (i = 0, ilen = points.length; i < ilen; ++i) {
+				model = points[i]._model;
+				if (isPointInArea(model, area)) {
+					if (i > 0 && isPointInArea(points[i - 1]._model, area)) {
+						model.controlPointPreviousX = capControlPoint(model.controlPointPreviousX, area.left, area.right);
+						model.controlPointPreviousY = capControlPoint(model.controlPointPreviousY, area.top, area.bottom);
+					}
+					if (i < points.length - 1 && isPointInArea(points[i + 1]._model, area)) {
+						model.controlPointNextX = capControlPoint(model.controlPointNextX, area.left, area.right);
+						model.controlPointNextY = capControlPoint(model.controlPointNextY, area.top, area.bottom);
+					}
+				}
+			}
+		}
+	},
+
+	draw: function() {
+		var me = this;
+		var chart = me.chart;
+		var meta = me.getMeta();
+		var points = meta.data || [];
+		var area = chart.chartArea;
+		var canvas = chart.canvas;
+		var i = 0;
+		var ilen = points.length;
+		var clip;
+
+		if (me._showLine) {
+			clip = meta.dataset._model.clip;
+
+			helpers.canvas.clipArea(chart.ctx, {
+				left: clip.left === false ? 0 : area.left - clip.left,
+				right: clip.right === false ? canvas.width : area.right + clip.right,
+				top: clip.top === false ? 0 : area.top - clip.top,
+				bottom: clip.bottom === false ? canvas.height : area.bottom + clip.bottom
+			});
+
+			meta.dataset.draw();
+
+			helpers.canvas.unclipArea(chart.ctx);
+		}
+
+		// Draw the points
+		for (; i < ilen; ++i) {
+			points[i].draw(area);
+		}
+	},
+
+	/**
+	 * @protected
+	 */
+	setHoverStyle: function(point) {
+		var model = point._model;
+		var options = point._options;
+		var getHoverColor = helpers.getHoverColor;
+
+		point.$previousStyle = {
+			backgroundColor: model.backgroundColor,
+			borderColor: model.borderColor,
+			borderWidth: model.borderWidth,
+			radius: model.radius
+		};
+
+		model.backgroundColor = valueOrDefault(options.hoverBackgroundColor, getHoverColor(options.backgroundColor));
+		model.borderColor = valueOrDefault(options.hoverBorderColor, getHoverColor(options.borderColor));
+		model.borderWidth = valueOrDefault(options.hoverBorderWidth, options.borderWidth);
+		model.radius = valueOrDefault(options.hoverRadius, options.radius);
+	},
+});

assets/chart/src/controllers/controller.pie.js

@@ -0,0 +1,13 @@
+'use strict';
+
+var DoughnutController = require('./controller.doughnut');
+var defaults = require('../core/core.defaults');
+var helpers = require('../helpers/index');
+
+defaults._set('pie', helpers.clone(defaults.doughnut));
+defaults._set('pie', {
+	cutoutPercentage: 0
+});
+
+// Pie charts are Doughnut chart with different defaults
+module.exports = DoughnutController;

assets/chart/src/controllers/controller.polarArea.js

@@ -0,0 +1,291 @@
+'use strict';
+
+var DatasetController = require('../core/core.datasetController');
+var defaults = require('../core/core.defaults');
+var elements = require('../elements/index');
+var helpers = require('../helpers/index');
+
+var resolve = helpers.options.resolve;
+
+defaults._set('polarArea', {
+	scale: {
+		type: 'radialLinear',
+		angleLines: {
+			display: false
+		},
+		gridLines: {
+			circular: true
+		},
+		pointLabels: {
+			display: false
+		},
+		ticks: {
+			beginAtZero: true
+		}
+	},
+
+	// Boolean - Whether to animate the rotation of the chart
+	animation: {
+		animateRotate: true,
+		animateScale: true
+	},
+
+	startAngle: -0.5 * Math.PI,
+	legendCallback: function(chart) {
+		var list = document.createElement('ul');
+		var data = chart.data;
+		var datasets = data.datasets;
+		var labels = data.labels;
+		var i, ilen, listItem, listItemSpan;
+
+		list.setAttribute('class', chart.id + '-legend');
+		if (datasets.length) {
+			for (i = 0, ilen = datasets[0].data.length; i < ilen; ++i) {
+				listItem = list.appendChild(document.createElement('li'));
+				listItemSpan = listItem.appendChild(document.createElement('span'));
+				listItemSpan.style.backgroundColor = datasets[0].backgroundColor[i];
+				if (labels[i]) {
+					listItem.appendChild(document.createTextNode(labels[i]));
+				}
+			}
+		}
+
+		return list.outerHTML;
+	},
+	legend: {
+		labels: {
+			generateLabels: function(chart) {
+				var data = chart.data;
+				if (data.labels.length && data.datasets.length) {
+					return data.labels.map(function(label, i) {
+						var meta = chart.getDatasetMeta(0);
+						var style = meta.controller.getStyle(i);
+
+						return {
+							text: label,
+							fillStyle: style.backgroundColor,
+							strokeStyle: style.borderColor,
+							lineWidth: style.borderWidth,
+							hidden: isNaN(data.datasets[0].data[i]) || meta.data[i].hidden,
+
+							// Extra data used for toggling the correct item
+							index: i
+						};
+					});
+				}
+				return [];
+			}
+		},
+
+		onClick: function(e, legendItem) {
+			var index = legendItem.index;
+			var chart = this.chart;
+			var i, ilen, meta;
+
+			for (i = 0, ilen = (chart.data.datasets || []).length; i < ilen; ++i) {
+				meta = chart.getDatasetMeta(i);
+				meta.data[index].hidden = !meta.data[index].hidden;
+			}
+
+			chart.update();
+		}
+	},
+
+	// Need to override these to give a nice default
+	tooltips: {
+		callbacks: {
+			title: function() {
+				return '';
+			},
+			label: function(item, data) {
+				return data.labels[item.index] + ': ' + item.yLabel;
+			}
+		}
+	}
+});
+
+module.exports = DatasetController.extend({
+
+	dataElementType: elements.Arc,
+
+	linkScales: helpers.noop,
+
+	/**
+	 * @private
+	 */
+	_dataElementOptions: [
+		'backgroundColor',
+		'borderColor',
+		'borderWidth',
+		'borderAlign',
+		'hoverBackgroundColor',
+		'hoverBorderColor',
+		'hoverBorderWidth',
+	],
+
+	/**
+	 * @private
+	 */
+	_getIndexScaleId: function() {
+		return this.chart.scale.id;
+	},
+
+	/**
+	 * @private
+	 */
+	_getValueScaleId: function() {
+		return this.chart.scale.id;
+	},
+
+	update: function(reset) {
+		var me = this;
+		var dataset = me.getDataset();
+		var meta = me.getMeta();
+		var start = me.chart.options.startAngle || 0;
+		var starts = me._starts = [];
+		var angles = me._angles = [];
+		var arcs = meta.data;
+		var i, ilen, angle;
+
+		me._updateRadius();
+
+		meta.count = me.countVisibleElements();
+
+		for (i = 0, ilen = dataset.data.length; i < ilen; i++) {
+			starts[i] = start;
+			angle = me._computeAngle(i);
+			angles[i] = angle;
+			start += angle;
+		}
+
+		for (i = 0, ilen = arcs.length; i < ilen; ++i) {
+			arcs[i]._options = me._resolveDataElementOptions(arcs[i], i);
+			me.updateElement(arcs[i], i, reset);
+		}
+	},
+
+	/**
+	 * @private
+	 */
+	_updateRadius: function() {
+		var me = this;
+		var chart = me.chart;
+		var chartArea = chart.chartArea;
+		var opts = chart.options;
+		var minSize = Math.min(chartArea.right - chartArea.left, chartArea.bottom - chartArea.top);
+
+		chart.outerRadius = Math.max(minSize / 2, 0);
+		chart.innerRadius = Math.max(opts.cutoutPercentage ? (chart.outerRadius / 100) * (opts.cutoutPercentage) : 1, 0);
+		chart.radiusLength = (chart.outerRadius - chart.innerRadius) / chart.getVisibleDatasetCount();
+
+		me.outerRadius = chart.outerRadius - (chart.radiusLength * me.index);
+		me.innerRadius = me.outerRadius - chart.radiusLength;
+	},
+
+	updateElement: function(arc, index, reset) {
+		var me = this;
+		var chart = me.chart;
+		var dataset = me.getDataset();
+		var opts = chart.options;
+		var animationOpts = opts.animation;
+		var scale = chart.scale;
+		var labels = chart.data.labels;
+
+		var centerX = scale.xCenter;
+		var centerY = scale.yCenter;
+
+		// var negHalfPI = -0.5 * Math.PI;
+		var datasetStartAngle = opts.startAngle;
+		var distance = arc.hidden ? 0 : scale.getDistanceFromCenterForValue(dataset.data[index]);
+		var startAngle = me._starts[index];
+		var endAngle = startAngle + (arc.hidden ? 0 : me._angles[index]);
+
+		var resetRadius = animationOpts.animateScale ? 0 : scale.getDistanceFromCenterForValue(dataset.data[index]);
+		var options = arc._options || {};
+
+		helpers.extend(arc, {
+			// Utility
+			_datasetIndex: me.index,
+			_index: index,
+			_scale: scale,
+
+			// Desired view properties
+			_model: {
+				backgroundColor: options.backgroundColor,
+				borderColor: options.borderColor,
+				borderWidth: options.borderWidth,
+				borderAlign: options.borderAlign,
+				x: centerX,
+				y: centerY,
+				innerRadius: 0,
+				outerRadius: reset ? resetRadius : distance,
+				startAngle: reset && animationOpts.animateRotate ? datasetStartAngle : startAngle,
+				endAngle: reset && animationOpts.animateRotate ? datasetStartAngle : endAngle,
+				label: helpers.valueAtIndexOrDefault(labels, index, labels[index])
+			}
+		});
+
+		arc.pivot();
+	},
+
+	countVisibleElements: function() {
+		var dataset = this.getDataset();
+		var meta = this.getMeta();
+		var count = 0;
+
+		helpers.each(meta.data, function(element, index) {
+			if (!isNaN(dataset.data[index]) && !element.hidden) {
+				count++;
+			}
+		});
+
+		return count;
+	},
+
+	/**
+	 * @protected
+	 */
+	setHoverStyle: function(arc) {
+		var model = arc._model;
+		var options = arc._options;
+		var getHoverColor = helpers.getHoverColor;
+		var valueOrDefault = helpers.valueOrDefault;
+
+		arc.$previousStyle = {
+			backgroundColor: model.backgroundColor,
+			borderColor: model.borderColor,
+			borderWidth: model.borderWidth,
+		};
+
+		model.backgroundColor = valueOrDefault(options.hoverBackgroundColor, getHoverColor(options.backgroundColor));
+		model.borderColor = valueOrDefault(options.hoverBorderColor, getHoverColor(options.borderColor));
+		model.borderWidth = valueOrDefault(options.hoverBorderWidth, options.borderWidth);
+	},
+
+	/**
+	 * @private
+	 */
+	_computeAngle: function(index) {
+		var me = this;
+		var count = this.getMeta().count;
+		var dataset = me.getDataset();
+		var meta = me.getMeta();
+
+		if (isNaN(dataset.data[index]) || meta.data[index].hidden) {
+			return 0;
+		}
+
+		// Scriptable options
+		var context = {
+			chart: me.chart,
+			dataIndex: index,
+			dataset: dataset,
+			datasetIndex: me.index
+		};
+
+		return resolve([
+			me.chart.options.elements.arc.angle,
+			(2 * Math.PI) / count
+		], context, index);
+	}
+});

assets/chart/src/controllers/controller.radar.js

@@ -0,0 +1,217 @@
+'use strict';
+
+var DatasetController = require('../core/core.datasetController');
+var defaults = require('../core/core.defaults');
+var elements = require('../elements/index');
+var helpers = require('../helpers/index');
+
+var valueOrDefault = helpers.valueOrDefault;
+
+defaults._set('radar', {
+	spanGaps: false,
+	scale: {
+		type: 'radialLinear'
+	},
+	elements: {
+		line: {
+			fill: 'start',
+			tension: 0 // no bezier in radar
+		}
+	}
+});
+
+module.exports = DatasetController.extend({
+	datasetElementType: elements.Line,
+
+	dataElementType: elements.Point,
+
+	linkScales: helpers.noop,
+
+	/**
+	 * @private
+	 */
+	_datasetElementOptions: [
+		'backgroundColor',
+		'borderWidth',
+		'borderColor',
+		'borderCapStyle',
+		'borderDash',
+		'borderDashOffset',
+		'borderJoinStyle',
+		'fill'
+	],
+
+	/**
+	 * @private
+	 */
+	_dataElementOptions: {
+		backgroundColor: 'pointBackgroundColor',
+		borderColor: 'pointBorderColor',
+		borderWidth: 'pointBorderWidth',
+		hitRadius: 'pointHitRadius',
+		hoverBackgroundColor: 'pointHoverBackgroundColor',
+		hoverBorderColor: 'pointHoverBorderColor',
+		hoverBorderWidth: 'pointHoverBorderWidth',
+		hoverRadius: 'pointHoverRadius',
+		pointStyle: 'pointStyle',
+		radius: 'pointRadius',
+		rotation: 'pointRotation'
+	},
+
+	/**
+	 * @private
+	 */
+	_getIndexScaleId: function() {
+		return this.chart.scale.id;
+	},
+
+	/**
+	 * @private
+	 */
+	_getValueScaleId: function() {
+		return this.chart.scale.id;
+	},
+
+	update: function(reset) {
+		var me = this;
+		var meta = me.getMeta();
+		var line = meta.dataset;
+		var points = meta.data || [];
+		var scale = me.chart.scale;
+		var config = me._config;
+		var i, ilen;
+
+		// Compatibility: If the properties are defined with only the old name, use those values
+		if (config.tension !== undefined && config.lineTension === undefined) {
+			config.lineTension = config.tension;
+		}
+
+		// Utility
+		line._scale = scale;
+		line._datasetIndex = me.index;
+		// Data
+		line._children = points;
+		line._loop = true;
+		// Model
+		line._model = me._resolveDatasetElementOptions(line);
+
+		line.pivot();
+
+		// Update Points
+		for (i = 0, ilen = points.length; i < ilen; ++i) {
+			me.updateElement(points[i], i, reset);
+		}
+
+		// Update bezier control points
+		me.updateBezierControlPoints();
+
+		// Now pivot the point for animation
+		for (i = 0, ilen = points.length; i < ilen; ++i) {
+			points[i].pivot();
+		}
+	},
+
+	updateElement: function(point, index, reset) {
+		var me = this;
+		var custom = point.custom || {};
+		var dataset = me.getDataset();
+		var scale = me.chart.scale;
+		var pointPosition = scale.getPointPositionForValue(index, dataset.data[index]);
+		var options = me._resolveDataElementOptions(point, index);
+		var lineModel = me.getMeta().dataset._model;
+		var x = reset ? scale.xCenter : pointPosition.x;
+		var y = reset ? scale.yCenter : pointPosition.y;
+
+		// Utility
+		point._scale = scale;
+		point._options = options;
+		point._datasetIndex = me.index;
+		point._index = index;
+
+		// Desired view properties
+		point._model = {
+			x: x, // value not used in dataset scale, but we want a consistent API between scales
+			y: y,
+			skip: custom.skip || isNaN(x) || isNaN(y),
+			// Appearance
+			radius: options.radius,
+			pointStyle: options.pointStyle,
+			rotation: options.rotation,
+			backgroundColor: options.backgroundColor,
+			borderColor: options.borderColor,
+			borderWidth: options.borderWidth,
+			tension: valueOrDefault(custom.tension, lineModel ? lineModel.tension : 0),
+
+			// Tooltip
+			hitRadius: options.hitRadius
+		};
+	},
+
+	/**
+	 * @private
+	 */
+	_resolveDatasetElementOptions: function() {
+		var me = this;
+		var config = me._config;
+		var options = me.chart.options;
+		var values = DatasetController.prototype._resolveDatasetElementOptions.apply(me, arguments);
+
+		values.spanGaps = valueOrDefault(config.spanGaps, options.spanGaps);
+		values.tension = valueOrDefault(config.lineTension, options.elements.line.tension);
+
+		return values;
+	},
+
+	updateBezierControlPoints: function() {
+		var me = this;
+		var meta = me.getMeta();
+		var area = me.chart.chartArea;
+		var points = meta.data || [];
+		var i, ilen, model, controlPoints;
+
+		// Only consider points that are drawn in case the spanGaps option is used
+		if (meta.dataset._model.spanGaps) {
+			points = points.filter(function(pt) {
+				return !pt._model.skip;
+			});
+		}
+
+		function capControlPoint(pt, min, max) {
+			return Math.max(Math.min(pt, max), min);
+		}
+
+		for (i = 0, ilen = points.length; i < ilen; ++i) {
+			model = points[i]._model;
+			controlPoints = helpers.splineCurve(
+				helpers.previousItem(points, i, true)._model,
+				model,
+				helpers.nextItem(points, i, true)._model,
+				model.tension
+			);
+
+			// Prevent the bezier going outside of the bounds of the graph
+			model.controlPointPreviousX = capControlPoint(controlPoints.previous.x, area.left, area.right);
+			model.controlPointPreviousY = capControlPoint(controlPoints.previous.y, area.top, area.bottom);
+			model.controlPointNextX = capControlPoint(controlPoints.next.x, area.left, area.right);
+			model.controlPointNextY = capControlPoint(controlPoints.next.y, area.top, area.bottom);
+		}
+	},
+
+	setHoverStyle: function(point) {
+		var model = point._model;
+		var options = point._options;
+		var getHoverColor = helpers.getHoverColor;
+
+		point.$previousStyle = {
+			backgroundColor: model.backgroundColor,
+			borderColor: model.borderColor,
+			borderWidth: model.borderWidth,
+			radius: model.radius
+		};
+
+		model.backgroundColor = valueOrDefault(options.hoverBackgroundColor, getHoverColor(options.backgroundColor));
+		model.borderColor = valueOrDefault(options.hoverBorderColor, getHoverColor(options.borderColor));
+		model.borderWidth = valueOrDefault(options.hoverBorderWidth, options.borderWidth);
+		model.radius = valueOrDefault(options.hoverRadius, options.radius);
+	}
+});

assets/chart/src/controllers/controller.scatter.js

@@ -0,0 +1,45 @@
+'use strict';
+
+var LineController = require('./controller.line');
+var defaults = require('../core/core.defaults');
+
+defaults._set('scatter', {
+	hover: {
+		mode: 'single'
+	},
+
+	scales: {
+		xAxes: [{
+			id: 'x-axis-1',    // need an ID so datasets can reference the scale
+			type: 'linear',    // scatter should not use a category axis
+			position: 'bottom'
+		}],
+		yAxes: [{
+			id: 'y-axis-1',
+			type: 'linear',
+			position: 'left'
+		}]
+	},
+
+	tooltips: {
+		callbacks: {
+			title: function() {
+				return '';     // doesn't make sense for scatter since data are formatted as a point
+			},
+			label: function(item) {
+				return '(' + item.xLabel + ', ' + item.yLabel + ')';
+			}
+		}
+	}
+});
+
+defaults._set('global', {
+	datasets: {
+		scatter: {
+			showLine: false
+		}
+	}
+});
+
+// Scatter charts use line controllers
+module.exports = LineController;

assets/chart/src/controllers/index.js

@@ -0,0 +1,27 @@
+'use strict';
+
+var bar = require('./controller.bar');
+var bubble = require('./controller.bubble');
+var doughnut = require('./controller.doughnut');
+var horizontalBar = require('./controller.horizontalBar');
+var line = require('./controller.line');
+var polarArea = require('./controller.polarArea');
+var pie = require('./controller.pie');
+var radar = require('./controller.radar');
+var scatter = require('./controller.scatter');
+
+// NOTE export a map in which the key represents the controller type, not
+// the class, and so must be CamelCase in order to be correctly retrieved
+// by the controller in core.controller.js (`controllers[meta.type]`).
+
+module.exports = {
+	bar: bar,
+	bubble: bubble,
+	doughnut: doughnut,
+	horizontalBar: horizontalBar,
+	line: line,
+	polarArea: polarArea,
+	pie: pie,
+	radar: radar,
+	scatter: scatter
+};

assets/chart/src/core/core.adapters.js

@@ -0,0 +1,121 @@
+/**
+ * @namespace Chart._adapters
+ * @since 2.8.0
+ * @private
+ */
+
+'use strict';
+
+var helpers = require('../helpers/index');
+
+function abstract() {
+	throw new Error(
+		'This method is not implemented: either no adapter can ' +
+		'be found or an incomplete integration was provided.'
+	);
+}
+
+/**
+ * Date adapter (current used by the time scale)
+ * @namespace Chart._adapters._date
+ * @memberof Chart._adapters
+ * @private
+ */
+
+/**
+ * Currently supported unit string values.
+ * @typedef {('millisecond'|'second'|'minute'|'hour'|'day'|'week'|'month'|'quarter'|'year')}
+ * @memberof Chart._adapters._date
+ * @name Unit
+ */
+
+/**
+ * @class
+ */
+function DateAdapter(options) {
+	this.options = options || {};
+}
+
+helpers.extend(DateAdapter.prototype, /** @lends DateAdapter */ {
+	/**
+	 * Returns a map of time formats for the supported formatting units defined
+	 * in Unit as well as 'datetime' representing a detailed date/time string.
+	 * @returns {{string: string}}
+	 */
+	formats: abstract,
+
+	/**
+	 * Parses the given `value` and return the associated timestamp.
+	 * @param {any} value - the value to parse (usually comes from the data)
+	 * @param {string} [format] - the expected data format
+	 * @returns {(number|null)}
+	 * @function
+	 */
+	parse: abstract,
+
+	/**
+	 * Returns the formatted date in the specified `format` for a given `timestamp`.
+	 * @param {number} timestamp - the timestamp to format
+	 * @param {string} format - the date/time token
+	 * @return {string}
+	 * @function
+	 */
+	format: abstract,
+
+	/**
+	 * Adds the specified `amount` of `unit` to the given `timestamp`.
+	 * @param {number} timestamp - the input timestamp
+	 * @param {number} amount - the amount to add
+	 * @param {Unit} unit - the unit as string
+	 * @return {number}
+	 * @function
+	 */
+	add: abstract,
+
+	/**
+	 * Returns the number of `unit` between the given timestamps.
+	 * @param {number} max - the input timestamp (reference)
+	 * @param {number} min - the timestamp to substract
+	 * @param {Unit} unit - the unit as string
+	 * @return {number}
+	 * @function
+	 */
+	diff: abstract,
+
+	/**
+	 * Returns start of `unit` for the given `timestamp`.
+	 * @param {number} timestamp - the input timestamp
+	 * @param {Unit} unit - the unit as string
+	 * @param {number} [weekday] - the ISO day of the week with 1 being Monday
+	 * and 7 being Sunday (only needed if param *unit* is `isoWeek`).
+	 * @function
+	 */
+	startOf: abstract,
+
+	/**
+	 * Returns end of `unit` for the given `timestamp`.
+	 * @param {number} timestamp - the input timestamp
+	 * @param {Unit} unit - the unit as string
+	 * @function
+	 */
+	endOf: abstract,
+
+	// DEPRECATIONS
+
+	/**
+	 * Provided for backward compatibility for scale.getValueForPixel(),
+	 * this method should be overridden only by the moment adapter.
+	 * @deprecated since version 2.8.0
+	 * @todo remove at version 3
+	 * @private
+	 */
+	_create: function(value) {
+		return value;
+	}
+});
+
+DateAdapter.override = function(members) {
+	helpers.extend(DateAdapter.prototype, members);
+};
+
+module.exports._date = DateAdapter;

assets/chart/src/core/core.animation.js

@@ -0,0 +1,45 @@
+'use strict';
+
+var Element = require('./core.element');
+
+var exports = Element.extend({
+	chart: null, // the animation associated chart instance
+	currentStep: 0, // the current animation step
+	numSteps: 60, // default number of steps
+	easing: '', // the easing to use for this animation
+	render: null, // render function used by the animation service
+
+	onAnimationProgress: null, // user specified callback to fire on each step of the animation
+	onAnimationComplete: null, // user specified callback to fire when the animation finishes
+});
+
+module.exports = exports;
+
+// DEPRECATIONS
+
+/**
+ * Provided for backward compatibility, use Chart.Animation instead
+ * @prop Chart.Animation#animationObject
+ * @deprecated since version 2.6.0
+ * @todo remove at version 3
+ */
+Object.defineProperty(exports.prototype, 'animationObject', {
+	get: function() {
+		return this;
+	}
+});
+
+/**
+ * Provided for backward compatibility, use Chart.Animation#chart instead
+ * @prop Chart.Animation#chartInstance
+ * @deprecated since version 2.6.0
+ * @todo remove at version 3
+ */
+Object.defineProperty(exports.prototype, 'chartInstance', {
+	get: function() {
+		return this.chart;
+	},
+	set: function(value) {
+		this.chart = value;
+	}
+});

assets/chart/src/core/core.animations.js

@@ -0,0 +1,122 @@
+/* global window: false */
+'use strict';
+
+var defaults = require('./core.defaults');
+var helpers = require('../helpers/index');
+
+defaults._set('global', {
+	animation: {
+		duration: 1000,
+		easing: 'easeOutQuart',
+		onProgress: helpers.noop,
+		onComplete: helpers.noop
+	}
+});
+
+module.exports = {
+	animations: [],
+	request: null,
+
+	/**
+	 * @param {Chart} chart - The chart to animate.
+	 * @param {Chart.Animation} animation - The animation that we will animate.
+	 * @param {number} duration - The animation duration in ms.
+	 * @param {boolean} lazy - if true, the chart is not marked as animating to enable more responsive interactions
+	 */
+	addAnimation: function(chart, animation, duration, lazy) {
+		var animations = this.animations;
+		var i, ilen;
+
+		animation.chart = chart;
+		animation.startTime = Date.now();
+		animation.duration = duration;
+
+		if (!lazy) {
+			chart.animating = true;
+		}
+
+		for (i = 0, ilen = animations.length; i < ilen; ++i) {
+			if (animations[i].chart === chart) {
+				animations[i] = animation;
+				return;
+			}
+		}
+
+		animations.push(animation);
+
+		// If there are no animations queued, manually kickstart a digest, for lack of a better word
+		if (animations.length === 1) {
+			this.requestAnimationFrame();
+		}
+	},
+
+	cancelAnimation: function(chart) {
+		var index = helpers.findIndex(this.animations, function(animation) {
+			return animation.chart === chart;
+		});
+
+		if (index !== -1) {
+			this.animations.splice(index, 1);
+			chart.animating = false;
+		}
+	},
+
+	requestAnimationFrame: function() {
+		var me = this;
+		if (me.request === null) {
+			// Skip animation frame requests until the active one is executed.
+			// This can happen when processing mouse events, e.g. 'mousemove'
+			// and 'mouseout' events will trigger multiple renders.
+			me.request = helpers.requestAnimFrame.call(window, function() {
+				me.request = null;
+				me.startDigest();
+			});
+		}
+	},
+
+	/**
+	 * @private
+	 */
+	startDigest: function() {
+		var me = this;
+
+		me.advance();
+
+		// Do we have more stuff to animate?
+		if (me.animations.length > 0) {
+			me.requestAnimationFrame();
+		}
+	},
+
+	/**
+	 * @private
+	 */
+	advance: function() {
+		var animations = this.animations;
+		var animation, chart, numSteps, nextStep;
+		var i = 0;
+
+		// 1 animation per chart, so we are looping charts here
+		while (i < animations.length) {
+			animation = animations[i];
+			chart = animation.chart;
+			numSteps = animation.numSteps;
+
+			// Make sure that currentStep starts at 1
+			// https://github.com/chartjs/Chart.js/issues/6104
+			nextStep = Math.floor((Date.now() - animation.startTime) / animation.duration * numSteps) + 1;
+			animation.currentStep = Math.min(nextStep, numSteps);
+
+			helpers.callback(animation.render, [chart, animation], chart);
+			helpers.callback(animation.onAnimationProgress, [animation], chart);
+
+			if (animation.currentStep >= numSteps) {
+				helpers.callback(animation.onAnimationComplete, [animation], chart);
+				chart.animating = false;
+				animations.splice(i, 1);
+			} else {
+				++i;
+			}
+		}
+	}
+};

assets/chart/src/core/core.datasetController.js

@@ -0,0 +1,575 @@
+'use strict';
+
+var helpers = require('../helpers/index');
+
+var resolve = helpers.options.resolve;
+
+var arrayEvents = ['push', 'pop', 'shift', 'splice', 'unshift'];
+
+/**
+ * Hooks the array methods that add or remove values ('push', pop', 'shift', 'splice',
+ * 'unshift') and notify the listener AFTER the array has been altered. Listeners are
+ * called on the 'onData*' callbacks (e.g. onDataPush, etc.) with same arguments.
+ */
+function listenArrayEvents(array, listener) {
+	if (array._chartjs) {
+		array._chartjs.listeners.push(listener);
+		return;
+	}
+
+	Object.defineProperty(array, '_chartjs', {
+		configurable: true,
+		enumerable: false,
+		value: {
+			listeners: [listener]
+		}
+	});
+
+	arrayEvents.forEach(function(key) {
+		var method = 'onData' + key.charAt(0).toUpperCase() + key.slice(1);
+		var base = array[key];
+
+		Object.defineProperty(array, key, {
+			configurable: true,
+			enumerable: false,
+			value: function() {
+				var args = Array.prototype.slice.call(arguments);
+				var res = base.apply(this, args);
+
+				helpers.each(array._chartjs.listeners, function(object) {
+					if (typeof object[method] === 'function') {
+						object[method].apply(object, args);
+					}
+				});
+
+				return res;
+			}
+		});
+	});
+}
+
+/**
+ * Removes the given array event listener and cleanup extra attached properties (such as
+ * the _chartjs stub and overridden methods) if array doesn't have any more listeners.
+ */
+function unlistenArrayEvents(array, listener) {
+	var stub = array._chartjs;
+	if (!stub) {
+		return;
+	}
+
+	var listeners = stub.listeners;
+	var index = listeners.indexOf(listener);
+	if (index !== -1) {
+		listeners.splice(index, 1);
+	}
+
+	if (listeners.length > 0) {
+		return;
+	}
+
+	arrayEvents.forEach(function(key) {
+		delete array[key];
+	});
+
+	delete array._chartjs;
+}
+
+// Base class for all dataset controllers (line, bar, etc)
+var DatasetController = function(chart, datasetIndex) {
+	this.initialize(chart, datasetIndex);
+};
+
+helpers.extend(DatasetController.prototype, {
+
+	/**
+	 * Element type used to generate a meta dataset (e.g. Chart.element.Line).
+	 * @type {Chart.core.element}
+	 */
+	datasetElementType: null,
+
+	/**
+	 * Element type used to generate a meta data (e.g. Chart.element.Point).
+	 * @type {Chart.core.element}
+	 */
+	dataElementType: null,
+
+	/**
+	 * Dataset element option keys to be resolved in _resolveDatasetElementOptions.
+	 * A derived controller may override this to resolve controller-specific options.
+	 * The keys defined here are for backward compatibility for legend styles.
+	 * @private
+	 */
+	_datasetElementOptions: [
+		'backgroundColor',
+		'borderCapStyle',
+		'borderColor',
+		'borderDash',
+		'borderDashOffset',
+		'borderJoinStyle',
+		'borderWidth'
+	],
+
+	/**
+	 * Data element option keys to be resolved in _resolveDataElementOptions.
+	 * A derived controller may override this to resolve controller-specific options.
+	 * The keys defined here are for backward compatibility for legend styles.
+	 * @private
+	 */
+	_dataElementOptions: [
+		'backgroundColor',
+		'borderColor',
+		'borderWidth',
+		'pointStyle'
+	],
+
+	initialize: function(chart, datasetIndex) {
+		var me = this;
+		me.chart = chart;
+		me.index = datasetIndex;
+		me.linkScales();
+		me.addElements();
+		me._type = me.getMeta().type;
+	},
+
+	updateIndex: function(datasetIndex) {
+		this.index = datasetIndex;
+	},
+
+	linkScales: function() {
+		var me = this;
+		var meta = me.getMeta();
+		var chart = me.chart;
+		var scales = chart.scales;
+		var dataset = me.getDataset();
+		var scalesOpts = chart.options.scales;
+
+		if (meta.xAxisID === null || !(meta.xAxisID in scales) || dataset.xAxisID) {
+			meta.xAxisID = dataset.xAxisID || scalesOpts.xAxes[0].id;
+		}
+		if (meta.yAxisID === null || !(meta.yAxisID in scales) || dataset.yAxisID) {
+			meta.yAxisID = dataset.yAxisID || scalesOpts.yAxes[0].id;
+		}
+	},
+
+	getDataset: function() {
+		return this.chart.data.datasets[this.index];
+	},
+
+	getMeta: function() {
+		return this.chart.getDatasetMeta(this.index);
+	},
+
+	getScaleForId: function(scaleID) {
+		return this.chart.scales[scaleID];
+	},
+
+	/**
+	 * @private
+	 */
+	_getValueScaleId: function() {
+		return this.getMeta().yAxisID;
+	},
+
+	/**
+	 * @private
+	 */
+	_getIndexScaleId: function() {
+		return this.getMeta().xAxisID;
+	},
+
+	/**
+	 * @private
+	 */
+	_getValueScale: function() {
+		return this.getScaleForId(this._getValueScaleId());
+	},
+
+	/**
+	 * @private
+	 */
+	_getIndexScale: function() {
+		return this.getScaleForId(this._getIndexScaleId());
+	},
+
+	reset: function() {
+		this._update(true);
+	},
+
+	/**
+	 * @private
+	 */
+	destroy: function() {
+		if (this._data) {
+			unlistenArrayEvents(this._data, this);
+		}
+	},
+
+	createMetaDataset: function() {
+		var me = this;
+		var type = me.datasetElementType;
+		return type && new type({
+			_chart: me.chart,
+			_datasetIndex: me.index
+		});
+	},
+
+	createMetaData: function(index) {
+		var me = this;
+		var type = me.dataElementType;
+		return type && new type({
+			_chart: me.chart,
+			_datasetIndex: me.index,
+			_index: index
+		});
+	},
+
+	addElements: function() {
+		var me = this;
+		var meta = me.getMeta();
+		var data = me.getDataset().data || [];
+		var metaData = meta.data;
+		var i, ilen;
+
+		for (i = 0, ilen = data.length; i < ilen; ++i) {
+			metaData[i] = metaData[i] || me.createMetaData(i);
+		}
+
+		meta.dataset = meta.dataset || me.createMetaDataset();
+	},
+
+	addElementAndReset: function(index) {
+		var element = this.createMetaData(index);
+		this.getMeta().data.splice(index, 0, element);
+		this.updateElement(element, index, true);
+	},
+
+	buildOrUpdateElements: function() {
+		var me = this;
+		var dataset = me.getDataset();
+		var data = dataset.data || (dataset.data = []);
+
+		// In order to correctly handle data addition/deletion animation (an thus simulate
+		// real-time charts), we need to monitor these data modifications and synchronize
+		// the internal meta data accordingly.
+		if (me._data !== data) {
+			if (me._data) {
+				// This case happens when the user replaced the data array instance.
+				unlistenArrayEvents(me._data, me);
+			}
+
+			if (data && Object.isExtensible(data)) {
+				listenArrayEvents(data, me);
+			}
+			me._data = data;
+		}
+
+		// Re-sync meta data in case the user replaced the data array or if we missed
+		// any updates and so make sure that we handle number of datapoints changing.
+		me.resyncElements();
+	},
+
+	/**
+	 * Returns the merged user-supplied and default dataset-level options
+	 * @private
+	 */
+	_configure: function() {
+		var me = this;
+		me._config = helpers.merge({}, [
+			me.chart.options.datasets[me._type],
+			me.getDataset(),
+		], {
+			merger: function(key, target, source) {
+				if (key !== '_meta' && key !== 'data') {
+					helpers._merger(key, target, source);
+				}
+			}
+		});
+	},
+
+	_update: function(reset) {
+		var me = this;
+		me._configure();
+		me._cachedDataOpts = null;
+		me.update(reset);
+	},
+
+	update: helpers.noop,
+
+	transition: function(easingValue) {
+		var meta = this.getMeta();
+		var elements = meta.data || [];
+		var ilen = elements.length;
+		var i = 0;
+
+		for (; i < ilen; ++i) {
+			elements[i].transition(easingValue);
+		}
+
+		if (meta.dataset) {
+			meta.dataset.transition(easingValue);
+		}
+	},
+
+	draw: function() {
+		var meta = this.getMeta();
+		var elements = meta.data || [];
+		var ilen = elements.length;
+		var i = 0;
+
+		if (meta.dataset) {
+			meta.dataset.draw();
+		}
+
+		for (; i < ilen; ++i) {
+			elements[i].draw();
+		}
+	},
+
+	/**
+	 * Returns a set of predefined style properties that should be used to represent the dataset
+	 * or the data if the index is specified
+	 * @param {number} index - data index
+	 * @return {IStyleInterface} style object
+	 */
+	getStyle: function(index) {
+		var me = this;
+		var meta = me.getMeta();
+		var dataset = meta.dataset;
+		var style;
+
+		me._configure();
+		if (dataset && index === undefined) {
+			style = me._resolveDatasetElementOptions(dataset || {});
+		} else {
+			index = index || 0;
+			style = me._resolveDataElementOptions(meta.data[index] || {}, index);
+		}
+
+		if (style.fill === false || style.fill === null) {
+			style.backgroundColor = style.borderColor;
+		}
+
+		return style;
+	},
+
+	/**
+	 * @private
+	 */
+	_resolveDatasetElementOptions: function(element, hover) {
+		var me = this;
+		var chart = me.chart;
+		var datasetOpts = me._config;
+		var custom = element.custom || {};
+		var options = chart.options.elements[me.datasetElementType.prototype._type] || {};
+		var elementOptions = me._datasetElementOptions;
+		var values = {};
+		var i, ilen, key, readKey;
+
+		// Scriptable options
+		var context = {
+			chart: chart,
+			dataset: me.getDataset(),
+			datasetIndex: me.index,
+			hover: hover
+		};
+
+		for (i = 0, ilen = elementOptions.length; i < ilen; ++i) {
+			key = elementOptions[i];
+			readKey = hover ? 'hover' + key.charAt(0).toUpperCase() + key.slice(1) : key;
+			values[key] = resolve([
+				custom[readKey],
+				datasetOpts[readKey],
+				options[readKey]
+			], context);
+		}
+
+		return values;
+	},
+
+	/**
+	 * @private
+	 */
+	_resolveDataElementOptions: function(element, index) {
+		var me = this;
+		var custom = element && element.custom;
+		var cached = me._cachedDataOpts;
+		if (cached && !custom) {
+			return cached;
+		}
+		var chart = me.chart;
+		var datasetOpts = me._config;
+		var options = chart.options.elements[me.dataElementType.prototype._type] || {};
+		var elementOptions = me._dataElementOptions;
+		var values = {};
+
+		// Scriptable options
+		var context = {
+			chart: chart,
+			dataIndex: index,
+			dataset: me.getDataset(),
+			datasetIndex: me.index
+		};
+
+		// `resolve` sets cacheable to `false` if any option is indexed or scripted
+		var info = {cacheable: !custom};
+
+		var keys, i, ilen, key;
+
+		custom = custom || {};
+
+		if (helpers.isArray(elementOptions)) {
+			for (i = 0, ilen = elementOptions.length; i < ilen; ++i) {
+				key = elementOptions[i];
+				values[key] = resolve([
+					custom[key],
+					datasetOpts[key],
+					options[key]
+				], context, index, info);
+			}
+		} else {
+			keys = Object.keys(elementOptions);
+			for (i = 0, ilen = keys.length; i < ilen; ++i) {
+				key = keys[i];
+				values[key] = resolve([
+					custom[key],
+					datasetOpts[elementOptions[key]],
+					datasetOpts[key],
+					options[key]
+				], context, index, info);
+			}
+		}
+
+		if (info.cacheable) {
+			me._cachedDataOpts = Object.freeze(values);
+		}
+
+		return values;
+	},
+
+	removeHoverStyle: function(element) {
+		helpers.merge(element._model, element.$previousStyle || {});
+		delete element.$previousStyle;
+	},
+
+	setHoverStyle: function(element) {
+		var dataset = this.chart.data.datasets[element._datasetIndex];
+		var index = element._index;
+		var custom = element.custom || {};
+		var model = element._model;
+		var getHoverColor = helpers.getHoverColor;
+
+		element.$previousStyle = {
+			backgroundColor: model.backgroundColor,
+			borderColor: model.borderColor,
+			borderWidth: model.borderWidth
+		};
+
+		model.backgroundColor = resolve([custom.hoverBackgroundColor, dataset.hoverBackgroundColor, getHoverColor(model.backgroundColor)], undefined, index);
+		model.borderColor = resolve([custom.hoverBorderColor, dataset.hoverBorderColor, getHoverColor(model.borderColor)], undefined, index);
+		model.borderWidth = resolve([custom.hoverBorderWidth, dataset.hoverBorderWidth, model.borderWidth], undefined, index);
+	},
+
+	/**
+	 * @private
+	 */
+	_removeDatasetHoverStyle: function() {
+		var element = this.getMeta().dataset;
+
+		if (element) {
+			this.removeHoverStyle(element);
+		}
+	},
+
+	/**
+	 * @private
+	 */
+	_setDatasetHoverStyle: function() {
+		var element = this.getMeta().dataset;
+		var prev = {};
+		var i, ilen, key, keys, hoverOptions, model;
+
+		if (!element) {
+			return;
+		}
+
+		model = element._model;
+		hoverOptions = this._resolveDatasetElementOptions(element, true);
+
+		keys = Object.keys(hoverOptions);
+		for (i = 0, ilen = keys.length; i < ilen; ++i) {
+			key = keys[i];
+			prev[key] = model[key];
+			model[key] = hoverOptions[key];
+		}
+
+		element.$previousStyle = prev;
+	},
+
+	/**
+	 * @private
+	 */
+	resyncElements: function() {
+		var me = this;
+		var meta = me.getMeta();
+		var data = me.getDataset().data;
+		var numMeta = meta.data.length;
+		var numData = data.length;
+
+		if (numData < numMeta) {
+			meta.data.splice(numData, numMeta - numData);
+		} else if (numData > numMeta) {
+			me.insertElements(numMeta, numData - numMeta);
+		}
+	},
+
+	/**
+	 * @private
+	 */
+	insertElements: function(start, count) {
+		for (var i = 0; i < count; ++i) {
+			this.addElementAndReset(start + i);
+		}
+	},
+
+	/**
+	 * @private
+	 */
+	onDataPush: function() {
+		var count = arguments.length;
+		this.insertElements(this.getDataset().data.length - count, count);
+	},
+
+	/**
+	 * @private
+	 */
+	onDataPop: function() {
+		this.getMeta().data.pop();
+	},
+
+	/**
+	 * @private
+	 */
+	onDataShift: function() {
+		this.getMeta().data.shift();
+	},
+
+	/**
+	 * @private
+	 */
+	onDataSplice: function(start, count) {
+		this.getMeta().data.splice(start, count);
+		this.insertElements(start, arguments.length - 2);
+	},
+
+	/**
+	 * @private
+	 */
+	onDataUnshift: function() {
+		this.insertElements(0, arguments.length);
+	}
+});
+
+DatasetController.extend = helpers.inherits;
+
+module.exports = DatasetController;

