147 lines
5.0 KiB
HTML
147 lines
5.0 KiB
HTML
<!DOCTYPE html>
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<html>
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<head>
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<meta name="viewport" content="width=device-width, initial-scale=1">
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<title>Multi-Arrow Links</title>
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<meta name="description" content="A custom Link geometry that draws arrowheads at the end of each segment of orthogonally routed links." />
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<!-- Copyright 1998-2017 by Northwoods Software Corporation. -->
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<meta charset="UTF-8">
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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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initialContentAlignment: go.Spot.Center,
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layout: $(go.ForceDirectedLayout),
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"undoManager.isEnabled": true
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});
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myDiagram.nodeTemplate =
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$(go.Node, go.Panel.Auto,
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{ locationSpot: go.Spot.Center },
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$(go.Shape,
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{
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figure: "RoundedRectangle",
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parameter1: 10,
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fill: "orange", // default fill color
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portId: "",
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fromLinkable: true,
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fromSpot: go.Spot.AllSides,
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toLinkable: true,
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toSpot: go.Spot.AllSides,
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cursor: "pointer"
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},
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new go.Binding("fill", "color")),
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$(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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$(MultiArrowLink, // subclass of Link, defined below
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{
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relinkableFrom: true,
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relinkableTo: true,
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reshapable: true,
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resegmentable: true
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},
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$(go.Shape,
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{ isPanelMain: true },
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new go.Binding("fill", "color"))
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// no arrowhead is defined here -- they are hard-coded in MultiArrowLink.makeGeometry
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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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// Produce a Geometry that includes an arrowhead at the end of each segment.
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// This only works with orthogonal non-Bezier routing.
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function MultiArrowLink() {
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go.Link.call(this);
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this.routing = go.Link.Orthogonal;
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}
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go.Diagram.inherit(MultiArrowLink, go.Link);
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// produce a Geometry from the Link's route
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MultiArrowLink.prototype.makeGeometry = function () {
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// get the Geometry created by the standard behavior
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var geo = go.Link.prototype.makeGeometry.call(this);
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if (geo.type !== go.Geometry.Path || geo.figures.length === 0) return geo;
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var mainfig = geo.figures.elt(0); // assume there's just one PathFigure
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var mainsegs = mainfig.segments;
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var arrowLen = 8; // length for each arrowhead
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var arrowWid = 3; // actually half-width of each arrowhead
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var fx = mainfig.startX;
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var fy = mainfig.startY;
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for (var i = 0; i < mainsegs.length; i++) {
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var a = mainsegs.elt(i);
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// assume each arrowhead is a simple triangle
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var ax = a.endX;
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var ay = a.endY;
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var bx = ax;
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var by = ay;
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var cx = ax;
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var cy = ay;
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if (fx < ax - arrowLen) {
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bx -= arrowLen; by += arrowWid;
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cx -= arrowLen; cy -= arrowWid;
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} else if (fx > ax + arrowLen) {
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bx += arrowLen; by += arrowWid;
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cx += arrowLen; cy -= arrowWid;
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} else if (fy < ay - arrowLen) {
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bx -= arrowWid; by -= arrowLen;
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cx += arrowWid; cy -= arrowLen;
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} else if (fy > ay + arrowLen) {
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bx -= arrowWid; by += arrowLen;
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cx += arrowWid; cy += arrowLen;
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}
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geo.add(new go.PathFigure(ax, ay, true)
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.add(new go.PathSegment(go.PathSegment.Line, bx, by))
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.add(new go.PathSegment(go.PathSegment.Line, cx, cy).close()));
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fx = ax;
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fy = ay;
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}
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return geo;
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};
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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 MultiArrowLink class in this sample inherits from Link and overrides the <a>Link.makeGeometry</a> method
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to add arrowheads at the end of each interior segment, assuming that the route is orthogonal.
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</p>
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</div>
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</body>
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</html>
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