gojs
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Interactive diagrams, charts, and graphs, such as trees, flowcharts, orgcharts, UML, BPMN, or business diagrams
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JavaScript
/*
* Copyright (C) 1998-2020 by Northwoods Software Corporation. All Rights Reserved.
*/
/*
* This is an extension and not part of the main GoJS library.
* Note that the API for this class may change with any version, even point releases.
* If you intend to use an extension in production, you should copy the code to your own source directory.
* Extensions can be found in the GoJS kit under the extensions or extensionsTS folders.
* See the Extensions intro page (https://gojs.net/latest/intro/extensions.html) for more information.
*/
import * as go from '../release/go-module.js';
/**
* This custom {@link Link} class customizes its route to go parallel to other links connecting the same ports,
* if the link is not orthogonal and is not Bezier curved.
*
* If you want to experiment with this extension, try the <a href="../../extensionsTS/ParallelRoute.html">Parallel Route Links</a> sample.
* @category Part Extension
*/
export class ParallelRouteLink extends go.Link {
/**
* Constructs the link's route by modifying {@link #points}.
* @return {boolean} true if it computed a route of points
*/
computePoints() {
const result = super.computePoints();
if (!this.isOrthogonal && this.curve !== go.Link.Bezier && this.hasCurviness()) {
const curv = this.computeCurviness();
if (curv !== 0) {
const num = this.pointsCount;
let pidx = 0;
let qidx = num - 1;
if (num >= 4) {
pidx++;
qidx--;
}
const frompt = this.getPoint(pidx);
const topt = this.getPoint(qidx);
const dx = topt.x - frompt.x;
const dy = topt.y - frompt.y;
let mx = frompt.x + dx * 1 / 8;
let my = frompt.y + dy * 1 / 8;
let px = mx;
let py = my;
if (-0.01 < dy && dy < 0.01) {
if (dx > 0)
py -= curv;
else
py += curv;
}
else {
const slope = -dx / dy;
let e = Math.sqrt(curv * curv / (slope * slope + 1));
if (curv < 0)
e = -e;
px = (dy < 0 ? -1 : 1) * e + mx;
py = slope * (px - mx) + my;
}
mx = frompt.x + dx * 7 / 8;
my = frompt.y + dy * 7 / 8;
let qx = mx;
let qy = my;
if (-0.01 < dy && dy < 0.01) {
if (dx > 0)
qy -= curv;
else
qy += curv;
}
else {
const slope = -dx / dy;
let e = Math.sqrt(curv * curv / (slope * slope + 1));
if (curv < 0)
e = -e;
qx = (dy < 0 ? -1 : 1) * e + mx;
qy = slope * (qx - mx) + my;
}
this.insertPointAt(pidx + 1, px, py);
this.insertPointAt(qidx + 1, qx, qy);
}
}
return result;
}
}