assets/chart/src/core/core.defaults.js

@@ -0,0 +1,26 @@
+'use strict';
+
+var helpers = require('../helpers/helpers.core');
+
+var defaults = {
+	/**
+	 * @private
+	 */
+	_set: function(scope, values) {
+		return helpers.merge(this[scope] || (this[scope] = {}), values);
+	}
+};
+
+// TODO(v3): remove 'global' from namespace.  all default are global and
+// there's inconsistency around which options are under 'global'
+defaults._set('global', {
+	defaultColor: 'rgba(0,0,0,0.1)',
+	defaultFontColor: '#666',
+	defaultFontFamily: "'Helvetica Neue', 'Helvetica', 'Arial', sans-serif",
+	defaultFontSize: 12,
+	defaultFontStyle: 'normal',
+	defaultLineHeight: 1.2,
+	showLines: true
+});
+
+module.exports = defaults;

assets/chart/src/core/core.element.js

@@ -0,0 +1,116 @@
+'use strict';
+
+var color = require('chartjs-color');
+var helpers = require('../helpers/index');
+
+function interpolate(start, view, model, ease) {
+	var keys = Object.keys(model);
+	var i, ilen, key, actual, origin, target, type, c0, c1;
+
+	for (i = 0, ilen = keys.length; i < ilen; ++i) {
+		key = keys[i];
+
+		target = model[key];
+
+		// if a value is added to the model after pivot() has been called, the view
+		// doesn't contain it, so let's initialize the view to the target value.
+		if (!view.hasOwnProperty(key)) {
+			view[key] = target;
+		}
+
+		actual = view[key];
+
+		if (actual === target || key[0] === '_') {
+			continue;
+		}
+
+		if (!start.hasOwnProperty(key)) {
+			start[key] = actual;
+		}
+
+		origin = start[key];
+
+		type = typeof target;
+
+		if (type === typeof origin) {
+			if (type === 'string') {
+				c0 = color(origin);
+				if (c0.valid) {
+					c1 = color(target);
+					if (c1.valid) {
+						view[key] = c1.mix(c0, ease).rgbString();
+						continue;
+					}
+				}
+			} else if (helpers.isFinite(origin) && helpers.isFinite(target)) {
+				view[key] = origin + (target - origin) * ease;
+				continue;
+			}
+		}
+
+		view[key] = target;
+	}
+}
+
+var Element = function(configuration) {
+	helpers.extend(this, configuration);
+	this.initialize.apply(this, arguments);
+};
+
+helpers.extend(Element.prototype, {
+	_type: undefined,
+
+	initialize: function() {
+		this.hidden = false;
+	},
+
+	pivot: function() {
+		var me = this;
+		if (!me._view) {
+			me._view = helpers.extend({}, me._model);
+		}
+		me._start = {};
+		return me;
+	},
+
+	transition: function(ease) {
+		var me = this;
+		var model = me._model;
+		var start = me._start;
+		var view = me._view;
+
+		// No animation -> No Transition
+		if (!model || ease === 1) {
+			me._view = helpers.extend({}, model);
+			me._start = null;
+			return me;
+		}
+
+		if (!view) {
+			view = me._view = {};
+		}
+
+		if (!start) {
+			start = me._start = {};
+		}
+
+		interpolate(start, view, model, ease);
+
+		return me;
+	},
+
+	tooltipPosition: function() {
+		return {
+			x: this._model.x,
+			y: this._model.y
+		};
+	},
+
+	hasValue: function() {
+		return helpers.isNumber(this._model.x) && helpers.isNumber(this._model.y);
+	}
+});
+
+Element.extend = helpers.inherits;
+
+module.exports = Element;

assets/chart/src/core/core.helpers.js

@@ -0,0 +1,620 @@
+/* global window: false */
+/* global document: false */
+'use strict';
+
+var color = require('chartjs-color');
+var defaults = require('./core.defaults');
+var helpers = require('../helpers/index');
+
+module.exports = function() {
+
+	// -- Basic js utility methods
+
+	helpers.where = function(collection, filterCallback) {
+		if (helpers.isArray(collection) && Array.prototype.filter) {
+			return collection.filter(filterCallback);
+		}
+		var filtered = [];
+
+		helpers.each(collection, function(item) {
+			if (filterCallback(item)) {
+				filtered.push(item);
+			}
+		});
+
+		return filtered;
+	};
+	helpers.findIndex = Array.prototype.findIndex ?
+		function(array, callback, scope) {
+			return array.findIndex(callback, scope);
+		} :
+		function(array, callback, scope) {
+			scope = scope === undefined ? array : scope;
+			for (var i = 0, ilen = array.length; i < ilen; ++i) {
+				if (callback.call(scope, array[i], i, array)) {
+					return i;
+				}
+			}
+			return -1;
+		};
+	helpers.findNextWhere = function(arrayToSearch, filterCallback, startIndex) {
+		// Default to start of the array
+		if (helpers.isNullOrUndef(startIndex)) {
+			startIndex = -1;
+		}
+		for (var i = startIndex + 1; i < arrayToSearch.length; i++) {
+			var currentItem = arrayToSearch[i];
+			if (filterCallback(currentItem)) {
+				return currentItem;
+			}
+		}
+	};
+	helpers.findPreviousWhere = function(arrayToSearch, filterCallback, startIndex) {
+		// Default to end of the array
+		if (helpers.isNullOrUndef(startIndex)) {
+			startIndex = arrayToSearch.length;
+		}
+		for (var i = startIndex - 1; i >= 0; i--) {
+			var currentItem = arrayToSearch[i];
+			if (filterCallback(currentItem)) {
+				return currentItem;
+			}
+		}
+	};
+
+	// -- Math methods
+	helpers.isNumber = function(n) {
+		return !isNaN(parseFloat(n)) && isFinite(n);
+	};
+	helpers.almostEquals = function(x, y, epsilon) {
+		return Math.abs(x - y) < epsilon;
+	};
+	helpers.almostWhole = function(x, epsilon) {
+		var rounded = Math.round(x);
+		return ((rounded - epsilon) <= x) && ((rounded + epsilon) >= x);
+	};
+	helpers.max = function(array) {
+		return array.reduce(function(max, value) {
+			if (!isNaN(value)) {
+				return Math.max(max, value);
+			}
+			return max;
+		}, Number.NEGATIVE_INFINITY);
+	};
+	helpers.min = function(array) {
+		return array.reduce(function(min, value) {
+			if (!isNaN(value)) {
+				return Math.min(min, value);
+			}
+			return min;
+		}, Number.POSITIVE_INFINITY);
+	};
+	helpers.sign = Math.sign ?
+		function(x) {
+			return Math.sign(x);
+		} :
+		function(x) {
+			x = +x; // convert to a number
+			if (x === 0 || isNaN(x)) {
+				return x;
+			}
+			return x > 0 ? 1 : -1;
+		};
+	helpers.toRadians = function(degrees) {
+		return degrees * (Math.PI / 180);
+	};
+	helpers.toDegrees = function(radians) {
+		return radians * (180 / Math.PI);
+	};
+
+	/**
+	 * Returns the number of decimal places
+	 * i.e. the number of digits after the decimal point, of the value of this Number.
+	 * @param {number} x - A number.
+	 * @returns {number} The number of decimal places.
+	 * @private
+	 */
+	helpers._decimalPlaces = function(x) {
+		if (!helpers.isFinite(x)) {
+			return;
+		}
+		var e = 1;
+		var p = 0;
+		while (Math.round(x * e) / e !== x) {
+			e *= 10;
+			p++;
+		}
+		return p;
+	};
+
+	// Gets the angle from vertical upright to the point about a centre.
+	helpers.getAngleFromPoint = function(centrePoint, anglePoint) {
+		var distanceFromXCenter = anglePoint.x - centrePoint.x;
+		var distanceFromYCenter = anglePoint.y - centrePoint.y;
+		var radialDistanceFromCenter = Math.sqrt(distanceFromXCenter * distanceFromXCenter + distanceFromYCenter * distanceFromYCenter);
+
+		var angle = Math.atan2(distanceFromYCenter, distanceFromXCenter);
+
+		if (angle < (-0.5 * Math.PI)) {
+			angle += 2.0 * Math.PI; // make sure the returned angle is in the range of (-PI/2, 3PI/2]
+		}
+
+		return {
+			angle: angle,
+			distance: radialDistanceFromCenter
+		};
+	};
+	helpers.distanceBetweenPoints = function(pt1, pt2) {
+		return Math.sqrt(Math.pow(pt2.x - pt1.x, 2) + Math.pow(pt2.y - pt1.y, 2));
+	};
+
+	/**
+	 * Provided for backward compatibility, not available anymore
+	 * @function Chart.helpers.aliasPixel
+	 * @deprecated since version 2.8.0
+	 * @todo remove at version 3
+	 */
+	helpers.aliasPixel = function(pixelWidth) {
+		return (pixelWidth % 2 === 0) ? 0 : 0.5;
+	};
+
+	/**
+	 * Returns the aligned pixel value to avoid anti-aliasing blur
+	 * @param {Chart} chart - The chart instance.
+	 * @param {number} pixel - A pixel value.
+	 * @param {number} width - The width of the element.
+	 * @returns {number} The aligned pixel value.
+	 * @private
+	 */
+	helpers._alignPixel = function(chart, pixel, width) {
+		var devicePixelRatio = chart.currentDevicePixelRatio;
+		var halfWidth = width / 2;
+		return Math.round((pixel - halfWidth) * devicePixelRatio) / devicePixelRatio + halfWidth;
+	};
+
+	helpers.splineCurve = function(firstPoint, middlePoint, afterPoint, t) {
+		// Props to Rob Spencer at scaled innovation for his post on splining between points
+		// http://scaledinnovation.com/analytics/splines/aboutSplines.html
+
+		// This function must also respect "skipped" points
+
+		var previous = firstPoint.skip ? middlePoint : firstPoint;
+		var current = middlePoint;
+		var next = afterPoint.skip ? middlePoint : afterPoint;
+
+		var d01 = Math.sqrt(Math.pow(current.x - previous.x, 2) + Math.pow(current.y - previous.y, 2));
+		var d12 = Math.sqrt(Math.pow(next.x - current.x, 2) + Math.pow(next.y - current.y, 2));
+
+		var s01 = d01 / (d01 + d12);
+		var s12 = d12 / (d01 + d12);
+
+		// If all points are the same, s01 & s02 will be inf
+		s01 = isNaN(s01) ? 0 : s01;
+		s12 = isNaN(s12) ? 0 : s12;
+
+		var fa = t * s01; // scaling factor for triangle Ta
+		var fb = t * s12;
+
+		return {
+			previous: {
+				x: current.x - fa * (next.x - previous.x),
+				y: current.y - fa * (next.y - previous.y)
+			},
+			next: {
+				x: current.x + fb * (next.x - previous.x),
+				y: current.y + fb * (next.y - previous.y)
+			}
+		};
+	};
+	helpers.EPSILON = Number.EPSILON || 1e-14;
+	helpers.splineCurveMonotone = function(points) {
+		// This function calculates Bézier control points in a similar way than |splineCurve|,
+		// but preserves monotonicity of the provided data and ensures no local extremums are added
+		// between the dataset discrete points due to the interpolation.
+		// See : https://en.wikipedia.org/wiki/Monotone_cubic_interpolation
+
+		var pointsWithTangents = (points || []).map(function(point) {
+			return {
+				model: point._model,
+				deltaK: 0,
+				mK: 0
+			};
+		});
+
+		// Calculate slopes (deltaK) and initialize tangents (mK)
+		var pointsLen = pointsWithTangents.length;
+		var i, pointBefore, pointCurrent, pointAfter;
+		for (i = 0; i < pointsLen; ++i) {
+			pointCurrent = pointsWithTangents[i];
+			if (pointCurrent.model.skip) {
+				continue;
+			}
+
+			pointBefore = i > 0 ? pointsWithTangents[i - 1] : null;
+			pointAfter = i < pointsLen - 1 ? pointsWithTangents[i + 1] : null;
+			if (pointAfter && !pointAfter.model.skip) {
+				var slopeDeltaX = (pointAfter.model.x - pointCurrent.model.x);
+
+				// In the case of two points that appear at the same x pixel, slopeDeltaX is 0
+				pointCurrent.deltaK = slopeDeltaX !== 0 ? (pointAfter.model.y - pointCurrent.model.y) / slopeDeltaX : 0;
+			}
+
+			if (!pointBefore || pointBefore.model.skip) {
+				pointCurrent.mK = pointCurrent.deltaK;
+			} else if (!pointAfter || pointAfter.model.skip) {
+				pointCurrent.mK = pointBefore.deltaK;
+			} else if (this.sign(pointBefore.deltaK) !== this.sign(pointCurrent.deltaK)) {
+				pointCurrent.mK = 0;
+			} else {
+				pointCurrent.mK = (pointBefore.deltaK + pointCurrent.deltaK) / 2;
+			}
+		}
+
+		// Adjust tangents to ensure monotonic properties
+		var alphaK, betaK, tauK, squaredMagnitude;
+		for (i = 0; i < pointsLen - 1; ++i) {
+			pointCurrent = pointsWithTangents[i];
+			pointAfter = pointsWithTangents[i + 1];
+			if (pointCurrent.model.skip || pointAfter.model.skip) {
+				continue;
+			}
+
+			if (helpers.almostEquals(pointCurrent.deltaK, 0, this.EPSILON)) {
+				pointCurrent.mK = pointAfter.mK = 0;
+				continue;
+			}
+
+			alphaK = pointCurrent.mK / pointCurrent.deltaK;
+			betaK = pointAfter.mK / pointCurrent.deltaK;
+			squaredMagnitude = Math.pow(alphaK, 2) + Math.pow(betaK, 2);
+			if (squaredMagnitude <= 9) {
+				continue;
+			}
+
+			tauK = 3 / Math.sqrt(squaredMagnitude);
+			pointCurrent.mK = alphaK * tauK * pointCurrent.deltaK;
+			pointAfter.mK = betaK * tauK * pointCurrent.deltaK;
+		}
+
+		// Compute control points
+		var deltaX;
+		for (i = 0; i < pointsLen; ++i) {
+			pointCurrent = pointsWithTangents[i];
+			if (pointCurrent.model.skip) {
+				continue;
+			}
+
+			pointBefore = i > 0 ? pointsWithTangents[i - 1] : null;
+			pointAfter = i < pointsLen - 1 ? pointsWithTangents[i + 1] : null;
+			if (pointBefore && !pointBefore.model.skip) {
+				deltaX = (pointCurrent.model.x - pointBefore.model.x) / 3;
+				pointCurrent.model.controlPointPreviousX = pointCurrent.model.x - deltaX;
+				pointCurrent.model.controlPointPreviousY = pointCurrent.model.y - deltaX * pointCurrent.mK;
+			}
+			if (pointAfter && !pointAfter.model.skip) {
+				deltaX = (pointAfter.model.x - pointCurrent.model.x) / 3;
+				pointCurrent.model.controlPointNextX = pointCurrent.model.x + deltaX;
+				pointCurrent.model.controlPointNextY = pointCurrent.model.y + deltaX * pointCurrent.mK;
+			}
+		}
+	};
+	helpers.nextItem = function(collection, index, loop) {
+		if (loop) {
+			return index >= collection.length - 1 ? collection[0] : collection[index + 1];
+		}
+		return index >= collection.length - 1 ? collection[collection.length - 1] : collection[index + 1];
+	};
+	helpers.previousItem = function(collection, index, loop) {
+		if (loop) {
+			return index <= 0 ? collection[collection.length - 1] : collection[index - 1];
+		}
+		return index <= 0 ? collection[0] : collection[index - 1];
+	};
+	// Implementation of the nice number algorithm used in determining where axis labels will go
+	helpers.niceNum = function(range, round) {
+		var exponent = Math.floor(helpers.log10(range));
+		var fraction = range / Math.pow(10, exponent);
+		var niceFraction;
+
+		if (round) {
+			if (fraction < 1.5) {
+				niceFraction = 1;
+			} else if (fraction < 3) {
+				niceFraction = 2;
+			} else if (fraction < 7) {
+				niceFraction = 5;
+			} else {
+				niceFraction = 10;
+			}
+		} else if (fraction <= 1.0) {
+			niceFraction = 1;
+		} else if (fraction <= 2) {
+			niceFraction = 2;
+		} else if (fraction <= 5) {
+			niceFraction = 5;
+		} else {
+			niceFraction = 10;
+		}
+
+		return niceFraction * Math.pow(10, exponent);
+	};
+	// Request animation polyfill - https://www.paulirish.com/2011/requestanimationframe-for-smart-animating/
+	helpers.requestAnimFrame = (function() {
+		if (typeof window === 'undefined') {
+			return function(callback) {
+				callback();
+			};
+		}
+		return window.requestAnimationFrame ||
+			window.webkitRequestAnimationFrame ||
+			window.mozRequestAnimationFrame ||
+			window.oRequestAnimationFrame ||
+			window.msRequestAnimationFrame ||
+			function(callback) {
+				return window.setTimeout(callback, 1000 / 60);
+			};
+	}());
+	// -- DOM methods
+	helpers.getRelativePosition = function(evt, chart) {
+		var mouseX, mouseY;
+		var e = evt.originalEvent || evt;
+		var canvas = evt.target || evt.srcElement;
+		var boundingRect = canvas.getBoundingClientRect();
+
+		var touches = e.touches;
+		if (touches && touches.length > 0) {
+			mouseX = touches[0].clientX;
+			mouseY = touches[0].clientY;
+
+		} else {
+			mouseX = e.clientX;
+			mouseY = e.clientY;
+		}
+
+		// Scale mouse coordinates into canvas coordinates
+		// by following the pattern laid out by 'jerryj' in the comments of
+		// https://www.html5canvastutorials.com/advanced/html5-canvas-mouse-coordinates/
+		var paddingLeft = parseFloat(helpers.getStyle(canvas, 'padding-left'));
+		var paddingTop = parseFloat(helpers.getStyle(canvas, 'padding-top'));
+		var paddingRight = parseFloat(helpers.getStyle(canvas, 'padding-right'));
+		var paddingBottom = parseFloat(helpers.getStyle(canvas, 'padding-bottom'));
+		var width = boundingRect.right - boundingRect.left - paddingLeft - paddingRight;
+		var height = boundingRect.bottom - boundingRect.top - paddingTop - paddingBottom;
+
+		// We divide by the current device pixel ratio, because the canvas is scaled up by that amount in each direction. However
+		// the backend model is in unscaled coordinates. Since we are going to deal with our model coordinates, we go back here
+		mouseX = Math.round((mouseX - boundingRect.left - paddingLeft) / (width) * canvas.width / chart.currentDevicePixelRatio);
+		mouseY = Math.round((mouseY - boundingRect.top - paddingTop) / (height) * canvas.height / chart.currentDevicePixelRatio);
+
+		return {
+			x: mouseX,
+			y: mouseY
+		};
+
+	};
+
+	// Private helper function to convert max-width/max-height values that may be percentages into a number
+	function parseMaxStyle(styleValue, node, parentProperty) {
+		var valueInPixels;
+		if (typeof styleValue === 'string') {
+			valueInPixels = parseInt(styleValue, 10);
+
+			if (styleValue.indexOf('%') !== -1) {
+				// percentage * size in dimension
+				valueInPixels = valueInPixels / 100 * node.parentNode[parentProperty];
+			}
+		} else {
+			valueInPixels = styleValue;
+		}
+
+		return valueInPixels;
+	}
+
+	/**
+	 * Returns if the given value contains an effective constraint.
+	 * @private
+	 */
+	function isConstrainedValue(value) {
+		return value !== undefined && value !== null && value !== 'none';
+	}
+
+	/**
+	 * Returns the max width or height of the given DOM node in a cross-browser compatible fashion
+	 * @param {HTMLElement} domNode - the node to check the constraint on
+	 * @param {string} maxStyle - the style that defines the maximum for the direction we are using ('max-width' / 'max-height')
+	 * @param {string} percentageProperty - property of parent to use when calculating width as a percentage
+	 * @see {@link https://www.nathanaeljones.com/blog/2013/reading-max-width-cross-browser}
+	 */
+	function getConstraintDimension(domNode, maxStyle, percentageProperty) {
+		var view = document.defaultView;
+		var parentNode = helpers._getParentNode(domNode);
+		var constrainedNode = view.getComputedStyle(domNode)[maxStyle];
+		var constrainedContainer = view.getComputedStyle(parentNode)[maxStyle];
+		var hasCNode = isConstrainedValue(constrainedNode);
+		var hasCContainer = isConstrainedValue(constrainedContainer);
+		var infinity = Number.POSITIVE_INFINITY;
+
+		if (hasCNode || hasCContainer) {
+			return Math.min(
+				hasCNode ? parseMaxStyle(constrainedNode, domNode, percentageProperty) : infinity,
+				hasCContainer ? parseMaxStyle(constrainedContainer, parentNode, percentageProperty) : infinity);
+		}
+
+		return 'none';
+	}
+	// returns Number or undefined if no constraint
+	helpers.getConstraintWidth = function(domNode) {
+		return getConstraintDimension(domNode, 'max-width', 'clientWidth');
+	};
+	// returns Number or undefined if no constraint
+	helpers.getConstraintHeight = function(domNode) {
+		return getConstraintDimension(domNode, 'max-height', 'clientHeight');
+	};
+	/**
+	 * @private
+ 	 */
+	helpers._calculatePadding = function(container, padding, parentDimension) {
+		padding = helpers.getStyle(container, padding);
+
+		return padding.indexOf('%') > -1 ? parentDimension * parseInt(padding, 10) / 100 : parseInt(padding, 10);
+	};
+	/**
+	 * @private
+	 */
+	helpers._getParentNode = function(domNode) {
+		var parent = domNode.parentNode;
+		if (parent && parent.toString() === '[object ShadowRoot]') {
+			parent = parent.host;
+		}
+		return parent;
+	};
+	helpers.getMaximumWidth = function(domNode) {
+		var container = helpers._getParentNode(domNode);
+		if (!container) {
+			return domNode.clientWidth;
+		}
+
+		var clientWidth = container.clientWidth;
+		var paddingLeft = helpers._calculatePadding(container, 'padding-left', clientWidth);
+		var paddingRight = helpers._calculatePadding(container, 'padding-right', clientWidth);
+
+		var w = clientWidth - paddingLeft - paddingRight;
+		var cw = helpers.getConstraintWidth(domNode);
+		return isNaN(cw) ? w : Math.min(w, cw);
+	};
+	helpers.getMaximumHeight = function(domNode) {
+		var container = helpers._getParentNode(domNode);
+		if (!container) {
+			return domNode.clientHeight;
+		}
+
+		var clientHeight = container.clientHeight;
+		var paddingTop = helpers._calculatePadding(container, 'padding-top', clientHeight);
+		var paddingBottom = helpers._calculatePadding(container, 'padding-bottom', clientHeight);
+
+		var h = clientHeight - paddingTop - paddingBottom;
+		var ch = helpers.getConstraintHeight(domNode);
+		return isNaN(ch) ? h : Math.min(h, ch);
+	};
+	helpers.getStyle = function(el, property) {
+		return el.currentStyle ?
+			el.currentStyle[property] :
+			document.defaultView.getComputedStyle(el, null).getPropertyValue(property);
+	};
+	helpers.retinaScale = function(chart, forceRatio) {
+		var pixelRatio = chart.currentDevicePixelRatio = forceRatio || (typeof window !== 'undefined' && window.devicePixelRatio) || 1;
+		if (pixelRatio === 1) {
+			return;
+		}
+
+		var canvas = chart.canvas;
+		var height = chart.height;
+		var width = chart.width;
+
+		canvas.height = height * pixelRatio;
+		canvas.width = width * pixelRatio;
+		chart.ctx.scale(pixelRatio, pixelRatio);
+
+		// If no style has been set on the canvas, the render size is used as display size,
+		// making the chart visually bigger, so let's enforce it to the "correct" values.
+		// See https://github.com/chartjs/Chart.js/issues/3575
+		if (!canvas.style.height && !canvas.style.width) {
+			canvas.style.height = height + 'px';
+			canvas.style.width = width + 'px';
+		}
+	};
+	// -- Canvas methods
+	helpers.fontString = function(pixelSize, fontStyle, fontFamily) {
+		return fontStyle + ' ' + pixelSize + 'px ' + fontFamily;
+	};
+	helpers.longestText = function(ctx, font, arrayOfThings, cache) {
+		cache = cache || {};
+		var data = cache.data = cache.data || {};
+		var gc = cache.garbageCollect = cache.garbageCollect || [];
+
+		if (cache.font !== font) {
+			data = cache.data = {};
+			gc = cache.garbageCollect = [];
+			cache.font = font;
+		}
+
+		ctx.font = font;
+		var longest = 0;
+		var ilen = arrayOfThings.length;
+		var i, j, jlen, thing, nestedThing;
+		for (i = 0; i < ilen; i++) {
+			thing = arrayOfThings[i];
+
+			// Undefined strings and arrays should not be measured
+			if (thing !== undefined && thing !== null && helpers.isArray(thing) !== true) {
+				longest = helpers.measureText(ctx, data, gc, longest, thing);
+			} else if (helpers.isArray(thing)) {
+				// if it is an array lets measure each element
+				// to do maybe simplify this function a bit so we can do this more recursively?
+				for (j = 0, jlen = thing.length; j < jlen; j++) {
+					nestedThing = thing[j];
+					// Undefined strings and arrays should not be measured
+					if (nestedThing !== undefined && nestedThing !== null && !helpers.isArray(nestedThing)) {
+						longest = helpers.measureText(ctx, data, gc, longest, nestedThing);
+					}
+				}
+			}
+		}
+
+		var gcLen = gc.length / 2;
+		if (gcLen > arrayOfThings.length) {
+			for (i = 0; i < gcLen; i++) {
+				delete data[gc[i]];
+			}
+			gc.splice(0, gcLen);
+		}
+		return longest;
+	};
+	helpers.measureText = function(ctx, data, gc, longest, string) {
+		var textWidth = data[string];
+		if (!textWidth) {
+			textWidth = data[string] = ctx.measureText(string).width;
+			gc.push(string);
+		}
+		if (textWidth > longest) {
+			longest = textWidth;
+		}
+		return longest;
+	};
+
+	/**
+	 * @deprecated
+	 */
+	helpers.numberOfLabelLines = function(arrayOfThings) {
+		var numberOfLines = 1;
+		helpers.each(arrayOfThings, function(thing) {
+			if (helpers.isArray(thing)) {
+				if (thing.length > numberOfLines) {
+					numberOfLines = thing.length;
+				}
+			}
+		});
+		return numberOfLines;
+	};
+
+	helpers.color = !color ?
+		function(value) {
+			console.error('Color.js not found!');
+			return value;
+		} :
+		function(value) {
+			/* global CanvasGradient */
+			if (value instanceof CanvasGradient) {
+				value = defaults.global.defaultColor;
+			}
+
+			return color(value);
+		};
+
+	helpers.getHoverColor = function(colorValue) {
+		/* global CanvasPattern */
+		return (colorValue instanceof CanvasPattern || colorValue instanceof CanvasGradient) ?
+			colorValue :
+			helpers.color(colorValue).saturate(0.5).darken(0.1).rgbString();
+	};
+};

assets/chart/src/core/core.interaction.js

@@ -0,0 +1,303 @@
+'use strict';
+
+var helpers = require('../helpers/index');
+
+/**
+ * Helper function to get relative position for an event
+ * @param {Event|IEvent} event - The event to get the position for
+ * @param {Chart} chart - The chart
+ * @returns {object} the event position
+ */
+function getRelativePosition(e, chart) {
+	if (e.native) {
+		return {
+			x: e.x,
+			y: e.y
+		};
+	}
+
+	return helpers.getRelativePosition(e, chart);
+}
+
+/**
+ * Helper function to traverse all of the visible elements in the chart
+ * @param {Chart} chart - the chart
+ * @param {function} handler - the callback to execute for each visible item
+ */
+function parseVisibleItems(chart, handler) {
+	var metasets = chart._getSortedVisibleDatasetMetas();
+	var metadata, i, j, ilen, jlen, element;
+
+	for (i = 0, ilen = metasets.length; i < ilen; ++i) {
+		metadata = metasets[i].data;
+		for (j = 0, jlen = metadata.length; j < jlen; ++j) {
+			element = metadata[j];
+			if (!element._view.skip) {
+				handler(element);
+			}
+		}
+	}
+}
+
+/**
+ * Helper function to get the items that intersect the event position
+ * @param {ChartElement[]} items - elements to filter
+ * @param {object} position - the point to be nearest to
+ * @return {ChartElement[]} the nearest items
+ */
+function getIntersectItems(chart, position) {
+	var elements = [];
+
+	parseVisibleItems(chart, function(element) {
+		if (element.inRange(position.x, position.y)) {
+			elements.push(element);
+		}
+	});
+
+	return elements;
+}
+
+/**
+ * Helper function to get the items nearest to the event position considering all visible items in teh chart
+ * @param {Chart} chart - the chart to look at elements from
+ * @param {object} position - the point to be nearest to
+ * @param {boolean} intersect - if true, only consider items that intersect the position
+ * @param {function} distanceMetric - function to provide the distance between points
+ * @return {ChartElement[]} the nearest items
+ */
+function getNearestItems(chart, position, intersect, distanceMetric) {
+	var minDistance = Number.POSITIVE_INFINITY;
+	var nearestItems = [];
+
+	parseVisibleItems(chart, function(element) {
+		if (intersect && !element.inRange(position.x, position.y)) {
+			return;
+		}
+
+		var center = element.getCenterPoint();
+		var distance = distanceMetric(position, center);
+		if (distance < minDistance) {
+			nearestItems = [element];
+			minDistance = distance;
+		} else if (distance === minDistance) {
+			// Can have multiple items at the same distance in which case we sort by size
+			nearestItems.push(element);
+		}
+	});
+
+	return nearestItems;
+}
+
+/**
+ * Get a distance metric function for two points based on the
+ * axis mode setting
+ * @param {string} axis - the axis mode. x|y|xy
+ */
+function getDistanceMetricForAxis(axis) {
+	var useX = axis.indexOf('x') !== -1;
+	var useY = axis.indexOf('y') !== -1;
+
+	return function(pt1, pt2) {
+		var deltaX = useX ? Math.abs(pt1.x - pt2.x) : 0;
+		var deltaY = useY ? Math.abs(pt1.y - pt2.y) : 0;
+		return Math.sqrt(Math.pow(deltaX, 2) + Math.pow(deltaY, 2));
+	};
+}
+
+function indexMode(chart, e, options) {
+	var position = getRelativePosition(e, chart);
+	// Default axis for index mode is 'x' to match old behaviour
+	options.axis = options.axis || 'x';
+	var distanceMetric = getDistanceMetricForAxis(options.axis);
+	var items = options.intersect ? getIntersectItems(chart, position) : getNearestItems(chart, position, false, distanceMetric);
+	var elements = [];
+
+	if (!items.length) {
+		return [];
+	}
+
+	chart._getSortedVisibleDatasetMetas().forEach(function(meta) {
+		var element = meta.data[items[0]._index];
+
+		// don't count items that are skipped (null data)
+		if (element && !element._view.skip) {
+			elements.push(element);
+		}
+	});
+
+	return elements;
+}
+
+/**
+ * @interface IInteractionOptions
+ */
+/**
+ * If true, only consider items that intersect the point
+ * @name IInterfaceOptions#boolean
+ * @type Boolean
+ */
+
+/**
+ * Contains interaction related functions
+ * @namespace Chart.Interaction
+ */
+module.exports = {
+	// Helper function for different modes
+	modes: {
+		single: function(chart, e) {
+			var position = getRelativePosition(e, chart);
+			var elements = [];
+
+			parseVisibleItems(chart, function(element) {
+				if (element.inRange(position.x, position.y)) {
+					elements.push(element);
+					return elements;
+				}
+			});
+
+			return elements.slice(0, 1);
+		},
+
+		/**
+		 * @function Chart.Interaction.modes.label
+		 * @deprecated since version 2.4.0
+		 * @todo remove at version 3
+		 * @private
+		 */
+		label: indexMode,
+
+		/**
+		 * Returns items at the same index. If the options.intersect parameter is true, we only return items if we intersect something
+		 * If the options.intersect mode is false, we find the nearest item and return the items at the same index as that item
+		 * @function Chart.Interaction.modes.index
+		 * @since v2.4.0
+		 * @param {Chart} chart - the chart we are returning items from
+		 * @param {Event} e - the event we are find things at
+		 * @param {IInteractionOptions} options - options to use during interaction
+		 * @return {Chart.Element[]} Array of elements that are under the point. If none are found, an empty array is returned
+		 */
+		index: indexMode,
+
+		/**
+		 * Returns items in the same dataset. If the options.intersect parameter is true, we only return items if we intersect something
+		 * If the options.intersect is false, we find the nearest item and return the items in that dataset
+		 * @function Chart.Interaction.modes.dataset
+		 * @param {Chart} chart - the chart we are returning items from
+		 * @param {Event} e - the event we are find things at
+		 * @param {IInteractionOptions} options - options to use during interaction
+		 * @return {Chart.Element[]} Array of elements that are under the point. If none are found, an empty array is returned
+		 */
+		dataset: function(chart, e, options) {
+			var position = getRelativePosition(e, chart);
+			options.axis = options.axis || 'xy';
+			var distanceMetric = getDistanceMetricForAxis(options.axis);
+			var items = options.intersect ? getIntersectItems(chart, position) : getNearestItems(chart, position, false, distanceMetric);
+
+			if (items.length > 0) {
+				items = chart.getDatasetMeta(items[0]._datasetIndex).data;
+			}
+
+			return items;
+		},
+
+		/**
+		 * @function Chart.Interaction.modes.x-axis
+		 * @deprecated since version 2.4.0. Use index mode and intersect == true
+		 * @todo remove at version 3
+		 * @private
+		 */
+		'x-axis': function(chart, e) {
+			return indexMode(chart, e, {intersect: false});
+		},
+
+		/**
+		 * Point mode returns all elements that hit test based on the event position
+		 * of the event
+		 * @function Chart.Interaction.modes.intersect
+		 * @param {Chart} chart - the chart we are returning items from
+		 * @param {Event} e - the event we are find things at
+		 * @return {Chart.Element[]} Array of elements that are under the point. If none are found, an empty array is returned
+		 */
+		point: function(chart, e) {
+			var position = getRelativePosition(e, chart);
+			return getIntersectItems(chart, position);
+		},
+
+		/**
+		 * nearest mode returns the element closest to the point
+		 * @function Chart.Interaction.modes.intersect
+		 * @param {Chart} chart - the chart we are returning items from
+		 * @param {Event} e - the event we are find things at
+		 * @param {IInteractionOptions} options - options to use
+		 * @return {Chart.Element[]} Array of elements that are under the point. If none are found, an empty array is returned
+		 */
+		nearest: function(chart, e, options) {
+			var position = getRelativePosition(e, chart);
+			options.axis = options.axis || 'xy';
+			var distanceMetric = getDistanceMetricForAxis(options.axis);
+			return getNearestItems(chart, position, options.intersect, distanceMetric);
+		},
+
+		/**
+		 * x mode returns the elements that hit-test at the current x coordinate
+		 * @function Chart.Interaction.modes.x
+		 * @param {Chart} chart - the chart we are returning items from
+		 * @param {Event} e - the event we are find things at
+		 * @param {IInteractionOptions} options - options to use
+		 * @return {Chart.Element[]} Array of elements that are under the point. If none are found, an empty array is returned
+		 */
+		x: function(chart, e, options) {
+			var position = getRelativePosition(e, chart);
+			var items = [];
+			var intersectsItem = false;
+
+			parseVisibleItems(chart, function(element) {
+				if (element.inXRange(position.x)) {
+					items.push(element);
+				}
+
+				if (element.inRange(position.x, position.y)) {
+					intersectsItem = true;
+				}
+			});
+
+			// If we want to trigger on an intersect and we don't have any items
+			// that intersect the position, return nothing
+			if (options.intersect && !intersectsItem) {
+				items = [];
+			}
+			return items;
+		},
+
+		/**
+		 * y mode returns the elements that hit-test at the current y coordinate
+		 * @function Chart.Interaction.modes.y
+		 * @param {Chart} chart - the chart we are returning items from
+		 * @param {Event} e - the event we are find things at
+		 * @param {IInteractionOptions} options - options to use
+		 * @return {Chart.Element[]} Array of elements that are under the point. If none are found, an empty array is returned
+		 */
+		y: function(chart, e, options) {
+			var position = getRelativePosition(e, chart);
+			var items = [];
+			var intersectsItem = false;
+
+			parseVisibleItems(chart, function(element) {
+				if (element.inYRange(position.y)) {
+					items.push(element);
+				}
+
+				if (element.inRange(position.x, position.y)) {
+					intersectsItem = true;
+				}
+			});
+
+			// If we want to trigger on an intersect and we don't have any items
+			// that intersect the position, return nothing
+			if (options.intersect && !intersectsItem) {
+				items = [];
+			}
+			return items;
+		}
+	}
+};

