Ümit Tunç
54 lines
2.0 KiB
JavaScript
54 lines
2.0 KiB
JavaScript
(function(exports) {
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function TriangleControlHandleFactory(Annotations, WVMathNamespace) {
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class TriangleControlHandle extends Annotations.ControlHandle {
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constructor(annotation, index) {
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super();
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this.annotation = annotation;
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// set the index of this control handle so that we know which vertex it corresponds to
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this.index = index;
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}
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// returns a rect that should represent the control handle's position and size
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getDimensions(annotation, selectionBox, zoom) {
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let x = annotation.vertices[this.index].x;
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let y = annotation.vertices[this.index].y;
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// account for zoom level
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const width = Annotations.ControlHandle.handleWidth / zoom;
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const height = Annotations.ControlHandle.handleHeight / zoom;
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// adjust for the control handle's own width and height
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x -= width * 0.5;
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y -= height * 0.5;
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return new WVMathNamespace.Rect(x, y, x + width, y + height);
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}
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// this function is called when the control handle is dragged
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move(annotation, deltaX, deltaY) {
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annotation.vertices[this.index].x += deltaX;
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annotation.vertices[this.index].y += deltaY;
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// recalculate the X, Y, width and height of the annotation
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let minX = Number.MAX_VALUE;
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let maxX = -Number.MAX_VALUE;
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let minY = Number.MAX_VALUE;
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let maxY = -Number.MAX_VALUE;
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for (let i = 0; i < annotation.vertices.length; ++i) {
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const vertex = annotation.vertices[i];
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minX = Math.min(minX, vertex.x);
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maxX = Math.max(maxX, vertex.x);
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minY = Math.min(minY, vertex.y);
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maxY = Math.max(maxY, vertex.y);
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}
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const rect = new Annotations.Rect(minX, minY, maxX, maxY);
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annotation.setRect(rect);
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// return true if redraw is needed
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return true;
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}
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}
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return TriangleControlHandle;
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}
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exports.TriangleControlHandleFactory = {
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initialize: TriangleControlHandleFactory,
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};
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})(window);
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