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