assets/chart/src/core/core.layouts.js

@@ -0,0 +1,388 @@
+'use strict';
+
+var defaults = require('./core.defaults');
+var helpers = require('../helpers/index');
+
+var extend = helpers.extend;
+
+function filterByPosition(array, position) {
+	return helpers.where(array, function(v) {
+		return v.pos === position;
+	});
+}
+
+function sortByWeight(array, reverse) {
+	return array.sort(function(a, b) {
+		var v0 = reverse ? b : a;
+		var v1 = reverse ? a : b;
+		return v0.weight === v1.weight ?
+			v0.index - v1.index :
+			v0.weight - v1.weight;
+	});
+}
+
+function wrapBoxes(boxes) {
+	var layoutBoxes = [];
+	var i, ilen, box;
+
+	for (i = 0, ilen = (boxes || []).length; i < ilen; ++i) {
+		box = boxes[i];
+		layoutBoxes.push({
+			index: i,
+			box: box,
+			pos: box.position,
+			horizontal: box.isHorizontal(),
+			weight: box.weight
+		});
+	}
+	return layoutBoxes;
+}
+
+function setLayoutDims(layouts, params) {
+	var i, ilen, layout;
+	for (i = 0, ilen = layouts.length; i < ilen; ++i) {
+		layout = layouts[i];
+		// store width used instead of chartArea.w in fitBoxes
+		layout.width = layout.horizontal
+			? layout.box.fullWidth && params.availableWidth
+			: params.vBoxMaxWidth;
+		// store height used instead of chartArea.h in fitBoxes
+		layout.height = layout.horizontal && params.hBoxMaxHeight;
+	}
+}
+
+function buildLayoutBoxes(boxes) {
+	var layoutBoxes = wrapBoxes(boxes);
+	var left = sortByWeight(filterByPosition(layoutBoxes, 'left'), true);
+	var right = sortByWeight(filterByPosition(layoutBoxes, 'right'));
+	var top = sortByWeight(filterByPosition(layoutBoxes, 'top'), true);
+	var bottom = sortByWeight(filterByPosition(layoutBoxes, 'bottom'));
+
+	return {
+		leftAndTop: left.concat(top),
+		rightAndBottom: right.concat(bottom),
+		chartArea: filterByPosition(layoutBoxes, 'chartArea'),
+		vertical: left.concat(right),
+		horizontal: top.concat(bottom)
+	};
+}
+
+function getCombinedMax(maxPadding, chartArea, a, b) {
+	return Math.max(maxPadding[a], chartArea[a]) + Math.max(maxPadding[b], chartArea[b]);
+}
+
+function updateDims(chartArea, params, layout) {
+	var box = layout.box;
+	var maxPadding = chartArea.maxPadding;
+	var newWidth, newHeight;
+
+	if (layout.size) {
+		// this layout was already counted for, lets first reduce old size
+		chartArea[layout.pos] -= layout.size;
+	}
+	layout.size = layout.horizontal ? box.height : box.width;
+	chartArea[layout.pos] += layout.size;
+
+	if (box.getPadding) {
+		var boxPadding = box.getPadding();
+		maxPadding.top = Math.max(maxPadding.top, boxPadding.top);
+		maxPadding.left = Math.max(maxPadding.left, boxPadding.left);
+		maxPadding.bottom = Math.max(maxPadding.bottom, boxPadding.bottom);
+		maxPadding.right = Math.max(maxPadding.right, boxPadding.right);
+	}
+
+	newWidth = params.outerWidth - getCombinedMax(maxPadding, chartArea, 'left', 'right');
+	newHeight = params.outerHeight - getCombinedMax(maxPadding, chartArea, 'top', 'bottom');
+
+	if (newWidth !== chartArea.w || newHeight !== chartArea.h) {
+		chartArea.w = newWidth;
+		chartArea.h = newHeight;
+
+		// return true if chart area changed in layout's direction
+		return layout.horizontal ? newWidth !== chartArea.w : newHeight !== chartArea.h;
+	}
+}
+
+function handleMaxPadding(chartArea) {
+	var maxPadding = chartArea.maxPadding;
+
+	function updatePos(pos) {
+		var change = Math.max(maxPadding[pos] - chartArea[pos], 0);
+		chartArea[pos] += change;
+		return change;
+	}
+	chartArea.y += updatePos('top');
+	chartArea.x += updatePos('left');
+	updatePos('right');
+	updatePos('bottom');
+}
+
+function getMargins(horizontal, chartArea) {
+	var maxPadding = chartArea.maxPadding;
+
+	function marginForPositions(positions) {
+		var margin = {left: 0, top: 0, right: 0, bottom: 0};
+		positions.forEach(function(pos) {
+			margin[pos] = Math.max(chartArea[pos], maxPadding[pos]);
+		});
+		return margin;
+	}
+
+	return horizontal
+		? marginForPositions(['left', 'right'])
+		: marginForPositions(['top', 'bottom']);
+}
+
+function fitBoxes(boxes, chartArea, params) {
+	var refitBoxes = [];
+	var i, ilen, layout, box, refit, changed;
+
+	for (i = 0, ilen = boxes.length; i < ilen; ++i) {
+		layout = boxes[i];
+		box = layout.box;
+
+		box.update(
+			layout.width || chartArea.w,
+			layout.height || chartArea.h,
+			getMargins(layout.horizontal, chartArea)
+		);
+		if (updateDims(chartArea, params, layout)) {
+			changed = true;
+			if (refitBoxes.length) {
+				// Dimensions changed and there were non full width boxes before this
+				// -> we have to refit those
+				refit = true;
+			}
+		}
+		if (!box.fullWidth) { // fullWidth boxes don't need to be re-fitted in any case
+			refitBoxes.push(layout);
+		}
+	}
+
+	return refit ? fitBoxes(refitBoxes, chartArea, params) || changed : changed;
+}
+
+function placeBoxes(boxes, chartArea, params) {
+	var userPadding = params.padding;
+	var x = chartArea.x;
+	var y = chartArea.y;
+	var i, ilen, layout, box;
+
+	for (i = 0, ilen = boxes.length; i < ilen; ++i) {
+		layout = boxes[i];
+		box = layout.box;
+		if (layout.horizontal) {
+			box.left = box.fullWidth ? userPadding.left : chartArea.left;
+			box.right = box.fullWidth ? params.outerWidth - userPadding.right : chartArea.left + chartArea.w;
+			box.top = y;
+			box.bottom = y + box.height;
+			box.width = box.right - box.left;
+			y = box.bottom;
+		} else {
+			box.left = x;
+			box.right = x + box.width;
+			box.top = chartArea.top;
+			box.bottom = chartArea.top + chartArea.h;
+			box.height = box.bottom - box.top;
+			x = box.right;
+		}
+	}
+
+	chartArea.x = x;
+	chartArea.y = y;
+}
+
+defaults._set('global', {
+	layout: {
+		padding: {
+			top: 0,
+			right: 0,
+			bottom: 0,
+			left: 0
+		}
+	}
+});
+
+/**
+ * @interface ILayoutItem
+ * @prop {string} position - The position of the item in the chart layout. Possible values are
+ * 'left', 'top', 'right', 'bottom', and 'chartArea'
+ * @prop {number} weight - The weight used to sort the item. Higher weights are further away from the chart area
+ * @prop {boolean} fullWidth - if true, and the item is horizontal, then push vertical boxes down
+ * @prop {function} isHorizontal - returns true if the layout item is horizontal (ie. top or bottom)
+ * @prop {function} update - Takes two parameters: width and height. Returns size of item
+ * @prop {function} getPadding -  Returns an object with padding on the edges
+ * @prop {number} width - Width of item. Must be valid after update()
+ * @prop {number} height - Height of item. Must be valid after update()
+ * @prop {number} left - Left edge of the item. Set by layout system and cannot be used in update
+ * @prop {number} top - Top edge of the item. Set by layout system and cannot be used in update
+ * @prop {number} right - Right edge of the item. Set by layout system and cannot be used in update
+ * @prop {number} bottom - Bottom edge of the item. Set by layout system and cannot be used in update
+ */
+
+// The layout service is very self explanatory.  It's responsible for the layout within a chart.
+// Scales, Legends and Plugins all rely on the layout service and can easily register to be placed anywhere they need
+// It is this service's responsibility of carrying out that layout.
+module.exports = {
+	defaults: {},
+
+	/**
+	 * Register a box to a chart.
+	 * A box is simply a reference to an object that requires layout. eg. Scales, Legend, Title.
+	 * @param {Chart} chart - the chart to use
+	 * @param {ILayoutItem} item - the item to add to be layed out
+	 */
+	addBox: function(chart, item) {
+		if (!chart.boxes) {
+			chart.boxes = [];
+		}
+
+		// initialize item with default values
+		item.fullWidth = item.fullWidth || false;
+		item.position = item.position || 'top';
+		item.weight = item.weight || 0;
+		item._layers = item._layers || function() {
+			return [{
+				z: 0,
+				draw: function() {
+					item.draw.apply(item, arguments);
+				}
+			}];
+		};
+
+		chart.boxes.push(item);
+	},
+
+	/**
+	 * Remove a layoutItem from a chart
+	 * @param {Chart} chart - the chart to remove the box from
+	 * @param {ILayoutItem} layoutItem - the item to remove from the layout
+	 */
+	removeBox: function(chart, layoutItem) {
+		var index = chart.boxes ? chart.boxes.indexOf(layoutItem) : -1;
+		if (index !== -1) {
+			chart.boxes.splice(index, 1);
+		}
+	},
+
+	/**
+	 * Sets (or updates) options on the given `item`.
+	 * @param {Chart} chart - the chart in which the item lives (or will be added to)
+	 * @param {ILayoutItem} item - the item to configure with the given options
+	 * @param {object} options - the new item options.
+	 */
+	configure: function(chart, item, options) {
+		var props = ['fullWidth', 'position', 'weight'];
+		var ilen = props.length;
+		var i = 0;
+		var prop;
+
+		for (; i < ilen; ++i) {
+			prop = props[i];
+			if (options.hasOwnProperty(prop)) {
+				item[prop] = options[prop];
+			}
+		}
+	},
+
+	/**
+	 * Fits boxes of the given chart into the given size by having each box measure itself
+	 * then running a fitting algorithm
+	 * @param {Chart} chart - the chart
+	 * @param {number} width - the width to fit into
+	 * @param {number} height - the height to fit into
+	 */
+	update: function(chart, width, height) {
+		if (!chart) {
+			return;
+		}
+
+		var layoutOptions = chart.options.layout || {};
+		var padding = helpers.options.toPadding(layoutOptions.padding);
+
+		var availableWidth = width - padding.width;
+		var availableHeight = height - padding.height;
+		var boxes = buildLayoutBoxes(chart.boxes);
+		var verticalBoxes = boxes.vertical;
+		var horizontalBoxes = boxes.horizontal;
+
+		// Essentially we now have any number of boxes on each of the 4 sides.
+		// Our canvas looks like the following.
+		// The areas L1 and L2 are the left axes. R1 is the right axis, T1 is the top axis and
+		// B1 is the bottom axis
+		// There are also 4 quadrant-like locations (left to right instead of clockwise) reserved for chart overlays
+		// These locations are single-box locations only, when trying to register a chartArea location that is already taken,
+		// an error will be thrown.
+		//
+		// |----------------------------------------------------|
+		// |                  T1 (Full Width)                   |
+		// |----------------------------------------------------|
+		// |    |    |                 T2                  |    |
+		// |    |----|-------------------------------------|----|
+		// |    |    | C1 |                           | C2 |    |
+		// |    |    |----|                           |----|    |
+		// |    |    |                                     |    |
+		// | L1 | L2 |           ChartArea (C0)            | R1 |
+		// |    |    |                                     |    |
+		// |    |    |----|                           |----|    |
+		// |    |    | C3 |                           | C4 |    |
+		// |    |----|-------------------------------------|----|
+		// |    |    |                 B1                  |    |
+		// |----------------------------------------------------|
+		// |                  B2 (Full Width)                   |
+		// |----------------------------------------------------|
+		//
+
+		var params = Object.freeze({
+			outerWidth: width,
+			outerHeight: height,
+			padding: padding,
+			availableWidth: availableWidth,
+			vBoxMaxWidth: availableWidth / 2 / verticalBoxes.length,
+			hBoxMaxHeight: availableHeight / 2
+		});
+		var chartArea = extend({
+			maxPadding: extend({}, padding),
+			w: availableWidth,
+			h: availableHeight,
+			x: padding.left,
+			y: padding.top
+		}, padding);
+
+		setLayoutDims(verticalBoxes.concat(horizontalBoxes), params);
+
+		// First fit vertical boxes
+		fitBoxes(verticalBoxes, chartArea, params);
+
+		// Then fit horizontal boxes
+		if (fitBoxes(horizontalBoxes, chartArea, params)) {
+			// if the area changed, re-fit vertical boxes
+			fitBoxes(verticalBoxes, chartArea, params);
+		}
+
+		handleMaxPadding(chartArea, params);
+
+		// Finally place the boxes to correct coordinates
+		placeBoxes(boxes.leftAndTop, chartArea, params);
+
+		// Move to opposite side of chart
+		chartArea.x += chartArea.w;
+		chartArea.y += chartArea.h;
+
+		placeBoxes(boxes.rightAndBottom, chartArea, params);
+
+		chart.chartArea = {
+			left: chartArea.left,
+			top: chartArea.top,
+			right: chartArea.left + chartArea.w,
+			bottom: chartArea.top + chartArea.h
+		};
+
+		// Finally update boxes in chartArea (radial scale for example)
+		helpers.each(boxes.chartArea, function(layout) {
+			var box = layout.box;
+			extend(box, chart.chartArea);
+			box.update(chartArea.w, chartArea.h);
+		});
+	}
+};

assets/chart/src/core/core.plugins.js

@@ -0,0 +1,382 @@
+'use strict';
+
+var defaults = require('./core.defaults');
+var helpers = require('../helpers/index');
+
+defaults._set('global', {
+	plugins: {}
+});
+
+/**
+ * The plugin service singleton
+ * @namespace Chart.plugins
+ * @since 2.1.0
+ */
+module.exports = {
+	/**
+	 * Globally registered plugins.
+	 * @private
+	 */
+	_plugins: [],
+
+	/**
+	 * This identifier is used to invalidate the descriptors cache attached to each chart
+	 * when a global plugin is registered or unregistered. In this case, the cache ID is
+	 * incremented and descriptors are regenerated during following API calls.
+	 * @private
+	 */
+	_cacheId: 0,
+
+	/**
+	 * Registers the given plugin(s) if not already registered.
+	 * @param {IPlugin[]|IPlugin} plugins plugin instance(s).
+	 */
+	register: function(plugins) {
+		var p = this._plugins;
+		([]).concat(plugins).forEach(function(plugin) {
+			if (p.indexOf(plugin) === -1) {
+				p.push(plugin);
+			}
+		});
+
+		this._cacheId++;
+	},
+
+	/**
+	 * Unregisters the given plugin(s) only if registered.
+	 * @param {IPlugin[]|IPlugin} plugins plugin instance(s).
+	 */
+	unregister: function(plugins) {
+		var p = this._plugins;
+		([]).concat(plugins).forEach(function(plugin) {
+			var idx = p.indexOf(plugin);
+			if (idx !== -1) {
+				p.splice(idx, 1);
+			}
+		});
+
+		this._cacheId++;
+	},
+
+	/**
+	 * Remove all registered plugins.
+	 * @since 2.1.5
+	 */
+	clear: function() {
+		this._plugins = [];
+		this._cacheId++;
+	},
+
+	/**
+	 * Returns the number of registered plugins?
+	 * @returns {number}
+	 * @since 2.1.5
+	 */
+	count: function() {
+		return this._plugins.length;
+	},
+
+	/**
+	 * Returns all registered plugin instances.
+	 * @returns {IPlugin[]} array of plugin objects.
+	 * @since 2.1.5
+	 */
+	getAll: function() {
+		return this._plugins;
+	},
+
+	/**
+	 * Calls enabled plugins for `chart` on the specified hook and with the given args.
+	 * This method immediately returns as soon as a plugin explicitly returns false. The
+	 * returned value can be used, for instance, to interrupt the current action.
+	 * @param {Chart} chart - The chart instance for which plugins should be called.
+	 * @param {string} hook - The name of the plugin method to call (e.g. 'beforeUpdate').
+	 * @param {Array} [args] - Extra arguments to apply to the hook call.
+	 * @returns {boolean} false if any of the plugins return false, else returns true.
+	 */
+	notify: function(chart, hook, args) {
+		var descriptors = this.descriptors(chart);
+		var ilen = descriptors.length;
+		var i, descriptor, plugin, params, method;
+
+		for (i = 0; i < ilen; ++i) {
+			descriptor = descriptors[i];
+			plugin = descriptor.plugin;
+			method = plugin[hook];
+			if (typeof method === 'function') {
+				params = [chart].concat(args || []);
+				params.push(descriptor.options);
+				if (method.apply(plugin, params) === false) {
+					return false;
+				}
+			}
+		}
+
+		return true;
+	},
+
+	/**
+	 * Returns descriptors of enabled plugins for the given chart.
+	 * @returns {object[]} [{ plugin, options }]
+	 * @private
+	 */
+	descriptors: function(chart) {
+		var cache = chart.$plugins || (chart.$plugins = {});
+		if (cache.id === this._cacheId) {
+			return cache.descriptors;
+		}
+
+		var plugins = [];
+		var descriptors = [];
+		var config = (chart && chart.config) || {};
+		var options = (config.options && config.options.plugins) || {};
+
+		this._plugins.concat(config.plugins || []).forEach(function(plugin) {
+			var idx = plugins.indexOf(plugin);
+			if (idx !== -1) {
+				return;
+			}
+
+			var id = plugin.id;
+			var opts = options[id];
+			if (opts === false) {
+				return;
+			}
+
+			if (opts === true) {
+				opts = helpers.clone(defaults.global.plugins[id]);
+			}
+
+			plugins.push(plugin);
+			descriptors.push({
+				plugin: plugin,
+				options: opts || {}
+			});
+		});
+
+		cache.descriptors = descriptors;
+		cache.id = this._cacheId;
+		return descriptors;
+	},
+
+	/**
+	 * Invalidates cache for the given chart: descriptors hold a reference on plugin option,
+	 * but in some cases, this reference can be changed by the user when updating options.
+	 * https://github.com/chartjs/Chart.js/issues/5111#issuecomment-355934167
+	 * @private
+	 */
+	_invalidate: function(chart) {
+		delete chart.$plugins;
+	}
+};
+
+/**
+ * Plugin extension hooks.
+ * @interface IPlugin
+ * @since 2.1.0
+ */
+/**
+ * @method IPlugin#beforeInit
+ * @desc Called before initializing `chart`.
+ * @param {Chart.Controller} chart - The chart instance.
+ * @param {object} options - The plugin options.
+ */
+/**
+ * @method IPlugin#afterInit
+ * @desc Called after `chart` has been initialized and before the first update.
+ * @param {Chart.Controller} chart - The chart instance.
+ * @param {object} options - The plugin options.
+ */
+/**
+ * @method IPlugin#beforeUpdate
+ * @desc Called before updating `chart`. If any plugin returns `false`, the update
+ * is cancelled (and thus subsequent render(s)) until another `update` is triggered.
+ * @param {Chart.Controller} chart - The chart instance.
+ * @param {object} options - The plugin options.
+ * @returns {boolean} `false` to cancel the chart update.
+ */
+/**
+ * @method IPlugin#afterUpdate
+ * @desc Called after `chart` has been updated and before rendering. Note that this
+ * hook will not be called if the chart update has been previously cancelled.
+ * @param {Chart.Controller} chart - The chart instance.
+ * @param {object} options - The plugin options.
+ */
+/**
+ * @method IPlugin#beforeDatasetsUpdate
+ * @desc Called before updating the `chart` datasets. If any plugin returns `false`,
+ * the datasets update is cancelled until another `update` is triggered.
+ * @param {Chart.Controller} chart - The chart instance.
+ * @param {object} options - The plugin options.
+ * @returns {boolean} false to cancel the datasets update.
+ * @since version 2.1.5
+*/
+/**
+ * @method IPlugin#afterDatasetsUpdate
+ * @desc Called after the `chart` datasets have been updated. Note that this hook
+ * will not be called if the datasets update has been previously cancelled.
+ * @param {Chart.Controller} chart - The chart instance.
+ * @param {object} options - The plugin options.
+ * @since version 2.1.5
+ */
+/**
+ * @method IPlugin#beforeDatasetUpdate
+ * @desc Called before updating the `chart` dataset at the given `args.index`. If any plugin
+ * returns `false`, the datasets update is cancelled until another `update` is triggered.
+ * @param {Chart} chart - The chart instance.
+ * @param {object} args - The call arguments.
+ * @param {number} args.index - The dataset index.
+ * @param {object} args.meta - The dataset metadata.
+ * @param {object} options - The plugin options.
+ * @returns {boolean} `false` to cancel the chart datasets drawing.
+ */
+/**
+ * @method IPlugin#afterDatasetUpdate
+ * @desc Called after the `chart` datasets at the given `args.index` has been updated. Note
+ * that this hook will not be called if the datasets update has been previously cancelled.
+ * @param {Chart} chart - The chart instance.
+ * @param {object} args - The call arguments.
+ * @param {number} args.index - The dataset index.
+ * @param {object} args.meta - The dataset metadata.
+ * @param {object} options - The plugin options.
+ */
+/**
+ * @method IPlugin#beforeLayout
+ * @desc Called before laying out `chart`. If any plugin returns `false`,
+ * the layout update is cancelled until another `update` is triggered.
+ * @param {Chart.Controller} chart - The chart instance.
+ * @param {object} options - The plugin options.
+ * @returns {boolean} `false` to cancel the chart layout.
+ */
+/**
+ * @method IPlugin#afterLayout
+ * @desc Called after the `chart` has been layed out. Note that this hook will not
+ * be called if the layout update has been previously cancelled.
+ * @param {Chart.Controller} chart - The chart instance.
+ * @param {object} options - The plugin options.
+ */
+/**
+ * @method IPlugin#beforeRender
+ * @desc Called before rendering `chart`. If any plugin returns `false`,
+ * the rendering is cancelled until another `render` is triggered.
+ * @param {Chart.Controller} chart - The chart instance.
+ * @param {object} options - The plugin options.
+ * @returns {boolean} `false` to cancel the chart rendering.
+ */
+/**
+ * @method IPlugin#afterRender
+ * @desc Called after the `chart` has been fully rendered (and animation completed). Note
+ * that this hook will not be called if the rendering has been previously cancelled.
+ * @param {Chart.Controller} chart - The chart instance.
+ * @param {object} options - The plugin options.
+ */
+/**
+ * @method IPlugin#beforeDraw
+ * @desc Called before drawing `chart` at every animation frame specified by the given
+ * easing value. If any plugin returns `false`, the frame drawing is cancelled until
+ * another `render` is triggered.
+ * @param {Chart.Controller} chart - The chart instance.
+ * @param {number} easingValue - The current animation value, between 0.0 and 1.0.
+ * @param {object} options - The plugin options.
+ * @returns {boolean} `false` to cancel the chart drawing.
+ */
+/**
+ * @method IPlugin#afterDraw
+ * @desc Called after the `chart` has been drawn for the specific easing value. Note
+ * that this hook will not be called if the drawing has been previously cancelled.
+ * @param {Chart.Controller} chart - The chart instance.
+ * @param {number} easingValue - The current animation value, between 0.0 and 1.0.
+ * @param {object} options - The plugin options.
+ */
+/**
+ * @method IPlugin#beforeDatasetsDraw
+ * @desc Called before drawing the `chart` datasets. If any plugin returns `false`,
+ * the datasets drawing is cancelled until another `render` is triggered.
+ * @param {Chart.Controller} chart - The chart instance.
+ * @param {number} easingValue - The current animation value, between 0.0 and 1.0.
+ * @param {object} options - The plugin options.
+ * @returns {boolean} `false` to cancel the chart datasets drawing.
+ */
+/**
+ * @method IPlugin#afterDatasetsDraw
+ * @desc Called after the `chart` datasets have been drawn. Note that this hook
+ * will not be called if the datasets drawing has been previously cancelled.
+ * @param {Chart.Controller} chart - The chart instance.
+ * @param {number} easingValue - The current animation value, between 0.0 and 1.0.
+ * @param {object} options - The plugin options.
+ */
+/**
+ * @method IPlugin#beforeDatasetDraw
+ * @desc Called before drawing the `chart` dataset at the given `args.index` (datasets
+ * are drawn in the reverse order). If any plugin returns `false`, the datasets drawing
+ * is cancelled until another `render` is triggered.
+ * @param {Chart} chart - The chart instance.
+ * @param {object} args - The call arguments.
+ * @param {number} args.index - The dataset index.
+ * @param {object} args.meta - The dataset metadata.
+ * @param {number} args.easingValue - The current animation value, between 0.0 and 1.0.
+ * @param {object} options - The plugin options.
+ * @returns {boolean} `false` to cancel the chart datasets drawing.
+ */
+/**
+ * @method IPlugin#afterDatasetDraw
+ * @desc Called after the `chart` datasets at the given `args.index` have been drawn
+ * (datasets are drawn in the reverse order). Note that this hook will not be called
+ * if the datasets drawing has been previously cancelled.
+ * @param {Chart} chart - The chart instance.
+ * @param {object} args - The call arguments.
+ * @param {number} args.index - The dataset index.
+ * @param {object} args.meta - The dataset metadata.
+ * @param {number} args.easingValue - The current animation value, between 0.0 and 1.0.
+ * @param {object} options - The plugin options.
+ */
+/**
+ * @method IPlugin#beforeTooltipDraw
+ * @desc Called before drawing the `tooltip`. If any plugin returns `false`,
+ * the tooltip drawing is cancelled until another `render` is triggered.
+ * @param {Chart} chart - The chart instance.
+ * @param {object} args - The call arguments.
+ * @param {Tooltip} args.tooltip - The tooltip.
+ * @param {number} args.easingValue - The current animation value, between 0.0 and 1.0.
+ * @param {object} options - The plugin options.
+ * @returns {boolean} `false` to cancel the chart tooltip drawing.
+ */
+/**
+ * @method IPlugin#afterTooltipDraw
+ * @desc Called after drawing the `tooltip`. Note that this hook will not
+ * be called if the tooltip drawing has been previously cancelled.
+ * @param {Chart} chart - The chart instance.
+ * @param {object} args - The call arguments.
+ * @param {Tooltip} args.tooltip - The tooltip.
+ * @param {number} args.easingValue - The current animation value, between 0.0 and 1.0.
+ * @param {object} options - The plugin options.
+ */
+/**
+ * @method IPlugin#beforeEvent
+ * @desc Called before processing the specified `event`. If any plugin returns `false`,
+ * the event will be discarded.
+ * @param {Chart.Controller} chart - The chart instance.
+ * @param {IEvent} event - The event object.
+ * @param {object} options - The plugin options.
+ */
+/**
+ * @method IPlugin#afterEvent
+ * @desc Called after the `event` has been consumed. Note that this hook
+ * will not be called if the `event` has been previously discarded.
+ * @param {Chart.Controller} chart - The chart instance.
+ * @param {IEvent} event - The event object.
+ * @param {object} options - The plugin options.
+ */
+/**
+ * @method IPlugin#resize
+ * @desc Called after the chart as been resized.
+ * @param {Chart.Controller} chart - The chart instance.
+ * @param {number} size - The new canvas display size (eq. canvas.style width & height).
+ * @param {object} options - The plugin options.
+ */
+/**
+ * @method IPlugin#destroy
+ * @desc Called after the chart as been destroyed.
+ * @param {Chart.Controller} chart - The chart instance.
+ * @param {object} options - The plugin options.
+ */

assets/chart/src/core/core.scaleService.js

@@ -0,0 +1,43 @@
+'use strict';
+
+var defaults = require('./core.defaults');
+var helpers = require('../helpers/index');
+var layouts = require('./core.layouts');
+
+module.exports = {
+	// Scale registration object. Extensions can register new scale types (such as log or DB scales) and then
+	// use the new chart options to grab the correct scale
+	constructors: {},
+	// Use a registration function so that we can move to an ES6 map when we no longer need to support
+	// old browsers
+
+	// Scale config defaults
+	defaults: {},
+	registerScaleType: function(type, scaleConstructor, scaleDefaults) {
+		this.constructors[type] = scaleConstructor;
+		this.defaults[type] = helpers.clone(scaleDefaults);
+	},
+	getScaleConstructor: function(type) {
+		return this.constructors.hasOwnProperty(type) ? this.constructors[type] : undefined;
+	},
+	getScaleDefaults: function(type) {
+		// Return the scale defaults merged with the global settings so that we always use the latest ones
+		return this.defaults.hasOwnProperty(type) ? helpers.merge({}, [defaults.scale, this.defaults[type]]) : {};
+	},
+	updateScaleDefaults: function(type, additions) {
+		var me = this;
+		if (me.defaults.hasOwnProperty(type)) {
+			me.defaults[type] = helpers.extend(me.defaults[type], additions);
+		}
+	},
+	addScalesToLayout: function(chart) {
+		// Adds each scale to the chart.boxes array to be sized accordingly
+		helpers.each(chart.scales, function(scale) {
+			// Set ILayoutItem parameters for backwards compatibility
+			scale.fullWidth = scale.options.fullWidth;
+			scale.position = scale.options.position;
+			scale.weight = scale.options.weight;
+			layouts.addBox(chart, scale);
+		});
+	}
+};

assets/chart/src/core/core.ticks.js

@@ -0,0 +1,78 @@
+'use strict';
+
+var helpers = require('../helpers/index');
+
+/**
+ * Namespace to hold static tick generation functions
+ * @namespace Chart.Ticks
+ */
+module.exports = {
+	/**
+	 * Namespace to hold formatters for different types of ticks
+	 * @namespace Chart.Ticks.formatters
+	 */
+	formatters: {
+		/**
+		 * Formatter for value labels
+		 * @method Chart.Ticks.formatters.values
+		 * @param value the value to display
+		 * @return {string|string[]} the label to display
+		 */
+		values: function(value) {
+			return helpers.isArray(value) ? value : '' + value;
+		},
+
+		/**
+		 * Formatter for linear numeric ticks
+		 * @method Chart.Ticks.formatters.linear
+		 * @param tickValue {number} the value to be formatted
+		 * @param index {number} the position of the tickValue parameter in the ticks array
+		 * @param ticks {number[]} the list of ticks being converted
+		 * @return {string} string representation of the tickValue parameter
+		 */
+		linear: function(tickValue, index, ticks) {
+			// If we have lots of ticks, don't use the ones
+			var delta = ticks.length > 3 ? ticks[2] - ticks[1] : ticks[1] - ticks[0];
+
+			// If we have a number like 2.5 as the delta, figure out how many decimal places we need
+			if (Math.abs(delta) > 1) {
+				if (tickValue !== Math.floor(tickValue)) {
+					// not an integer
+					delta = tickValue - Math.floor(tickValue);
+				}
+			}
+
+			var logDelta = helpers.log10(Math.abs(delta));
+			var tickString = '';
+
+			if (tickValue !== 0) {
+				var maxTick = Math.max(Math.abs(ticks[0]), Math.abs(ticks[ticks.length - 1]));
+				if (maxTick < 1e-4) { // all ticks are small numbers; use scientific notation
+					var logTick = helpers.log10(Math.abs(tickValue));
+					var numExponential = Math.floor(logTick) - Math.floor(logDelta);
+					numExponential = Math.max(Math.min(numExponential, 20), 0);
+					tickString = tickValue.toExponential(numExponential);
+				} else {
+					var numDecimal = -1 * Math.floor(logDelta);
+					numDecimal = Math.max(Math.min(numDecimal, 20), 0); // toFixed has a max of 20 decimal places
+					tickString = tickValue.toFixed(numDecimal);
+				}
+			} else {
+				tickString = '0'; // never show decimal places for 0
+			}
+
+			return tickString;
+		},
+
+		logarithmic: function(tickValue, index, ticks) {
+			var remain = tickValue / (Math.pow(10, Math.floor(helpers.log10(tickValue))));
+
+			if (tickValue === 0) {
+				return '0';
+			} else if (remain === 1 || remain === 2 || remain === 5 || index === 0 || index === ticks.length - 1) {
+				return tickValue.toExponential();
+			}
+			return '';
+		}
+	}
+};

