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90 lines
3.4 KiB
90 lines
3.4 KiB
/*
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* Copyright (C) 1998-2019 by Northwoods Software Corporation. All Rights Reserved.
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*/
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import * as go from '../release/go';
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/**
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* This CurvedLinkReshapingTool class allows for a {@link Link}'s path to be modified by the user
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* via the dragging of a single tool handle at the middle of the link.
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* Dragging the handle changes the value of {@link Link#curviness}.
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*
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* If you want to experiment with this extension, try the <a href="../../extensionsTS/CurvedLinkReshaping.html">Curved Link Reshaping</a> sample.
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* @category Tool Extension
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*/
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export class CurvedLinkReshapingTool extends go.LinkReshapingTool {
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private _originalCurviness: number = NaN;
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/**
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* @hidden @internal
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*/
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public makeAdornment(pathshape: go.GraphObject): go.Adornment {
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const link = pathshape.part as go.Link;
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if (link !== null && link.curve === go.Link.Bezier && link.pointsCount === 4) {
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const adornment = new go.Adornment();
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adornment.type = go.Panel.Link;
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const h = this.makeHandle(pathshape, 0);
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this.setReshapingBehavior(h, go.LinkReshapingTool.All);
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h.cursor = 'move';
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adornment.add(h);
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adornment.category = this.name;
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adornment.adornedObject = pathshape;
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return adornment;
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} else {
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return super.makeAdornment(pathshape);
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}
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}
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/**
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* Start reshaping, if {@link #findToolHandleAt} finds a reshape handle at the mouse down point.
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*
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* If successful this sets {@link #handle} to be the reshape handle that it finds
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* and {@link #adornedLink} to be the {@link Link} being routed.
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* It also remembers the original link route (a list of Points) and curviness in case this tool is cancelled.
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* And it starts a transaction.
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*/
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public doActivate(): void {
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super.doActivate();
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if (this.adornedLink !== null) this._originalCurviness = this.adornedLink.curviness;
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}
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/**
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* Restore the link route to be the original points and curviness and stop this tool.
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*/
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public doCancel(): void {
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if (this.adornedLink !== null) this.adornedLink.curviness = this._originalCurviness;
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super.doCancel();
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}
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/**
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* Change the route of the {@link #adornedLink} by moving the point corresponding to the current
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* {@link #handle} to be at the given {@link Point}.
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* This is called by {@link #doMouseMove} and {@link #doMouseUp} with the result of calling
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* {@link #computeReshape} to constrain the input point.
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* @param {Point} newpt the value of the call to {@link #computeReshape}.
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*/
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public reshape(newpt: go.Point): void {
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const link = this.adornedLink;
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if (link !== null && link.curve === go.Link.Bezier && link.pointsCount === 4) {
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const start = link.getPoint(0);
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const end = link.getPoint(3);
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const ang = start.directionPoint(end);
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const mid = new go.Point((start.x + end.x) / 2, (start.y + end.y) / 2);
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const a = new go.Point(9999, 0).rotate(ang + 90).add(mid);
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const b = new go.Point(9999, 0).rotate(ang - 90).add(mid);
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const q = newpt.copy().projectOntoLineSegmentPoint(a, b);
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let curviness = Math.sqrt(mid.distanceSquaredPoint(q));
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const port = link.fromPort;
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if (port === link.toPort && port !== null) {
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if (newpt.y < port.getDocumentPoint(go.Spot.Center).y) curviness = -curviness;
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} else {
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const diff = mid.directionPoint(q) - ang;
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if ((diff > 0 && diff < 180) || (diff < -180)) curviness = -curviness;
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}
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link.curviness = curviness;
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} else {
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super.reshape(newpt);
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}
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}
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}
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