| 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 CurvedLinkReshapingTool class allows for a {@link Link}'s path to be modified by the user
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| 14 | * via the dragging of a single tool handle at the middle of the link.
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| 15 | * Dragging the handle changes the value of {@link Link#curviness}.
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| 16 | *
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| 17 | * If you want to experiment with this extension, try the <a href="../../extensionsJSM/CurvedLinkReshaping.html">Curved Link Reshaping</a> sample.
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| 18 | * @category Tool Extension
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| 19 | */
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| 20 | export class CurvedLinkReshapingTool extends go.LinkReshapingTool {
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| 21 | constructor() {
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| 22 | super(...arguments);
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| 23 | this._originalCurviness = NaN;
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| 24 | }
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| 25 | /**
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| 26 | * @hidden @internal
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| 27 | */
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| 28 | makeAdornment(pathshape) {
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| 29 | const link = pathshape.part;
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| 30 | if (link !== null && link.curve === go.Link.Bezier && link.pointsCount === 4) {
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| 31 | const adornment = new go.Adornment();
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| 32 | adornment.type = go.Panel.Link;
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| 33 | const h = this.makeHandle(pathshape, 0);
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| 34 | this.setReshapingBehavior(h, go.LinkReshapingTool.All);
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| 35 | h.cursor = 'move';
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| 36 | adornment.add(h);
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| 37 | adornment.category = this.name;
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| 38 | adornment.adornedObject = pathshape;
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| 39 | return adornment;
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| 40 | }
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| 41 | else {
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| 42 | return super.makeAdornment(pathshape);
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| 43 | }
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| 44 | }
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| 45 | /**
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| 46 | * Start reshaping, if {@link #findToolHandleAt} finds a reshape handle at the mouse down point.
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| 47 | *
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| 48 | * If successful this sets {@link #handle} to be the reshape handle that it finds
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| 49 | * and {@link #adornedLink} to be the {@link Link} being routed.
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| 50 | * It also remembers the original link route (a list of Points) and curviness in case this tool is cancelled.
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| 51 | * And it starts a transaction.
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| 52 | */
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| 53 | doActivate() {
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| 54 | super.doActivate();
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| 55 | if (this.adornedLink !== null)
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| 56 | this._originalCurviness = this.adornedLink.curviness;
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| 57 | }
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| 58 | /**
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| 59 | * Restore the link route to be the original points and curviness and stop this tool.
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| 60 | */
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| 61 | doCancel() {
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| 62 | if (this.adornedLink !== null)
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| 63 | this.adornedLink.curviness = this._originalCurviness;
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| 64 | super.doCancel();
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| 65 | }
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| 66 | /**
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| 67 | * Change the route of the {@link #adornedLink} by moving the point corresponding to the current
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| 68 | * {@link #handle} to be at the given {@link Point}.
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| 69 | * This is called by {@link #doMouseMove} and {@link #doMouseUp} with the result of calling
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| 70 | * {@link #computeReshape} to constrain the input point.
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| 71 | * @param {Point} newpt the value of the call to {@link #computeReshape}.
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| 72 | */
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| 73 | reshape(newpt) {
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| 74 | const link = this.adornedLink;
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| 75 | if (link !== null && link.curve === go.Link.Bezier && link.pointsCount === 4) {
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| 76 | const start = link.getPoint(0);
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| 77 | const end = link.getPoint(3);
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| 78 | const ang = start.directionPoint(end);
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| 79 | const mid = new go.Point((start.x + end.x) / 2, (start.y + end.y) / 2);
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| 80 | const a = new go.Point(9999, 0).rotate(ang + 90).add(mid);
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| 81 | const b = new go.Point(9999, 0).rotate(ang - 90).add(mid);
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| 82 | const q = newpt.copy().projectOntoLineSegmentPoint(a, b);
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| 83 | let curviness = Math.sqrt(mid.distanceSquaredPoint(q));
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| 84 | const port = link.fromPort;
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| 85 | if (port === link.toPort && port !== null) {
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| 86 | if (newpt.y < port.getDocumentPoint(go.Spot.Center).y)
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| 87 | curviness = -curviness;
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| 88 | }
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| 89 | else {
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| 90 | const diff = mid.directionPoint(q) - ang;
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| 91 | if ((diff > 0 && diff < 180) || (diff < -180))
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| 92 | curviness = -curviness;
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| 93 | }
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| 94 | link.curviness = curviness;
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| 95 | }
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| 96 | else {
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| 97 | super.reshape(newpt);
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| 98 | }
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| 99 | }
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| 100 | }
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