assets/chart/src/elements/element.arc.js

@@ -0,0 +1,207 @@
+'use strict';
+
+var defaults = require('../core/core.defaults');
+var Element = require('../core/core.element');
+var helpers = require('../helpers/index');
+var TAU = Math.PI * 2;
+
+defaults._set('global', {
+	elements: {
+		arc: {
+			backgroundColor: defaults.global.defaultColor,
+			borderColor: '#fff',
+			borderWidth: 2,
+			borderAlign: 'center'
+		}
+	}
+});
+
+function clipArc(ctx, arc) {
+	var startAngle = arc.startAngle;
+	var endAngle = arc.endAngle;
+	var pixelMargin = arc.pixelMargin;
+	var angleMargin = pixelMargin / arc.outerRadius;
+	var x = arc.x;
+	var y = arc.y;
+
+	// Draw an inner border by cliping the arc and drawing a double-width border
+	// Enlarge the clipping arc by 0.33 pixels to eliminate glitches between borders
+	ctx.beginPath();
+	ctx.arc(x, y, arc.outerRadius, startAngle - angleMargin, endAngle + angleMargin);
+	if (arc.innerRadius > pixelMargin) {
+		angleMargin = pixelMargin / arc.innerRadius;
+		ctx.arc(x, y, arc.innerRadius - pixelMargin, endAngle + angleMargin, startAngle - angleMargin, true);
+	} else {
+		ctx.arc(x, y, pixelMargin, endAngle + Math.PI / 2, startAngle - Math.PI / 2);
+	}
+	ctx.closePath();
+	ctx.clip();
+}
+
+function drawFullCircleBorders(ctx, vm, arc, inner) {
+	var endAngle = arc.endAngle;
+	var i;
+
+	if (inner) {
+		arc.endAngle = arc.startAngle + TAU;
+		clipArc(ctx, arc);
+		arc.endAngle = endAngle;
+		if (arc.endAngle === arc.startAngle && arc.fullCircles) {
+			arc.endAngle += TAU;
+			arc.fullCircles--;
+		}
+	}
+
+	ctx.beginPath();
+	ctx.arc(arc.x, arc.y, arc.innerRadius, arc.startAngle + TAU, arc.startAngle, true);
+	for (i = 0; i < arc.fullCircles; ++i) {
+		ctx.stroke();
+	}
+
+	ctx.beginPath();
+	ctx.arc(arc.x, arc.y, vm.outerRadius, arc.startAngle, arc.startAngle + TAU);
+	for (i = 0; i < arc.fullCircles; ++i) {
+		ctx.stroke();
+	}
+}
+
+function drawBorder(ctx, vm, arc) {
+	var inner = vm.borderAlign === 'inner';
+
+	if (inner) {
+		ctx.lineWidth = vm.borderWidth * 2;
+		ctx.lineJoin = 'round';
+	} else {
+		ctx.lineWidth = vm.borderWidth;
+		ctx.lineJoin = 'bevel';
+	}
+
+	if (arc.fullCircles) {
+		drawFullCircleBorders(ctx, vm, arc, inner);
+	}
+
+	if (inner) {
+		clipArc(ctx, arc);
+	}
+
+	ctx.beginPath();
+	ctx.arc(arc.x, arc.y, vm.outerRadius, arc.startAngle, arc.endAngle);
+	ctx.arc(arc.x, arc.y, arc.innerRadius, arc.endAngle, arc.startAngle, true);
+	ctx.closePath();
+	ctx.stroke();
+}
+
+module.exports = Element.extend({
+	_type: 'arc',
+
+	inLabelRange: function(mouseX) {
+		var vm = this._view;
+
+		if (vm) {
+			return (Math.pow(mouseX - vm.x, 2) < Math.pow(vm.radius + vm.hoverRadius, 2));
+		}
+		return false;
+	},
+
+	inRange: function(chartX, chartY) {
+		var vm = this._view;
+
+		if (vm) {
+			var pointRelativePosition = helpers.getAngleFromPoint(vm, {x: chartX, y: chartY});
+			var angle = pointRelativePosition.angle;
+			var distance = pointRelativePosition.distance;
+
+			// Sanitise angle range
+			var startAngle = vm.startAngle;
+			var endAngle = vm.endAngle;
+			while (endAngle < startAngle) {
+				endAngle += TAU;
+			}
+			while (angle > endAngle) {
+				angle -= TAU;
+			}
+			while (angle < startAngle) {
+				angle += TAU;
+			}
+
+			// Check if within the range of the open/close angle
+			var betweenAngles = (angle >= startAngle && angle <= endAngle);
+			var withinRadius = (distance >= vm.innerRadius && distance <= vm.outerRadius);
+
+			return (betweenAngles && withinRadius);
+		}
+		return false;
+	},
+
+	getCenterPoint: function() {
+		var vm = this._view;
+		var halfAngle = (vm.startAngle + vm.endAngle) / 2;
+		var halfRadius = (vm.innerRadius + vm.outerRadius) / 2;
+		return {
+			x: vm.x + Math.cos(halfAngle) * halfRadius,
+			y: vm.y + Math.sin(halfAngle) * halfRadius
+		};
+	},
+
+	getArea: function() {
+		var vm = this._view;
+		return Math.PI * ((vm.endAngle - vm.startAngle) / (2 * Math.PI)) * (Math.pow(vm.outerRadius, 2) - Math.pow(vm.innerRadius, 2));
+	},
+
+	tooltipPosition: function() {
+		var vm = this._view;
+		var centreAngle = vm.startAngle + ((vm.endAngle - vm.startAngle) / 2);
+		var rangeFromCentre = (vm.outerRadius - vm.innerRadius) / 2 + vm.innerRadius;
+
+		return {
+			x: vm.x + (Math.cos(centreAngle) * rangeFromCentre),
+			y: vm.y + (Math.sin(centreAngle) * rangeFromCentre)
+		};
+	},
+
+	draw: function() {
+		var ctx = this._chart.ctx;
+		var vm = this._view;
+		var pixelMargin = (vm.borderAlign === 'inner') ? 0.33 : 0;
+		var arc = {
+			x: vm.x,
+			y: vm.y,
+			innerRadius: vm.innerRadius,
+			outerRadius: Math.max(vm.outerRadius - pixelMargin, 0),
+			pixelMargin: pixelMargin,
+			startAngle: vm.startAngle,
+			endAngle: vm.endAngle,
+			fullCircles: Math.floor(vm.circumference / TAU)
+		};
+		var i;
+
+		ctx.save();
+
+		ctx.fillStyle = vm.backgroundColor;
+		ctx.strokeStyle = vm.borderColor;
+
+		if (arc.fullCircles) {
+			arc.endAngle = arc.startAngle + TAU;
+			ctx.beginPath();
+			ctx.arc(arc.x, arc.y, arc.outerRadius, arc.startAngle, arc.endAngle);
+			ctx.arc(arc.x, arc.y, arc.innerRadius, arc.endAngle, arc.startAngle, true);
+			ctx.closePath();
+			for (i = 0; i < arc.fullCircles; ++i) {
+				ctx.fill();
+			}
+			arc.endAngle = arc.startAngle + vm.circumference % TAU;
+		}
+
+		ctx.beginPath();
+		ctx.arc(arc.x, arc.y, arc.outerRadius, arc.startAngle, arc.endAngle);
+		ctx.arc(arc.x, arc.y, arc.innerRadius, arc.endAngle, arc.startAngle, true);
+		ctx.closePath();
+		ctx.fill();
+
+		if (vm.borderWidth) {
+			drawBorder(ctx, vm, arc);
+		}
+
+		ctx.restore();
+	}
+});

assets/chart/src/elements/element.line.js

@@ -0,0 +1,111 @@
+'use strict';
+
+var defaults = require('../core/core.defaults');
+var Element = require('../core/core.element');
+var helpers = require('../helpers/index');
+
+var valueOrDefault = helpers.valueOrDefault;
+
+var defaultColor = defaults.global.defaultColor;
+
+defaults._set('global', {
+	elements: {
+		line: {
+			tension: 0.4,
+			backgroundColor: defaultColor,
+			borderWidth: 3,
+			borderColor: defaultColor,
+			borderCapStyle: 'butt',
+			borderDash: [],
+			borderDashOffset: 0.0,
+			borderJoinStyle: 'miter',
+			capBezierPoints: true,
+			fill: true, // do we fill in the area between the line and its base axis
+		}
+	}
+});
+
+module.exports = Element.extend({
+	_type: 'line',
+
+	draw: function() {
+		var me = this;
+		var vm = me._view;
+		var ctx = me._chart.ctx;
+		var spanGaps = vm.spanGaps;
+		var points = me._children.slice(); // clone array
+		var globalDefaults = defaults.global;
+		var globalOptionLineElements = globalDefaults.elements.line;
+		var lastDrawnIndex = -1;
+		var closePath = me._loop;
+		var index, previous, currentVM;
+
+		if (!points.length) {
+			return;
+		}
+
+		if (me._loop) {
+			for (index = 0; index < points.length; ++index) {
+				previous = helpers.previousItem(points, index);
+				// If the line has an open path, shift the point array
+				if (!points[index]._view.skip && previous._view.skip) {
+					points = points.slice(index).concat(points.slice(0, index));
+					closePath = spanGaps;
+					break;
+				}
+			}
+			// If the line has a close path, add the first point again
+			if (closePath) {
+				points.push(points[0]);
+			}
+		}
+
+		ctx.save();
+
+		// Stroke Line Options
+		ctx.lineCap = vm.borderCapStyle || globalOptionLineElements.borderCapStyle;
+
+		// IE 9 and 10 do not support line dash
+		if (ctx.setLineDash) {
+			ctx.setLineDash(vm.borderDash || globalOptionLineElements.borderDash);
+		}
+
+		ctx.lineDashOffset = valueOrDefault(vm.borderDashOffset, globalOptionLineElements.borderDashOffset);
+		ctx.lineJoin = vm.borderJoinStyle || globalOptionLineElements.borderJoinStyle;
+		ctx.lineWidth = valueOrDefault(vm.borderWidth, globalOptionLineElements.borderWidth);
+		ctx.strokeStyle = vm.borderColor || globalDefaults.defaultColor;
+
+		// Stroke Line
+		ctx.beginPath();
+
+		// First point moves to it's starting position no matter what
+		currentVM = points[0]._view;
+		if (!currentVM.skip) {
+			ctx.moveTo(currentVM.x, currentVM.y);
+			lastDrawnIndex = 0;
+		}
+
+		for (index = 1; index < points.length; ++index) {
+			currentVM = points[index]._view;
+			previous = lastDrawnIndex === -1 ? helpers.previousItem(points, index) : points[lastDrawnIndex];
+
+			if (!currentVM.skip) {
+				if ((lastDrawnIndex !== (index - 1) && !spanGaps) || lastDrawnIndex === -1) {
+					// There was a gap and this is the first point after the gap
+					ctx.moveTo(currentVM.x, currentVM.y);
+				} else {
+					// Line to next point
+					helpers.canvas.lineTo(ctx, previous._view, currentVM);
+				}
+				lastDrawnIndex = index;
+			}
+		}
+
+		if (closePath) {
+			ctx.closePath();
+		}
+
+		ctx.stroke();
+		ctx.restore();
+	}
+});

assets/chart/src/elements/element.point.js

@@ -0,0 +1,93 @@
+'use strict';
+
+var defaults = require('../core/core.defaults');
+var Element = require('../core/core.element');
+var helpers = require('../helpers/index');
+
+var valueOrDefault = helpers.valueOrDefault;
+
+var defaultColor = defaults.global.defaultColor;
+
+defaults._set('global', {
+	elements: {
+		point: {
+			radius: 3,
+			pointStyle: 'circle',
+			backgroundColor: defaultColor,
+			borderColor: defaultColor,
+			borderWidth: 1,
+			// Hover
+			hitRadius: 1,
+			hoverRadius: 4,
+			hoverBorderWidth: 1
+		}
+	}
+});
+
+function xRange(mouseX) {
+	var vm = this._view;
+	return vm ? (Math.abs(mouseX - vm.x) < vm.radius + vm.hitRadius) : false;
+}
+
+function yRange(mouseY) {
+	var vm = this._view;
+	return vm ? (Math.abs(mouseY - vm.y) < vm.radius + vm.hitRadius) : false;
+}
+
+module.exports = Element.extend({
+	_type: 'point',
+
+	inRange: function(mouseX, mouseY) {
+		var vm = this._view;
+		return vm ? ((Math.pow(mouseX - vm.x, 2) + Math.pow(mouseY - vm.y, 2)) < Math.pow(vm.hitRadius + vm.radius, 2)) : false;
+	},
+
+	inLabelRange: xRange,
+	inXRange: xRange,
+	inYRange: yRange,
+
+	getCenterPoint: function() {
+		var vm = this._view;
+		return {
+			x: vm.x,
+			y: vm.y
+		};
+	},
+
+	getArea: function() {
+		return Math.PI * Math.pow(this._view.radius, 2);
+	},
+
+	tooltipPosition: function() {
+		var vm = this._view;
+		return {
+			x: vm.x,
+			y: vm.y,
+			padding: vm.radius + vm.borderWidth
+		};
+	},
+
+	draw: function(chartArea) {
+		var vm = this._view;
+		var ctx = this._chart.ctx;
+		var pointStyle = vm.pointStyle;
+		var rotation = vm.rotation;
+		var radius = vm.radius;
+		var x = vm.x;
+		var y = vm.y;
+		var globalDefaults = defaults.global;
+		var defaultColor = globalDefaults.defaultColor; // eslint-disable-line no-shadow
+
+		if (vm.skip) {
+			return;
+		}
+
+		// Clipping for Points.
+		if (chartArea === undefined || helpers.canvas._isPointInArea(vm, chartArea)) {
+			ctx.strokeStyle = vm.borderColor || defaultColor;
+			ctx.lineWidth = valueOrDefault(vm.borderWidth, globalDefaults.elements.point.borderWidth);
+			ctx.fillStyle = vm.backgroundColor || defaultColor;
+			helpers.canvas.drawPoint(ctx, pointStyle, radius, x, y, rotation);
+		}
+	}
+});

assets/chart/src/elements/element.rectangle.js

@@ -0,0 +1,213 @@
+'use strict';
+
+var defaults = require('../core/core.defaults');
+var Element = require('../core/core.element');
+var helpers = require('../helpers/index');
+
+var defaultColor = defaults.global.defaultColor;
+
+defaults._set('global', {
+	elements: {
+		rectangle: {
+			backgroundColor: defaultColor,
+			borderColor: defaultColor,
+			borderSkipped: 'bottom',
+			borderWidth: 0
+		}
+	}
+});
+
+function isVertical(vm) {
+	return vm && vm.width !== undefined;
+}
+
+/**
+ * Helper function to get the bounds of the bar regardless of the orientation
+ * @param bar {Chart.Element.Rectangle} the bar
+ * @return {Bounds} bounds of the bar
+ * @private
+ */
+function getBarBounds(vm) {
+	var x1, x2, y1, y2, half;
+
+	if (isVertical(vm)) {
+		half = vm.width / 2;
+		x1 = vm.x - half;
+		x2 = vm.x + half;
+		y1 = Math.min(vm.y, vm.base);
+		y2 = Math.max(vm.y, vm.base);
+	} else {
+		half = vm.height / 2;
+		x1 = Math.min(vm.x, vm.base);
+		x2 = Math.max(vm.x, vm.base);
+		y1 = vm.y - half;
+		y2 = vm.y + half;
+	}
+
+	return {
+		left: x1,
+		top: y1,
+		right: x2,
+		bottom: y2
+	};
+}
+
+function swap(orig, v1, v2) {
+	return orig === v1 ? v2 : orig === v2 ? v1 : orig;
+}
+
+function parseBorderSkipped(vm) {
+	var edge = vm.borderSkipped;
+	var res = {};
+
+	if (!edge) {
+		return res;
+	}
+
+	if (vm.horizontal) {
+		if (vm.base > vm.x) {
+			edge = swap(edge, 'left', 'right');
+		}
+	} else if (vm.base < vm.y) {
+		edge = swap(edge, 'bottom', 'top');
+	}
+
+	res[edge] = true;
+	return res;
+}
+
+function parseBorderWidth(vm, maxW, maxH) {
+	var value = vm.borderWidth;
+	var skip = parseBorderSkipped(vm);
+	var t, r, b, l;
+
+	if (helpers.isObject(value)) {
+		t = +value.top || 0;
+		r = +value.right || 0;
+		b = +value.bottom || 0;
+		l = +value.left || 0;
+	} else {
+		t = r = b = l = +value || 0;
+	}
+
+	return {
+		t: skip.top || (t < 0) ? 0 : t > maxH ? maxH : t,
+		r: skip.right || (r < 0) ? 0 : r > maxW ? maxW : r,
+		b: skip.bottom || (b < 0) ? 0 : b > maxH ? maxH : b,
+		l: skip.left || (l < 0) ? 0 : l > maxW ? maxW : l
+	};
+}
+
+function boundingRects(vm) {
+	var bounds = getBarBounds(vm);
+	var width = bounds.right - bounds.left;
+	var height = bounds.bottom - bounds.top;
+	var border = parseBorderWidth(vm, width / 2, height / 2);
+
+	return {
+		outer: {
+			x: bounds.left,
+			y: bounds.top,
+			w: width,
+			h: height
+		},
+		inner: {
+			x: bounds.left + border.l,
+			y: bounds.top + border.t,
+			w: width - border.l - border.r,
+			h: height - border.t - border.b
+		}
+	};
+}
+
+function inRange(vm, x, y) {
+	var skipX = x === null;
+	var skipY = y === null;
+	var bounds = !vm || (skipX && skipY) ? false : getBarBounds(vm);
+
+	return bounds
+		&& (skipX || x >= bounds.left && x <= bounds.right)
+		&& (skipY || y >= bounds.top && y <= bounds.bottom);
+}
+
+module.exports = Element.extend({
+	_type: 'rectangle',
+
+	draw: function() {
+		var ctx = this._chart.ctx;
+		var vm = this._view;
+		var rects = boundingRects(vm);
+		var outer = rects.outer;
+		var inner = rects.inner;
+
+		ctx.fillStyle = vm.backgroundColor;
+		ctx.fillRect(outer.x, outer.y, outer.w, outer.h);
+
+		if (outer.w === inner.w && outer.h === inner.h) {
+			return;
+		}
+
+		ctx.save();
+		ctx.beginPath();
+		ctx.rect(outer.x, outer.y, outer.w, outer.h);
+		ctx.clip();
+		ctx.fillStyle = vm.borderColor;
+		ctx.rect(inner.x, inner.y, inner.w, inner.h);
+		ctx.fill('evenodd');
+		ctx.restore();
+	},
+
+	height: function() {
+		var vm = this._view;
+		return vm.base - vm.y;
+	},
+
+	inRange: function(mouseX, mouseY) {
+		return inRange(this._view, mouseX, mouseY);
+	},
+
+	inLabelRange: function(mouseX, mouseY) {
+		var vm = this._view;
+		return isVertical(vm)
+			? inRange(vm, mouseX, null)
+			: inRange(vm, null, mouseY);
+	},
+
+	inXRange: function(mouseX) {
+		return inRange(this._view, mouseX, null);
+	},
+
+	inYRange: function(mouseY) {
+		return inRange(this._view, null, mouseY);
+	},
+
+	getCenterPoint: function() {
+		var vm = this._view;
+		var x, y;
+		if (isVertical(vm)) {
+			x = vm.x;
+			y = (vm.y + vm.base) / 2;
+		} else {
+			x = (vm.x + vm.base) / 2;
+			y = vm.y;
+		}
+
+		return {x: x, y: y};
+	},
+
+	getArea: function() {
+		var vm = this._view;
+
+		return isVertical(vm)
+			? vm.width * Math.abs(vm.y - vm.base)
+			: vm.height * Math.abs(vm.x - vm.base);
+	},
+
+	tooltipPosition: function() {
+		var vm = this._view;
+		return {
+			x: vm.x,
+			y: vm.y
+		};
+	}
+});

assets/chart/src/elements/index.js

@@ -0,0 +1,7 @@
+'use strict';
+
+module.exports = {};
+module.exports.Arc = require('./element.arc');
+module.exports.Line = require('./element.line');
+module.exports.Point = require('./element.point');
+module.exports.Rectangle = require('./element.rectangle');

assets/chart/src/helpers/helpers.canvas.js

@@ -0,0 +1,258 @@
+'use strict';
+
+var helpers = require('./helpers.core');
+
+var PI = Math.PI;
+var RAD_PER_DEG = PI / 180;
+var DOUBLE_PI = PI * 2;
+var HALF_PI = PI / 2;
+var QUARTER_PI = PI / 4;
+var TWO_THIRDS_PI = PI * 2 / 3;
+
+/**
+ * @namespace Chart.helpers.canvas
+ */
+var exports = {
+	/**
+	 * Clears the entire canvas associated to the given `chart`.
+	 * @param {Chart} chart - The chart for which to clear the canvas.
+	 */
+	clear: function(chart) {
+		chart.ctx.clearRect(0, 0, chart.width, chart.height);
+	},
+
+	/**
+	 * Creates a "path" for a rectangle with rounded corners at position (x, y) with a
+	 * given size (width, height) and the same `radius` for all corners.
+	 * @param {CanvasRenderingContext2D} ctx - The canvas 2D Context.
+	 * @param {number} x - The x axis of the coordinate for the rectangle starting point.
+	 * @param {number} y - The y axis of the coordinate for the rectangle starting point.
+	 * @param {number} width - The rectangle's width.
+	 * @param {number} height - The rectangle's height.
+	 * @param {number} radius - The rounded amount (in pixels) for the four corners.
+	 * @todo handle `radius` as top-left, top-right, bottom-right, bottom-left array/object?
+	 */
+	roundedRect: function(ctx, x, y, width, height, radius) {
+		if (radius) {
+			var r = Math.min(radius, height / 2, width / 2);
+			var left = x + r;
+			var top = y + r;
+			var right = x + width - r;
+			var bottom = y + height - r;
+
+			ctx.moveTo(x, top);
+			if (left < right && top < bottom) {
+				ctx.arc(left, top, r, -PI, -HALF_PI);
+				ctx.arc(right, top, r, -HALF_PI, 0);
+				ctx.arc(right, bottom, r, 0, HALF_PI);
+				ctx.arc(left, bottom, r, HALF_PI, PI);
+			} else if (left < right) {
+				ctx.moveTo(left, y);
+				ctx.arc(right, top, r, -HALF_PI, HALF_PI);
+				ctx.arc(left, top, r, HALF_PI, PI + HALF_PI);
+			} else if (top < bottom) {
+				ctx.arc(left, top, r, -PI, 0);
+				ctx.arc(left, bottom, r, 0, PI);
+			} else {
+				ctx.arc(left, top, r, -PI, PI);
+			}
+			ctx.closePath();
+			ctx.moveTo(x, y);
+		} else {
+			ctx.rect(x, y, width, height);
+		}
+	},
+
+	drawPoint: function(ctx, style, radius, x, y, rotation) {
+		var type, xOffset, yOffset, size, cornerRadius;
+		var rad = (rotation || 0) * RAD_PER_DEG;
+
+		if (style && typeof style === 'object') {
+			type = style.toString();
+			if (type === '[object HTMLImageElement]' || type === '[object HTMLCanvasElement]') {
+				ctx.save();
+				ctx.translate(x, y);
+				ctx.rotate(rad);
+				ctx.drawImage(style, -style.width / 2, -style.height / 2, style.width, style.height);
+				ctx.restore();
+				return;
+			}
+		}
+
+		if (isNaN(radius) || radius <= 0) {
+			return;
+		}
+
+		ctx.beginPath();
+
+		switch (style) {
+		// Default includes circle
+		default:
+			ctx.arc(x, y, radius, 0, DOUBLE_PI);
+			ctx.closePath();
+			break;
+		case 'triangle':
+			ctx.moveTo(x + Math.sin(rad) * radius, y - Math.cos(rad) * radius);
+			rad += TWO_THIRDS_PI;
+			ctx.lineTo(x + Math.sin(rad) * radius, y - Math.cos(rad) * radius);
+			rad += TWO_THIRDS_PI;
+			ctx.lineTo(x + Math.sin(rad) * radius, y - Math.cos(rad) * radius);
+			ctx.closePath();
+			break;
+		case 'rectRounded':
+			// NOTE: the rounded rect implementation changed to use `arc` instead of
+			// `quadraticCurveTo` since it generates better results when rect is
+			// almost a circle. 0.516 (instead of 0.5) produces results with visually
+			// closer proportion to the previous impl and it is inscribed in the
+			// circle with `radius`. For more details, see the following PRs:
+			// https://github.com/chartjs/Chart.js/issues/5597
+			// https://github.com/chartjs/Chart.js/issues/5858
+			cornerRadius = radius * 0.516;
+			size = radius - cornerRadius;
+			xOffset = Math.cos(rad + QUARTER_PI) * size;
+			yOffset = Math.sin(rad + QUARTER_PI) * size;
+			ctx.arc(x - xOffset, y - yOffset, cornerRadius, rad - PI, rad - HALF_PI);
+			ctx.arc(x + yOffset, y - xOffset, cornerRadius, rad - HALF_PI, rad);
+			ctx.arc(x + xOffset, y + yOffset, cornerRadius, rad, rad + HALF_PI);
+			ctx.arc(x - yOffset, y + xOffset, cornerRadius, rad + HALF_PI, rad + PI);
+			ctx.closePath();
+			break;
+		case 'rect':
+			if (!rotation) {
+				size = Math.SQRT1_2 * radius;
+				ctx.rect(x - size, y - size, 2 * size, 2 * size);
+				break;
+			}
+			rad += QUARTER_PI;
+			/* falls through */
+		case 'rectRot':
+			xOffset = Math.cos(rad) * radius;
+			yOffset = Math.sin(rad) * radius;
+			ctx.moveTo(x - xOffset, y - yOffset);
+			ctx.lineTo(x + yOffset, y - xOffset);
+			ctx.lineTo(x + xOffset, y + yOffset);
+			ctx.lineTo(x - yOffset, y + xOffset);
+			ctx.closePath();
+			break;
+		case 'crossRot':
+			rad += QUARTER_PI;
+			/* falls through */
+		case 'cross':
+			xOffset = Math.cos(rad) * radius;
+			yOffset = Math.sin(rad) * radius;
+			ctx.moveTo(x - xOffset, y - yOffset);
+			ctx.lineTo(x + xOffset, y + yOffset);
+			ctx.moveTo(x + yOffset, y - xOffset);
+			ctx.lineTo(x - yOffset, y + xOffset);
+			break;
+		case 'star':
+			xOffset = Math.cos(rad) * radius;
+			yOffset = Math.sin(rad) * radius;
+			ctx.moveTo(x - xOffset, y - yOffset);
+			ctx.lineTo(x + xOffset, y + yOffset);
+			ctx.moveTo(x + yOffset, y - xOffset);
+			ctx.lineTo(x - yOffset, y + xOffset);
+			rad += QUARTER_PI;
+			xOffset = Math.cos(rad) * radius;
+			yOffset = Math.sin(rad) * radius;
+			ctx.moveTo(x - xOffset, y - yOffset);
+			ctx.lineTo(x + xOffset, y + yOffset);
+			ctx.moveTo(x + yOffset, y - xOffset);
+			ctx.lineTo(x - yOffset, y + xOffset);
+			break;
+		case 'line':
+			xOffset = Math.cos(rad) * radius;
+			yOffset = Math.sin(rad) * radius;
+			ctx.moveTo(x - xOffset, y - yOffset);
+			ctx.lineTo(x + xOffset, y + yOffset);
+			break;
+		case 'dash':
+			ctx.moveTo(x, y);
+			ctx.lineTo(x + Math.cos(rad) * radius, y + Math.sin(rad) * radius);
+			break;
+		}
+
+		ctx.fill();
+		ctx.stroke();
+	},
+
+	/**
+	 * Returns true if the point is inside the rectangle
+	 * @param {object} point - The point to test
+	 * @param {object} area - The rectangle
+	 * @returns {boolean}
+	 * @private
+	 */
+	_isPointInArea: function(point, area) {
+		var epsilon = 1e-6; // 1e-6 is margin in pixels for accumulated error.
+
+		return point.x > area.left - epsilon && point.x < area.right + epsilon &&
+			point.y > area.top - epsilon && point.y < area.bottom + epsilon;
+	},
+
+	clipArea: function(ctx, area) {
+		ctx.save();
+		ctx.beginPath();
+		ctx.rect(area.left, area.top, area.right - area.left, area.bottom - area.top);
+		ctx.clip();
+	},
+
+	unclipArea: function(ctx) {
+		ctx.restore();
+	},
+
+	lineTo: function(ctx, previous, target, flip) {
+		var stepped = target.steppedLine;
+		if (stepped) {
+			if (stepped === 'middle') {
+				var midpoint = (previous.x + target.x) / 2.0;
+				ctx.lineTo(midpoint, flip ? target.y : previous.y);
+				ctx.lineTo(midpoint, flip ? previous.y : target.y);
+			} else if ((stepped === 'after' && !flip) || (stepped !== 'after' && flip)) {
+				ctx.lineTo(previous.x, target.y);
+			} else {
+				ctx.lineTo(target.x, previous.y);
+			}
+			ctx.lineTo(target.x, target.y);
+			return;
+		}
+
+		if (!target.tension) {
+			ctx.lineTo(target.x, target.y);
+			return;
+		}
+
+		ctx.bezierCurveTo(
+			flip ? previous.controlPointPreviousX : previous.controlPointNextX,
+			flip ? previous.controlPointPreviousY : previous.controlPointNextY,
+			flip ? target.controlPointNextX : target.controlPointPreviousX,
+			flip ? target.controlPointNextY : target.controlPointPreviousY,
+			target.x,
+			target.y);
+	}
+};
+
+module.exports = exports;
+
+// DEPRECATIONS
+
+/**
+ * Provided for backward compatibility, use Chart.helpers.canvas.clear instead.
+ * @namespace Chart.helpers.clear
+ * @deprecated since version 2.7.0
+ * @todo remove at version 3
+ * @private
+ */
+helpers.clear = exports.clear;
+
+/**
+ * Provided for backward compatibility, use Chart.helpers.canvas.roundedRect instead.
+ * @namespace Chart.helpers.drawRoundedRectangle
+ * @deprecated since version 2.7.0
+ * @todo remove at version 3
+ * @private
+ */
+helpers.drawRoundedRectangle = function(ctx) {
+	ctx.beginPath();
+	exports.roundedRect.apply(exports, arguments);
+};

assets/chart/src/helpers/helpers.core.js

@@ -0,0 +1,360 @@
+'use strict';
+
+/**
+ * @namespace Chart.helpers
+ */
+var helpers = {
+	/**
+	 * An empty function that can be used, for example, for optional callback.
+	 */
+	noop: function() {},
+
+	/**
+	 * Returns a unique id, sequentially generated from a global variable.
+	 * @returns {number}
+	 * @function
+	 */
+	uid: (function() {
+		var id = 0;
+		return function() {
+			return id++;
+		};
+	}()),
+
+	/**
+	 * Returns true if `value` is neither null nor undefined, else returns false.
+	 * @param {*} value - The value to test.
+	 * @returns {boolean}
+	 * @since 2.7.0
+	 */
+	isNullOrUndef: function(value) {
+		return value === null || typeof value === 'undefined';
+	},
+
+	/**
+	 * Returns true if `value` is an array (including typed arrays), else returns false.
+	 * @param {*} value - The value to test.
+	 * @returns {boolean}
+	 * @function
+	 */
+	isArray: function(value) {
+		if (Array.isArray && Array.isArray(value)) {
+			return true;
+		}
+		var type = Object.prototype.toString.call(value);
+		if (type.substr(0, 7) === '[object' && type.substr(-6) === 'Array]') {
+			return true;
+		}
+		return false;
+	},
+
+	/**
+	 * Returns true if `value` is an object (excluding null), else returns false.
+	 * @param {*} value - The value to test.
+	 * @returns {boolean}
+	 * @since 2.7.0
+	 */
+	isObject: function(value) {
+		return value !== null && Object.prototype.toString.call(value) === '[object Object]';
+	},
+
+	/**
+	 * Returns true if `value` is a finite number, else returns false
+	 * @param {*} value  - The value to test.
+	 * @returns {boolean}
+	 */
+	isFinite: function(value) {
+		return (typeof value === 'number' || value instanceof Number) && isFinite(value);
+	},
+
+	/**
+	 * Returns `value` if defined, else returns `defaultValue`.
+	 * @param {*} value - The value to return if defined.
+	 * @param {*} defaultValue - The value to return if `value` is undefined.
+	 * @returns {*}
+	 */
+	valueOrDefault: function(value, defaultValue) {
+		return typeof value === 'undefined' ? defaultValue : value;
+	},
+
+	/**
+	 * Returns value at the given `index` in array if defined, else returns `defaultValue`.
+	 * @param {Array} value - The array to lookup for value at `index`.
+	 * @param {number} index - The index in `value` to lookup for value.
+	 * @param {*} defaultValue - The value to return if `value[index]` is undefined.
+	 * @returns {*}
+	 */
+	valueAtIndexOrDefault: function(value, index, defaultValue) {
+		return helpers.valueOrDefault(helpers.isArray(value) ? value[index] : value, defaultValue);
+	},
+
+	/**
+	 * Calls `fn` with the given `args` in the scope defined by `thisArg` and returns the
+	 * value returned by `fn`. If `fn` is not a function, this method returns undefined.
+	 * @param {function} fn - The function to call.
+	 * @param {Array|undefined|null} args - The arguments with which `fn` should be called.
+	 * @param {object} [thisArg] - The value of `this` provided for the call to `fn`.
+	 * @returns {*}
+	 */
+	callback: function(fn, args, thisArg) {
+		if (fn && typeof fn.call === 'function') {
+			return fn.apply(thisArg, args);
+		}
+	},
+
+	/**
+	 * Note(SB) for performance sake, this method should only be used when loopable type
+	 * is unknown or in none intensive code (not called often and small loopable). Else
+	 * it's preferable to use a regular for() loop and save extra function calls.
+	 * @param {object|Array} loopable - The object or array to be iterated.
+	 * @param {function} fn - The function to call for each item.
+	 * @param {object} [thisArg] - The value of `this` provided for the call to `fn`.
+	 * @param {boolean} [reverse] - If true, iterates backward on the loopable.
+	 */
+	each: function(loopable, fn, thisArg, reverse) {
+		var i, len, keys;
+		if (helpers.isArray(loopable)) {
+			len = loopable.length;
+			if (reverse) {
+				for (i = len - 1; i >= 0; i--) {
+					fn.call(thisArg, loopable[i], i);
+				}
+			} else {
+				for (i = 0; i < len; i++) {
+					fn.call(thisArg, loopable[i], i);
+				}
+			}
+		} else if (helpers.isObject(loopable)) {
+			keys = Object.keys(loopable);
+			len = keys.length;
+			for (i = 0; i < len; i++) {
+				fn.call(thisArg, loopable[keys[i]], keys[i]);
+			}
+		}
+	},
+
+	/**
+	 * Returns true if the `a0` and `a1` arrays have the same content, else returns false.
+	 * @see https://stackoverflow.com/a/14853974
+	 * @param {Array} a0 - The array to compare
+	 * @param {Array} a1 - The array to compare
+	 * @returns {boolean}
+	 */
+	arrayEquals: function(a0, a1) {
+		var i, ilen, v0, v1;
+
+		if (!a0 || !a1 || a0.length !== a1.length) {
+			return false;
+		}
+
+		for (i = 0, ilen = a0.length; i < ilen; ++i) {
+			v0 = a0[i];
+			v1 = a1[i];
+
+			if (v0 instanceof Array && v1 instanceof Array) {
+				if (!helpers.arrayEquals(v0, v1)) {
+					return false;
+				}
+			} else if (v0 !== v1) {
+				// NOTE: two different object instances will never be equal: {x:20} != {x:20}
+				return false;
+			}
+		}
+
+		return true;
+	},
+
+	/**
+	 * Returns a deep copy of `source` without keeping references on objects and arrays.
+	 * @param {*} source - The value to clone.
+	 * @returns {*}
+	 */
+	clone: function(source) {
+		if (helpers.isArray(source)) {
+			return source.map(helpers.clone);
+		}
+
+		if (helpers.isObject(source)) {
+			var target = {};
+			var keys = Object.keys(source);
+			var klen = keys.length;
+			var k = 0;
+
+			for (; k < klen; ++k) {
+				target[keys[k]] = helpers.clone(source[keys[k]]);
+			}
+
+			return target;
+		}
+
+		return source;
+	},
+
+	/**
+	 * The default merger when Chart.helpers.merge is called without merger option.
+	 * Note(SB): also used by mergeConfig and mergeScaleConfig as fallback.
+	 * @private
+	 */
+	_merger: function(key, target, source, options) {
+		var tval = target[key];
+		var sval = source[key];
+
+		if (helpers.isObject(tval) && helpers.isObject(sval)) {
+			helpers.merge(tval, sval, options);
+		} else {
+			target[key] = helpers.clone(sval);
+		}
+	},
+
+	/**
+	 * Merges source[key] in target[key] only if target[key] is undefined.
+	 * @private
+	 */
+	_mergerIf: function(key, target, source) {
+		var tval = target[key];
+		var sval = source[key];
+
+		if (helpers.isObject(tval) && helpers.isObject(sval)) {
+			helpers.mergeIf(tval, sval);
+		} else if (!target.hasOwnProperty(key)) {
+			target[key] = helpers.clone(sval);
+		}
+	},
+
+	/**
+	 * Recursively deep copies `source` properties into `target` with the given `options`.
+	 * IMPORTANT: `target` is not cloned and will be updated with `source` properties.
+	 * @param {object} target - The target object in which all sources are merged into.
+	 * @param {object|object[]} source - Object(s) to merge into `target`.
+	 * @param {object} [options] - Merging options:
+	 * @param {function} [options.merger] - The merge method (key, target, source, options)
+	 * @returns {object} The `target` object.
+	 */
+	merge: function(target, source, options) {
+		var sources = helpers.isArray(source) ? source : [source];
+		var ilen = sources.length;
+		var merge, i, keys, klen, k;
+
+		if (!helpers.isObject(target)) {
+			return target;
+		}
+
+		options = options || {};
+		merge = options.merger || helpers._merger;
+
+		for (i = 0; i < ilen; ++i) {
+			source = sources[i];
+			if (!helpers.isObject(source)) {
+				continue;
+			}
+
+			keys = Object.keys(source);
+			for (k = 0, klen = keys.length; k < klen; ++k) {
+				merge(keys[k], target, source, options);
+			}
+		}
+
+		return target;
+	},
+
+	/**
+	 * Recursively deep copies `source` properties into `target` *only* if not defined in target.
+	 * IMPORTANT: `target` is not cloned and will be updated with `source` properties.
+	 * @param {object} target - The target object in which all sources are merged into.
+	 * @param {object|object[]} source - Object(s) to merge into `target`.
+	 * @returns {object} The `target` object.
+	 */
+	mergeIf: function(target, source) {
+		return helpers.merge(target, source, {merger: helpers._mergerIf});
+	},
+
+	/**
+	 * Applies the contents of two or more objects together into the first object.
+	 * @param {object} target - The target object in which all objects are merged into.
+	 * @param {object} arg1 - Object containing additional properties to merge in target.
+	 * @param {object} argN - Additional objects containing properties to merge in target.
+	 * @returns {object} The `target` object.
+	 */
+	extend: Object.assign || function(target) {
+		return helpers.merge(target, [].slice.call(arguments, 1), {
+			merger: function(key, dst, src) {
+				dst[key] = src[key];
+			}
+		});
+	},
+
+	/**
+	 * Basic javascript inheritance based on the model created in Backbone.js
+	 */
+	inherits: function(extensions) {
+		var me = this;
+		var ChartElement = (extensions && extensions.hasOwnProperty('constructor')) ? extensions.constructor : function() {
+			return me.apply(this, arguments);
+		};
+
+		var Surrogate = function() {
+			this.constructor = ChartElement;
+		};
+
+		Surrogate.prototype = me.prototype;
+		ChartElement.prototype = new Surrogate();
+		ChartElement.extend = helpers.inherits;
+
+		if (extensions) {
+			helpers.extend(ChartElement.prototype, extensions);
+		}
+
+		ChartElement.__super__ = me.prototype;
+		return ChartElement;
+	},
+
+	_deprecated: function(scope, value, previous, current) {
+		if (value !== undefined) {
+			console.warn(scope + ': "' + previous +
+				'" is deprecated. Please use "' + current + '" instead');
+		}
+	}
+};
+
+module.exports = helpers;
+
+// DEPRECATIONS
+
+/**
+ * Provided for backward compatibility, use Chart.helpers.callback instead.
+ * @function Chart.helpers.callCallback
+ * @deprecated since version 2.6.0
+ * @todo remove at version 3
+ * @private
+ */
+helpers.callCallback = helpers.callback;
+
+/**
+ * Provided for backward compatibility, use Array.prototype.indexOf instead.
+ * Array.prototype.indexOf compatibility: Chrome, Opera, Safari, FF1.5+, IE9+
+ * @function Chart.helpers.indexOf
+ * @deprecated since version 2.7.0
+ * @todo remove at version 3
+ * @private
+ */
+helpers.indexOf = function(array, item, fromIndex) {
+	return Array.prototype.indexOf.call(array, item, fromIndex);
+};
+
+/**
+ * Provided for backward compatibility, use Chart.helpers.valueOrDefault instead.
+ * @function Chart.helpers.getValueOrDefault
+ * @deprecated since version 2.7.0
+ * @todo remove at version 3
+ * @private
+ */
+helpers.getValueOrDefault = helpers.valueOrDefault;
+
+/**
+ * Provided for backward compatibility, use Chart.helpers.valueAtIndexOrDefault instead.
+ * @function Chart.helpers.getValueAtIndexOrDefault
+ * @deprecated since version 2.7.0
+ * @todo remove at version 3
+ * @private
+ */
+helpers.getValueAtIndexOrDefault = helpers.valueAtIndexOrDefault;

