create-gojs-kit
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A CLI for downloading GoJS samples, extensions, and docs
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Double Tree of Nodes and Links Laid out by TreeLayout in Two Opposite Directions from Root Node | GoJS Diagramming Library
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<div class="flex flex-col prose">
<div class="w-full max-w-screen-xl mx-auto">
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<!-- 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 src="../extensions/DoubleTreeLayout.js"></script>
<script id="code">
function init() {
myDiagram = new go.Diagram('myDiagramDiv', {
layout: new DoubleTreeLayout({
//vertical: true, // default directions are horizontal
// choose whether this subtree is growing towards the right or towards the left:
directionFunction: n => n.data && n.data.dir !== 'left'
// controlling the parameters of each TreeLayout:
//bottomRightOptions: { nodeSpacing: 0, layerSpacing: 20 },
//topLeftOptions: { alignment: go.TreeAlignment.Start },
})
});
// define all of the gradient brushes
const graygrad = new go.Brush('Linear', { 0: '#F5F5F5', 1: '#F1F1F1' });
const bluegrad = new go.Brush('Linear', { 0: '#CDDAF0', 1: '#91ADDD' });
const yellowgrad = new go.Brush('Linear', { 0: '#FEC901', 1: '#FEA200' });
const lavgrad = new go.Brush('Linear', { 0: '#EF9EFA', 1: '#A570AD' });
myDiagram.nodeTemplate =
new go.Node('Auto', { isShadowed: true })
.add(
// define the node's outer shape
new go.Shape('RoundedRectangle', {
fill: graygrad, // default fill is gray
stroke: '#D8D8D8'
})
.bind('fill', 'color'),
// define the node's text
new go.TextBlock({
margin: 5,
font: 'bold 11px Helvetica, bold Arial, sans-serif'
})
.bind('text', 'key')
);
myDiagram.linkTemplate =
new go.Link({ selectable: false, corner: 10 }) // the whole link panel
.add(
new go.Shape() // the link shape
);
// create the model for the double tree; could be eiher TreeModel or GraphLinksModel
myDiagram.model = new go.TreeModel([
{ key: 'Root', color: lavgrad },
{ key: 'Left1', parent: 'Root', dir: 'left', color: bluegrad },
{ key: 'leaf1', parent: 'Left1' },
{ key: 'leaf2', parent: 'Left1' },
{ key: 'Left2', parent: 'Left1', color: bluegrad },
{ key: 'leaf3', parent: 'Left2' },
{ key: 'leaf4', parent: 'Left2' },
{ key: 'leaf5', parent: 'Left1' },
{ key: 'Right1', parent: 'Root', dir: 'right', color: yellowgrad },
{ key: 'Right2', parent: 'Right1', color: yellowgrad },
{ key: 'leaf11', parent: 'Right2' },
{ key: 'leaf12', parent: 'Right2' },
{ key: 'leaf13', parent: 'Right2' },
{ key: 'leaf14', parent: 'Right1' },
{ key: 'leaf15', parent: 'Right1' },
{ key: 'Right3', parent: 'Root', dir: 'right', color: yellowgrad },
{ key: 'leaf16', parent: 'Right3' },
{ key: 'leaf17', parent: 'Right3' }
]);
}
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 bow-tie diagram of two trees sharing a single root node growing in opposite directions. The immediate child data of the ROOT node
have a "dir" property that describes the direction that subtree should grow.
</p>
<p>
The <a>Diagram.layout</a> is an instance of the <a>DoubleTreeLayout</a> extension layout, defined in
<a href="../extensions/DoubleTreeLayout.js">extensions/DoubleTreeLayout.js</a>. The layout requires a <a>DoubleTreeLayout.directionFunction</a> predicate to
decide for a child node of the root node which way the subtree should grow.
</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>Tree Layout</h4>
<p>
This predefined layout is used for placing Nodes of a tree-structured graph in layers (rows or columns).
For discussion and examples of the most commonly used properties of the <a href="../api/symbols/TreeLayout.html">TreeLayout</a>,
see the <a href="../intro/trees.html">Trees</a> page in the Introduction.
More information can be found in the <a href="../intro/layouts.html#TreeLayout">GoJS Intro</a>.
</p>
<p>
<a href="../samples/index.html#treelayout">Related samples</a>
</p>
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