| 1 | /*
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| 2 | * Copyright (C) 1998-2021 by Northwoods Software Corporation. All Rights Reserved.
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| 3 | */
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| 4 | /*
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| 5 | * This is an extension and not part of the main GoJS library.
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| 6 | * Note that the API for this class may change with any version, even point releases.
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| 7 | * If you intend to use an extension in production, you should copy the code to your own source directory.
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| 8 | * Extensions can be found in the GoJS kit under the extensions or extensionsTS folders.
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| 9 | * See the Extensions intro page (https://gojs.net/latest/intro/extensions.html) for more information.
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| 10 | */
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| 11 | import * as go from '../release/go-module.js';
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| 12 | /**
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| 13 | * This custom {@link Link} class customizes its route to go parallel to other links connecting the same ports,
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| 14 | * if the link is not orthogonal and is not Bezier curved.
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| 15 | *
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| 16 | * If you want to experiment with this extension, try the <a href="../../extensionsJSM/ParallelRoute.html">Parallel Route Links</a> sample.
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| 17 | * @category Part Extension
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| 18 | */
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| 19 | export class ParallelRouteLink extends go.Link {
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| 20 | /**
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| 21 | * Constructs the link's route by modifying {@link #points}.
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| 22 | * @return {boolean} true if it computed a route of points
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| 23 | */
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| 24 | computePoints() {
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| 25 | const result = super.computePoints();
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| 26 | if (!this.isOrthogonal && this.curve !== go.Link.Bezier && this.hasCurviness()) {
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| 27 | const curv = this.computeCurviness();
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| 28 | if (curv !== 0) {
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| 29 | const num = this.pointsCount;
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| 30 | let pidx = 0;
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| 31 | let qidx = num - 1;
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| 32 | if (num >= 4) {
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| 33 | pidx++;
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| 34 | qidx--;
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| 35 | }
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| 36 | const frompt = this.getPoint(pidx);
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| 37 | const topt = this.getPoint(qidx);
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| 38 | const dx = topt.x - frompt.x;
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| 39 | const dy = topt.y - frompt.y;
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| 40 | let mx = frompt.x + dx * 1 / 8;
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| 41 | let my = frompt.y + dy * 1 / 8;
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| 42 | let px = mx;
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| 43 | let py = my;
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| 44 | if (-0.01 < dy && dy < 0.01) {
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| 45 | if (dx > 0)
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| 46 | py -= curv;
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| 47 | else
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| 48 | py += curv;
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| 49 | }
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| 50 | else {
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| 51 | const slope = -dx / dy;
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| 52 | let e = Math.sqrt(curv * curv / (slope * slope + 1));
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| 53 | if (curv < 0)
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| 54 | e = -e;
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| 55 | px = (dy < 0 ? -1 : 1) * e + mx;
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| 56 | py = slope * (px - mx) + my;
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| 57 | }
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| 58 | mx = frompt.x + dx * 7 / 8;
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| 59 | my = frompt.y + dy * 7 / 8;
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| 60 | let qx = mx;
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| 61 | let qy = my;
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| 62 | if (-0.01 < dy && dy < 0.01) {
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| 63 | if (dx > 0)
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| 64 | qy -= curv;
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| 65 | else
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| 66 | qy += curv;
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| 67 | }
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| 68 | else {
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| 69 | const slope = -dx / dy;
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| 70 | let e = Math.sqrt(curv * curv / (slope * slope + 1));
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| 71 | if (curv < 0)
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| 72 | e = -e;
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| 73 | qx = (dy < 0 ? -1 : 1) * e + mx;
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| 74 | qy = slope * (qx - mx) + my;
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| 75 | }
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| 76 | this.insertPointAt(pidx + 1, px, py);
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| 77 | this.insertPointAt(qidx + 1, qx, qy);
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| 78 | }
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| 79 | }
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| 80 | return result;
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| 81 | }
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| 82 | }
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