assets/chart/src/helpers/helpers.easing.js

@@ -0,0 +1,250 @@
+'use strict';
+
+var helpers = require('./helpers.core');
+
+/**
+ * Easing functions adapted from Robert Penner's easing equations.
+ * @namespace Chart.helpers.easingEffects
+ * @see http://www.robertpenner.com/easing/
+ */
+var effects = {
+	linear: function(t) {
+		return t;
+	},
+
+	easeInQuad: function(t) {
+		return t * t;
+	},
+
+	easeOutQuad: function(t) {
+		return -t * (t - 2);
+	},
+
+	easeInOutQuad: function(t) {
+		if ((t /= 0.5) < 1) {
+			return 0.5 * t * t;
+		}
+		return -0.5 * ((--t) * (t - 2) - 1);
+	},
+
+	easeInCubic: function(t) {
+		return t * t * t;
+	},
+
+	easeOutCubic: function(t) {
+		return (t = t - 1) * t * t + 1;
+	},
+
+	easeInOutCubic: function(t) {
+		if ((t /= 0.5) < 1) {
+			return 0.5 * t * t * t;
+		}
+		return 0.5 * ((t -= 2) * t * t + 2);
+	},
+
+	easeInQuart: function(t) {
+		return t * t * t * t;
+	},
+
+	easeOutQuart: function(t) {
+		return -((t = t - 1) * t * t * t - 1);
+	},
+
+	easeInOutQuart: function(t) {
+		if ((t /= 0.5) < 1) {
+			return 0.5 * t * t * t * t;
+		}
+		return -0.5 * ((t -= 2) * t * t * t - 2);
+	},
+
+	easeInQuint: function(t) {
+		return t * t * t * t * t;
+	},
+
+	easeOutQuint: function(t) {
+		return (t = t - 1) * t * t * t * t + 1;
+	},
+
+	easeInOutQuint: function(t) {
+		if ((t /= 0.5) < 1) {
+			return 0.5 * t * t * t * t * t;
+		}
+		return 0.5 * ((t -= 2) * t * t * t * t + 2);
+	},
+
+	easeInSine: function(t) {
+		return -Math.cos(t * (Math.PI / 2)) + 1;
+	},
+
+	easeOutSine: function(t) {
+		return Math.sin(t * (Math.PI / 2));
+	},
+
+	easeInOutSine: function(t) {
+		return -0.5 * (Math.cos(Math.PI * t) - 1);
+	},
+
+	easeInExpo: function(t) {
+		return (t === 0) ? 0 : Math.pow(2, 10 * (t - 1));
+	},
+
+	easeOutExpo: function(t) {
+		return (t === 1) ? 1 : -Math.pow(2, -10 * t) + 1;
+	},
+
+	easeInOutExpo: function(t) {
+		if (t === 0) {
+			return 0;
+		}
+		if (t === 1) {
+			return 1;
+		}
+		if ((t /= 0.5) < 1) {
+			return 0.5 * Math.pow(2, 10 * (t - 1));
+		}
+		return 0.5 * (-Math.pow(2, -10 * --t) + 2);
+	},
+
+	easeInCirc: function(t) {
+		if (t >= 1) {
+			return t;
+		}
+		return -(Math.sqrt(1 - t * t) - 1);
+	},
+
+	easeOutCirc: function(t) {
+		return Math.sqrt(1 - (t = t - 1) * t);
+	},
+
+	easeInOutCirc: function(t) {
+		if ((t /= 0.5) < 1) {
+			return -0.5 * (Math.sqrt(1 - t * t) - 1);
+		}
+		return 0.5 * (Math.sqrt(1 - (t -= 2) * t) + 1);
+	},
+
+	easeInElastic: function(t) {
+		var s = 1.70158;
+		var p = 0;
+		var a = 1;
+		if (t === 0) {
+			return 0;
+		}
+		if (t === 1) {
+			return 1;
+		}
+		if (!p) {
+			p = 0.3;
+		}
+		if (a < 1) {
+			a = 1;
+			s = p / 4;
+		} else {
+			s = p / (2 * Math.PI) * Math.asin(1 / a);
+		}
+		return -(a * Math.pow(2, 10 * (t -= 1)) * Math.sin((t - s) * (2 * Math.PI) / p));
+	},
+
+	easeOutElastic: function(t) {
+		var s = 1.70158;
+		var p = 0;
+		var a = 1;
+		if (t === 0) {
+			return 0;
+		}
+		if (t === 1) {
+			return 1;
+		}
+		if (!p) {
+			p = 0.3;
+		}
+		if (a < 1) {
+			a = 1;
+			s = p / 4;
+		} else {
+			s = p / (2 * Math.PI) * Math.asin(1 / a);
+		}
+		return a * Math.pow(2, -10 * t) * Math.sin((t - s) * (2 * Math.PI) / p) + 1;
+	},
+
+	easeInOutElastic: function(t) {
+		var s = 1.70158;
+		var p = 0;
+		var a = 1;
+		if (t === 0) {
+			return 0;
+		}
+		if ((t /= 0.5) === 2) {
+			return 1;
+		}
+		if (!p) {
+			p = 0.45;
+		}
+		if (a < 1) {
+			a = 1;
+			s = p / 4;
+		} else {
+			s = p / (2 * Math.PI) * Math.asin(1 / a);
+		}
+		if (t < 1) {
+			return -0.5 * (a * Math.pow(2, 10 * (t -= 1)) * Math.sin((t - s) * (2 * Math.PI) / p));
+		}
+		return a * Math.pow(2, -10 * (t -= 1)) * Math.sin((t - s) * (2 * Math.PI) / p) * 0.5 + 1;
+	},
+	easeInBack: function(t) {
+		var s = 1.70158;
+		return t * t * ((s + 1) * t - s);
+	},
+
+	easeOutBack: function(t) {
+		var s = 1.70158;
+		return (t = t - 1) * t * ((s + 1) * t + s) + 1;
+	},
+
+	easeInOutBack: function(t) {
+		var s = 1.70158;
+		if ((t /= 0.5) < 1) {
+			return 0.5 * (t * t * (((s *= (1.525)) + 1) * t - s));
+		}
+		return 0.5 * ((t -= 2) * t * (((s *= (1.525)) + 1) * t + s) + 2);
+	},
+
+	easeInBounce: function(t) {
+		return 1 - effects.easeOutBounce(1 - t);
+	},
+
+	easeOutBounce: function(t) {
+		if (t < (1 / 2.75)) {
+			return 7.5625 * t * t;
+		}
+		if (t < (2 / 2.75)) {
+			return 7.5625 * (t -= (1.5 / 2.75)) * t + 0.75;
+		}
+		if (t < (2.5 / 2.75)) {
+			return 7.5625 * (t -= (2.25 / 2.75)) * t + 0.9375;
+		}
+		return 7.5625 * (t -= (2.625 / 2.75)) * t + 0.984375;
+	},
+
+	easeInOutBounce: function(t) {
+		if (t < 0.5) {
+			return effects.easeInBounce(t * 2) * 0.5;
+		}
+		return effects.easeOutBounce(t * 2 - 1) * 0.5 + 0.5;
+	}
+};
+
+module.exports = {
+	effects: effects
+};
+
+// DEPRECATIONS
+
+/**
+ * Provided for backward compatibility, use Chart.helpers.easing.effects instead.
+ * @function Chart.helpers.easingEffects
+ * @deprecated since version 2.7.0
+ * @todo remove at version 3
+ * @private
+ */
+helpers.easingEffects = effects;

assets/chart/src/helpers/helpers.math.js

@@ -0,0 +1,57 @@
+'use strict';
+
+var helpers = require('./helpers.core');
+
+/**
+ * @alias Chart.helpers.math
+ * @namespace
+ */
+var exports = {
+	/**
+	 * Returns an array of factors sorted from 1 to sqrt(value)
+	 * @private
+	 */
+	_factorize: function(value) {
+		var result = [];
+		var sqrt = Math.sqrt(value);
+		var i;
+
+		for (i = 1; i < sqrt; i++) {
+			if (value % i === 0) {
+				result.push(i);
+				result.push(value / i);
+			}
+		}
+		if (sqrt === (sqrt | 0)) { // if value is a square number
+			result.push(sqrt);
+		}
+
+		result.sort(function(a, b) {
+			return a - b;
+		}).pop();
+		return result;
+	},
+
+	log10: Math.log10 || function(x) {
+		var exponent = Math.log(x) * Math.LOG10E; // Math.LOG10E = 1 / Math.LN10.
+		// Check for whole powers of 10,
+		// which due to floating point rounding error should be corrected.
+		var powerOf10 = Math.round(exponent);
+		var isPowerOf10 = x === Math.pow(10, powerOf10);
+
+		return isPowerOf10 ? powerOf10 : exponent;
+	}
+};
+
+module.exports = exports;
+
+// DEPRECATIONS
+
+/**
+ * Provided for backward compatibility, use Chart.helpers.math.log10 instead.
+ * @namespace Chart.helpers.log10
+ * @deprecated since version 2.9.0
+ * @todo remove at version 3
+ * @private
+ */
+helpers.log10 = exports.log10;

assets/chart/src/helpers/helpers.options.js

@@ -0,0 +1,147 @@
+'use strict';
+
+var defaults = require('../core/core.defaults');
+var helpers = require('./helpers.core');
+
+var valueOrDefault = helpers.valueOrDefault;
+
+/**
+ * Converts the given font object into a CSS font string.
+ * @param {object} font - A font object.
+ * @return {string} The CSS font string. See https://developer.mozilla.org/en-US/docs/Web/CSS/font
+ * @private
+ */
+function toFontString(font) {
+	if (!font || helpers.isNullOrUndef(font.size) || helpers.isNullOrUndef(font.family)) {
+		return null;
+	}
+
+	return (font.style ? font.style + ' ' : '')
+		+ (font.weight ? font.weight + ' ' : '')
+		+ font.size + 'px '
+		+ font.family;
+}
+
+/**
+ * @alias Chart.helpers.options
+ * @namespace
+ */
+module.exports = {
+	/**
+	 * Converts the given line height `value` in pixels for a specific font `size`.
+	 * @param {number|string} value - The lineHeight to parse (eg. 1.6, '14px', '75%', '1.6em').
+	 * @param {number} size - The font size (in pixels) used to resolve relative `value`.
+	 * @returns {number} The effective line height in pixels (size * 1.2 if value is invalid).
+	 * @see https://developer.mozilla.org/en-US/docs/Web/CSS/line-height
+	 * @since 2.7.0
+	 */
+	toLineHeight: function(value, size) {
+		var matches = ('' + value).match(/^(normal|(\d+(?:\.\d+)?)(px|em|%)?)$/);
+		if (!matches || matches[1] === 'normal') {
+			return size * 1.2;
+		}
+
+		value = +matches[2];
+
+		switch (matches[3]) {
+		case 'px':
+			return value;
+		case '%':
+			value /= 100;
+			break;
+		default:
+			break;
+		}
+
+		return size * value;
+	},
+
+	/**
+	 * Converts the given value into a padding object with pre-computed width/height.
+	 * @param {number|object} value - If a number, set the value to all TRBL component,
+	 *  else, if and object, use defined properties and sets undefined ones to 0.
+	 * @returns {object} The padding values (top, right, bottom, left, width, height)
+	 * @since 2.7.0
+	 */
+	toPadding: function(value) {
+		var t, r, b, l;
+
+		if (helpers.isObject(value)) {
+			t = +value.top || 0;
+			r = +value.right || 0;
+			b = +value.bottom || 0;
+			l = +value.left || 0;
+		} else {
+			t = r = b = l = +value || 0;
+		}
+
+		return {
+			top: t,
+			right: r,
+			bottom: b,
+			left: l,
+			height: t + b,
+			width: l + r
+		};
+	},
+
+	/**
+	 * Parses font options and returns the font object.
+	 * @param {object} options - A object that contains font options to be parsed.
+	 * @return {object} The font object.
+	 * @todo Support font.* options and renamed to toFont().
+	 * @private
+	 */
+	_parseFont: function(options) {
+		var globalDefaults = defaults.global;
+		var size = valueOrDefault(options.fontSize, globalDefaults.defaultFontSize);
+		var font = {
+			family: valueOrDefault(options.fontFamily, globalDefaults.defaultFontFamily),
+			lineHeight: helpers.options.toLineHeight(valueOrDefault(options.lineHeight, globalDefaults.defaultLineHeight), size),
+			size: size,
+			style: valueOrDefault(options.fontStyle, globalDefaults.defaultFontStyle),
+			weight: null,
+			string: ''
+		};
+
+		font.string = toFontString(font);
+		return font;
+	},
+
+	/**
+	 * Evaluates the given `inputs` sequentially and returns the first defined value.
+	 * @param {Array} inputs - An array of values, falling back to the last value.
+	 * @param {object} [context] - If defined and the current value is a function, the value
+	 * is called with `context` as first argument and the result becomes the new input.
+	 * @param {number} [index] - If defined and the current value is an array, the value
+	 * at `index` become the new input.
+	 * @param {object} [info] - object to return information about resolution in
+	 * @param {boolean} [info.cacheable] - Will be set to `false` if option is not cacheable.
+	 * @since 2.7.0
+	 */
+	resolve: function(inputs, context, index, info) {
+		var cacheable = true;
+		var i, ilen, value;
+
+		for (i = 0, ilen = inputs.length; i < ilen; ++i) {
+			value = inputs[i];
+			if (value === undefined) {
+				continue;
+			}
+			if (context !== undefined && typeof value === 'function') {
+				value = value(context);
+				cacheable = false;
+			}
+			if (index !== undefined && helpers.isArray(value)) {
+				value = value[index];
+				cacheable = false;
+			}
+			if (value !== undefined) {
+				if (info && !cacheable) {
+					info.cacheable = false;
+				}
+				return value;
+			}
+		}
+	}
+};

assets/chart/src/helpers/helpers.rtl.js

@@ -0,0 +1,75 @@
+'use strict';
+
+var getRtlAdapter = function(rectX, width) {
+	return {
+		x: function(x) {
+			return rectX + rectX + width - x;
+		},
+		setWidth: function(w) {
+			width = w;
+		},
+		textAlign: function(align) {
+			if (align === 'center') {
+				return align;
+			}
+			return align === 'right' ? 'left' : 'right';
+		},
+		xPlus: function(x, value) {
+			return x - value;
+		},
+		leftForLtr: function(x, itemWidth) {
+			return x - itemWidth;
+		},
+	};
+};
+
+var getLtrAdapter = function() {
+	return {
+		x: function(x) {
+			return x;
+		},
+		setWidth: function(w) { // eslint-disable-line no-unused-vars
+		},
+		textAlign: function(align) {
+			return align;
+		},
+		xPlus: function(x, value) {
+			return x + value;
+		},
+		leftForLtr: function(x, _itemWidth) { // eslint-disable-line no-unused-vars
+			return x;
+		},
+	};
+};
+
+var getAdapter = function(rtl, rectX, width) {
+	return rtl ? getRtlAdapter(rectX, width) : getLtrAdapter();
+};
+
+var overrideTextDirection = function(ctx, direction) {
+	var style, original;
+	if (direction === 'ltr' || direction === 'rtl') {
+		style = ctx.canvas.style;
+		original = [
+			style.getPropertyValue('direction'),
+			style.getPropertyPriority('direction'),
+		];
+
+		style.setProperty('direction', direction, 'important');
+		ctx.prevTextDirection = original;
+	}
+};
+
+var restoreTextDirection = function(ctx) {
+	var original = ctx.prevTextDirection;
+	if (original !== undefined) {
+		delete ctx.prevTextDirection;
+		ctx.canvas.style.setProperty('direction', original[0], original[1]);
+	}
+};
+
+module.exports = {
+	getRtlAdapter: getAdapter,
+	overrideTextDirection: overrideTextDirection,
+	restoreTextDirection: restoreTextDirection,
+};

assets/chart/src/helpers/index.js

@@ -0,0 +1,8 @@
+'use strict';
+
+module.exports = require('./helpers.core');
+module.exports.easing = require('./helpers.easing');
+module.exports.canvas = require('./helpers.canvas');
+module.exports.options = require('./helpers.options');
+module.exports.math = require('./helpers.math');
+module.exports.rtl = require('./helpers.rtl');

assets/chart/src/index.js

@@ -0,0 +1,150 @@
+/**
+ * @namespace Chart
+ */
+var Chart = require('./core/core.controller');
+
+Chart.helpers = require('./helpers/index');
+
+// @todo dispatch these helpers into appropriated helpers/helpers.* file and write unit tests!
+require('./core/core.helpers')(Chart);
+
+Chart._adapters = require('./core/core.adapters');
+Chart.Animation = require('./core/core.animation');
+Chart.animationService = require('./core/core.animations');
+Chart.controllers = require('./controllers/index');
+Chart.DatasetController = require('./core/core.datasetController');
+Chart.defaults = require('./core/core.defaults');
+Chart.Element = require('./core/core.element');
+Chart.elements = require('./elements/index');
+Chart.Interaction = require('./core/core.interaction');
+Chart.layouts = require('./core/core.layouts');
+Chart.platform = require('./platforms/platform');
+Chart.plugins = require('./core/core.plugins');
+Chart.Scale = require('./core/core.scale');
+Chart.scaleService = require('./core/core.scaleService');
+Chart.Ticks = require('./core/core.ticks');
+Chart.Tooltip = require('./core/core.tooltip');
+
+// Register built-in scales
+var scales = require('./scales');
+Chart.helpers.each(scales, function(scale, type) {
+	Chart.scaleService.registerScaleType(type, scale, scale._defaults);
+});
+
+// Load to register built-in adapters (as side effects)
+require('./adapters');
+
+// Loading built-in plugins
+var plugins = require('./plugins');
+for (var k in plugins) {
+	if (plugins.hasOwnProperty(k)) {
+		Chart.plugins.register(plugins[k]);
+	}
+}
+
+Chart.platform.initialize();
+
+module.exports = Chart;
+if (typeof window !== 'undefined') {
+	window.Chart = Chart;
+}
+
+// DEPRECATIONS
+
+/**
+ * Provided for backward compatibility, not available anymore
+ * @namespace Chart.Chart
+ * @deprecated since version 2.8.0
+ * @todo remove at version 3
+ * @private
+ */
+Chart.Chart = Chart;
+
+/**
+ * Provided for backward compatibility, not available anymore
+ * @namespace Chart.Legend
+ * @deprecated since version 2.1.5
+ * @todo remove at version 3
+ * @private
+ */
+Chart.Legend = plugins.legend._element;
+
+/**
+ * Provided for backward compatibility, not available anymore
+ * @namespace Chart.Title
+ * @deprecated since version 2.1.5
+ * @todo remove at version 3
+ * @private
+ */
+Chart.Title = plugins.title._element;
+
+/**
+ * Provided for backward compatibility, use Chart.plugins instead
+ * @namespace Chart.pluginService
+ * @deprecated since version 2.1.5
+ * @todo remove at version 3
+ * @private
+ */
+Chart.pluginService = Chart.plugins;
+
+/**
+ * Provided for backward compatibility, inheriting from Chart.PlugingBase has no
+ * effect, instead simply create/register plugins via plain JavaScript objects.
+ * @interface Chart.PluginBase
+ * @deprecated since version 2.5.0
+ * @todo remove at version 3
+ * @private
+ */
+Chart.PluginBase = Chart.Element.extend({});
+
+/**
+ * Provided for backward compatibility, use Chart.helpers.canvas instead.
+ * @namespace Chart.canvasHelpers
+ * @deprecated since version 2.6.0
+ * @todo remove at version 3
+ * @private
+ */
+Chart.canvasHelpers = Chart.helpers.canvas;
+
+/**
+ * Provided for backward compatibility, use Chart.layouts instead.
+ * @namespace Chart.layoutService
+ * @deprecated since version 2.7.3
+ * @todo remove at version 3
+ * @private
+ */
+Chart.layoutService = Chart.layouts;
+
+/**
+ * Provided for backward compatibility, not available anymore.
+ * @namespace Chart.LinearScaleBase
+ * @deprecated since version 2.8
+ * @todo remove at version 3
+ * @private
+ */
+Chart.LinearScaleBase = require('./scales/scale.linearbase');
+
+/**
+ * Provided for backward compatibility, instead we should create a new Chart
+ * by setting the type in the config (`new Chart(id, {type: '{chart-type}'}`).
+ * @deprecated since version 2.8.0
+ * @todo remove at version 3
+ */
+Chart.helpers.each(
+	[
+		'Bar',
+		'Bubble',
+		'Doughnut',
+		'Line',
+		'PolarArea',
+		'Radar',
+		'Scatter'
+	],
+	function(klass) {
+		Chart[klass] = function(ctx, cfg) {
+			return new Chart(ctx, Chart.helpers.merge(cfg || {}, {
+				type: klass.charAt(0).toLowerCase() + klass.slice(1)
+			}));
+		};
+	}
+);

assets/chart/src/platforms/platform.basic.js

@@ -0,0 +1,15 @@
+/**
+ * Platform fallback implementation (minimal).
+ * @see https://github.com/chartjs/Chart.js/pull/4591#issuecomment-319575939
+ */
+
+module.exports = {
+	acquireContext: function(item) {
+		if (item && item.canvas) {
+			// Support for any object associated to a canvas (including a context2d)
+			item = item.canvas;
+		}
+
+		return item && item.getContext('2d') || null;
+	}
+};

assets/chart/src/platforms/platform.dom.css

@@ -0,0 +1,47 @@
+/*
+ * DOM element rendering detection
+ * https://davidwalsh.name/detect-node-insertion
+ */
+@keyframes chartjs-render-animation {
+	from { opacity: 0.99; }
+	to { opacity: 1; }
+}
+
+.chartjs-render-monitor {
+	animation: chartjs-render-animation 0.001s;
+}
+
+/*
+ * DOM element resizing detection
+ * https://github.com/marcj/css-element-queries
+ */
+.chartjs-size-monitor,
+.chartjs-size-monitor-expand,
+.chartjs-size-monitor-shrink {
+	position: absolute;
+	direction: ltr;
+	left: 0;
+	top: 0;
+	right: 0;
+	bottom: 0;
+	overflow: hidden;
+	pointer-events: none;
+	visibility: hidden;
+	z-index: -1;
+}
+
+.chartjs-size-monitor-expand > div {
+	position: absolute;
+	width: 1000000px;
+	height: 1000000px;
+	left: 0;
+	top: 0;
+}
+
+.chartjs-size-monitor-shrink > div {
+	position: absolute;
+	width: 200%;
+	height: 200%;
+	left: 0;
+	top: 0;
+}

assets/chart/src/platforms/platform.dom.js

@@ -0,0 +1,472 @@
+/**
+ * Chart.Platform implementation for targeting a web browser
+ */
+
+'use strict';
+
+var helpers = require('../helpers/index');
+var stylesheet = require('./platform.dom.css');
+
+var EXPANDO_KEY = '$chartjs';
+var CSS_PREFIX = 'chartjs-';
+var CSS_SIZE_MONITOR = CSS_PREFIX + 'size-monitor';
+var CSS_RENDER_MONITOR = CSS_PREFIX + 'render-monitor';
+var CSS_RENDER_ANIMATION = CSS_PREFIX + 'render-animation';
+var ANIMATION_START_EVENTS = ['animationstart', 'webkitAnimationStart'];
+
+/**
+ * DOM event types -> Chart.js event types.
+ * Note: only events with different types are mapped.
+ * @see https://developer.mozilla.org/en-US/docs/Web/Events
+ */
+var EVENT_TYPES = {
+	touchstart: 'mousedown',
+	touchmove: 'mousemove',
+	touchend: 'mouseup',
+	pointerenter: 'mouseenter',
+	pointerdown: 'mousedown',
+	pointermove: 'mousemove',
+	pointerup: 'mouseup',
+	pointerleave: 'mouseout',
+	pointerout: 'mouseout'
+};
+
+/**
+ * The "used" size is the final value of a dimension property after all calculations have
+ * been performed. This method uses the computed style of `element` but returns undefined
+ * if the computed style is not expressed in pixels. That can happen in some cases where
+ * `element` has a size relative to its parent and this last one is not yet displayed,
+ * for example because of `display: none` on a parent node.
+ * @see https://developer.mozilla.org/en-US/docs/Web/CSS/used_value
+ * @returns {number} Size in pixels or undefined if unknown.
+ */
+function readUsedSize(element, property) {
+	var value = helpers.getStyle(element, property);
+	var matches = value && value.match(/^(\d+)(\.\d+)?px$/);
+	return matches ? Number(matches[1]) : undefined;
+}
+
+/**
+ * Initializes the canvas style and render size without modifying the canvas display size,
+ * since responsiveness is handled by the controller.resize() method. The config is used
+ * to determine the aspect ratio to apply in case no explicit height has been specified.
+ */
+function initCanvas(canvas, config) {
+	var style = canvas.style;
+
+	// NOTE(SB) canvas.getAttribute('width') !== canvas.width: in the first case it
+	// returns null or '' if no explicit value has been set to the canvas attribute.
+	var renderHeight = canvas.getAttribute('height');
+	var renderWidth = canvas.getAttribute('width');
+
+	// Chart.js modifies some canvas values that we want to restore on destroy
+	canvas[EXPANDO_KEY] = {
+		initial: {
+			height: renderHeight,
+			width: renderWidth,
+			style: {
+				display: style.display,
+				height: style.height,
+				width: style.width
+			}
+		}
+	};
+
+	// Force canvas to display as block to avoid extra space caused by inline
+	// elements, which would interfere with the responsive resize process.
+	// https://github.com/chartjs/Chart.js/issues/2538
+	style.display = style.display || 'block';
+
+	if (renderWidth === null || renderWidth === '') {
+		var displayWidth = readUsedSize(canvas, 'width');
+		if (displayWidth !== undefined) {
+			canvas.width = displayWidth;
+		}
+	}
+
+	if (renderHeight === null || renderHeight === '') {
+		if (canvas.style.height === '') {
+			// If no explicit render height and style height, let's apply the aspect ratio,
+			// which one can be specified by the user but also by charts as default option
+			// (i.e. options.aspectRatio). If not specified, use canvas aspect ratio of 2.
+			canvas.height = canvas.width / (config.options.aspectRatio || 2);
+		} else {
+			var displayHeight = readUsedSize(canvas, 'height');
+			if (displayWidth !== undefined) {
+				canvas.height = displayHeight;
+			}
+		}
+	}
+
+	return canvas;
+}
+
+/**
+ * Detects support for options object argument in addEventListener.
+ * https://developer.mozilla.org/en-US/docs/Web/API/EventTarget/addEventListener#Safely_detecting_option_support
+ * @private
+ */
+var supportsEventListenerOptions = (function() {
+	var supports = false;
+	try {
+		var options = Object.defineProperty({}, 'passive', {
+			// eslint-disable-next-line getter-return
+			get: function() {
+				supports = true;
+			}
+		});
+		window.addEventListener('e', null, options);
+	} catch (e) {
+		// continue regardless of error
+	}
+	return supports;
+}());
+
+// Default passive to true as expected by Chrome for 'touchstart' and 'touchend' events.
+// https://github.com/chartjs/Chart.js/issues/4287
+var eventListenerOptions = supportsEventListenerOptions ? {passive: true} : false;
+
+function addListener(node, type, listener) {
+	node.addEventListener(type, listener, eventListenerOptions);
+}
+
+function removeListener(node, type, listener) {
+	node.removeEventListener(type, listener, eventListenerOptions);
+}
+
+function createEvent(type, chart, x, y, nativeEvent) {
+	return {
+		type: type,
+		chart: chart,
+		native: nativeEvent || null,
+		x: x !== undefined ? x : null,
+		y: y !== undefined ? y : null,
+	};
+}
+
+function fromNativeEvent(event, chart) {
+	var type = EVENT_TYPES[event.type] || event.type;
+	var pos = helpers.getRelativePosition(event, chart);
+	return createEvent(type, chart, pos.x, pos.y, event);
+}
+
+function throttled(fn, thisArg) {
+	var ticking = false;
+	var args = [];
+
+	return function() {
+		args = Array.prototype.slice.call(arguments);
+		thisArg = thisArg || this;
+
+		if (!ticking) {
+			ticking = true;
+			helpers.requestAnimFrame.call(window, function() {
+				ticking = false;
+				fn.apply(thisArg, args);
+			});
+		}
+	};
+}
+
+function createDiv(cls) {
+	var el = document.createElement('div');
+	el.className = cls || '';
+	return el;
+}
+
+// Implementation based on https://github.com/marcj/css-element-queries
+function createResizer(handler) {
+	var maxSize = 1000000;
+
+	// NOTE(SB) Don't use innerHTML because it could be considered unsafe.
+	// https://github.com/chartjs/Chart.js/issues/5902
+	var resizer = createDiv(CSS_SIZE_MONITOR);
+	var expand = createDiv(CSS_SIZE_MONITOR + '-expand');
+	var shrink = createDiv(CSS_SIZE_MONITOR + '-shrink');
+
+	expand.appendChild(createDiv());
+	shrink.appendChild(createDiv());
+
+	resizer.appendChild(expand);
+	resizer.appendChild(shrink);
+	resizer._reset = function() {
+		expand.scrollLeft = maxSize;
+		expand.scrollTop = maxSize;
+		shrink.scrollLeft = maxSize;
+		shrink.scrollTop = maxSize;
+	};
+
+	var onScroll = function() {
+		resizer._reset();
+		handler();
+	};
+
+	addListener(expand, 'scroll', onScroll.bind(expand, 'expand'));
+	addListener(shrink, 'scroll', onScroll.bind(shrink, 'shrink'));
+
+	return resizer;
+}
+
+// https://davidwalsh.name/detect-node-insertion
+function watchForRender(node, handler) {
+	var expando = node[EXPANDO_KEY] || (node[EXPANDO_KEY] = {});
+	var proxy = expando.renderProxy = function(e) {
+		if (e.animationName === CSS_RENDER_ANIMATION) {
+			handler();
+		}
+	};
+
+	helpers.each(ANIMATION_START_EVENTS, function(type) {
+		addListener(node, type, proxy);
+	});
+
+	// #4737: Chrome might skip the CSS animation when the CSS_RENDER_MONITOR class
+	// is removed then added back immediately (same animation frame?). Accessing the
+	// `offsetParent` property will force a reflow and re-evaluate the CSS animation.
+	// https://gist.github.com/paulirish/5d52fb081b3570c81e3a#box-metrics
+	// https://github.com/chartjs/Chart.js/issues/4737
+	expando.reflow = !!node.offsetParent;
+
+	node.classList.add(CSS_RENDER_MONITOR);
+}
+
+function unwatchForRender(node) {
+	var expando = node[EXPANDO_KEY] || {};
+	var proxy = expando.renderProxy;
+
+	if (proxy) {
+		helpers.each(ANIMATION_START_EVENTS, function(type) {
+			removeListener(node, type, proxy);
+		});
+
+		delete expando.renderProxy;
+	}
+
+	node.classList.remove(CSS_RENDER_MONITOR);
+}
+
+function addResizeListener(node, listener, chart) {
+	var expando = node[EXPANDO_KEY] || (node[EXPANDO_KEY] = {});
+
+	// Let's keep track of this added resizer and thus avoid DOM query when removing it.
+	var resizer = expando.resizer = createResizer(throttled(function() {
+		if (expando.resizer) {
+			var container = chart.options.maintainAspectRatio && node.parentNode;
+			var w = container ? container.clientWidth : 0;
+			listener(createEvent('resize', chart));
+			if (container && container.clientWidth < w && chart.canvas) {
+				// If the container size shrank during chart resize, let's assume
+				// scrollbar appeared. So we resize again with the scrollbar visible -
+				// effectively making chart smaller and the scrollbar hidden again.
+				// Because we are inside `throttled`, and currently `ticking`, scroll
+				// events are ignored during this whole 2 resize process.
+				// If we assumed wrong and something else happened, we are resizing
+				// twice in a frame (potential performance issue)
+				listener(createEvent('resize', chart));
+			}
+		}
+	}));
+
+	// The resizer needs to be attached to the node parent, so we first need to be
+	// sure that `node` is attached to the DOM before injecting the resizer element.
+	watchForRender(node, function() {
+		if (expando.resizer) {
+			var container = node.parentNode;
+			if (container && container !== resizer.parentNode) {
+				container.insertBefore(resizer, container.firstChild);
+			}
+
+			// The container size might have changed, let's reset the resizer state.
+			resizer._reset();
+		}
+	});
+}
+
+function removeResizeListener(node) {
+	var expando = node[EXPANDO_KEY] || {};
+	var resizer = expando.resizer;
+
+	delete expando.resizer;
+	unwatchForRender(node);
+
+	if (resizer && resizer.parentNode) {
+		resizer.parentNode.removeChild(resizer);
+	}
+}
+
+/**
+ * Injects CSS styles inline if the styles are not already present.
+ * @param {HTMLDocument|ShadowRoot} rootNode - the node to contain the <style>.
+ * @param {string} css - the CSS to be injected.
+ */
+function injectCSS(rootNode, css) {
+	// https://stackoverflow.com/q/3922139
+	var expando = rootNode[EXPANDO_KEY] || (rootNode[EXPANDO_KEY] = {});
+	if (!expando.containsStyles) {
+		expando.containsStyles = true;
+		css = '/* Chart.js */\n' + css;
+		var style = document.createElement('style');
+		style.setAttribute('type', 'text/css');
+		style.appendChild(document.createTextNode(css));
+		rootNode.appendChild(style);
+	}
+}
+
+module.exports = {
+	/**
+	 * When `true`, prevents the automatic injection of the stylesheet required to
+	 * correctly detect when the chart is added to the DOM and then resized. This
+	 * switch has been added to allow external stylesheet (`dist/Chart(.min)?.js`)
+	 * to be manually imported to make this library compatible with any CSP.
+	 * See https://github.com/chartjs/Chart.js/issues/5208
+	 */
+	disableCSSInjection: false,
+
+	/**
+	 * This property holds whether this platform is enabled for the current environment.
+	 * Currently used by platform.js to select the proper implementation.
+	 * @private
+	 */
+	_enabled: typeof window !== 'undefined' && typeof document !== 'undefined',
+
+	/**
+	 * Initializes resources that depend on platform options.
+	 * @param {HTMLCanvasElement} canvas - The Canvas element.
+	 * @private
+	 */
+	_ensureLoaded: function(canvas) {
+		if (!this.disableCSSInjection) {
+			// If the canvas is in a shadow DOM, then the styles must also be inserted
+			// into the same shadow DOM.
+			// https://github.com/chartjs/Chart.js/issues/5763
+			var root = canvas.getRootNode ? canvas.getRootNode() : document;
+			var targetNode = root.host ? root : document.head;
+			injectCSS(targetNode, stylesheet);
+		}
+	},
+
+	acquireContext: function(item, config) {
+		if (typeof item === 'string') {
+			item = document.getElementById(item);
+		} else if (item.length) {
+			// Support for array based queries (such as jQuery)
+			item = item[0];
+		}
+
+		if (item && item.canvas) {
+			// Support for any object associated to a canvas (including a context2d)
+			item = item.canvas;
+		}
+
+		// To prevent canvas fingerprinting, some add-ons undefine the getContext
+		// method, for example: https://github.com/kkapsner/CanvasBlocker
+		// https://github.com/chartjs/Chart.js/issues/2807
+		var context = item && item.getContext && item.getContext('2d');
+
+		// `instanceof HTMLCanvasElement/CanvasRenderingContext2D` fails when the item is
+		// inside an iframe or when running in a protected environment. We could guess the
+		// types from their toString() value but let's keep things flexible and assume it's
+		// a sufficient condition if the item has a context2D which has item as `canvas`.
+		// https://github.com/chartjs/Chart.js/issues/3887
+		// https://github.com/chartjs/Chart.js/issues/4102
+		// https://github.com/chartjs/Chart.js/issues/4152
+		if (context && context.canvas === item) {
+			// Load platform resources on first chart creation, to make it possible to
+			// import the library before setting platform options.
+			this._ensureLoaded(item);
+			initCanvas(item, config);
+			return context;
+		}
+
+		return null;
+	},
+
+	releaseContext: function(context) {
+		var canvas = context.canvas;
+		if (!canvas[EXPANDO_KEY]) {
+			return;
+		}
+
+		var initial = canvas[EXPANDO_KEY].initial;
+		['height', 'width'].forEach(function(prop) {
+			var value = initial[prop];
+			if (helpers.isNullOrUndef(value)) {
+				canvas.removeAttribute(prop);
+			} else {
+				canvas.setAttribute(prop, value);
+			}
+		});
+
+		helpers.each(initial.style || {}, function(value, key) {
+			canvas.style[key] = value;
+		});
+
+		// The canvas render size might have been changed (and thus the state stack discarded),
+		// we can't use save() and restore() to restore the initial state. So make sure that at
+		// least the canvas context is reset to the default state by setting the canvas width.
+		// https://www.w3.org/TR/2011/WD-html5-20110525/the-canvas-element.html
+		// eslint-disable-next-line no-self-assign
+		canvas.width = canvas.width;
+
+		delete canvas[EXPANDO_KEY];
+	},
+
+	addEventListener: function(chart, type, listener) {
+		var canvas = chart.canvas;
+		if (type === 'resize') {
+			// Note: the resize event is not supported on all browsers.
+			addResizeListener(canvas, listener, chart);
+			return;
+		}
+
+		var expando = listener[EXPANDO_KEY] || (listener[EXPANDO_KEY] = {});
+		var proxies = expando.proxies || (expando.proxies = {});
+		var proxy = proxies[chart.id + '_' + type] = function(event) {
+			listener(fromNativeEvent(event, chart));
+		};
+
+		addListener(canvas, type, proxy);
+	},
+
+	removeEventListener: function(chart, type, listener) {
+		var canvas = chart.canvas;
+		if (type === 'resize') {
+			// Note: the resize event is not supported on all browsers.
+			removeResizeListener(canvas);
+			return;
+		}
+
+		var expando = listener[EXPANDO_KEY] || {};
+		var proxies = expando.proxies || {};
+		var proxy = proxies[chart.id + '_' + type];
+		if (!proxy) {
+			return;
+		}
+
+		removeListener(canvas, type, proxy);
+	}
+};
+
+// DEPRECATIONS
+
+/**
+ * Provided for backward compatibility, use EventTarget.addEventListener instead.
+ * EventTarget.addEventListener compatibility: Chrome, Opera 7, Safari, FF1.5+, IE9+
+ * @see https://developer.mozilla.org/en-US/docs/Web/API/EventTarget/addEventListener
+ * @function Chart.helpers.addEvent
+ * @deprecated since version 2.7.0
+ * @todo remove at version 3
+ * @private
+ */
+helpers.addEvent = addListener;
+
+/**
+ * Provided for backward compatibility, use EventTarget.removeEventListener instead.
+ * EventTarget.removeEventListener compatibility: Chrome, Opera 7, Safari, FF1.5+, IE9+
+ * @see https://developer.mozilla.org/en-US/docs/Web/API/EventTarget/removeEventListener
+ * @function Chart.helpers.removeEvent
+ * @deprecated since version 2.7.0
+ * @todo remove at version 3
+ * @private
+ */
+helpers.removeEvent = removeListener;

