create-gojs-kit
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A CLI for downloading GoJS samples, extensions, and docs
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<meta name="description" content="Arrange nodes into concentric circles using CircularLayout." />
<meta itemprop="description" content="Arrange nodes into concentric circles using CircularLayout." />
<meta property="og:description" content="Arrange nodes into concentric circles using CircularLayout." />
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<title>
Multiple Concentric Circles of Nodes Laid out by Circular Layout | GoJS Diagramming Library
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<body>
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<script>
window.addEventListener("DOMContentLoaded", function () {
// topnav
var topButton = document.getElementById("topnavButton");
var topnavList = document.getElementById("topnavList");
if (topButton && topnavList) {
topButton.addEventListener("click", function (e) {
topnavList
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e.stopPropagation();
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document.addEventListener("click", function (e) {
// if the clicked element isn't the list, close the list
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// set active <a> element
var url = window
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<div class="flex flex-col prose">
<div class="w-full max-w-screen-xl mx-auto">
<!-- * * * * * * * * * * * * * -->
<!-- Start of GoJS sample code -->
<script src="https://cdn.jsdelivr.net/npm/gojs@3.1.0"></script>
<div id="allSampleContent" class="p-4 w-full">
<script id="code">
function init() {
myDiagram = new go.Diagram('myDiagramDiv', {
initialAutoScale: go.AutoScale.Uniform,
'animationManager.isEnabled': false
});
myDiagram.nodeTemplate =
new go.Node('Auto', { locationSpot: go.Spot.Center })
.bind('width')
.bind('height', 'width')
.add(
new go.Shape('Circle', { fill: 'gray', stroke: '#D8D8D8' })
.bind('fill', 'color'),
// define the node's text
new go.TextBlock({ margin: 5, font: 'bold 12pt sans-serif' })
.bind('text', 'key')
);
// create the model for the double circle
const data = [];
// if you want a node in the center, set its layer: 0
//data.push({ layer: 0, width: 50 });
for (let i = 0; i < 10; i++) data.push({ layer: 1, color: 'tomato', width: 50 + Math.random() * 50 });
for (let i = 0; i < 20; i++) data.push({ layer: 2, color: 'orange', width: 50 + Math.random() * 50 });
for (let i = 0; i < 15; i++) data.push({ layer: 3, color: 'gold', width: 50 + Math.random() * 50 });
//for (let i = 0; i < 10; i++) data.push({ layer: 4, color: "lightgreen", width: 50 + Math.random()*50 });
//for (let i = 0; i < 5; i++) data.push({ layer: 5, color: "lightblue", width: 50 + Math.random()*50 });
myDiagram.model = new go.GraphLinksModel(data);
doubleCircleLayout(myDiagram);
}
function doubleCircleLayout(diagram) {
diagram.startTransaction('Multi Circle Layout');
let radius = NaN;
let layer = 1;
let nodes = null;
while (((nodes = nodesByLayer(diagram, layer)), nodes.count > 0)) {
const layout = new go.CircularLayout();
layout.nodeDiameterFormula = go.CircularLayout.Circular;
layout.radius = radius;
layout.doLayout(nodes);
// recenter at (0, 0)
const cntr = layout.actualCenter;
diagram.moveParts(nodes, new go.Point(-cntr.x, -cntr.y));
// next layout uses a larger radius
let t = 0; // compute how thick the layer needs to be
nodes.each(n => (t = Math.max(t, n.actualBounds.width)));
radius = Math.max(isNaN(radius) ? 0 : radius, layout.actualXRadius) + 10 + t;
layer++;
}
nodesByLayer(diagram, 0).each(n => { n.location = new go.Point(0, 0) });
diagram.commitTransaction('Multi Circle Layout');
}
function nodesByLayer(diagram, layer) {
return new go.Set(diagram.nodes.filter(n => n.data.layer === layer));
}
window.addEventListener('DOMContentLoaded', init);
</script>
<div id="sample">
<div id="myDiagramDiv" style="background-color: white; border: solid 1px black; width: 100%; height: 500px"></div>
<p>
This sample displays a diagram of two or more sets of nodes intended to be arranged in concentric circles. Note how because there are so many nodes in layer
#2, with the orange nodes, its radius has to be larger than the radius of the inner layer #1 in order to avoid overlapping nodes. And the outer layer #3,
with the gold nodes, there is greater space between the nodes because there are fewer nodes and the radius is larger.
</p>
<p>
Unlike many <b>GoJS</b> apps, there is no <a>Diagram.layout</a> assigned. Layouts are performed explicitly in code -- a separate <a>CircularLayout</a> for
each subset of nodes. Each layout's radius is determined by the <a>CircularLayout.actualXRadius</a> of the previous layout, except the first one which uses
a radius of <code>NaN</code>, letting the nodes in layer #1 determine the natural radius that is required to avoid node overlaps.
</p>
</div>
</div>
<!-- * * * * * * * * * * * * * -->
<!-- End of GoJS sample code -->
</div>
<div id="allTagDescriptions" class="p-4 w-full max-w-screen-xl mx-auto">
<hr/>
<h3 class="text-xl">GoJS Features in this sample</h3>
<!-- blacklist tags that do not correspond to a specific GoJS feature -->
<h4>Collections</h4>
<p>
<b>GoJS</b> provides its own collection classes: <a href="../api/symbols/List.html" target="api">List</a>, <a href="../api/symbols/Set.html" target="api">Set</a>, and <a href="../api/symbols/Map.html" target="api">Map</a>.
You can iterate over a collection by using an <a href="../api/symbols/Iterator.html" target="api">Iterator</a>.
More information can be found in the <a href="../intro/collections.html">GoJS Intro</a>.
</p>
<p>
<a href="../samples/index.html#collections">Related samples</a>
</p>
<hr>
<!-- blacklist tags that do not correspond to a specific GoJS feature -->
<h4>Circular Layout</h4>
<p>
This predefined layout is used for placing Nodes in a cirular or elliptical arrangement.
More information can be found in the <a href="../intro/layouts.html#CircularLayout">GoJS Intro</a>.
</p>
<p>
<a href="../samples/index.html#circularlayout">Related samples</a>
</p>
<hr>
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</div>
</div>
</body>
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<script src="../assets/js/goSamples.js"></script>
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