94 lines
3.3 KiB
HTML
94 lines
3.3 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>Double Circle</title>
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<meta name="description" content="Arrange nodes into concentric circles." />
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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; // for conciseness in defining templates in this function
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myDiagram =
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$(go.Diagram, "myDiagramDiv", // must be the ID or reference to div
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{
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initialContentAlignment: go.Spot.Center,
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initialAutoScale: go.Diagram.Uniform,
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"animationManager.isEnabled": false
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});
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myDiagram.nodeTemplate =
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$(go.Node, "Auto",
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{ locationSpot: go.Spot.Center },
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$(go.Shape, "Circle",
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{ fill: "gray", stroke: "#D8D8D8" },
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new go.Binding("fill", "color")),
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// define the node's text
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$(go.TextBlock,
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{ margin: 5, font: "bold 11px Helvetica, bold Arial, sans-serif" },
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new go.Binding("text", "key"))
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);
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// create the model for the double circle
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var data = [];
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// if you want a node in the center, set its layer: 0
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//data.push({ layer: 0, color: "red" });
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for (var i = 0; i < 10; i++) data.push({ layer: 1, color: go.Brush.randomColor() });
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for (var i = 0; i < 25; i++) data.push({ layer: 2, color: go.Brush.randomColor() });
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myDiagram.model = new go.GraphLinksModel(data);
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doubleCircleLayout(myDiagram);
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}
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function doubleCircleLayout(diagram) {
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var $ = go.GraphObject.make; // for conciseness in defining templates
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diagram.startTransaction("Multi Circle Layout");
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var radius = 100;
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var layer = 1;
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var nodes = null;
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while (nodes = nodesByLayer(diagram, layer), nodes.count > 0) {
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var layout = $(go.CircularLayout,
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{ radius: radius });
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layout.doLayout(nodes);
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// recenter at (0, 0)
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var cntr = layout.actualCenter;
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diagram.moveParts(nodes, new go.Point(-cntr.x, -cntr.y));
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// next layout uses a larger radius
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radius += 100;
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layer++;
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}
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nodesByLayer(diagram, 0).each(function(n) { n.location = new go.Point(0, 0); });
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diagram.commitTransaction("Multi Circle Layout");
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}
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function nodesByLayer(diagram, layer) {
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var set = new go.Set(go.Node);
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diagram.nodes.each(function(part) {
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if (part instanceof go.Node && part.data.layer === layer) set.add(part);
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});
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return set;
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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="background-color: white; border: solid 1px black; width: 100%; height: 500px"></div>
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<p>
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This sample displays a diagram of two sets of nodes intended to be arranged in different circles.
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</p>
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<p>
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Unlike many <b>GoJS</b> apps, there is no <a>Diagram.layout</a> assigned.
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Layouts are performed explicitly in code -- a separate <a>CircularLayout</a> for each subset of nodes.
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The code will actually work with a variable number of layers/circles, not just two.
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</p>
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</div>
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</body>
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</html>
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