assets/chart/src/platforms/platform.js

@@ -0,0 +1,74 @@
+'use strict';
+
+var helpers = require('../helpers/index');
+var basic = require('./platform.basic');
+var dom = require('./platform.dom');
+
+// @TODO Make possible to select another platform at build time.
+var implementation = dom._enabled ? dom : basic;
+
+/**
+ * @namespace Chart.platform
+ * @see https://chartjs.gitbooks.io/proposals/content/Platform.html
+ * @since 2.4.0
+ */
+module.exports = helpers.extend({
+	/**
+	 * @since 2.7.0
+	 */
+	initialize: function() {},
+
+	/**
+	 * Called at chart construction time, returns a context2d instance implementing
+	 * the [W3C Canvas 2D Context API standard]{@link https://www.w3.org/TR/2dcontext/}.
+	 * @param {*} item - The native item from which to acquire context (platform specific)
+	 * @param {object} options - The chart options
+	 * @returns {CanvasRenderingContext2D} context2d instance
+	 */
+	acquireContext: function() {},
+
+	/**
+	 * Called at chart destruction time, releases any resources associated to the context
+	 * previously returned by the acquireContext() method.
+	 * @param {CanvasRenderingContext2D} context - The context2d instance
+	 * @returns {boolean} true if the method succeeded, else false
+	 */
+	releaseContext: function() {},
+
+	/**
+	 * Registers the specified listener on the given chart.
+	 * @param {Chart} chart - Chart from which to listen for event
+	 * @param {string} type - The ({@link IEvent}) type to listen for
+	 * @param {function} listener - Receives a notification (an object that implements
+	 * the {@link IEvent} interface) when an event of the specified type occurs.
+	 */
+	addEventListener: function() {},
+
+	/**
+	 * Removes the specified listener previously registered with addEventListener.
+	 * @param {Chart} chart - Chart from which to remove the listener
+	 * @param {string} type - The ({@link IEvent}) type to remove
+	 * @param {function} listener - The listener function to remove from the event target.
+	 */
+	removeEventListener: function() {}
+
+}, implementation);
+
+/**
+ * @interface IPlatform
+ * Allows abstracting platform dependencies away from the chart
+ * @borrows Chart.platform.acquireContext as acquireContext
+ * @borrows Chart.platform.releaseContext as releaseContext
+ * @borrows Chart.platform.addEventListener as addEventListener
+ * @borrows Chart.platform.removeEventListener as removeEventListener
+ */
+
+/**
+ * @interface IEvent
+ * @prop {string} type - The event type name, possible values are:
+ * 'contextmenu', 'mouseenter', 'mousedown', 'mousemove', 'mouseup', 'mouseout',
+ * 'click', 'dblclick', 'keydown', 'keypress', 'keyup' and 'resize'
+ * @prop {*} native - The original native event (null for emulated events, e.g. 'resize')
+ * @prop {number} x - The mouse x position, relative to the canvas (null for incompatible events)
+ * @prop {number} y - The mouse y position, relative to the canvas (null for incompatible events)
+ */

assets/chart/src/plugins/index.js

@@ -0,0 +1,6 @@
+'use strict';
+
+module.exports = {};
+module.exports.filler = require('./plugin.filler');
+module.exports.legend = require('./plugin.legend');
+module.exports.title = require('./plugin.title');

assets/chart/src/plugins/plugin.filler.js

@@ -0,0 +1,381 @@
+/**
+ * Plugin based on discussion from the following Chart.js issues:
+ * @see https://github.com/chartjs/Chart.js/issues/2380#issuecomment-279961569
+ * @see https://github.com/chartjs/Chart.js/issues/2440#issuecomment-256461897
+ */
+
+'use strict';
+
+var defaults = require('../core/core.defaults');
+var elements = require('../elements/index');
+var helpers = require('../helpers/index');
+
+defaults._set('global', {
+	plugins: {
+		filler: {
+			propagate: true
+		}
+	}
+});
+
+var mappers = {
+	dataset: function(source) {
+		var index = source.fill;
+		var chart = source.chart;
+		var meta = chart.getDatasetMeta(index);
+		var visible = meta && chart.isDatasetVisible(index);
+		var points = (visible && meta.dataset._children) || [];
+		var length = points.length || 0;
+
+		return !length ? null : function(point, i) {
+			return (i < length && points[i]._view) || null;
+		};
+	},
+
+	boundary: function(source) {
+		var boundary = source.boundary;
+		var x = boundary ? boundary.x : null;
+		var y = boundary ? boundary.y : null;
+
+		if (helpers.isArray(boundary)) {
+			return function(point, i) {
+				return boundary[i];
+			};
+		}
+
+		return function(point) {
+			return {
+				x: x === null ? point.x : x,
+				y: y === null ? point.y : y,
+			};
+		};
+	}
+};
+
+// @todo if (fill[0] === '#')
+function decodeFill(el, index, count) {
+	var model = el._model || {};
+	var fill = model.fill;
+	var target;
+
+	if (fill === undefined) {
+		fill = !!model.backgroundColor;
+	}
+
+	if (fill === false || fill === null) {
+		return false;
+	}
+
+	if (fill === true) {
+		return 'origin';
+	}
+
+	target = parseFloat(fill, 10);
+	if (isFinite(target) && Math.floor(target) === target) {
+		if (fill[0] === '-' || fill[0] === '+') {
+			target = index + target;
+		}
+
+		if (target === index || target < 0 || target >= count) {
+			return false;
+		}
+
+		return target;
+	}
+
+	switch (fill) {
+	// compatibility
+	case 'bottom':
+		return 'start';
+	case 'top':
+		return 'end';
+	case 'zero':
+		return 'origin';
+	// supported boundaries
+	case 'origin':
+	case 'start':
+	case 'end':
+		return fill;
+	// invalid fill values
+	default:
+		return false;
+	}
+}
+
+function computeLinearBoundary(source) {
+	var model = source.el._model || {};
+	var scale = source.el._scale || {};
+	var fill = source.fill;
+	var target = null;
+	var horizontal;
+
+	if (isFinite(fill)) {
+		return null;
+	}
+
+	// Backward compatibility: until v3, we still need to support boundary values set on
+	// the model (scaleTop, scaleBottom and scaleZero) because some external plugins and
+	// controllers might still use it (e.g. the Smith chart).
+
+	if (fill === 'start') {
+		target = model.scaleBottom === undefined ? scale.bottom : model.scaleBottom;
+	} else if (fill === 'end') {
+		target = model.scaleTop === undefined ? scale.top : model.scaleTop;
+	} else if (model.scaleZero !== undefined) {
+		target = model.scaleZero;
+	} else if (scale.getBasePixel) {
+		target = scale.getBasePixel();
+	}
+
+	if (target !== undefined && target !== null) {
+		if (target.x !== undefined && target.y !== undefined) {
+			return target;
+		}
+
+		if (helpers.isFinite(target)) {
+			horizontal = scale.isHorizontal();
+			return {
+				x: horizontal ? target : null,
+				y: horizontal ? null : target
+			};
+		}
+	}
+
+	return null;
+}
+
+function computeCircularBoundary(source) {
+	var scale = source.el._scale;
+	var options = scale.options;
+	var length = scale.chart.data.labels.length;
+	var fill = source.fill;
+	var target = [];
+	var start, end, center, i, point;
+
+	if (!length) {
+		return null;
+	}
+
+	start = options.ticks.reverse ? scale.max : scale.min;
+	end = options.ticks.reverse ? scale.min : scale.max;
+	center = scale.getPointPositionForValue(0, start);
+	for (i = 0; i < length; ++i) {
+		point = fill === 'start' || fill === 'end'
+			? scale.getPointPositionForValue(i, fill === 'start' ? start : end)
+			: scale.getBasePosition(i);
+		if (options.gridLines.circular) {
+			point.cx = center.x;
+			point.cy = center.y;
+			point.angle = scale.getIndexAngle(i) - Math.PI / 2;
+		}
+		target.push(point);
+	}
+	return target;
+}
+
+function computeBoundary(source) {
+	var scale = source.el._scale || {};
+
+	if (scale.getPointPositionForValue) {
+		return computeCircularBoundary(source);
+	}
+	return computeLinearBoundary(source);
+}
+
+function resolveTarget(sources, index, propagate) {
+	var source = sources[index];
+	var fill = source.fill;
+	var visited = [index];
+	var target;
+
+	if (!propagate) {
+		return fill;
+	}
+
+	while (fill !== false && visited.indexOf(fill) === -1) {
+		if (!isFinite(fill)) {
+			return fill;
+		}
+
+		target = sources[fill];
+		if (!target) {
+			return false;
+		}
+
+		if (target.visible) {
+			return fill;
+		}
+
+		visited.push(fill);
+		fill = target.fill;
+	}
+
+	return false;
+}
+
+function createMapper(source) {
+	var fill = source.fill;
+	var type = 'dataset';
+
+	if (fill === false) {
+		return null;
+	}
+
+	if (!isFinite(fill)) {
+		type = 'boundary';
+	}
+
+	return mappers[type](source);
+}
+
+function isDrawable(point) {
+	return point && !point.skip;
+}
+
+function drawArea(ctx, curve0, curve1, len0, len1) {
+	var i, cx, cy, r;
+
+	if (!len0 || !len1) {
+		return;
+	}
+
+	// building first area curve (normal)
+	ctx.moveTo(curve0[0].x, curve0[0].y);
+	for (i = 1; i < len0; ++i) {
+		helpers.canvas.lineTo(ctx, curve0[i - 1], curve0[i]);
+	}
+
+	if (curve1[0].angle !== undefined) {
+		cx = curve1[0].cx;
+		cy = curve1[0].cy;
+		r = Math.sqrt(Math.pow(curve1[0].x - cx, 2) + Math.pow(curve1[0].y - cy, 2));
+		for (i = len1 - 1; i > 0; --i) {
+			ctx.arc(cx, cy, r, curve1[i].angle, curve1[i - 1].angle, true);
+		}
+		return;
+	}
+
+	// joining the two area curves
+	ctx.lineTo(curve1[len1 - 1].x, curve1[len1 - 1].y);
+
+	// building opposite area curve (reverse)
+	for (i = len1 - 1; i > 0; --i) {
+		helpers.canvas.lineTo(ctx, curve1[i], curve1[i - 1], true);
+	}
+}
+
+function doFill(ctx, points, mapper, view, color, loop) {
+	var count = points.length;
+	var span = view.spanGaps;
+	var curve0 = [];
+	var curve1 = [];
+	var len0 = 0;
+	var len1 = 0;
+	var i, ilen, index, p0, p1, d0, d1, loopOffset;
+
+	ctx.beginPath();
+
+	for (i = 0, ilen = count; i < ilen; ++i) {
+		index = i % count;
+		p0 = points[index]._view;
+		p1 = mapper(p0, index, view);
+		d0 = isDrawable(p0);
+		d1 = isDrawable(p1);
+
+		if (loop && loopOffset === undefined && d0) {
+			loopOffset = i + 1;
+			ilen = count + loopOffset;
+		}
+
+		if (d0 && d1) {
+			len0 = curve0.push(p0);
+			len1 = curve1.push(p1);
+		} else if (len0 && len1) {
+			if (!span) {
+				drawArea(ctx, curve0, curve1, len0, len1);
+				len0 = len1 = 0;
+				curve0 = [];
+				curve1 = [];
+			} else {
+				if (d0) {
+					curve0.push(p0);
+				}
+				if (d1) {
+					curve1.push(p1);
+				}
+			}
+		}
+	}
+
+	drawArea(ctx, curve0, curve1, len0, len1);
+
+	ctx.closePath();
+	ctx.fillStyle = color;
+	ctx.fill();
+}
+
+module.exports = {
+	id: 'filler',
+
+	afterDatasetsUpdate: function(chart, options) {
+		var count = (chart.data.datasets || []).length;
+		var propagate = options.propagate;
+		var sources = [];
+		var meta, i, el, source;
+
+		for (i = 0; i < count; ++i) {
+			meta = chart.getDatasetMeta(i);
+			el = meta.dataset;
+			source = null;
+
+			if (el && el._model && el instanceof elements.Line) {
+				source = {
+					visible: chart.isDatasetVisible(i),
+					fill: decodeFill(el, i, count),
+					chart: chart,
+					el: el
+				};
+			}
+
+			meta.$filler = source;
+			sources.push(source);
+		}
+
+		for (i = 0; i < count; ++i) {
+			source = sources[i];
+			if (!source) {
+				continue;
+			}
+
+			source.fill = resolveTarget(sources, i, propagate);
+			source.boundary = computeBoundary(source);
+			source.mapper = createMapper(source);
+		}
+	},
+
+	beforeDatasetsDraw: function(chart) {
+		var metasets = chart._getSortedVisibleDatasetMetas();
+		var ctx = chart.ctx;
+		var meta, i, el, view, points, mapper, color;
+
+		for (i = metasets.length - 1; i >= 0; --i) {
+			meta = metasets[i].$filler;
+
+			if (!meta || !meta.visible) {
+				continue;
+			}
+
+			el = meta.el;
+			view = el._view;
+			points = el._children || [];
+			mapper = meta.mapper;
+			color = view.backgroundColor || defaults.global.defaultColor;
+
+			if (mapper && color && points.length) {
+				helpers.canvas.clipArea(ctx, chart.chartArea);
+				doFill(ctx, points, mapper, view, color, el._loop);
+				helpers.canvas.unclipArea(ctx);
+			}
+		}
+	}
+};

assets/chart/src/plugins/plugin.legend.js

@@ -0,0 +1,635 @@
+'use strict';
+
+var defaults = require('../core/core.defaults');
+var Element = require('../core/core.element');
+var helpers = require('../helpers/index');
+var layouts = require('../core/core.layouts');
+
+var getRtlHelper = helpers.rtl.getRtlAdapter;
+var noop = helpers.noop;
+var valueOrDefault = helpers.valueOrDefault;
+
+defaults._set('global', {
+	legend: {
+		display: true,
+		position: 'top',
+		align: 'center',
+		fullWidth: true,
+		reverse: false,
+		weight: 1000,
+
+		// a callback that will handle
+		onClick: function(e, legendItem) {
+			var index = legendItem.datasetIndex;
+			var ci = this.chart;
+			var meta = ci.getDatasetMeta(index);
+
+			// See controller.isDatasetVisible comment
+			meta.hidden = meta.hidden === null ? !ci.data.datasets[index].hidden : null;
+
+			// We hid a dataset ... rerender the chart
+			ci.update();
+		},
+
+		onHover: null,
+		onLeave: null,
+
+		labels: {
+			boxWidth: 40,
+			padding: 10,
+			// Generates labels shown in the legend
+			// Valid properties to return:
+			// text : text to display
+			// fillStyle : fill of coloured box
+			// strokeStyle: stroke of coloured box
+			// hidden : if this legend item refers to a hidden item
+			// lineCap : cap style for line
+			// lineDash
+			// lineDashOffset :
+			// lineJoin :
+			// lineWidth :
+			generateLabels: function(chart) {
+				var datasets = chart.data.datasets;
+				var options = chart.options.legend || {};
+				var usePointStyle = options.labels && options.labels.usePointStyle;
+
+				return chart._getSortedDatasetMetas().map(function(meta) {
+					var style = meta.controller.getStyle(usePointStyle ? 0 : undefined);
+
+					return {
+						text: datasets[meta.index].label,
+						fillStyle: style.backgroundColor,
+						hidden: !chart.isDatasetVisible(meta.index),
+						lineCap: style.borderCapStyle,
+						lineDash: style.borderDash,
+						lineDashOffset: style.borderDashOffset,
+						lineJoin: style.borderJoinStyle,
+						lineWidth: style.borderWidth,
+						strokeStyle: style.borderColor,
+						pointStyle: style.pointStyle,
+						rotation: style.rotation,
+
+						// Below is extra data used for toggling the datasets
+						datasetIndex: meta.index
+					};
+				}, this);
+			}
+		}
+	},
+
+	legendCallback: function(chart) {
+		var list = document.createElement('ul');
+		var datasets = chart.data.datasets;
+		var i, ilen, listItem, listItemSpan;
+
+		list.setAttribute('class', chart.id + '-legend');
+
+		for (i = 0, ilen = datasets.length; i < ilen; i++) {
+			listItem = list.appendChild(document.createElement('li'));
+			listItemSpan = listItem.appendChild(document.createElement('span'));
+			listItemSpan.style.backgroundColor = datasets[i].backgroundColor;
+			if (datasets[i].label) {
+				listItem.appendChild(document.createTextNode(datasets[i].label));
+			}
+		}
+
+		return list.outerHTML;
+	}
+});
+
+/**
+ * Helper function to get the box width based on the usePointStyle option
+ * @param {object} labelopts - the label options on the legend
+ * @param {number} fontSize - the label font size
+ * @return {number} width of the color box area
+ */
+function getBoxWidth(labelOpts, fontSize) {
+	return labelOpts.usePointStyle && labelOpts.boxWidth > fontSize ?
+		fontSize :
+		labelOpts.boxWidth;
+}
+
+/**
+ * IMPORTANT: this class is exposed publicly as Chart.Legend, backward compatibility required!
+ */
+var Legend = Element.extend({
+
+	initialize: function(config) {
+		var me = this;
+		helpers.extend(me, config);
+
+		// Contains hit boxes for each dataset (in dataset order)
+		me.legendHitBoxes = [];
+
+		/**
+ 		 * @private
+ 		 */
+		me._hoveredItem = null;
+
+		// Are we in doughnut mode which has a different data type
+		me.doughnutMode = false;
+	},
+
+	// These methods are ordered by lifecycle. Utilities then follow.
+	// Any function defined here is inherited by all legend types.
+	// Any function can be extended by the legend type
+
+	beforeUpdate: noop,
+	update: function(maxWidth, maxHeight, margins) {
+		var me = this;
+
+		// Update Lifecycle - Probably don't want to ever extend or overwrite this function ;)
+		me.beforeUpdate();
+
+		// Absorb the master measurements
+		me.maxWidth = maxWidth;
+		me.maxHeight = maxHeight;
+		me.margins = margins;
+
+		// Dimensions
+		me.beforeSetDimensions();
+		me.setDimensions();
+		me.afterSetDimensions();
+		// Labels
+		me.beforeBuildLabels();
+		me.buildLabels();
+		me.afterBuildLabels();
+
+		// Fit
+		me.beforeFit();
+		me.fit();
+		me.afterFit();
+		//
+		me.afterUpdate();
+
+		return me.minSize;
+	},
+	afterUpdate: noop,
+
+	//
+
+	beforeSetDimensions: noop,
+	setDimensions: function() {
+		var me = this;
+		// Set the unconstrained dimension before label rotation
+		if (me.isHorizontal()) {
+			// Reset position before calculating rotation
+			me.width = me.maxWidth;
+			me.left = 0;
+			me.right = me.width;
+		} else {
+			me.height = me.maxHeight;
+
+			// Reset position before calculating rotation
+			me.top = 0;
+			me.bottom = me.height;
+		}
+
+		// Reset padding
+		me.paddingLeft = 0;
+		me.paddingTop = 0;
+		me.paddingRight = 0;
+		me.paddingBottom = 0;
+
+		// Reset minSize
+		me.minSize = {
+			width: 0,
+			height: 0
+		};
+	},
+	afterSetDimensions: noop,
+
+	//
+
+	beforeBuildLabels: noop,
+	buildLabels: function() {
+		var me = this;
+		var labelOpts = me.options.labels || {};
+		var legendItems = helpers.callback(labelOpts.generateLabels, [me.chart], me) || [];
+
+		if (labelOpts.filter) {
+			legendItems = legendItems.filter(function(item) {
+				return labelOpts.filter(item, me.chart.data);
+			});
+		}
+
+		if (me.options.reverse) {
+			legendItems.reverse();
+		}
+
+		me.legendItems = legendItems;
+	},
+	afterBuildLabels: noop,
+
+	//
+
+	beforeFit: noop,
+	fit: function() {
+		var me = this;
+		var opts = me.options;
+		var labelOpts = opts.labels;
+		var display = opts.display;
+
+		var ctx = me.ctx;
+
+		var labelFont = helpers.options._parseFont(labelOpts);
+		var fontSize = labelFont.size;
+
+		// Reset hit boxes
+		var hitboxes = me.legendHitBoxes = [];
+
+		var minSize = me.minSize;
+		var isHorizontal = me.isHorizontal();
+
+		if (isHorizontal) {
+			minSize.width = me.maxWidth; // fill all the width
+			minSize.height = display ? 10 : 0;
+		} else {
+			minSize.width = display ? 10 : 0;
+			minSize.height = me.maxHeight; // fill all the height
+		}
+
+		// Increase sizes here
+		if (!display) {
+			me.width = minSize.width = me.height = minSize.height = 0;
+			return;
+		}
+		ctx.font = labelFont.string;
+
+		if (isHorizontal) {
+			// Labels
+
+			// Width of each line of legend boxes. Labels wrap onto multiple lines when there are too many to fit on one
+			var lineWidths = me.lineWidths = [0];
+			var totalHeight = 0;
+
+			ctx.textAlign = 'left';
+			ctx.textBaseline = 'middle';
+
+			helpers.each(me.legendItems, function(legendItem, i) {
+				var boxWidth = getBoxWidth(labelOpts, fontSize);
+				var width = boxWidth + (fontSize / 2) + ctx.measureText(legendItem.text).width;
+
+				if (i === 0 || lineWidths[lineWidths.length - 1] + width + 2 * labelOpts.padding > minSize.width) {
+					totalHeight += fontSize + labelOpts.padding;
+					lineWidths[lineWidths.length - (i > 0 ? 0 : 1)] = 0;
+				}
+
+				// Store the hitbox width and height here. Final position will be updated in `draw`
+				hitboxes[i] = {
+					left: 0,
+					top: 0,
+					width: width,
+					height: fontSize
+				};
+
+				lineWidths[lineWidths.length - 1] += width + labelOpts.padding;
+			});
+
+			minSize.height += totalHeight;
+
+		} else {
+			var vPadding = labelOpts.padding;
+			var columnWidths = me.columnWidths = [];
+			var columnHeights = me.columnHeights = [];
+			var totalWidth = labelOpts.padding;
+			var currentColWidth = 0;
+			var currentColHeight = 0;
+
+			helpers.each(me.legendItems, function(legendItem, i) {
+				var boxWidth = getBoxWidth(labelOpts, fontSize);
+				var itemWidth = boxWidth + (fontSize / 2) + ctx.measureText(legendItem.text).width;
+
+				// If too tall, go to new column
+				if (i > 0 && currentColHeight + fontSize + 2 * vPadding > minSize.height) {
+					totalWidth += currentColWidth + labelOpts.padding;
+					columnWidths.push(currentColWidth); // previous column width
+					columnHeights.push(currentColHeight);
+					currentColWidth = 0;
+					currentColHeight = 0;
+				}
+
+				// Get max width
+				currentColWidth = Math.max(currentColWidth, itemWidth);
+				currentColHeight += fontSize + vPadding;
+
+				// Store the hitbox width and height here. Final position will be updated in `draw`
+				hitboxes[i] = {
+					left: 0,
+					top: 0,
+					width: itemWidth,
+					height: fontSize
+				};
+			});
+
+			totalWidth += currentColWidth;
+			columnWidths.push(currentColWidth);
+			columnHeights.push(currentColHeight);
+			minSize.width += totalWidth;
+		}
+
+		me.width = minSize.width;
+		me.height = minSize.height;
+	},
+	afterFit: noop,
+
+	// Shared Methods
+	isHorizontal: function() {
+		return this.options.position === 'top' || this.options.position === 'bottom';
+	},
+
+	// Actually draw the legend on the canvas
+	draw: function() {
+		var me = this;
+		var opts = me.options;
+		var labelOpts = opts.labels;
+		var globalDefaults = defaults.global;
+		var defaultColor = globalDefaults.defaultColor;
+		var lineDefault = globalDefaults.elements.line;
+		var legendHeight = me.height;
+		var columnHeights = me.columnHeights;
+		var legendWidth = me.width;
+		var lineWidths = me.lineWidths;
+
+		if (!opts.display) {
+			return;
+		}
+
+		var rtlHelper = getRtlHelper(opts.rtl, me.left, me.minSize.width);
+		var ctx = me.ctx;
+		var fontColor = valueOrDefault(labelOpts.fontColor, globalDefaults.defaultFontColor);
+		var labelFont = helpers.options._parseFont(labelOpts);
+		var fontSize = labelFont.size;
+		var cursor;
+
+		// Canvas setup
+		ctx.textAlign = rtlHelper.textAlign('left');
+		ctx.textBaseline = 'middle';
+		ctx.lineWidth = 0.5;
+		ctx.strokeStyle = fontColor; // for strikethrough effect
+		ctx.fillStyle = fontColor; // render in correct colour
+		ctx.font = labelFont.string;
+
+		var boxWidth = getBoxWidth(labelOpts, fontSize);
+		var hitboxes = me.legendHitBoxes;
+
+		// current position
+		var drawLegendBox = function(x, y, legendItem) {
+			if (isNaN(boxWidth) || boxWidth <= 0) {
+				return;
+			}
+
+			// Set the ctx for the box
+			ctx.save();
+
+			var lineWidth = valueOrDefault(legendItem.lineWidth, lineDefault.borderWidth);
+			ctx.fillStyle = valueOrDefault(legendItem.fillStyle, defaultColor);
+			ctx.lineCap = valueOrDefault(legendItem.lineCap, lineDefault.borderCapStyle);
+			ctx.lineDashOffset = valueOrDefault(legendItem.lineDashOffset, lineDefault.borderDashOffset);
+			ctx.lineJoin = valueOrDefault(legendItem.lineJoin, lineDefault.borderJoinStyle);
+			ctx.lineWidth = lineWidth;
+			ctx.strokeStyle = valueOrDefault(legendItem.strokeStyle, defaultColor);
+
+			if (ctx.setLineDash) {
+				// IE 9 and 10 do not support line dash
+				ctx.setLineDash(valueOrDefault(legendItem.lineDash, lineDefault.borderDash));
+			}
+
+			if (labelOpts && labelOpts.usePointStyle) {
+				// Recalculate x and y for drawPoint() because its expecting
+				// x and y to be center of figure (instead of top left)
+				var radius = boxWidth * Math.SQRT2 / 2;
+				var centerX = rtlHelper.xPlus(x, boxWidth / 2);
+				var centerY = y + fontSize / 2;
+
+				// Draw pointStyle as legend symbol
+				helpers.canvas.drawPoint(ctx, legendItem.pointStyle, radius, centerX, centerY, legendItem.rotation);
+			} else {
+				// Draw box as legend symbol
+				ctx.fillRect(rtlHelper.leftForLtr(x, boxWidth), y, boxWidth, fontSize);
+				if (lineWidth !== 0) {
+					ctx.strokeRect(rtlHelper.leftForLtr(x, boxWidth), y, boxWidth, fontSize);
+				}
+			}
+
+			ctx.restore();
+		};
+
+		var fillText = function(x, y, legendItem, textWidth) {
+			var halfFontSize = fontSize / 2;
+			var xLeft = rtlHelper.xPlus(x, boxWidth + halfFontSize);
+			var yMiddle = y + halfFontSize;
+
+			ctx.fillText(legendItem.text, xLeft, yMiddle);
+
+			if (legendItem.hidden) {
+				// Strikethrough the text if hidden
+				ctx.beginPath();
+				ctx.lineWidth = 2;
+				ctx.moveTo(xLeft, yMiddle);
+				ctx.lineTo(rtlHelper.xPlus(xLeft, textWidth), yMiddle);
+				ctx.stroke();
+			}
+		};
+
+		var alignmentOffset = function(dimension, blockSize) {
+			switch (opts.align) {
+			case 'start':
+				return labelOpts.padding;
+			case 'end':
+				return dimension - blockSize;
+			default: // center
+				return (dimension - blockSize + labelOpts.padding) / 2;
+			}
+		};
+
+		// Horizontal
+		var isHorizontal = me.isHorizontal();
+		if (isHorizontal) {
+			cursor = {
+				x: me.left + alignmentOffset(legendWidth, lineWidths[0]),
+				y: me.top + labelOpts.padding,
+				line: 0
+			};
+		} else {
+			cursor = {
+				x: me.left + labelOpts.padding,
+				y: me.top + alignmentOffset(legendHeight, columnHeights[0]),
+				line: 0
+			};
+		}
+
+		helpers.rtl.overrideTextDirection(me.ctx, opts.textDirection);
+
+		var itemHeight = fontSize + labelOpts.padding;
+		helpers.each(me.legendItems, function(legendItem, i) {
+			var textWidth = ctx.measureText(legendItem.text).width;
+			var width = boxWidth + (fontSize / 2) + textWidth;
+			var x = cursor.x;
+			var y = cursor.y;
+
+			rtlHelper.setWidth(me.minSize.width);
+
+			// Use (me.left + me.minSize.width) and (me.top + me.minSize.height)
+			// instead of me.right and me.bottom because me.width and me.height
+			// may have been changed since me.minSize was calculated
+			if (isHorizontal) {
+				if (i > 0 && x + width + labelOpts.padding > me.left + me.minSize.width) {
+					y = cursor.y += itemHeight;
+					cursor.line++;
+					x = cursor.x = me.left + alignmentOffset(legendWidth, lineWidths[cursor.line]);
+				}
+			} else if (i > 0 && y + itemHeight > me.top + me.minSize.height) {
+				x = cursor.x = x + me.columnWidths[cursor.line] + labelOpts.padding;
+				cursor.line++;
+				y = cursor.y = me.top + alignmentOffset(legendHeight, columnHeights[cursor.line]);
+			}
+
+			var realX = rtlHelper.x(x);
+
+			drawLegendBox(realX, y, legendItem);
+
+			hitboxes[i].left = rtlHelper.leftForLtr(realX, hitboxes[i].width);
+			hitboxes[i].top = y;
+
+			// Fill the actual label
+			fillText(realX, y, legendItem, textWidth);
+
+			if (isHorizontal) {
+				cursor.x += width + labelOpts.padding;
+			} else {
+				cursor.y += itemHeight;
+			}
+		});
+
+		helpers.rtl.restoreTextDirection(me.ctx, opts.textDirection);
+	},
+
+	/**
+	 * @private
+	 */
+	_getLegendItemAt: function(x, y) {
+		var me = this;
+		var i, hitBox, lh;
+
+		if (x >= me.left && x <= me.right && y >= me.top && y <= me.bottom) {
+			// See if we are touching one of the dataset boxes
+			lh = me.legendHitBoxes;
+			for (i = 0; i < lh.length; ++i) {
+				hitBox = lh[i];
+
+				if (x >= hitBox.left && x <= hitBox.left + hitBox.width && y >= hitBox.top && y <= hitBox.top + hitBox.height) {
+					// Touching an element
+					return me.legendItems[i];
+				}
+			}
+		}
+
+		return null;
+	},
+
+	/**
+	 * Handle an event
+	 * @private
+	 * @param {IEvent} event - The event to handle
+	 */
+	handleEvent: function(e) {
+		var me = this;
+		var opts = me.options;
+		var type = e.type === 'mouseup' ? 'click' : e.type;
+		var hoveredItem;
+
+		if (type === 'mousemove') {
+			if (!opts.onHover && !opts.onLeave) {
+				return;
+			}
+		} else if (type === 'click') {
+			if (!opts.onClick) {
+				return;
+			}
+		} else {
+			return;
+		}
+
+		// Chart event already has relative position in it
+		hoveredItem = me._getLegendItemAt(e.x, e.y);
+
+		if (type === 'click') {
+			if (hoveredItem && opts.onClick) {
+				// use e.native for backwards compatibility
+				opts.onClick.call(me, e.native, hoveredItem);
+			}
+		} else {
+			if (opts.onLeave && hoveredItem !== me._hoveredItem) {
+				if (me._hoveredItem) {
+					opts.onLeave.call(me, e.native, me._hoveredItem);
+				}
+				me._hoveredItem = hoveredItem;
+			}
+
+			if (opts.onHover && hoveredItem) {
+				// use e.native for backwards compatibility
+				opts.onHover.call(me, e.native, hoveredItem);
+			}
+		}
+	}
+});
+
+function createNewLegendAndAttach(chart, legendOpts) {
+	var legend = new Legend({
+		ctx: chart.ctx,
+		options: legendOpts,
+		chart: chart
+	});
+
+	layouts.configure(chart, legend, legendOpts);
+	layouts.addBox(chart, legend);
+	chart.legend = legend;
+}
+
+module.exports = {
+	id: 'legend',
+
+	/**
+	 * Backward compatibility: since 2.1.5, the legend is registered as a plugin, making
+	 * Chart.Legend obsolete. To avoid a breaking change, we export the Legend as part of
+	 * the plugin, which one will be re-exposed in the chart.js file.
+	 * https://github.com/chartjs/Chart.js/pull/2640
+	 * @private
+	 */
+	_element: Legend,
+
+	beforeInit: function(chart) {
+		var legendOpts = chart.options.legend;
+
+		if (legendOpts) {
+			createNewLegendAndAttach(chart, legendOpts);
+		}
+	},
+
+	beforeUpdate: function(chart) {
+		var legendOpts = chart.options.legend;
+		var legend = chart.legend;
+
+		if (legendOpts) {
+			helpers.mergeIf(legendOpts, defaults.global.legend);
+
+			if (legend) {
+				layouts.configure(chart, legend, legendOpts);
+				legend.options = legendOpts;
+			} else {
+				createNewLegendAndAttach(chart, legendOpts);
+			}
+		} else if (legend) {
+			layouts.removeBox(chart, legend);
+			delete chart.legend;
+		}
+	},
+
+	afterEvent: function(chart, e) {
+		var legend = chart.legend;
+		if (legend) {
+			legend.handleEvent(e);
+		}
+	}
+};

