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feat: 新增细尾箭头绘制元素(thinTailArrow) (#382)
* feat: 新增细尾箭头绘制元素(thinTailArrow) * fix: 细尾箭头样式调整
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,57 @@ | ||
| /* | ||
| * @Author: wuchenguang1998 | ||
| * @Date: 2024-05-10 10:46:10 | ||
| * @LastEditors: wuchenguang1998 | ||
| * @LastEditTime: 2024-05-10 22:08:51 | ||
| * @Description: 细尾箭头，支持控制条拖拽不变形 | ||
| */ | ||
| import { fabric } from 'fabric'; | ||
|
|
||
| fabric.ThinTailArrow = fabric.util.createClass(fabric.Line, { | ||
| type: 'thinTailArrow', | ||
| superType: 'drawing', | ||
| initialize(points, options) { | ||
| if (!points) { | ||
| const { x1, x2, y1, y2 } = options; | ||
| points = [x1, y1, x2, y2]; | ||
| } | ||
| options = options || {}; | ||
| this.callSuper('initialize', points, options); | ||
| }, | ||
| _render(ctx) { | ||
| ctx.save(); | ||
| // 乘或除对应的scaleX(Y)，抵消元素放缩造成的影响，使箭头不会变形 | ||
| ctx.scale(1 / this.scaleX, 1 / this.scaleY); | ||
| const xDiff = (this.x2 - this.x1) * this.scaleX; | ||
| const yDiff = (this.y2 - this.y1) * this.scaleY; | ||
| ctx.translate(-xDiff / 2, -yDiff / 2); | ||
| // 箭头方位角 | ||
| const angle = Math.atan2(yDiff, xDiff); | ||
| ctx.rotate(angle); | ||
| // 箭头总长(最小长度是20) | ||
| let length = Math.hypot(xDiff, yDiff); | ||
| length = length < 20 ? 20 : length; | ||
| // 绘制箭头 | ||
| ctx.beginPath(); | ||
| ctx.moveTo(0, 0); | ||
| ctx.lineTo(length - 18, -5); | ||
| ctx.lineTo(length - 20, -12); | ||
| ctx.lineTo(length, 0); | ||
| ctx.lineTo(length - 20, 12); | ||
| ctx.lineTo(length - 18, 5); | ||
| ctx.lineTo(0, 0); | ||
| ctx.lineWidth = this.strokeWidth; | ||
| ctx.strokeStyle = this.stroke; | ||
| ctx.fillStyle = this.fill; | ||
| ctx.stroke(); | ||
| ctx.fill(); | ||
| ctx.restore(); | ||
| }, | ||
| }); | ||
|
|
||
| fabric.ThinTailArrow.fromObject = (options, callback) => { | ||
| const { x1, x2, y1, y2 } = options; | ||
| return callback(new fabric.ThinTailArrow([x1, y1, x2, y2], options)); | ||
| }; | ||
|
|
||
| export default fabric.ThinTailArrow; |
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