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71 lines
1.8 KiB
71 lines
1.8 KiB
/**
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* Created by Alex on 3/20/2015.
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*/
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import EdgeBase from './util/EdgeBase'
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class StraightEdge extends EdgeBase {
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constructor(options, body, labelModule) {
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super(options, body, labelModule);
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}
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cleanup() {
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return false;
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}
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/**
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* Draw a line between two nodes
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* @param {CanvasRenderingContext2D} ctx
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* @private
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*/
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_line(ctx) {
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// draw a straight line
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ctx.beginPath();
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ctx.moveTo(this.from.x, this.from.y);
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ctx.lineTo(this.to.x, this.to.y);
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ctx.stroke();
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return undefined;
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}
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/**
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* Combined function of pointOnLine and pointOnBezier. This gives the coordinates of a point on the line at a certain percentage of the way
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* @param percentage
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* @param via
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* @returns {{x: number, y: number}}
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* @private
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*/
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getPoint(percentage) {
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return {
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x: (1 - percentage) * this.from.x + percentage * this.to.x,
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y: (1 - percentage) * this.from.y + percentage * this.to.y
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}
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}
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_findBorderPosition(nearNode, ctx) {
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let node1 = this.to;
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let node2 = this.from;
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if (nearNode.id === this.from.id) {
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node1 = this.from;
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node2 = this.to;
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}
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let angle = Math.atan2((node1.y - node2.y), (node1.x - node2.x));
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let dx = (node1.x - node2.x);
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let dy = (node1.y - node2.y);
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let edgeSegmentLength = Math.sqrt(dx * dx + dy * dy);
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let toBorderDist = nearNode.distanceToBorder(ctx, angle);
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let toBorderPoint = (edgeSegmentLength - toBorderDist) / edgeSegmentLength;
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let borderPos = {};
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borderPos.x = (1 - toBorderPoint) * node2.x + toBorderPoint * node1.x;
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borderPos.y = (1 - toBorderPoint) * node2.y + toBorderPoint * node1.y;
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return borderPos;
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}
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_getDistanceToEdge(x1, y1, x2, y2, x3, y3) { // x3,y3 is the point
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return this._getDistanceToLine(x1, y1, x2, y2, x3, y3);
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}
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}
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export default StraightEdge;
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