92 lines
3.5 KiB
JavaScript
92 lines
3.5 KiB
JavaScript
"use strict";
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/*
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* Copyright (C) 1998-2017 by Northwoods Software Corporation. All Rights Reserved.
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*/
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// A custom Link that draws a "balloon" shape around the Link.fromNode
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/**
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* @constructor
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* @extends Link
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* @class
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* This custom Link class customizes its Shape to surround the comment node.
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* If the Shape is filled, it will obscure the comment itself unless the Link is behind the comment node.
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* Thus the default layer for BalloonLinks is "Background".
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*/
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function BalloonLink() {
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go.Link.call(this);
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this.layerName = "Background";
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this.base = 10;
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}
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go.Diagram.inherit(BalloonLink, go.Link);
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/*
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* The width of the base of the triangle at the center point of the Link.fromNode.
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* The default value is 10.
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* @name BalloonLink#base
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* @function.
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* @return {number}
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*/
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Object.defineProperty(BalloonLink.prototype, "base", {
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get: function() { return this._base; },
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set: function(value) { this._base = value; }
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});
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/**
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* Produce a Geometry from the Link's route that draws a "balloon" shape around the Link.fromNode
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* and has a triangular shape with the base at the fromNode and the top at the toNode.
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* @override
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* @this {BalloonLink}
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*/
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BalloonLink.prototype.makeGeometry = function() {
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// assume the fromNode is the comment and the toNode is the commented-upon node
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var bb = this.fromNode.actualBounds;
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var nb = this.toNode.actualBounds;
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var numpts = this.pointsCount;
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var p0 = bb.center;
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var pn = this.getPoint(numpts - 1);
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if (bb.intersectsRect(nb)) {
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pn = nb.center;
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}
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var pos = this.routeBounds;
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// compute the intersection points for the triangular arrow
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var ang = pn.directionPoint(p0);
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var L = new go.Point(this.base, 0).rotate(ang - 90).add(p0);
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var R = new go.Point(this.base, 0).rotate(ang + 90).add(p0);
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this.getLinkPointFromPoint(this.fromNode, this.fromNode, L, pn, true, L);
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this.getLinkPointFromPoint(this.fromNode, this.fromNode, R, pn, true, R);
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// form a triangular arrow from the comment to the commented node
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var fig = new go.PathFigure(pn.x - pos.x, pn.y - pos.y, true); // filled; start at arrow point at commented node
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fig.add(new go.PathSegment(go.PathSegment.Line, R.x - pos.x, R.y - pos.y)); // a triangle base point on comment's edge
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var side = 0;
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if (L.y >= bb.bottom || R.y >= bb.bottom) side = 2;
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else if (L.x <= bb.x && R.x <= bb.x) side = 1;
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else if (L.x >= bb.right && R.x >= bb.right) side = 3;
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this.pathToCorner(side, bb, fig, pos, L, R);
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this.pathToCorner(side + 1, bb, fig, pos, L, R);
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this.pathToCorner(side + 2, bb, fig, pos, L, R);
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this.pathToCorner(side + 3, bb, fig, pos, L, R);
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fig.add(new go.PathSegment(go.PathSegment.Line, L.x - pos.x, L.y - pos.y).close()); // the other triangle base point on comment's edge
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// return a Geometry
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return new go.Geometry().add(fig);
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};
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/**
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* @ignore
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* Draw a line to a corner, but not if the comment arrow encompasses that corner.
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* @this {BalloonLink}
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*/
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BalloonLink.prototype.pathToCorner = function(side, bb, fig, pos, L, R) {
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switch (side % 4) {
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case 0: if (!(L.y <= bb.y && R.x <= bb.x)) fig.add(new go.PathSegment(go.PathSegment.Line, bb.x - pos.x, bb.y - pos.y)); break;
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case 1: if (!(L.x <= bb.x && R.y >= bb.bottom)) fig.add(new go.PathSegment(go.PathSegment.Line, bb.x - pos.x, bb.bottom - pos.y)); break;
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case 2: if (!(L.y >= bb.bottom && R.x >= bb.right)) fig.add(new go.PathSegment(go.PathSegment.Line, bb.right - pos.x, bb.bottom - pos.y)); break;
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case 3: if (!(L.x >= bb.right && R.y <= bb.y)) fig.add(new go.PathSegment(go.PathSegment.Line, bb.right - pos.x, bb.y - pos.y)); break;
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}
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};
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// end BalloonLink class
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