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32 lines
866 B
JavaScript
32 lines
866 B
JavaScript
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/**
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* @fileOverview 拓展二阶贝塞尔曲线
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* @author huangtonger@aliyun.com
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*/
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const G6 = require('@antv/g6');
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G6.registerEdge('quadraticCurve', {
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getPath(item) {
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const points = item.getPoints();
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const start = points[0];
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const source = item.getSource();
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const target = item.getTarget();
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const end = points[points.length - 1];
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const q = 0.5; // 向量方向长度系数
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const v1 = [ start.x + (end.x - start.x) * q, start.y + (end.y - start.y) * q ];
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const v2 = [ v1[0] - start.x, v1[1] - start.y ];
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const v3 = [ -v2[1], v2[0] ];
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// 控制点
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const cp = {
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x: v3[0] + v2[0] + start.x,
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y: v3[1] + v2[1] + start.y
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};
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const sp = source.getLinkPoints(cp)[0];
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const tp = target.getLinkPoints(cp)[0];
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return [
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[ 'M', sp.x, sp.y ],
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[ 'Q', cp.x, cp.y, tp.x, tp.y ]
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];
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}
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});
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