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48 lines
1.5 KiB
48 lines
1.5 KiB
import BezierEdgeBase from './BezierEdgeBase'
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class CubicBezierEdgeBase extends BezierEdgeBase {
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constructor(options, body, labelModule) {
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super(options, body, labelModule);
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}
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/**
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* Calculate the distance between a point (x3,y3) and a line segment from
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* (x1,y1) to (x2,y2).
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* http://stackoverflow.com/questions/849211/shortest-distancae-between-a-point-and-a-line-segment
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* https://en.wikipedia.org/wiki/B%C3%A9zier_curve
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* @param {number} x1 from x
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* @param {number} y1 from y
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* @param {number} x2 to x
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* @param {number} y2 to y
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* @param {number} x3 point to check x
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* @param {number} y3 point to check y
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* @private
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*/
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_getDistanceToBezierEdge(x1, y1, x2, y2, x3, y3, via1, via2) { // x3,y3 is the point
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let minDistance = 1e9;
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let distance;
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let i, t, x, y;
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let lastX = x1;
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let lastY = y1;
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let vec = [0,0,0,0]
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for (i = 1; i < 10; i++) {
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t = 0.1 * i;
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vec[0] = Math.pow(1 - t, 3);
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vec[1] = 3 * t * Math.pow(1 - t, 2);
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vec[2] = 3 * Math.pow(t,2) * (1 - t);
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vec[3] = Math.pow(t, 3);
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x = vec[0] * x1 + vec[1] * via1.x + vec[2] * via2.x + vec[3] * x2;
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y = vec[0] * y1 + vec[1] * via1.y + vec[2] * via2.y + vec[3] * y2;
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if (i > 0) {
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distance = this._getDistanceToLine(lastX, lastY, x, y, x3, y3);
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minDistance = distance < minDistance ? distance : minDistance;
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}
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lastX = x;
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lastY = y;
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}
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return minDistance;
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}
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}
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export default CubicBezierEdgeBase;
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