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153 lines
5.6 KiB
153 lines
5.6 KiB
<!DOCTYPE html>
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<html>
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<head>
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<meta charset="UTF-8">
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<title>Tapered Links</title>
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<meta name="description" content="A Link class using a custom tapered geometry by overriding Link.makeGeometry." />
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<meta name="viewport" content="width=device-width, initial-scale=1">
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<!-- Copyright 1998-2019 by Northwoods Software Corporation. -->
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<script src="../release/go.js"></script>
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<script src="../assets/js/goSamples.js"></script> <!-- this is only for the GoJS Samples framework -->
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<script id="code">
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function init() {
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if (window.goSamples) goSamples(); // init for these samples -- you don't need to call this
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var $ = go.GraphObject.make;
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myDiagram =
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$(go.Diagram, "myDiagramDiv", // the ID of the DIV HTML element
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{
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layout: $(go.ForceDirectedLayout),
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"undoManager.isEnabled": true
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});
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// This controls whether links overlap each other at each side of the node,
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// or if the links are spread out on each side of the node.
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var SPREADLINKS = true; // must be set before defining templates!
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myDiagram.nodeTemplate =
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$(go.Node, go.Panel.Auto,
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{ locationSpot: go.Spot.Center },
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$(go.Shape,
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{
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figure: "RoundedRectangle",
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parameter1: 10,
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fill: "orange", // default fill color
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portId: "",
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fromLinkable: true,
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fromSpot: (SPREADLINKS ? go.Spot.AllSides : go.Spot.None),
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toLinkable: true,
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toSpot: (SPREADLINKS ? go.Spot.AllSides : go.Spot.None),
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cursor: "pointer"
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},
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new go.Binding("fill", "color")),
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$(go.TextBlock,
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{ margin: 10, font: "bold 12pt sans-serif" },
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new go.Binding("text"))
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);
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myDiagram.linkTemplate =
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$(TaperedLink, // subclass of Link, defined below
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go.Link.Bezier,
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(SPREADLINKS ? go.Link.None : go.Link.Orthogonal),
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{
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fromEndSegmentLength: (SPREADLINKS ? 50 : 1),
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toEndSegmentLength: (SPREADLINKS ? 50 : 1),
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relinkableFrom: true,
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relinkableTo: true
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},
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$(go.Shape,
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{ stroke: null, strokeWidth: 0 },
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new go.Binding("fill", "color"))
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);
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// create a few nodes and links
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myDiagram.model = new go.GraphLinksModel([
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{ key: 1, text: "one", color: "lightyellow" },
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{ key: 2, text: "two", color: "brown" },
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{ key: 3, text: "three", color: "green" },
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{ key: 4, text: "four", color: "slateblue" },
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{ key: 5, text: "five", color: "aquamarine" },
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{ key: 6, text: "six", color: "lightgreen" },
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{ key: 7, text: "seven" }
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], [
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{ from: 5, to: 6, color: "orange" },
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{ from: 1, to: 2, color: "red" },
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{ from: 1, to: 3, color: "blue" },
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{ from: 1, to: 4, color: "goldenrod" },
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{ from: 2, to: 5, color: "fuchsia" },
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{ from: 3, to: 5, color: "green" },
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{ from: 4, to: 5, color: "black" },
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{ from: 6, to: 7 }
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]);
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}
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function TaperedLink() {
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go.Link.call(this);
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}
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go.Diagram.inherit(TaperedLink, go.Link);
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// produce a Geometry from the Link's route
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TaperedLink.prototype.makeGeometry = function() {
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// maybe use the standard geometry for this route, instead?
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var numpts = this.pointsCount;
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if (numpts < 4 || this.computeCurve() !== go.Link.Bezier) {
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return go.Link.prototype.makeGeometry.call(this);
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}
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var p0 = this.getPoint(0);
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var p1 = this.getPoint((numpts > 4) ? 2 : 1);
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var p2 = this.getPoint((numpts > 4) ? numpts - 3 : 2);
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var p3 = this.getPoint(numpts - 1);
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var fromHoriz = Math.abs(p0.y - p1.y) < Math.abs(p0.x - p1.x);
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var toHoriz = Math.abs(p2.y - p3.y) < Math.abs(p2.x - p3.x);
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var p0x = p0.x + (fromHoriz ? 0 : -4);
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var p0y = p0.y + (fromHoriz ? -4 : 0);
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var p1x = p1.x + (fromHoriz ? 0 : -3);
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var p1y = p1.y + (fromHoriz ? -3 : 0);
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var p2x = p2.x + (toHoriz ? 0 : -2);
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var p2y = p2.y + (toHoriz ? -2 : 0);
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var p3x = p3.x + (toHoriz ? 0 : -1);
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var p3y = p3.y + (toHoriz ? -1 : 0);
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var fig = new go.PathFigure(p0x, p0y, true); // filled
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fig.add(new go.PathSegment(go.PathSegment.Bezier, p3x, p3y, p1x, p1y, p2x, p2y));
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p0x = p0.x + (fromHoriz ? 0 : 4);
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p0y = p0.y + (fromHoriz ? 4 : 0);
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p1x = p1.x + (fromHoriz ? 0 : 3);
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p1y = p1.y + (fromHoriz ? 3 : 0);
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p2x = p2.x + (toHoriz ? 0 : 2);
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p2y = p2.y + (toHoriz ? 2 : 0);
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p3x = p3.x + (toHoriz ? 0 : 1);
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p3y = p3.y + (toHoriz ? 1 : 0);
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fig.add(new go.PathSegment(go.PathSegment.Line, p3x, p3y));
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fig.add(new go.PathSegment(go.PathSegment.Bezier, p0x, p0y, p2x, p2y, p1x, p1y).close());
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var geo = new go.Geometry();
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geo.add(fig);
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geo.normalize();
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return geo;
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};
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// end TaperedLink class
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</script>
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</head>
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<body onload="init()">
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<div id="sample">
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<div id="myDiagramDiv" style="border: solid 1px black; width:100%; height:700px; min-width: 200px"></div>
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<p>
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This sample demonstrates customization of the <a>Link</a> <a>Shape</a>'s <a>Geometry</a>.
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</p>
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<p>
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The TaperedLink class in this sample inherits from Link and overrides the makeGeometry method.
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For Bezier-curve Links, this computes a Geometry that is thick at the "from" end and thin at the "to" end.
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The implementation is very simple and does not account for links that
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are coming out from a node at angles that are not a multiple of 90 degrees.
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</p>
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</div>
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</body>
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</html>
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