assets/chart/src/plugins/plugin.title.js

@@ -0,0 +1,243 @@
+'use strict';
+
+var defaults = require('../core/core.defaults');
+var Element = require('../core/core.element');
+var helpers = require('../helpers/index');
+var layouts = require('../core/core.layouts');
+
+var noop = helpers.noop;
+
+defaults._set('global', {
+	title: {
+		display: false,
+		fontStyle: 'bold',
+		fullWidth: true,
+		padding: 10,
+		position: 'top',
+		text: '',
+		weight: 2000         // by default greater than legend (1000) to be above
+	}
+});
+
+/**
+ * IMPORTANT: this class is exposed publicly as Chart.Legend, backward compatibility required!
+ */
+var Title = Element.extend({
+	initialize: function(config) {
+		var me = this;
+		helpers.extend(me, config);
+
+		// Contains hit boxes for each dataset (in dataset order)
+		me.legendHitBoxes = [];
+	},
+
+	// These methods are ordered by lifecycle. Utilities then follow.
+
+	beforeUpdate: noop,
+	update: function(maxWidth, maxHeight, margins) {
+		var me = this;
+
+		// Update Lifecycle - Probably don't want to ever extend or overwrite this function ;)
+		me.beforeUpdate();
+
+		// Absorb the master measurements
+		me.maxWidth = maxWidth;
+		me.maxHeight = maxHeight;
+		me.margins = margins;
+
+		// Dimensions
+		me.beforeSetDimensions();
+		me.setDimensions();
+		me.afterSetDimensions();
+		// Labels
+		me.beforeBuildLabels();
+		me.buildLabels();
+		me.afterBuildLabels();
+
+		// Fit
+		me.beforeFit();
+		me.fit();
+		me.afterFit();
+		//
+		me.afterUpdate();
+
+		return me.minSize;
+
+	},
+	afterUpdate: noop,
+
+	//
+
+	beforeSetDimensions: noop,
+	setDimensions: function() {
+		var me = this;
+		// Set the unconstrained dimension before label rotation
+		if (me.isHorizontal()) {
+			// Reset position before calculating rotation
+			me.width = me.maxWidth;
+			me.left = 0;
+			me.right = me.width;
+		} else {
+			me.height = me.maxHeight;
+
+			// Reset position before calculating rotation
+			me.top = 0;
+			me.bottom = me.height;
+		}
+
+		// Reset padding
+		me.paddingLeft = 0;
+		me.paddingTop = 0;
+		me.paddingRight = 0;
+		me.paddingBottom = 0;
+
+		// Reset minSize
+		me.minSize = {
+			width: 0,
+			height: 0
+		};
+	},
+	afterSetDimensions: noop,
+
+	//
+
+	beforeBuildLabels: noop,
+	buildLabels: noop,
+	afterBuildLabels: noop,
+
+	//
+
+	beforeFit: noop,
+	fit: function() {
+		var me = this;
+		var opts = me.options;
+		var minSize = me.minSize = {};
+		var isHorizontal = me.isHorizontal();
+		var lineCount, textSize;
+
+		if (!opts.display) {
+			me.width = minSize.width = me.height = minSize.height = 0;
+			return;
+		}
+
+		lineCount = helpers.isArray(opts.text) ? opts.text.length : 1;
+		textSize = lineCount * helpers.options._parseFont(opts).lineHeight + opts.padding * 2;
+
+		me.width = minSize.width = isHorizontal ? me.maxWidth : textSize;
+		me.height = minSize.height = isHorizontal ? textSize : me.maxHeight;
+	},
+	afterFit: noop,
+
+	// Shared Methods
+	isHorizontal: function() {
+		var pos = this.options.position;
+		return pos === 'top' || pos === 'bottom';
+	},
+
+	// Actually draw the title block on the canvas
+	draw: function() {
+		var me = this;
+		var ctx = me.ctx;
+		var opts = me.options;
+
+		if (!opts.display) {
+			return;
+		}
+
+		var fontOpts = helpers.options._parseFont(opts);
+		var lineHeight = fontOpts.lineHeight;
+		var offset = lineHeight / 2 + opts.padding;
+		var rotation = 0;
+		var top = me.top;
+		var left = me.left;
+		var bottom = me.bottom;
+		var right = me.right;
+		var maxWidth, titleX, titleY;
+
+		ctx.fillStyle = helpers.valueOrDefault(opts.fontColor, defaults.global.defaultFontColor); // render in correct colour
+		ctx.font = fontOpts.string;
+
+		// Horizontal
+		if (me.isHorizontal()) {
+			titleX = left + ((right - left) / 2); // midpoint of the width
+			titleY = top + offset;
+			maxWidth = right - left;
+		} else {
+			titleX = opts.position === 'left' ? left + offset : right - offset;
+			titleY = top + ((bottom - top) / 2);
+			maxWidth = bottom - top;
+			rotation = Math.PI * (opts.position === 'left' ? -0.5 : 0.5);
+		}
+
+		ctx.save();
+		ctx.translate(titleX, titleY);
+		ctx.rotate(rotation);
+		ctx.textAlign = 'center';
+		ctx.textBaseline = 'middle';
+
+		var text = opts.text;
+		if (helpers.isArray(text)) {
+			var y = 0;
+			for (var i = 0; i < text.length; ++i) {
+				ctx.fillText(text[i], 0, y, maxWidth);
+				y += lineHeight;
+			}
+		} else {
+			ctx.fillText(text, 0, 0, maxWidth);
+		}
+
+		ctx.restore();
+	}
+});
+
+function createNewTitleBlockAndAttach(chart, titleOpts) {
+	var title = new Title({
+		ctx: chart.ctx,
+		options: titleOpts,
+		chart: chart
+	});
+
+	layouts.configure(chart, title, titleOpts);
+	layouts.addBox(chart, title);
+	chart.titleBlock = title;
+}
+
+module.exports = {
+	id: 'title',
+
+	/**
+	 * Backward compatibility: since 2.1.5, the title is registered as a plugin, making
+	 * Chart.Title obsolete. To avoid a breaking change, we export the Title as part of
+	 * the plugin, which one will be re-exposed in the chart.js file.
+	 * https://github.com/chartjs/Chart.js/pull/2640
+	 * @private
+	 */
+	_element: Title,
+
+	beforeInit: function(chart) {
+		var titleOpts = chart.options.title;
+
+		if (titleOpts) {
+			createNewTitleBlockAndAttach(chart, titleOpts);
+		}
+	},
+
+	beforeUpdate: function(chart) {
+		var titleOpts = chart.options.title;
+		var titleBlock = chart.titleBlock;
+
+		if (titleOpts) {
+			helpers.mergeIf(titleOpts, defaults.global.title);
+
+			if (titleBlock) {
+				layouts.configure(chart, titleBlock, titleOpts);
+				titleBlock.options = titleOpts;
+			} else {
+				createNewTitleBlockAndAttach(chart, titleOpts);
+			}
+		} else if (titleBlock) {
+			layouts.removeBox(chart, titleBlock);
+			delete chart.titleBlock;
+		}
+	}
+};

assets/chart/src/scales/index.js

@@ -0,0 +1,15 @@
+'use strict';
+
+var category = require('./scale.category');
+var linear = require('./scale.linear');
+var logarithmic = require('./scale.logarithmic');
+var radialLinear = require('./scale.radialLinear');
+var time = require('./scale.time');
+
+module.exports = {
+	category: category,
+	linear: linear,
+	logarithmic: logarithmic,
+	radialLinear: radialLinear,
+	time: time
+};

assets/chart/src/scales/scale.category.js

@@ -0,0 +1,131 @@
+'use strict';
+
+var helpers = require('../helpers/index');
+var Scale = require('../core/core.scale');
+
+var isNullOrUndef = helpers.isNullOrUndef;
+
+var defaultConfig = {
+	position: 'bottom'
+};
+
+module.exports = Scale.extend({
+	determineDataLimits: function() {
+		var me = this;
+		var labels = me._getLabels();
+		var ticksOpts = me.options.ticks;
+		var min = ticksOpts.min;
+		var max = ticksOpts.max;
+		var minIndex = 0;
+		var maxIndex = labels.length - 1;
+		var findIndex;
+
+		if (min !== undefined) {
+			// user specified min value
+			findIndex = labels.indexOf(min);
+			if (findIndex >= 0) {
+				minIndex = findIndex;
+			}
+		}
+
+		if (max !== undefined) {
+			// user specified max value
+			findIndex = labels.indexOf(max);
+			if (findIndex >= 0) {
+				maxIndex = findIndex;
+			}
+		}
+
+		me.minIndex = minIndex;
+		me.maxIndex = maxIndex;
+		me.min = labels[minIndex];
+		me.max = labels[maxIndex];
+	},
+
+	buildTicks: function() {
+		var me = this;
+		var labels = me._getLabels();
+		var minIndex = me.minIndex;
+		var maxIndex = me.maxIndex;
+
+		// If we are viewing some subset of labels, slice the original array
+		me.ticks = (minIndex === 0 && maxIndex === labels.length - 1) ? labels : labels.slice(minIndex, maxIndex + 1);
+	},
+
+	getLabelForIndex: function(index, datasetIndex) {
+		var me = this;
+		var chart = me.chart;
+
+		if (chart.getDatasetMeta(datasetIndex).controller._getValueScaleId() === me.id) {
+			return me.getRightValue(chart.data.datasets[datasetIndex].data[index]);
+		}
+
+		return me._getLabels()[index];
+	},
+
+	_configure: function() {
+		var me = this;
+		var offset = me.options.offset;
+		var ticks = me.ticks;
+
+		Scale.prototype._configure.call(me);
+
+		if (!me.isHorizontal()) {
+			// For backward compatibility, vertical category scale reverse is inverted.
+			me._reversePixels = !me._reversePixels;
+		}
+
+		if (!ticks) {
+			return;
+		}
+
+		me._startValue = me.minIndex - (offset ? 0.5 : 0);
+		me._valueRange = Math.max(ticks.length - (offset ? 0 : 1), 1);
+	},
+
+	// Used to get data value locations.  Value can either be an index or a numerical value
+	getPixelForValue: function(value, index, datasetIndex) {
+		var me = this;
+		var valueCategory, labels, idx;
+
+		if (!isNullOrUndef(index) && !isNullOrUndef(datasetIndex)) {
+			value = me.chart.data.datasets[datasetIndex].data[index];
+		}
+
+		// If value is a data object, then index is the index in the data array,
+		// not the index of the scale. We need to change that.
+		if (!isNullOrUndef(value)) {
+			valueCategory = me.isHorizontal() ? value.x : value.y;
+		}
+		if (valueCategory !== undefined || (value !== undefined && isNaN(index))) {
+			labels = me._getLabels();
+			value = helpers.valueOrDefault(valueCategory, value);
+			idx = labels.indexOf(value);
+			index = idx !== -1 ? idx : index;
+			if (isNaN(index)) {
+				index = value;
+			}
+		}
+		return me.getPixelForDecimal((index - me._startValue) / me._valueRange);
+	},
+
+	getPixelForTick: function(index) {
+		var ticks = this.ticks;
+		return index < 0 || index > ticks.length - 1
+			? null
+			: this.getPixelForValue(ticks[index], index + this.minIndex);
+	},
+
+	getValueForPixel: function(pixel) {
+		var me = this;
+		var value = Math.round(me._startValue + me.getDecimalForPixel(pixel) * me._valueRange);
+		return Math.min(Math.max(value, 0), me.ticks.length - 1);
+	},
+
+	getBasePixel: function() {
+		return this.bottom;
+	}
+});
+
+// INTERNAL: static default options, registered in src/index.js
+module.exports._defaults = defaultConfig;

assets/chart/src/scales/scale.linear.js

@@ -0,0 +1,167 @@
+'use strict';
+
+var helpers = require('../helpers/index');
+var LinearScaleBase = require('./scale.linearbase');
+var Ticks = require('../core/core.ticks');
+
+var defaultConfig = {
+	position: 'left',
+	ticks: {
+		callback: Ticks.formatters.linear
+	}
+};
+
+var DEFAULT_MIN = 0;
+var DEFAULT_MAX = 1;
+
+function getOrCreateStack(stacks, stacked, meta) {
+	var key = [
+		meta.type,
+		// we have a separate stack for stack=undefined datasets when the opts.stacked is undefined
+		stacked === undefined && meta.stack === undefined ? meta.index : '',
+		meta.stack
+	].join('.');
+
+	if (stacks[key] === undefined) {
+		stacks[key] = {
+			pos: [],
+			neg: []
+		};
+	}
+
+	return stacks[key];
+}
+
+function stackData(scale, stacks, meta, data) {
+	var opts = scale.options;
+	var stacked = opts.stacked;
+	var stack = getOrCreateStack(stacks, stacked, meta);
+	var pos = stack.pos;
+	var neg = stack.neg;
+	var ilen = data.length;
+	var i, value;
+
+	for (i = 0; i < ilen; ++i) {
+		value = scale._parseValue(data[i]);
+		if (isNaN(value.min) || isNaN(value.max) || meta.data[i].hidden) {
+			continue;
+		}
+
+		pos[i] = pos[i] || 0;
+		neg[i] = neg[i] || 0;
+
+		if (opts.relativePoints) {
+			pos[i] = 100;
+		} else if (value.min < 0 || value.max < 0) {
+			neg[i] += value.min;
+		} else {
+			pos[i] += value.max;
+		}
+	}
+}
+
+function updateMinMax(scale, meta, data) {
+	var ilen = data.length;
+	var i, value;
+
+	for (i = 0; i < ilen; ++i) {
+		value = scale._parseValue(data[i]);
+		if (isNaN(value.min) || isNaN(value.max) || meta.data[i].hidden) {
+			continue;
+		}
+
+		scale.min = Math.min(scale.min, value.min);
+		scale.max = Math.max(scale.max, value.max);
+	}
+}
+
+module.exports = LinearScaleBase.extend({
+	determineDataLimits: function() {
+		var me = this;
+		var opts = me.options;
+		var chart = me.chart;
+		var datasets = chart.data.datasets;
+		var metasets = me._getMatchingVisibleMetas();
+		var hasStacks = opts.stacked;
+		var stacks = {};
+		var ilen = metasets.length;
+		var i, meta, data, values;
+
+		me.min = Number.POSITIVE_INFINITY;
+		me.max = Number.NEGATIVE_INFINITY;
+
+		if (hasStacks === undefined) {
+			for (i = 0; !hasStacks && i < ilen; ++i) {
+				meta = metasets[i];
+				hasStacks = meta.stack !== undefined;
+			}
+		}
+
+		for (i = 0; i < ilen; ++i) {
+			meta = metasets[i];
+			data = datasets[meta.index].data;
+			if (hasStacks) {
+				stackData(me, stacks, meta, data);
+			} else {
+				updateMinMax(me, meta, data);
+			}
+		}
+
+		helpers.each(stacks, function(stackValues) {
+			values = stackValues.pos.concat(stackValues.neg);
+			me.min = Math.min(me.min, helpers.min(values));
+			me.max = Math.max(me.max, helpers.max(values));
+		});
+
+		me.min = helpers.isFinite(me.min) && !isNaN(me.min) ? me.min : DEFAULT_MIN;
+		me.max = helpers.isFinite(me.max) && !isNaN(me.max) ? me.max : DEFAULT_MAX;
+
+		// Common base implementation to handle ticks.min, ticks.max, ticks.beginAtZero
+		me.handleTickRangeOptions();
+	},
+
+	// Returns the maximum number of ticks based on the scale dimension
+	_computeTickLimit: function() {
+		var me = this;
+		var tickFont;
+
+		if (me.isHorizontal()) {
+			return Math.ceil(me.width / 40);
+		}
+		tickFont = helpers.options._parseFont(me.options.ticks);
+		return Math.ceil(me.height / tickFont.lineHeight);
+	},
+
+	// Called after the ticks are built. We need
+	handleDirectionalChanges: function() {
+		if (!this.isHorizontal()) {
+			// We are in a vertical orientation. The top value is the highest. So reverse the array
+			this.ticks.reverse();
+		}
+	},
+
+	getLabelForIndex: function(index, datasetIndex) {
+		return this._getScaleLabel(this.chart.data.datasets[datasetIndex].data[index]);
+	},
+
+	// Utils
+	getPixelForValue: function(value) {
+		var me = this;
+		return me.getPixelForDecimal((+me.getRightValue(value) - me._startValue) / me._valueRange);
+	},
+
+	getValueForPixel: function(pixel) {
+		return this._startValue + this.getDecimalForPixel(pixel) * this._valueRange;
+	},
+
+	getPixelForTick: function(index) {
+		var ticks = this.ticksAsNumbers;
+		if (index < 0 || index > ticks.length - 1) {
+			return null;
+		}
+		return this.getPixelForValue(ticks[index]);
+	}
+});
+
+// INTERNAL: static default options, registered in src/index.js
+module.exports._defaults = defaultConfig;

assets/chart/src/scales/scale.linearbase.js

@@ -0,0 +1,254 @@
+'use strict';
+
+var helpers = require('../helpers/index');
+var Scale = require('../core/core.scale');
+
+var noop = helpers.noop;
+var isNullOrUndef = helpers.isNullOrUndef;
+
+/**
+ * Generate a set of linear ticks
+ * @param generationOptions the options used to generate the ticks
+ * @param dataRange the range of the data
+ * @returns {number[]} array of tick values
+ */
+function generateTicks(generationOptions, dataRange) {
+	var ticks = [];
+	// To get a "nice" value for the tick spacing, we will use the appropriately named
+	// "nice number" algorithm. See https://stackoverflow.com/questions/8506881/nice-label-algorithm-for-charts-with-minimum-ticks
+	// for details.
+
+	var MIN_SPACING = 1e-14;
+	var stepSize = generationOptions.stepSize;
+	var unit = stepSize || 1;
+	var maxNumSpaces = generationOptions.maxTicks - 1;
+	var min = generationOptions.min;
+	var max = generationOptions.max;
+	var precision = generationOptions.precision;
+	var rmin = dataRange.min;
+	var rmax = dataRange.max;
+	var spacing = helpers.niceNum((rmax - rmin) / maxNumSpaces / unit) * unit;
+	var factor, niceMin, niceMax, numSpaces;
+
+	// Beyond MIN_SPACING floating point numbers being to lose precision
+	// such that we can't do the math necessary to generate ticks
+	if (spacing < MIN_SPACING && isNullOrUndef(min) && isNullOrUndef(max)) {
+		return [rmin, rmax];
+	}
+
+	numSpaces = Math.ceil(rmax / spacing) - Math.floor(rmin / spacing);
+	if (numSpaces > maxNumSpaces) {
+		// If the calculated num of spaces exceeds maxNumSpaces, recalculate it
+		spacing = helpers.niceNum(numSpaces * spacing / maxNumSpaces / unit) * unit;
+	}
+
+	if (stepSize || isNullOrUndef(precision)) {
+		// If a precision is not specified, calculate factor based on spacing
+		factor = Math.pow(10, helpers._decimalPlaces(spacing));
+	} else {
+		// If the user specified a precision, round to that number of decimal places
+		factor = Math.pow(10, precision);
+		spacing = Math.ceil(spacing * factor) / factor;
+	}
+
+	niceMin = Math.floor(rmin / spacing) * spacing;
+	niceMax = Math.ceil(rmax / spacing) * spacing;
+
+	// If min, max and stepSize is set and they make an evenly spaced scale use it.
+	if (stepSize) {
+		// If very close to our whole number, use it.
+		if (!isNullOrUndef(min) && helpers.almostWhole(min / spacing, spacing / 1000)) {
+			niceMin = min;
+		}
+		if (!isNullOrUndef(max) && helpers.almostWhole(max / spacing, spacing / 1000)) {
+			niceMax = max;
+		}
+	}
+
+	numSpaces = (niceMax - niceMin) / spacing;
+	// If very close to our rounded value, use it.
+	if (helpers.almostEquals(numSpaces, Math.round(numSpaces), spacing / 1000)) {
+		numSpaces = Math.round(numSpaces);
+	} else {
+		numSpaces = Math.ceil(numSpaces);
+	}
+
+	niceMin = Math.round(niceMin * factor) / factor;
+	niceMax = Math.round(niceMax * factor) / factor;
+	ticks.push(isNullOrUndef(min) ? niceMin : min);
+	for (var j = 1; j < numSpaces; ++j) {
+		ticks.push(Math.round((niceMin + j * spacing) * factor) / factor);
+	}
+	ticks.push(isNullOrUndef(max) ? niceMax : max);
+
+	return ticks;
+}
+
+module.exports = Scale.extend({
+	getRightValue: function(value) {
+		if (typeof value === 'string') {
+			return +value;
+		}
+		return Scale.prototype.getRightValue.call(this, value);
+	},
+
+	handleTickRangeOptions: function() {
+		var me = this;
+		var opts = me.options;
+		var tickOpts = opts.ticks;
+
+		// If we are forcing it to begin at 0, but 0 will already be rendered on the chart,
+		// do nothing since that would make the chart weird. If the user really wants a weird chart
+		// axis, they can manually override it
+		if (tickOpts.beginAtZero) {
+			var minSign = helpers.sign(me.min);
+			var maxSign = helpers.sign(me.max);
+
+			if (minSign < 0 && maxSign < 0) {
+				// move the top up to 0
+				me.max = 0;
+			} else if (minSign > 0 && maxSign > 0) {
+				// move the bottom down to 0
+				me.min = 0;
+			}
+		}
+
+		var setMin = tickOpts.min !== undefined || tickOpts.suggestedMin !== undefined;
+		var setMax = tickOpts.max !== undefined || tickOpts.suggestedMax !== undefined;
+
+		if (tickOpts.min !== undefined) {
+			me.min = tickOpts.min;
+		} else if (tickOpts.suggestedMin !== undefined) {
+			if (me.min === null) {
+				me.min = tickOpts.suggestedMin;
+			} else {
+				me.min = Math.min(me.min, tickOpts.suggestedMin);
+			}
+		}
+
+		if (tickOpts.max !== undefined) {
+			me.max = tickOpts.max;
+		} else if (tickOpts.suggestedMax !== undefined) {
+			if (me.max === null) {
+				me.max = tickOpts.suggestedMax;
+			} else {
+				me.max = Math.max(me.max, tickOpts.suggestedMax);
+			}
+		}
+
+		if (setMin !== setMax) {
+			// We set the min or the max but not both.
+			// So ensure that our range is good
+			// Inverted or 0 length range can happen when
+			// ticks.min is set, and no datasets are visible
+			if (me.min >= me.max) {
+				if (setMin) {
+					me.max = me.min + 1;
+				} else {
+					me.min = me.max - 1;
+				}
+			}
+		}
+
+		if (me.min === me.max) {
+			me.max++;
+
+			if (!tickOpts.beginAtZero) {
+				me.min--;
+			}
+		}
+	},
+
+	getTickLimit: function() {
+		var me = this;
+		var tickOpts = me.options.ticks;
+		var stepSize = tickOpts.stepSize;
+		var maxTicksLimit = tickOpts.maxTicksLimit;
+		var maxTicks;
+
+		if (stepSize) {
+			maxTicks = Math.ceil(me.max / stepSize) - Math.floor(me.min / stepSize) + 1;
+		} else {
+			maxTicks = me._computeTickLimit();
+			maxTicksLimit = maxTicksLimit || 11;
+		}
+
+		if (maxTicksLimit) {
+			maxTicks = Math.min(maxTicksLimit, maxTicks);
+		}
+
+		return maxTicks;
+	},
+
+	_computeTickLimit: function() {
+		return Number.POSITIVE_INFINITY;
+	},
+
+	handleDirectionalChanges: noop,
+
+	buildTicks: function() {
+		var me = this;
+		var opts = me.options;
+		var tickOpts = opts.ticks;
+
+		// Figure out what the max number of ticks we can support it is based on the size of
+		// the axis area. For now, we say that the minimum tick spacing in pixels must be 40
+		// We also limit the maximum number of ticks to 11 which gives a nice 10 squares on
+		// the graph. Make sure we always have at least 2 ticks
+		var maxTicks = me.getTickLimit();
+		maxTicks = Math.max(2, maxTicks);
+
+		var numericGeneratorOptions = {
+			maxTicks: maxTicks,
+			min: tickOpts.min,
+			max: tickOpts.max,
+			precision: tickOpts.precision,
+			stepSize: helpers.valueOrDefault(tickOpts.fixedStepSize, tickOpts.stepSize)
+		};
+		var ticks = me.ticks = generateTicks(numericGeneratorOptions, me);
+
+		me.handleDirectionalChanges();
+
+		// At this point, we need to update our max and min given the tick values since we have expanded the
+		// range of the scale
+		me.max = helpers.max(ticks);
+		me.min = helpers.min(ticks);
+
+		if (tickOpts.reverse) {
+			ticks.reverse();
+
+			me.start = me.max;
+			me.end = me.min;
+		} else {
+			me.start = me.min;
+			me.end = me.max;
+		}
+	},
+
+	convertTicksToLabels: function() {
+		var me = this;
+		me.ticksAsNumbers = me.ticks.slice();
+		me.zeroLineIndex = me.ticks.indexOf(0);
+
+		Scale.prototype.convertTicksToLabels.call(me);
+	},
+
+	_configure: function() {
+		var me = this;
+		var ticks = me.getTicks();
+		var start = me.min;
+		var end = me.max;
+		var offset;
+
+		Scale.prototype._configure.call(me);
+
+		if (me.options.offset && ticks.length) {
+			offset = (end - start) / Math.max(ticks.length - 1, 1) / 2;
+			start -= offset;
+			end += offset;
+		}
+		me._startValue = start;
+		me._endValue = end;
+		me._valueRange = end - start;
+	}
+});

assets/chart/src/scales/scale.logarithmic.js

@@ -0,0 +1,308 @@
+'use strict';
+
+var defaults = require('../core/core.defaults');
+var helpers = require('../helpers/index');
+var Scale = require('../core/core.scale');
+var Ticks = require('../core/core.ticks');
+
+var valueOrDefault = helpers.valueOrDefault;
+var log10 = helpers.math.log10;
+
+/**
+ * Generate a set of logarithmic ticks
+ * @param generationOptions the options used to generate the ticks
+ * @param dataRange the range of the data
+ * @returns {number[]} array of tick values
+ */
+function generateTicks(generationOptions, dataRange) {
+	var ticks = [];
+
+	var tickVal = valueOrDefault(generationOptions.min, Math.pow(10, Math.floor(log10(dataRange.min))));
+
+	var endExp = Math.floor(log10(dataRange.max));
+	var endSignificand = Math.ceil(dataRange.max / Math.pow(10, endExp));
+	var exp, significand;
+
+	if (tickVal === 0) {
+		exp = Math.floor(log10(dataRange.minNotZero));
+		significand = Math.floor(dataRange.minNotZero / Math.pow(10, exp));
+
+		ticks.push(tickVal);
+		tickVal = significand * Math.pow(10, exp);
+	} else {
+		exp = Math.floor(log10(tickVal));
+		significand = Math.floor(tickVal / Math.pow(10, exp));
+	}
+	var precision = exp < 0 ? Math.pow(10, Math.abs(exp)) : 1;
+
+	do {
+		ticks.push(tickVal);
+
+		++significand;
+		if (significand === 10) {
+			significand = 1;
+			++exp;
+			precision = exp >= 0 ? 1 : precision;
+		}
+
+		tickVal = Math.round(significand * Math.pow(10, exp) * precision) / precision;
+	} while (exp < endExp || (exp === endExp && significand < endSignificand));
+
+	var lastTick = valueOrDefault(generationOptions.max, tickVal);
+	ticks.push(lastTick);
+
+	return ticks;
+}
+
+var defaultConfig = {
+	position: 'left',
+
+	// label settings
+	ticks: {
+		callback: Ticks.formatters.logarithmic
+	}
+};
+
+// TODO(v3): change this to positiveOrDefault
+function nonNegativeOrDefault(value, defaultValue) {
+	return helpers.isFinite(value) && value >= 0 ? value : defaultValue;
+}
+
+module.exports = Scale.extend({
+	determineDataLimits: function() {
+		var me = this;
+		var opts = me.options;
+		var chart = me.chart;
+		var datasets = chart.data.datasets;
+		var isHorizontal = me.isHorizontal();
+		function IDMatches(meta) {
+			return isHorizontal ? meta.xAxisID === me.id : meta.yAxisID === me.id;
+		}
+		var datasetIndex, meta, value, data, i, ilen;
+
+		// Calculate Range
+		me.min = Number.POSITIVE_INFINITY;
+		me.max = Number.NEGATIVE_INFINITY;
+		me.minNotZero = Number.POSITIVE_INFINITY;
+
+		var hasStacks = opts.stacked;
+		if (hasStacks === undefined) {
+			for (datasetIndex = 0; datasetIndex < datasets.length; datasetIndex++) {
+				meta = chart.getDatasetMeta(datasetIndex);
+				if (chart.isDatasetVisible(datasetIndex) && IDMatches(meta) &&
+					meta.stack !== undefined) {
+					hasStacks = true;
+					break;
+				}
+			}
+		}
+
+		if (opts.stacked || hasStacks) {
+			var valuesPerStack = {};
+
+			for (datasetIndex = 0; datasetIndex < datasets.length; datasetIndex++) {
+				meta = chart.getDatasetMeta(datasetIndex);
+				var key = [
+					meta.type,
+					// we have a separate stack for stack=undefined datasets when the opts.stacked is undefined
+					((opts.stacked === undefined && meta.stack === undefined) ? datasetIndex : ''),
+					meta.stack
+				].join('.');
+
+				if (chart.isDatasetVisible(datasetIndex) && IDMatches(meta)) {
+					if (valuesPerStack[key] === undefined) {
+						valuesPerStack[key] = [];
+					}
+
+					data = datasets[datasetIndex].data;
+					for (i = 0, ilen = data.length; i < ilen; i++) {
+						var values = valuesPerStack[key];
+						value = me._parseValue(data[i]);
+						// invalid, hidden and negative values are ignored
+						if (isNaN(value.min) || isNaN(value.max) || meta.data[i].hidden || value.min < 0 || value.max < 0) {
+							continue;
+						}
+						values[i] = values[i] || 0;
+						values[i] += value.max;
+					}
+				}
+			}
+
+			helpers.each(valuesPerStack, function(valuesForType) {
+				if (valuesForType.length > 0) {
+					var minVal = helpers.min(valuesForType);
+					var maxVal = helpers.max(valuesForType);
+					me.min = Math.min(me.min, minVal);
+					me.max = Math.max(me.max, maxVal);
+				}
+			});
+
+		} else {
+			for (datasetIndex = 0; datasetIndex < datasets.length; datasetIndex++) {
+				meta = chart.getDatasetMeta(datasetIndex);
+				if (chart.isDatasetVisible(datasetIndex) && IDMatches(meta)) {
+					data = datasets[datasetIndex].data;
+					for (i = 0, ilen = data.length; i < ilen; i++) {
+						value = me._parseValue(data[i]);
+						// invalid, hidden and negative values are ignored
+						if (isNaN(value.min) || isNaN(value.max) || meta.data[i].hidden || value.min < 0 || value.max < 0) {
+							continue;
+						}
+
+						me.min = Math.min(value.min, me.min);
+						me.max = Math.max(value.max, me.max);
+
+						if (value.min !== 0) {
+							me.minNotZero = Math.min(value.min, me.minNotZero);
+						}
+					}
+				}
+			}
+		}
+
+		me.min = helpers.isFinite(me.min) ? me.min : null;
+		me.max = helpers.isFinite(me.max) ? me.max : null;
+		me.minNotZero = helpers.isFinite(me.minNotZero) ? me.minNotZero : null;
+
+		// Common base implementation to handle ticks.min, ticks.max
+		this.handleTickRangeOptions();
+	},
+
+	handleTickRangeOptions: function() {
+		var me = this;
+		var tickOpts = me.options.ticks;
+		var DEFAULT_MIN = 1;
+		var DEFAULT_MAX = 10;
+
+		me.min = nonNegativeOrDefault(tickOpts.min, me.min);
+		me.max = nonNegativeOrDefault(tickOpts.max, me.max);
+
+		if (me.min === me.max) {
+			if (me.min !== 0 && me.min !== null) {
+				me.min = Math.pow(10, Math.floor(log10(me.min)) - 1);
+				me.max = Math.pow(10, Math.floor(log10(me.max)) + 1);
+			} else {
+				me.min = DEFAULT_MIN;
+				me.max = DEFAULT_MAX;
+			}
+		}
+		if (me.min === null) {
+			me.min = Math.pow(10, Math.floor(log10(me.max)) - 1);
+		}
+		if (me.max === null) {
+			me.max = me.min !== 0
+				? Math.pow(10, Math.floor(log10(me.min)) + 1)
+				: DEFAULT_MAX;
+		}
+		if (me.minNotZero === null) {
+			if (me.min > 0) {
+				me.minNotZero = me.min;
+			} else if (me.max < 1) {
+				me.minNotZero = Math.pow(10, Math.floor(log10(me.max)));
+			} else {
+				me.minNotZero = DEFAULT_MIN;
+			}
+		}
+	},
+
+	buildTicks: function() {
+		var me = this;
+		var tickOpts = me.options.ticks;
+		var reverse = !me.isHorizontal();
+
+		var generationOptions = {
+			min: nonNegativeOrDefault(tickOpts.min),
+			max: nonNegativeOrDefault(tickOpts.max)
+		};
+		var ticks = me.ticks = generateTicks(generationOptions, me);
+
+		// At this point, we need to update our max and min given the tick values since we have expanded the
+		// range of the scale
+		me.max = helpers.max(ticks);
+		me.min = helpers.min(ticks);
+
+		if (tickOpts.reverse) {
+			reverse = !reverse;
+			me.start = me.max;
+			me.end = me.min;
+		} else {
+			me.start = me.min;
+			me.end = me.max;
+		}
+		if (reverse) {
+			ticks.reverse();
+		}
+	},
+
+	convertTicksToLabels: function() {
+		this.tickValues = this.ticks.slice();
+
+		Scale.prototype.convertTicksToLabels.call(this);
+	},
+
+	// Get the correct tooltip label
+	getLabelForIndex: function(index, datasetIndex) {
+		return this._getScaleLabel(this.chart.data.datasets[datasetIndex].data[index]);
+	},
+
+	getPixelForTick: function(index) {
+		var ticks = this.tickValues;
+		if (index < 0 || index > ticks.length - 1) {
+			return null;
+		}
+		return this.getPixelForValue(ticks[index]);
+	},
+
+	/**
+	 * Returns the value of the first tick.
+	 * @param {number} value - The minimum not zero value.
+	 * @return {number} The first tick value.
+	 * @private
+	 */
+	_getFirstTickValue: function(value) {
+		var exp = Math.floor(log10(value));
+		var significand = Math.floor(value / Math.pow(10, exp));
+
+		return significand * Math.pow(10, exp);
+	},
+
+	_configure: function() {
+		var me = this;
+		var start = me.min;
+		var offset = 0;
+
+		Scale.prototype._configure.call(me);
+
+		if (start === 0) {
+			start = me._getFirstTickValue(me.minNotZero);
+			offset = valueOrDefault(me.options.ticks.fontSize, defaults.global.defaultFontSize) / me._length;
+		}
+
+		me._startValue = log10(start);
+		me._valueOffset = offset;
+		me._valueRange = (log10(me.max) - log10(start)) / (1 - offset);
+	},
+
+	getPixelForValue: function(value) {
+		var me = this;
+		var decimal = 0;
+
+		value = +me.getRightValue(value);
+
+		if (value > me.min && value > 0) {
+			decimal = (log10(value) - me._startValue) / me._valueRange + me._valueOffset;
+		}
+		return me.getPixelForDecimal(decimal);
+	},
+
+	getValueForPixel: function(pixel) {
+		var me = this;
+		var decimal = me.getDecimalForPixel(pixel);
+		return decimal === 0 && me.min === 0
+			? 0
+			: Math.pow(10, me._startValue + (decimal - me._valueOffset) * me._valueRange);
+	}
+});
+
+// INTERNAL: static default options, registered in src/index.js
+module.exports._defaults = defaultConfig;

