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46 lines
1.2 KiB
46 lines
1.2 KiB
/*
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* @Author: 秦少卫
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* @Date: 2023-01-07 01:15:50
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* @LastEditors: 秦少卫
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* @LastEditTime: 2023-01-07 01:16:07
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* @Description: 箭头元素
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*/
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import { fabric } from 'fabric';
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const Arrow = fabric.util.createClass(fabric.Line, {
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type: 'arrow',
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superType: 'drawing',
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initialize(points, options) {
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if (!points) {
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const { x1, x2, y1, y2 } = options;
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points = [x1, y1, x2, y2];
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}
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options = options || {};
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this.callSuper('initialize', points, options);
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},
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_render(ctx) {
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this.callSuper('_render', ctx);
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ctx.save();
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const xDiff = this.x2 - this.x1;
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const yDiff = this.y2 - this.y1;
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const angle = Math.atan2(yDiff, xDiff);
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ctx.translate((this.x2 - this.x1) / 2, (this.y2 - this.y1) / 2);
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ctx.rotate(angle);
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ctx.beginPath();
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// Move 5px in front of line to start the arrow so it does not have the square line end showing in front (0,0)
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ctx.moveTo(5, 0);
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ctx.lineTo(-5, 5);
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ctx.lineTo(-5, -5);
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ctx.closePath();
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ctx.fillStyle = this.stroke;
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ctx.fill();
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ctx.restore();
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},
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});
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Arrow.fromObject = (options, callback) => {
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const { x1, x2, y1, y2 } = options;
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return callback(new Arrow([x1, y1, x2, y2], options));
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};
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export default Arrow;
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