create-gojs-kit
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A CLI for downloading GoJS samples, extensions, and docs
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Friend Wheel Diagram for Elliptical Arrangement of Nodes and Curved Links Inside Ellipse | GoJS Diagramming Library
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<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">
class WheelLayout extends go.CircularLayout {
constructor(init) {
super();
if (init) Object.assign(this, init);
}
// override makeNetwork to set the diameter of each node and ignore the TextBlock label
makeNetwork(coll) {
const net = super.makeNetwork(coll);
net.vertexes.each(v => v.diameter = 25); // pretend nodes are 25x25 in size
return net;
}
// override commitNodes to rotate nodes so the text goes away from the center,
// and flip text if it would be upside-down
commitNodes() {
super.commitNodes();
const num = this.network.vertexes.count;
if (num < 2) return;
this.network.vertexes.each(v => {
const node = v.node;
if (node === null) return;
// get the angle of the node towards the center, and rotate it accordingly
const a = v.actualAngle;
// make sure the text isn't upside down
const textBlock = node.findObject('TEXTBLOCK');
if (textBlock !== null) {
textBlock.angle = (a > 90 && a < 270) ? 180 : 0;
}
node.angle = a;
});
}
// override commitLinks in order to make sure all of the Bezier links are "inside" the ellipse;
// this helps avoid links crossing over any other nodes
commitLinks() {
super.commitLinks();
this.network.edges.each(e => {
const link = e.link;
if (link === null) return;
let da = e.toVertex.actualAngle;
let sa = e.fromVertex.actualAngle;
if (da - sa > 180) da -= 360;
else if (sa - da > 180) sa -= 360;
let c = sa - da;
if (c < 0) c = Math.max(-60, Math.min(c, -30));
else c = Math.max(30, Math.min(c, 60));
link.curviness = c;
});
}
}
// end WheelLayout class
const highlightColor = 'red'; // color parameterization
function init() {
myDiagram = new go.Diagram('myDiagramDiv', {
'animationManager.isEnabled': false,
initialAutoScale: go.AutoScale.Uniform,
padding: 10,
contentAlignment: go.Spot.Center,
layout: new WheelLayout({ // set up a custom CircularLayout
// set some properties appropriate for this sample
arrangement: go.CircularArrangement.ConstantDistance,
nodeDiameterFormula: go.CircularNodeDiameterFormula.Circular,
spacing: 10,
aspectRatio: 0.7,
sorting: go.CircularSorting.Optimized
}),
isReadOnly: true,
click: e => {
// background click clears any remaining highlighteds
e.diagram.commit(d => d.clearHighlighteds());
}
});
// define the Node template
myDiagram.nodeTemplate =
new go.Node('Horizontal', {
selectionAdorned: false,
locationSpot: go.Spot.Center, // Node.location is the center of the Shape
locationObjectName: 'SHAPE',
mouseEnter: (e, node) => {
e.diagram.clearHighlighteds();
node.linksConnected.each(l => highlightLink(l, true));
node.isHighlighted = true;
const tb = node.findObject('TEXTBLOCK');
if (tb !== null) tb.stroke = highlightColor;
},
mouseLeave: (e, node) => {
e.diagram.clearHighlighteds();
const tb = node.findObject('TEXTBLOCK');
if (tb !== null) tb.stroke = 'black';
}
})
.bind('text', 'text') // for sorting the nodes
.add(
new go.Shape('Circle', {
name: 'SHAPE',
fill: 'lightgray', // default value, but also data-bound
stroke: 'transparent', // modified by highlighting
strokeWidth: 2,
desiredSize: new go.Size(25, 25),
portId: ''
}) // so links will go to the shape, not the whole node
.bind('fill', 'color')
.bindObject('stroke', 'isHighlighted', h => h ? highlightColor : 'transparent'),
new go.TextBlock({ name: 'TEXTBLOCK' }) // for search
.bind('text', 'text')
);
function highlightLink(link, show) {
link.isHighlighted = show;
link.fromNode.isHighlighted = show;
link.toNode.isHighlighted = show;
}
// define the Link template
myDiagram.linkTemplate =
new go.Link({