assets/chart/src/scales/scale.radialLinear.js

@@ -0,0 +1,558 @@
+'use strict';
+
+var defaults = require('../core/core.defaults');
+var helpers = require('../helpers/index');
+var LinearScaleBase = require('./scale.linearbase');
+var Ticks = require('../core/core.ticks');
+
+var valueOrDefault = helpers.valueOrDefault;
+var valueAtIndexOrDefault = helpers.valueAtIndexOrDefault;
+var resolve = helpers.options.resolve;
+
+var defaultConfig = {
+	display: true,
+
+	// Boolean - Whether to animate scaling the chart from the centre
+	animate: true,
+	position: 'chartArea',
+
+	angleLines: {
+		display: true,
+		color: 'rgba(0,0,0,0.1)',
+		lineWidth: 1,
+		borderDash: [],
+		borderDashOffset: 0.0
+	},
+
+	gridLines: {
+		circular: false
+	},
+
+	// label settings
+	ticks: {
+		// Boolean - Show a backdrop to the scale label
+		showLabelBackdrop: true,
+
+		// String - The colour of the label backdrop
+		backdropColor: 'rgba(255,255,255,0.75)',
+
+		// Number - The backdrop padding above & below the label in pixels
+		backdropPaddingY: 2,
+
+		// Number - The backdrop padding to the side of the label in pixels
+		backdropPaddingX: 2,
+
+		callback: Ticks.formatters.linear
+	},
+
+	pointLabels: {
+		// Boolean - if true, show point labels
+		display: true,
+
+		// Number - Point label font size in pixels
+		fontSize: 10,
+
+		// Function - Used to convert point labels
+		callback: function(label) {
+			return label;
+		}
+	}
+};
+
+function getTickBackdropHeight(opts) {
+	var tickOpts = opts.ticks;
+
+	if (tickOpts.display && opts.display) {
+		return valueOrDefault(tickOpts.fontSize, defaults.global.defaultFontSize) + tickOpts.backdropPaddingY * 2;
+	}
+	return 0;
+}
+
+function measureLabelSize(ctx, lineHeight, label) {
+	if (helpers.isArray(label)) {
+		return {
+			w: helpers.longestText(ctx, ctx.font, label),
+			h: label.length * lineHeight
+		};
+	}
+
+	return {
+		w: ctx.measureText(label).width,
+		h: lineHeight
+	};
+}
+
+function determineLimits(angle, pos, size, min, max) {
+	if (angle === min || angle === max) {
+		return {
+			start: pos - (size / 2),
+			end: pos + (size / 2)
+		};
+	} else if (angle < min || angle > max) {
+		return {
+			start: pos - size,
+			end: pos
+		};
+	}
+
+	return {
+		start: pos,
+		end: pos + size
+	};
+}
+
+/**
+ * Helper function to fit a radial linear scale with point labels
+ */
+function fitWithPointLabels(scale) {
+
+	// Right, this is really confusing and there is a lot of maths going on here
+	// The gist of the problem is here: https://gist.github.com/nnnick/696cc9c55f4b0beb8fe9
+	//
+	// Reaction: https://dl.dropboxusercontent.com/u/34601363/toomuchscience.gif
+	//
+	// Solution:
+	//
+	// We assume the radius of the polygon is half the size of the canvas at first
+	// at each index we check if the text overlaps.
+	//
+	// Where it does, we store that angle and that index.
+	//
+	// After finding the largest index and angle we calculate how much we need to remove
+	// from the shape radius to move the point inwards by that x.
+	//
+	// We average the left and right distances to get the maximum shape radius that can fit in the box
+	// along with labels.
+	//
+	// Once we have that, we can find the centre point for the chart, by taking the x text protrusion
+	// on each side, removing that from the size, halving it and adding the left x protrusion width.
+	//
+	// This will mean we have a shape fitted to the canvas, as large as it can be with the labels
+	// and position it in the most space efficient manner
+	//
+	// https://dl.dropboxusercontent.com/u/34601363/yeahscience.gif
+
+	var plFont = helpers.options._parseFont(scale.options.pointLabels);
+
+	// Get maximum radius of the polygon. Either half the height (minus the text width) or half the width.
+	// Use this to calculate the offset + change. - Make sure L/R protrusion is at least 0 to stop issues with centre points
+	var furthestLimits = {
+		l: 0,
+		r: scale.width,
+		t: 0,
+		b: scale.height - scale.paddingTop
+	};
+	var furthestAngles = {};
+	var i, textSize, pointPosition;
+
+	scale.ctx.font = plFont.string;
+	scale._pointLabelSizes = [];
+
+	var valueCount = scale.chart.data.labels.length;
+	for (i = 0; i < valueCount; i++) {
+		pointPosition = scale.getPointPosition(i, scale.drawingArea + 5);
+		textSize = measureLabelSize(scale.ctx, plFont.lineHeight, scale.pointLabels[i]);
+		scale._pointLabelSizes[i] = textSize;
+
+		// Add quarter circle to make degree 0 mean top of circle
+		var angleRadians = scale.getIndexAngle(i);
+		var angle = helpers.toDegrees(angleRadians) % 360;
+		var hLimits = determineLimits(angle, pointPosition.x, textSize.w, 0, 180);
+		var vLimits = determineLimits(angle, pointPosition.y, textSize.h, 90, 270);
+
+		if (hLimits.start < furthestLimits.l) {
+			furthestLimits.l = hLimits.start;
+			furthestAngles.l = angleRadians;
+		}
+
+		if (hLimits.end > furthestLimits.r) {
+			furthestLimits.r = hLimits.end;
+			furthestAngles.r = angleRadians;
+		}
+
+		if (vLimits.start < furthestLimits.t) {
+			furthestLimits.t = vLimits.start;
+			furthestAngles.t = angleRadians;
+		}
+
+		if (vLimits.end > furthestLimits.b) {
+			furthestLimits.b = vLimits.end;
+			furthestAngles.b = angleRadians;
+		}
+	}
+
+	scale.setReductions(scale.drawingArea, furthestLimits, furthestAngles);
+}
+
+function getTextAlignForAngle(angle) {
+	if (angle === 0 || angle === 180) {
+		return 'center';
+	} else if (angle < 180) {
+		return 'left';
+	}
+
+	return 'right';
+}
+
+function fillText(ctx, text, position, lineHeight) {
+	var y = position.y + lineHeight / 2;
+	var i, ilen;
+
+	if (helpers.isArray(text)) {
+		for (i = 0, ilen = text.length; i < ilen; ++i) {
+			ctx.fillText(text[i], position.x, y);
+			y += lineHeight;
+		}
+	} else {
+		ctx.fillText(text, position.x, y);
+	}
+}
+
+function adjustPointPositionForLabelHeight(angle, textSize, position) {
+	if (angle === 90 || angle === 270) {
+		position.y -= (textSize.h / 2);
+	} else if (angle > 270 || angle < 90) {
+		position.y -= textSize.h;
+	}
+}
+
+function drawPointLabels(scale) {
+	var ctx = scale.ctx;
+	var opts = scale.options;
+	var pointLabelOpts = opts.pointLabels;
+	var tickBackdropHeight = getTickBackdropHeight(opts);
+	var outerDistance = scale.getDistanceFromCenterForValue(opts.ticks.reverse ? scale.min : scale.max);
+	var plFont = helpers.options._parseFont(pointLabelOpts);
+
+	ctx.save();
+
+	ctx.font = plFont.string;
+	ctx.textBaseline = 'middle';
+
+	for (var i = scale.chart.data.labels.length - 1; i >= 0; i--) {
+		// Extra pixels out for some label spacing
+		var extra = (i === 0 ? tickBackdropHeight / 2 : 0);
+		var pointLabelPosition = scale.getPointPosition(i, outerDistance + extra + 5);
+
+		// Keep this in loop since we may support array properties here
+		var pointLabelFontColor = valueAtIndexOrDefault(pointLabelOpts.fontColor, i, defaults.global.defaultFontColor);
+		ctx.fillStyle = pointLabelFontColor;
+
+		var angleRadians = scale.getIndexAngle(i);
+		var angle = helpers.toDegrees(angleRadians);
+		ctx.textAlign = getTextAlignForAngle(angle);
+		adjustPointPositionForLabelHeight(angle, scale._pointLabelSizes[i], pointLabelPosition);
+		fillText(ctx, scale.pointLabels[i], pointLabelPosition, plFont.lineHeight);
+	}
+	ctx.restore();
+}
+
+function drawRadiusLine(scale, gridLineOpts, radius, index) {
+	var ctx = scale.ctx;
+	var circular = gridLineOpts.circular;
+	var valueCount = scale.chart.data.labels.length;
+	var lineColor = valueAtIndexOrDefault(gridLineOpts.color, index - 1);
+	var lineWidth = valueAtIndexOrDefault(gridLineOpts.lineWidth, index - 1);
+	var pointPosition;
+
+	if ((!circular && !valueCount) || !lineColor || !lineWidth) {
+		return;
+	}
+
+	ctx.save();
+	ctx.strokeStyle = lineColor;
+	ctx.lineWidth = lineWidth;
+	if (ctx.setLineDash) {
+		ctx.setLineDash(gridLineOpts.borderDash || []);
+		ctx.lineDashOffset = gridLineOpts.borderDashOffset || 0.0;
+	}
+
+	ctx.beginPath();
+	if (circular) {
+		// Draw circular arcs between the points
+		ctx.arc(scale.xCenter, scale.yCenter, radius, 0, Math.PI * 2);
+	} else {
+		// Draw straight lines connecting each index
+		pointPosition = scale.getPointPosition(0, radius);
+		ctx.moveTo(pointPosition.x, pointPosition.y);
+
+		for (var i = 1; i < valueCount; i++) {
+			pointPosition = scale.getPointPosition(i, radius);
+			ctx.lineTo(pointPosition.x, pointPosition.y);
+		}
+	}
+	ctx.closePath();
+	ctx.stroke();
+	ctx.restore();
+}
+
+function numberOrZero(param) {
+	return helpers.isNumber(param) ? param : 0;
+}
+
+module.exports = LinearScaleBase.extend({
+	setDimensions: function() {
+		var me = this;
+
+		// Set the unconstrained dimension before label rotation
+		me.width = me.maxWidth;
+		me.height = me.maxHeight;
+		me.paddingTop = getTickBackdropHeight(me.options) / 2;
+		me.xCenter = Math.floor(me.width / 2);
+		me.yCenter = Math.floor((me.height - me.paddingTop) / 2);
+		me.drawingArea = Math.min(me.height - me.paddingTop, me.width) / 2;
+	},
+
+	determineDataLimits: function() {
+		var me = this;
+		var chart = me.chart;
+		var min = Number.POSITIVE_INFINITY;
+		var max = Number.NEGATIVE_INFINITY;
+
+		helpers.each(chart.data.datasets, function(dataset, datasetIndex) {
+			if (chart.isDatasetVisible(datasetIndex)) {
+				var meta = chart.getDatasetMeta(datasetIndex);
+
+				helpers.each(dataset.data, function(rawValue, index) {
+					var value = +me.getRightValue(rawValue);
+					if (isNaN(value) || meta.data[index].hidden) {
+						return;
+					}
+
+					min = Math.min(value, min);
+					max = Math.max(value, max);
+				});
+			}
+		});
+
+		me.min = (min === Number.POSITIVE_INFINITY ? 0 : min);
+		me.max = (max === Number.NEGATIVE_INFINITY ? 0 : max);
+
+		// Common base implementation to handle ticks.min, ticks.max, ticks.beginAtZero
+		me.handleTickRangeOptions();
+	},
+
+	// Returns the maximum number of ticks based on the scale dimension
+	_computeTickLimit: function() {
+		return Math.ceil(this.drawingArea / getTickBackdropHeight(this.options));
+	},
+
+	convertTicksToLabels: function() {
+		var me = this;
+
+		LinearScaleBase.prototype.convertTicksToLabels.call(me);
+
+		// Point labels
+		me.pointLabels = me.chart.data.labels.map(function() {
+			var label = helpers.callback(me.options.pointLabels.callback, arguments, me);
+			return label || label === 0 ? label : '';
+		});
+	},
+
+	getLabelForIndex: function(index, datasetIndex) {
+		return +this.getRightValue(this.chart.data.datasets[datasetIndex].data[index]);
+	},
+
+	fit: function() {
+		var me = this;
+		var opts = me.options;
+
+		if (opts.display && opts.pointLabels.display) {
+			fitWithPointLabels(me);
+		} else {
+			me.setCenterPoint(0, 0, 0, 0);
+		}
+	},
+
+	/**
+	 * Set radius reductions and determine new radius and center point
+	 * @private
+	 */
+	setReductions: function(largestPossibleRadius, furthestLimits, furthestAngles) {
+		var me = this;
+		var radiusReductionLeft = furthestLimits.l / Math.sin(furthestAngles.l);
+		var radiusReductionRight = Math.max(furthestLimits.r - me.width, 0) / Math.sin(furthestAngles.r);
+		var radiusReductionTop = -furthestLimits.t / Math.cos(furthestAngles.t);
+		var radiusReductionBottom = -Math.max(furthestLimits.b - (me.height - me.paddingTop), 0) / Math.cos(furthestAngles.b);
+
+		radiusReductionLeft = numberOrZero(radiusReductionLeft);
+		radiusReductionRight = numberOrZero(radiusReductionRight);
+		radiusReductionTop = numberOrZero(radiusReductionTop);
+		radiusReductionBottom = numberOrZero(radiusReductionBottom);
+
+		me.drawingArea = Math.min(
+			Math.floor(largestPossibleRadius - (radiusReductionLeft + radiusReductionRight) / 2),
+			Math.floor(largestPossibleRadius - (radiusReductionTop + radiusReductionBottom) / 2));
+		me.setCenterPoint(radiusReductionLeft, radiusReductionRight, radiusReductionTop, radiusReductionBottom);
+	},
+
+	setCenterPoint: function(leftMovement, rightMovement, topMovement, bottomMovement) {
+		var me = this;
+		var maxRight = me.width - rightMovement - me.drawingArea;
+		var maxLeft = leftMovement + me.drawingArea;
+		var maxTop = topMovement + me.drawingArea;
+		var maxBottom = (me.height - me.paddingTop) - bottomMovement - me.drawingArea;
+
+		me.xCenter = Math.floor(((maxLeft + maxRight) / 2) + me.left);
+		me.yCenter = Math.floor(((maxTop + maxBottom) / 2) + me.top + me.paddingTop);
+	},
+
+	getIndexAngle: function(index) {
+		var chart = this.chart;
+		var angleMultiplier = 360 / chart.data.labels.length;
+		var options = chart.options || {};
+		var startAngle = options.startAngle || 0;
+
+		// Start from the top instead of right, so remove a quarter of the circle
+		var angle = (index * angleMultiplier + startAngle) % 360;
+
+		return (angle < 0 ? angle + 360 : angle) * Math.PI * 2 / 360;
+	},
+
+	getDistanceFromCenterForValue: function(value) {
+		var me = this;
+
+		if (helpers.isNullOrUndef(value)) {
+			return NaN;
+		}
+
+		// Take into account half font size + the yPadding of the top value
+		var scalingFactor = me.drawingArea / (me.max - me.min);
+		if (me.options.ticks.reverse) {
+			return (me.max - value) * scalingFactor;
+		}
+		return (value - me.min) * scalingFactor;
+	},
+
+	getPointPosition: function(index, distanceFromCenter) {
+		var me = this;
+		var thisAngle = me.getIndexAngle(index) - (Math.PI / 2);
+		return {
+			x: Math.cos(thisAngle) * distanceFromCenter + me.xCenter,
+			y: Math.sin(thisAngle) * distanceFromCenter + me.yCenter
+		};
+	},
+
+	getPointPositionForValue: function(index, value) {
+		return this.getPointPosition(index, this.getDistanceFromCenterForValue(value));
+	},
+
+	getBasePosition: function(index) {
+		var me = this;
+		var min = me.min;
+		var max = me.max;
+
+		return me.getPointPositionForValue(index || 0,
+			me.beginAtZero ? 0 :
+			min < 0 && max < 0 ? max :
+			min > 0 && max > 0 ? min :
+			0);
+	},
+
+	/**
+	 * @private
+	 */
+	_drawGrid: function() {
+		var me = this;
+		var ctx = me.ctx;
+		var opts = me.options;
+		var gridLineOpts = opts.gridLines;
+		var angleLineOpts = opts.angleLines;
+		var lineWidth = valueOrDefault(angleLineOpts.lineWidth, gridLineOpts.lineWidth);
+		var lineColor = valueOrDefault(angleLineOpts.color, gridLineOpts.color);
+		var i, offset, position;
+
+		if (opts.pointLabels.display) {
+			drawPointLabels(me);
+		}
+
+		if (gridLineOpts.display) {
+			helpers.each(me.ticks, function(label, index) {
+				if (index !== 0) {
+					offset = me.getDistanceFromCenterForValue(me.ticksAsNumbers[index]);
+					drawRadiusLine(me, gridLineOpts, offset, index);
+				}
+			});
+		}
+
+		if (angleLineOpts.display && lineWidth && lineColor) {
+			ctx.save();
+			ctx.lineWidth = lineWidth;
+			ctx.strokeStyle = lineColor;
+			if (ctx.setLineDash) {
+				ctx.setLineDash(resolve([angleLineOpts.borderDash, gridLineOpts.borderDash, []]));
+				ctx.lineDashOffset = resolve([angleLineOpts.borderDashOffset, gridLineOpts.borderDashOffset, 0.0]);
+			}
+
+			for (i = me.chart.data.labels.length - 1; i >= 0; i--) {
+				offset = me.getDistanceFromCenterForValue(opts.ticks.reverse ? me.min : me.max);
+				position = me.getPointPosition(i, offset);
+				ctx.beginPath();
+				ctx.moveTo(me.xCenter, me.yCenter);
+				ctx.lineTo(position.x, position.y);
+				ctx.stroke();
+			}
+
+			ctx.restore();
+		}
+	},
+
+	/**
+	 * @private
+	 */
+	_drawLabels: function() {
+		var me = this;
+		var ctx = me.ctx;
+		var opts = me.options;
+		var tickOpts = opts.ticks;
+
+		if (!tickOpts.display) {
+			return;
+		}
+
+		var startAngle = me.getIndexAngle(0);
+		var tickFont = helpers.options._parseFont(tickOpts);
+		var tickFontColor = valueOrDefault(tickOpts.fontColor, defaults.global.defaultFontColor);
+		var offset, width;
+
+		ctx.save();
+		ctx.font = tickFont.string;
+		ctx.translate(me.xCenter, me.yCenter);
+		ctx.rotate(startAngle);
+		ctx.textAlign = 'center';
+		ctx.textBaseline = 'middle';
+
+		helpers.each(me.ticks, function(label, index) {
+			if (index === 0 && !tickOpts.reverse) {
+				return;
+			}
+
+			offset = me.getDistanceFromCenterForValue(me.ticksAsNumbers[index]);
+
+			if (tickOpts.showLabelBackdrop) {
+				width = ctx.measureText(label).width;
+				ctx.fillStyle = tickOpts.backdropColor;
+
+				ctx.fillRect(
+					-width / 2 - tickOpts.backdropPaddingX,
+					-offset - tickFont.size / 2 - tickOpts.backdropPaddingY,
+					width + tickOpts.backdropPaddingX * 2,
+					tickFont.size + tickOpts.backdropPaddingY * 2
+				);
+			}
+
+			ctx.fillStyle = tickFontColor;
+			ctx.fillText(label, 0, -offset);
+		});
+
+		ctx.restore();
+	},
+
+	/**
+	 * @private
+	 */
+	_drawTitle: helpers.noop
+});
+
+// INTERNAL: static default options, registered in src/index.js
+module.exports._defaults = defaultConfig;

assets/chart/src/scales/scale.time.js

@@ -0,0 +1,764 @@
+'use strict';
+
+var adapters = require('../core/core.adapters');
+var defaults = require('../core/core.defaults');
+var helpers = require('../helpers/index');
+var Scale = require('../core/core.scale');
+
+var deprecated = helpers._deprecated;
+var resolve = helpers.options.resolve;
+var valueOrDefault = helpers.valueOrDefault;
+
+// Integer constants are from the ES6 spec.
+var MIN_INTEGER = Number.MIN_SAFE_INTEGER || -9007199254740991;
+var MAX_INTEGER = Number.MAX_SAFE_INTEGER || 9007199254740991;
+
+var INTERVALS = {
+	millisecond: {
+		common: true,
+		size: 1,
+		steps: 1000
+	},
+	second: {
+		common: true,
+		size: 1000,
+		steps: 60
+	},
+	minute: {
+		common: true,
+		size: 60000,
+		steps: 60
+	},
+	hour: {
+		common: true,
+		size: 3600000,
+		steps: 24
+	},
+	day: {
+		common: true,
+		size: 86400000,
+		steps: 30
+	},
+	week: {
+		common: false,
+		size: 604800000,
+		steps: 4
+	},
+	month: {
+		common: true,
+		size: 2.628e9,
+		steps: 12
+	},
+	quarter: {
+		common: false,
+		size: 7.884e9,
+		steps: 4
+	},
+	year: {
+		common: true,
+		size: 3.154e10
+	}
+};
+
+var UNITS = Object.keys(INTERVALS);
+
+function sorter(a, b) {
+	return a - b;
+}
+
+function arrayUnique(items) {
+	var hash = {};
+	var out = [];
+	var i, ilen, item;
+
+	for (i = 0, ilen = items.length; i < ilen; ++i) {
+		item = items[i];
+		if (!hash[item]) {
+			hash[item] = true;
+			out.push(item);
+		}
+	}
+
+	return out;
+}
+
+function getMin(options) {
+	return helpers.valueOrDefault(options.time.min, options.ticks.min);
+}
+
+function getMax(options) {
+	return helpers.valueOrDefault(options.time.max, options.ticks.max);
+}
+
+/**
+ * Returns an array of {time, pos} objects used to interpolate a specific `time` or position
+ * (`pos`) on the scale, by searching entries before and after the requested value. `pos` is
+ * a decimal between 0 and 1: 0 being the start of the scale (left or top) and 1 the other
+ * extremity (left + width or top + height). Note that it would be more optimized to directly
+ * store pre-computed pixels, but the scale dimensions are not guaranteed at the time we need
+ * to create the lookup table. The table ALWAYS contains at least two items: min and max.
+ *
+ * @param {number[]} timestamps - timestamps sorted from lowest to highest.
+ * @param {string} distribution - If 'linear', timestamps will be spread linearly along the min
+ * and max range, so basically, the table will contains only two items: {min, 0} and {max, 1}.
+ * If 'series', timestamps will be positioned at the same distance from each other. In this
+ * case, only timestamps that break the time linearity are registered, meaning that in the
+ * best case, all timestamps are linear, the table contains only min and max.
+ */
+function buildLookupTable(timestamps, min, max, distribution) {
+	if (distribution === 'linear' || !timestamps.length) {
+		return [
+			{time: min, pos: 0},
+			{time: max, pos: 1}
+		];
+	}
+
+	var table = [];
+	var items = [min];
+	var i, ilen, prev, curr, next;
+
+	for (i = 0, ilen = timestamps.length; i < ilen; ++i) {
+		curr = timestamps[i];
+		if (curr > min && curr < max) {
+			items.push(curr);
+		}
+	}
+
+	items.push(max);
+
+	for (i = 0, ilen = items.length; i < ilen; ++i) {
+		next = items[i + 1];
+		prev = items[i - 1];
+		curr = items[i];
+
+		// only add points that breaks the scale linearity
+		if (prev === undefined || next === undefined || Math.round((next + prev) / 2) !== curr) {
+			table.push({time: curr, pos: i / (ilen - 1)});
+		}
+	}
+
+	return table;
+}
+
+// @see adapted from https://www.anujgakhar.com/2014/03/01/binary-search-in-javascript/
+function lookup(table, key, value) {
+	var lo = 0;
+	var hi = table.length - 1;
+	var mid, i0, i1;
+
+	while (lo >= 0 && lo <= hi) {
+		mid = (lo + hi) >> 1;
+		i0 = table[mid - 1] || null;
+		i1 = table[mid];
+
+		if (!i0) {
+			// given value is outside table (before first item)
+			return {lo: null, hi: i1};
+		} else if (i1[key] < value) {
+			lo = mid + 1;
+		} else if (i0[key] > value) {
+			hi = mid - 1;
+		} else {
+			return {lo: i0, hi: i1};
+		}
+	}
+
+	// given value is outside table (after last item)
+	return {lo: i1, hi: null};
+}
+
+/**
+ * Linearly interpolates the given source `value` using the table items `skey` values and
+ * returns the associated `tkey` value. For example, interpolate(table, 'time', 42, 'pos')
+ * returns the position for a timestamp equal to 42. If value is out of bounds, values at
+ * index [0, 1] or [n - 1, n] are used for the interpolation.
+ */
+function interpolate(table, skey, sval, tkey) {
+	var range = lookup(table, skey, sval);
+
+	// Note: the lookup table ALWAYS contains at least 2 items (min and max)
+	var prev = !range.lo ? table[0] : !range.hi ? table[table.length - 2] : range.lo;
+	var next = !range.lo ? table[1] : !range.hi ? table[table.length - 1] : range.hi;
+
+	var span = next[skey] - prev[skey];
+	var ratio = span ? (sval - prev[skey]) / span : 0;
+	var offset = (next[tkey] - prev[tkey]) * ratio;
+
+	return prev[tkey] + offset;
+}
+
+function toTimestamp(scale, input) {
+	var adapter = scale._adapter;
+	var options = scale.options.time;
+	var parser = options.parser;
+	var format = parser || options.format;
+	var value = input;
+
+	if (typeof parser === 'function') {
+		value = parser(value);
+	}
+
+	// Only parse if its not a timestamp already
+	if (!helpers.isFinite(value)) {
+		value = typeof format === 'string'
+			? adapter.parse(value, format)
+			: adapter.parse(value);
+	}
+
+	if (value !== null) {
+		return +value;
+	}
+
+	// Labels are in an incompatible format and no `parser` has been provided.
+	// The user might still use the deprecated `format` option for parsing.
+	if (!parser && typeof format === 'function') {
+		value = format(input);
+
+		// `format` could return something else than a timestamp, if so, parse it
+		if (!helpers.isFinite(value)) {
+			value = adapter.parse(value);
+		}
+	}
+
+	return value;
+}
+
+function parse(scale, input) {
+	if (helpers.isNullOrUndef(input)) {
+		return null;
+	}
+
+	var options = scale.options.time;
+	var value = toTimestamp(scale, scale.getRightValue(input));
+	if (value === null) {
+		return value;
+	}
+
+	if (options.round) {
+		value = +scale._adapter.startOf(value, options.round);
+	}
+
+	return value;
+}
+
+/**
+ * Figures out what unit results in an appropriate number of auto-generated ticks
+ */
+function determineUnitForAutoTicks(minUnit, min, max, capacity) {
+	var ilen = UNITS.length;
+	var i, interval, factor;
+
+	for (i = UNITS.indexOf(minUnit); i < ilen - 1; ++i) {
+		interval = INTERVALS[UNITS[i]];
+		factor = interval.steps ? interval.steps : MAX_INTEGER;
+
+		if (interval.common && Math.ceil((max - min) / (factor * interval.size)) <= capacity) {
+			return UNITS[i];
+		}
+	}
+
+	return UNITS[ilen - 1];
+}
+
+/**
+ * Figures out what unit to format a set of ticks with
+ */
+function determineUnitForFormatting(scale, numTicks, minUnit, min, max) {
+	var i, unit;
+
+	for (i = UNITS.length - 1; i >= UNITS.indexOf(minUnit); i--) {
+		unit = UNITS[i];
+		if (INTERVALS[unit].common && scale._adapter.diff(max, min, unit) >= numTicks - 1) {
+			return unit;
+		}
+	}
+
+	return UNITS[minUnit ? UNITS.indexOf(minUnit) : 0];
+}
+
+function determineMajorUnit(unit) {
+	for (var i = UNITS.indexOf(unit) + 1, ilen = UNITS.length; i < ilen; ++i) {
+		if (INTERVALS[UNITS[i]].common) {
+			return UNITS[i];
+		}
+	}
+}
+
+/**
+ * Generates a maximum of `capacity` timestamps between min and max, rounded to the
+ * `minor` unit using the given scale time `options`.
+ * Important: this method can return ticks outside the min and max range, it's the
+ * responsibility of the calling code to clamp values if needed.
+ */
+function generate(scale, min, max, capacity) {
+	var adapter = scale._adapter;
+	var options = scale.options;
+	var timeOpts = options.time;
+	var minor = timeOpts.unit || determineUnitForAutoTicks(timeOpts.minUnit, min, max, capacity);
+	var stepSize = resolve([timeOpts.stepSize, timeOpts.unitStepSize, 1]);
+	var weekday = minor === 'week' ? timeOpts.isoWeekday : false;
+	var first = min;
+	var ticks = [];
+	var time;
+
+	// For 'week' unit, handle the first day of week option
+	if (weekday) {
+		first = +adapter.startOf(first, 'isoWeek', weekday);
+	}
+
+	// Align first ticks on unit
+	first = +adapter.startOf(first, weekday ? 'day' : minor);
+
+	// Prevent browser from freezing in case user options request millions of milliseconds
+	if (adapter.diff(max, min, minor) > 100000 * stepSize) {
+		throw min + ' and ' + max + ' are too far apart with stepSize of ' + stepSize + ' ' + minor;
+	}
+
+	for (time = first; time < max; time = +adapter.add(time, stepSize, minor)) {
+		ticks.push(time);
+	}
+
+	if (time === max || options.bounds === 'ticks') {
+		ticks.push(time);
+	}
+
+	return ticks;
+}
+
+/**
+ * Returns the start and end offsets from edges in the form of {start, end}
+ * where each value is a relative width to the scale and ranges between 0 and 1.
+ * They add extra margins on the both sides by scaling down the original scale.
+ * Offsets are added when the `offset` option is true.
+ */
+function computeOffsets(table, ticks, min, max, options) {
+	var start = 0;
+	var end = 0;
+	var first, last;
+
+	if (options.offset && ticks.length) {
+		first = interpolate(table, 'time', ticks[0], 'pos');
+		if (ticks.length === 1) {
+			start = 1 - first;
+		} else {
+			start = (interpolate(table, 'time', ticks[1], 'pos') - first) / 2;
+		}
+		last = interpolate(table, 'time', ticks[ticks.length - 1], 'pos');
+		if (ticks.length === 1) {
+			end = last;
+		} else {
+			end = (last - interpolate(table, 'time', ticks[ticks.length - 2], 'pos')) / 2;
+		}
+	}
+
+	return {start: start, end: end, factor: 1 / (start + 1 + end)};
+}
+
+function setMajorTicks(scale, ticks, map, majorUnit) {
+	var adapter = scale._adapter;
+	var first = +adapter.startOf(ticks[0].value, majorUnit);
+	var last = ticks[ticks.length - 1].value;
+	var major, index;
+
+	for (major = first; major <= last; major = +adapter.add(major, 1, majorUnit)) {
+		index = map[major];
+		if (index >= 0) {
+			ticks[index].major = true;
+		}
+	}
+	return ticks;
+}
+
+function ticksFromTimestamps(scale, values, majorUnit) {
+	var ticks = [];
+	var map = {};
+	var ilen = values.length;
+	var i, value;
+
+	for (i = 0; i < ilen; ++i) {
+		value = values[i];
+		map[value] = i;
+
+		ticks.push({
+			value: value,
+			major: false
+		});
+	}
+
+	// We set the major ticks separately from the above loop because calling startOf for every tick
+	// is expensive when there is a large number of ticks
+	return (ilen === 0 || !majorUnit) ? ticks : setMajorTicks(scale, ticks, map, majorUnit);
+}
+
+var defaultConfig = {
+	position: 'bottom',
+
+	/**
+	 * Data distribution along the scale:
+	 * - 'linear': data are spread according to their time (distances can vary),
+	 * - 'series': data are spread at the same distance from each other.
+	 * @see https://github.com/chartjs/Chart.js/pull/4507
+	 * @since 2.7.0
+	 */
+	distribution: 'linear',
+
+	/**
+	 * Scale boundary strategy (bypassed by min/max time options)
+	 * - `data`: make sure data are fully visible, ticks outside are removed
+	 * - `ticks`: make sure ticks are fully visible, data outside are truncated
+	 * @see https://github.com/chartjs/Chart.js/pull/4556
+	 * @since 2.7.0
+	 */
+	bounds: 'data',
+
+	adapters: {},
+	time: {
+		parser: false, // false == a pattern string from https://momentjs.com/docs/#/parsing/string-format/ or a custom callback that converts its argument to a moment
+		unit: false, // false == automatic or override with week, month, year, etc.
+		round: false, // none, or override with week, month, year, etc.
+		displayFormat: false, // DEPRECATED
+		isoWeekday: false, // override week start day - see https://momentjs.com/docs/#/get-set/iso-weekday/
+		minUnit: 'millisecond',
+		displayFormats: {}
+	},
+	ticks: {
+		autoSkip: false,
+
+		/**
+		 * Ticks generation input values:
+		 * - 'auto': generates "optimal" ticks based on scale size and time options.
+		 * - 'data': generates ticks from data (including labels from data {t|x|y} objects).
+		 * - 'labels': generates ticks from user given `data.labels` values ONLY.
+		 * @see https://github.com/chartjs/Chart.js/pull/4507
+		 * @since 2.7.0
+		 */
+		source: 'auto',
+
+		major: {
+			enabled: false
+		}
+	}
+};
+
+module.exports = Scale.extend({
+	initialize: function() {
+		this.mergeTicksOptions();
+		Scale.prototype.initialize.call(this);
+	},
+
+	update: function() {
+		var me = this;
+		var options = me.options;
+		var time = options.time || (options.time = {});
+		var adapter = me._adapter = new adapters._date(options.adapters.date);
+
+		// DEPRECATIONS: output a message only one time per update
+		deprecated('time scale', time.format, 'time.format', 'time.parser');
+		deprecated('time scale', time.min, 'time.min', 'ticks.min');
+		deprecated('time scale', time.max, 'time.max', 'ticks.max');
+
+		// Backward compatibility: before introducing adapter, `displayFormats` was
+		// supposed to contain *all* unit/string pairs but this can't be resolved
+		// when loading the scale (adapters are loaded afterward), so let's populate
+		// missing formats on update
+		helpers.mergeIf(time.displayFormats, adapter.formats());
+
+		return Scale.prototype.update.apply(me, arguments);
+	},
+
+	/**
+	 * Allows data to be referenced via 't' attribute
+	 */
+	getRightValue: function(rawValue) {
+		if (rawValue && rawValue.t !== undefined) {
+			rawValue = rawValue.t;
+		}
+		return Scale.prototype.getRightValue.call(this, rawValue);
+	},
+
+	determineDataLimits: function() {
+		var me = this;
+		var chart = me.chart;
+		var adapter = me._adapter;
+		var options = me.options;
+		var unit = options.time.unit || 'day';
+		var min = MAX_INTEGER;
+		var max = MIN_INTEGER;
+		var timestamps = [];
+		var datasets = [];
+		var labels = [];
+		var i, j, ilen, jlen, data, timestamp, labelsAdded;
+		var dataLabels = me._getLabels();
+
+		for (i = 0, ilen = dataLabels.length; i < ilen; ++i) {
+			labels.push(parse(me, dataLabels[i]));
+		}
+
+		for (i = 0, ilen = (chart.data.datasets || []).length; i < ilen; ++i) {
+			if (chart.isDatasetVisible(i)) {
+				data = chart.data.datasets[i].data;
+
+				// Let's consider that all data have the same format.
+				if (helpers.isObject(data[0])) {
+					datasets[i] = [];
+
+					for (j = 0, jlen = data.length; j < jlen; ++j) {
+						timestamp = parse(me, data[j]);
+						timestamps.push(timestamp);
+						datasets[i][j] = timestamp;
+					}
+				} else {
+					datasets[i] = labels.slice(0);
+					if (!labelsAdded) {
+						timestamps = timestamps.concat(labels);
+						labelsAdded = true;
+					}
+				}
+			} else {
+				datasets[i] = [];
+			}
+		}
+
+		if (labels.length) {
+			min = Math.min(min, labels[0]);
+			max = Math.max(max, labels[labels.length - 1]);
+		}
+
+		if (timestamps.length) {
+			timestamps = ilen > 1 ? arrayUnique(timestamps).sort(sorter) : timestamps.sort(sorter);
+			min = Math.min(min, timestamps[0]);
+			max = Math.max(max, timestamps[timestamps.length - 1]);
+		}
+
+		min = parse(me, getMin(options)) || min;
+		max = parse(me, getMax(options)) || max;
+
+		// In case there is no valid min/max, set limits based on unit time option
+		min = min === MAX_INTEGER ? +adapter.startOf(Date.now(), unit) : min;
+		max = max === MIN_INTEGER ? +adapter.endOf(Date.now(), unit) + 1 : max;
+
+		// Make sure that max is strictly higher than min (required by the lookup table)
+		me.min = Math.min(min, max);
+		me.max = Math.max(min + 1, max);
+
+		// PRIVATE
+		me._table = [];
+		me._timestamps = {
+			data: timestamps,
+			datasets: datasets,
+			labels: labels
+		};
+	},
+
+	buildTicks: function() {
+		var me = this;
+		var min = me.min;
+		var max = me.max;
+		var options = me.options;
+		var tickOpts = options.ticks;
+		var timeOpts = options.time;
+		var timestamps = me._timestamps;
+		var ticks = [];
+		var capacity = me.getLabelCapacity(min);
+		var source = tickOpts.source;
+		var distribution = options.distribution;
+		var i, ilen, timestamp;
+
+		if (source === 'data' || (source === 'auto' && distribution === 'series')) {
+			timestamps = timestamps.data;
+		} else if (source === 'labels') {
+			timestamps = timestamps.labels;
+		} else {
+			timestamps = generate(me, min, max, capacity, options);
+		}
+
+		if (options.bounds === 'ticks' && timestamps.length) {
+			min = timestamps[0];
+			max = timestamps[timestamps.length - 1];
+		}
+
+		// Enforce limits with user min/max options
+		min = parse(me, getMin(options)) || min;
+		max = parse(me, getMax(options)) || max;
+
+		// Remove ticks outside the min/max range
+		for (i = 0, ilen = timestamps.length; i < ilen; ++i) {
+			timestamp = timestamps[i];
+			if (timestamp >= min && timestamp <= max) {
+				ticks.push(timestamp);
+			}
+		}
+
+		me.min = min;
+		me.max = max;
+
+		// PRIVATE
+		// determineUnitForFormatting relies on the number of ticks so we don't use it when
+		// autoSkip is enabled because we don't yet know what the final number of ticks will be
+		me._unit = timeOpts.unit || (tickOpts.autoSkip
+			? determineUnitForAutoTicks(timeOpts.minUnit, me.min, me.max, capacity)
+			: determineUnitForFormatting(me, ticks.length, timeOpts.minUnit, me.min, me.max));
+		me._majorUnit = !tickOpts.major.enabled || me._unit === 'year' ? undefined
+			: determineMajorUnit(me._unit);
+		me._table = buildLookupTable(me._timestamps.data, min, max, distribution);
+		me._offsets = computeOffsets(me._table, ticks, min, max, options);
+
+		if (tickOpts.reverse) {
+			ticks.reverse();
+		}
+
+		return ticksFromTimestamps(me, ticks, me._majorUnit);
+	},
+
+	getLabelForIndex: function(index, datasetIndex) {
+		var me = this;
+		var adapter = me._adapter;
+		var data = me.chart.data;
+		var timeOpts = me.options.time;
+		var label = data.labels && index < data.labels.length ? data.labels[index] : '';
+		var value = data.datasets[datasetIndex].data[index];
+
+		if (helpers.isObject(value)) {
+			label = me.getRightValue(value);
+		}
+		if (timeOpts.tooltipFormat) {
+			return adapter.format(toTimestamp(me, label), timeOpts.tooltipFormat);
+		}
+		if (typeof label === 'string') {
+			return label;
+		}
+		return adapter.format(toTimestamp(me, label), timeOpts.displayFormats.datetime);
+	},
+
+	/**
+	 * Function to format an individual tick mark
+	 * @private
+	 */
+	tickFormatFunction: function(time, index, ticks, format) {
+		var me = this;
+		var adapter = me._adapter;
+		var options = me.options;
+		var formats = options.time.displayFormats;
+		var minorFormat = formats[me._unit];
+		var majorUnit = me._majorUnit;
+		var majorFormat = formats[majorUnit];
+		var tick = ticks[index];
+		var tickOpts = options.ticks;
+		var major = majorUnit && majorFormat && tick && tick.major;
+		var label = adapter.format(time, format ? format : major ? majorFormat : minorFormat);
+		var nestedTickOpts = major ? tickOpts.major : tickOpts.minor;
+		var formatter = resolve([
+			nestedTickOpts.callback,
+			nestedTickOpts.userCallback,
+			tickOpts.callback,
+			tickOpts.userCallback
+		]);
+
+		return formatter ? formatter(label, index, ticks) : label;
+	},
+
+	convertTicksToLabels: function(ticks) {
+		var labels = [];
+		var i, ilen;
+
+		for (i = 0, ilen = ticks.length; i < ilen; ++i) {
+			labels.push(this.tickFormatFunction(ticks[i].value, i, ticks));
+		}
+
+		return labels;
+	},
+
+	/**
+	 * @private
+	 */
+	getPixelForOffset: function(time) {
+		var me = this;
+		var offsets = me._offsets;
+		var pos = interpolate(me._table, 'time', time, 'pos');
+		return me.getPixelForDecimal((offsets.start + pos) * offsets.factor);
+	},
+
+	getPixelForValue: function(value, index, datasetIndex) {
+		var me = this;
+		var time = null;
+
+		if (index !== undefined && datasetIndex !== undefined) {
+			time = me._timestamps.datasets[datasetIndex][index];
+		}
+
+		if (time === null) {
+			time = parse(me, value);
+		}
+
+		if (time !== null) {
+			return me.getPixelForOffset(time);
+		}
+	},
+
+	getPixelForTick: function(index) {
+		var ticks = this.getTicks();
+		return index >= 0 && index < ticks.length ?
+			this.getPixelForOffset(ticks[index].value) :
+			null;
+	},
+
+	getValueForPixel: function(pixel) {
+		var me = this;
+		var offsets = me._offsets;
+		var pos = me.getDecimalForPixel(pixel) / offsets.factor - offsets.end;
+		var time = interpolate(me._table, 'pos', pos, 'time');
+
+		// DEPRECATION, we should return time directly
+		return me._adapter._create(time);
+	},
+
+	/**
+	 * @private
+	 */
+	_getLabelSize: function(label) {
+		var me = this;
+		var ticksOpts = me.options.ticks;
+		var tickLabelWidth = me.ctx.measureText(label).width;
+		var angle = helpers.toRadians(me.isHorizontal() ? ticksOpts.maxRotation : ticksOpts.minRotation);
+		var cosRotation = Math.cos(angle);
+		var sinRotation = Math.sin(angle);
+		var tickFontSize = valueOrDefault(ticksOpts.fontSize, defaults.global.defaultFontSize);
+
+		return {
+			w: (tickLabelWidth * cosRotation) + (tickFontSize * sinRotation),
+			h: (tickLabelWidth * sinRotation) + (tickFontSize * cosRotation)
+		};
+	},
+
+	/**
+	 * Crude approximation of what the label width might be
+	 * @private
+	 */
+	getLabelWidth: function(label) {
+		return this._getLabelSize(label).w;
+	},
+
+	/**
+	 * @private
+	 */
+	getLabelCapacity: function(exampleTime) {
+		var me = this;
+		var timeOpts = me.options.time;
+		var displayFormats = timeOpts.displayFormats;
+
+		// pick the longest format (milliseconds) for guestimation
+		var format = displayFormats[timeOpts.unit] || displayFormats.millisecond;
+		var exampleLabel = me.tickFormatFunction(exampleTime, 0, ticksFromTimestamps(me, [exampleTime], me._majorUnit), format);
+		var size = me._getLabelSize(exampleLabel);
+		var capacity = Math.floor(me.isHorizontal() ? me.width / size.w : me.height / size.h);
+
+		if (me.options.offset) {
+			capacity--;
+		}
+
+		return capacity > 0 ? capacity : 1;
+	}
+});
+
+// INTERNAL: static default options, registered in src/index.js
+module.exports._defaults = defaultConfig;