create-gojs-kit
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A CLI for downloading GoJS samples, extensions, and docs
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Pie Charts in Nodes | GoJS Diagramming Library
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<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', {
nodeTemplate:
new go.Node('Vertical')
.add(
new go.Panel({
itemTemplate:
new go.Panel({
toolTip:
go.GraphObject.build('ToolTip')
.add(
new go.TextBlock({ margin: 4 })
.bind('text', '', data => data.color + ': ' + data.start + ' to ' + (data.start + data.sweep))
)
})
.add(
new go.Shape({ fill: 'lightgreen', isGeometryPositioned: true })
.bind('fill', 'color')
.bind('geometry', '', makeGeo)
)
})
.bind('itemArray', 'slices'),
new go.TextBlock()
.bind('text')
),
model: new go.GraphLinksModel({
copiesArrays: true,
copiesArrayObjects: true,
nodeDataArray: [
// node data
{
key: 1,
text: 'full circle',
slices: [
{ start: -30, sweep: 60, color: 'white' },
{ start: 30, sweep: 300, color: 'red' }
]
},
{
key: 2,
text: 'partial circle',
slices: [
{ start: 0, sweep: 120, color: 'lightgreen' },
{ start: 120, sweep: 70, color: 'blue' },
{ start: 250, sweep: 20, color: 'yellow' }
]
}
],
linkDataArray: [
// link data
{ from: 1, to: 2 }
]
})
});
function makeGeo(data) {
return new go.Geometry()
.add(
new go.PathFigure(50, 50) // start point
.add(
new go.PathSegment(
go.SegmentType.Arc,
data.start,
data.sweep, // angles
50,
50, // center
50,
50
) // radius
.close()
)
);
}
}
window.addEventListener('DOMContentLoaded', init);
</script>
<div id="sample">
<div id="myDiagramDiv" style="border: solid 1px black; width: 100%; height: 500px"></div>
<p>
Each node has a Position Panel whose <a>Panel.itemArray</a> is data bound to the "slices" property of the node data. That "slices" property is an Array of
data objects; for each item the <a>Panel.itemTemplate</a> produces a Shape whose <a>Shape.geometry</a> is computed using a conversion function to generate a
pie-shaped slice given a start angle and a sweep angle from the item data. Note that <a>Shape.isGeometryPositioned</a> is true to make sure all of the
Shapes are positioned by their computed geometries, independent of any stroke width. Each slice Panel also has a tooltip showing some information.
</p>
<p>For more sophisticated charts within nodes, see the <a href="canvases.html">Canvas Charts</a> sample.</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>Item Arrays</h4>
<p>
It is sometimes useful to display a variable number of elements in a node by data binding to a JavaScript Array.
In GoJS, this is simply achieved by binding (or setting) <a href="../api/symbols/Panel.html#itemArray" target="api">Panel.itemArray</a>.
The <a href="../api/symbols/Panel.html" target="api">Panel</a> will create an element in the panel for each value in the Array.
More information can be found in the <a href="../intro/itemArrays.html">GoJS Intro</a>.
</p>
<p>
<a href="../samples/index.html#itemarrays">Related samples</a>
</p>
<hr>
<!-- blacklist tags that do not correspond to a specific GoJS feature -->
<h4>ToolTips</h4>
<p>
A tooltip is an <a href="../api/symbols/Adornment.html" target="api">Adornment</a> that is shown when the mouse hovers over an object that has its <a href="../api/symbols/GraphObject.html#toolTip" target="api">GraphObject.toolTip</a> set.
The tooltip part is bound to the same data as the part itself.
</p>
<p>
It is typical to implement a tooltip as a "ToolTip" Panel holding a <a href="../api/symbols/TextBlock.html" target="api">TextBlock</a> or a Panel of TextBlocks and other objects.
Each "ToolTip" is just an "Auto" Panel <a href="../api/symbols/Adornment.html" target="api">Adornment</a> that is shadowed, and where the border is a rectangular <a href="../api/symbols/Shape.html" target="api">Shape</a> with a light gray fill.
However you can implement the tooltip as any arbitrarily complicated Adornment.
</p>
<p>
More information can be found in the <a href="../intro/tooltips.html">GoJS Intro</a>.
</p>
<p>
<a href="../samples/index.html#tooltips">Related samples</a>
</p>
<hr>
<!-- blacklist tags that do not correspond to a specific GoJS feature -->
<h4>Geometry Path Strings</h4>
<p>
The <b>GoJS</b> <a href="../api/symbols/Geometry.html" target="api">Geometry</a> class controls the "shape" of a <a href="../api/symbols/Shape.html" target="api">Shape</a>,
whereas the <a href="../api/symbols/Shape.html#fill" target="api">Shape.fill</a> and <a href="../api/symbols/Shape.html#stroke" target="api">Shape.stroke</a> and other shape properties control the colors and appearance of the shape.
For common shape figures, there are predefined geometries that can be used by setting <a href="../api/symbols/Shape.html#figure" target="api">Shape.figure</a>.
However one can also define custom geometries.
</p>
<p>
One can construct any Geometry by allocating and initializing a <a href="../api/symbols/Geometry.html" target="api">Geometry</a> of at least one <a href="../api/symbols/PathFigure.html" target="api">PathFigure</a> holding some <a href="../api/symbols/PathSegment.html" target="api">PathSegment</a>s.
But you may find that using the string representation of a Geometry is easier to write and save in a database.
Use the static method <a href="../api/symbols/Geometry.html#parse" target="api">Geometry.parse</a> or the <a href="../api/symbols/Shape.html#geometryString" target="api">Shape.geometryString</a> property to transform a geometry path string into a <a href="../api/symbols/Geometry.html" target="api">Geometry</a> object.
</p>
<p>
More information can be found in the <a href="../intro/geometry.html">GoJS Intro</a>.
</p>
<p>
<a href="../samples/index.html#geometries">Related samples</a>
</p>
<hr>
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