// routing: go.Routing.Orthogonal,
curve: go.Curve.Bezier,
selectionAdorned: false,
mouseEnter: (e, link) => highlightLink(link, true),
mouseLeave: (e, link) => highlightLink(link, false)
})
.add(
new go.Shape()
.bindObject('stroke', 'isHighlighted', (h, shape) => h ? highlightColor : go.Brush.darken(shape.part.data.color))
.bindObject('strokeWidth', 'isHighlighted', h => h ? 3 : 1.5)
// no arrowhead -- assume directionality of relationship need not be shown
);
generateGraph();
}
function generateGraph() {
const names = [
'Joshua',
'Daniel',
'Robert',
'Noah',
'Anthony',
'Elizabeth',
'Addison',
'Alexis',
'Ella',
'Samantha',
'Joseph',
'Scott',
'James',
'Ryan',
'Benjamin',
'Walter',
'Gabriel',
'Christian',
'Nathan',
'Simon',
'Isabella',
'Emma',
'Olivia',
'Sophia',
'Ava',
'Emily',
'Madison',
'Tina',
'Elena',
'Mia',
'Jacob',
'Ethan',
'Michael',
'Alexander',
'William',
'Natalie',
'Grace',
'Lily',
'Alyssa',
'Ashley',
'Sarah',
'Taylor',
'Hannah',
'Brianna',
'Hailey',
'Christopher',
'Aiden',
'Matthew',
'David',
'Andrew',
'Kaylee',
'Juliana',
'Leah',
'Anna',
'Allison',
'John',
'Samuel',
'Tyler',
'Dylan',
'Jonathan'
];
const colors = ['#67001f', '#b2182b', '#d6604d', '#f4a582', '#fddbc7', '#f7f7f7', '#d1e5f0', '#92c5de', '#4393c3', '#2166ac', '#053061'];
const nodeDataArray = [];
for (let i = 0; i < names.length; i++) {
nodeDataArray.push({ key: i, text: names[i], color: colors[i % colors.length] });
}
const linkDataArray = [];
const num = nodeDataArray.length;
for (let i = 0; i < num * 2; i++) {
const a = Math.floor(Math.random() * num);
const b = Math.floor((Math.random() * num) / 4) + 1;
linkDataArray.push({ from: a, to: (a + b) % num, color: colors[i % colors.length] });
}
myDiagram.model = new go.GraphLinksModel(nodeDataArray, linkDataArray);
}
window.addEventListener('DOMContentLoaded', init);
</script>
<div id="sample">
<div id="myDiagramDiv" style="border: solid 1px black; background: white; width: 100%; height: 600px"></div>
<p>
This "friend wheel" demonstrates the use of <a>CircularLayout</a>. The layout has been customized to make sure each node is considered to have a fixed
diameter, ignoring the size of any <a>TextBlock</a>.
</p>
<p>
The custom layout also rotates each <a>Node</a> according to the actual angle at which the node was positioned. This information is available on the
<a>CircularVertex</a> used by the <a>LayoutNetwork</a> that the <a>CircularLayout</a> constructs from the nodes and links of the diagram. Furthermore, when
laying out the nodes it also flips the angle of the <a>TextBlock</a> so that the text is not upside-down.
</p>
<p>
<a>GraphObject.mouseEnter</a> and <a>GraphObject.mouseLeave</a> event handlers on the <a>Node</a> template highlight both the Node and all of the Links that
connect with the Node. The same event handlers on the <a>Link</a>s highlight that Link and both connected Nodes. Changes made in these event handlers
automatically are not recorded in the <a>UndoManager</a>, although this sample does not enable the UndoManager anyway.
</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>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>
<!-- blacklist tags that do not correspond to a specific GoJS feature -->
<h4>Custom Layouts</h4>
<p>
GoJS allows for the creation of custom layouts to meet specific needs.
</p>
<p>
There are also many layouts that are extensions -- not predefined in the <code>go.js</code> or <code>go-debug.js</code> library,
but available as source code in one of the three extension directories, with some documentation and corresponding samples.
More information can be found in the <a href="../intro/layouts.html#CustomLayouts">GoJS Intro</a>.
</p>
<p>
<a href="../samples/index.html#customlayout">Related samples</a>
</p>
<hr>
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</body>
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