create-gojs-kit
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A CLI for downloading GoJS samples, extensions, and docs
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Sparkline Charts in Nodes | GoJS Diagramming Library
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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', {
layout: new go.GridLayout({
wrappingColumn: 2,
isOngoing: false
}),
'undoManager.isEnabled': true // enable undo & redo
});
var SPARK_STROKEWIDTH = 1;
var SPARK_INTERVAL = 3;
var BASELINE_LENGTH = 75;
function makeStringFromValues(values) {
if (values.length < 1) return 'M 0 ' + values + ' L ' + BASELINE_LENGTH + ' 0';
// if only one value, make a line BASELINE_LENGTHpx long at that value
var str = 'M 0 ' + Math.round(-values[0] * SPARK_INTERVAL);
if (values.length < 2) str += ' L ' + BASELINE_LENGTH * SPARK_INTERVAL + ' ' + Math.round(-values[0] * SPARK_INTERVAL);
for (var i = 0; i < values.length; i++) {
str += 'L ' + Math.round((i + 1) * SPARK_INTERVAL) + ' ' + Math.round(-values[i] * SPARK_INTERVAL);
}
return str;
}
// determine y offset
function makeAlignmentFromValues(values) {
var min = Infinity;
for (var i = 0; i < values.length; i++) {
min = Math.min(min, values[i]);
}
var y = -min * SPARK_INTERVAL;
if (min > 0) {
y = -SPARK_STROKEWIDTH;
} // add the strokeWidth
return new go.Spot(0, 1, 0, -y);
}
var sparkLine =
new go.Panel('Horizontal', {
alignment: go.Spot.Left,
alignmentFocusName: 'spark'
})
.bind('alignmentFocus', 'values', makeAlignmentFromValues)
.add(
new go.TextBlock({
visible: false,
margin: 1,
font: '11px sans-serif',
background: 'white'
})
.bind('alignment', 'values', values => {
var min = Infinity;
var max = -Infinity;
for (var i = 0; i < values.length; i++) {
min = Math.min(min, values[i]);
max = Math.max(max, values[i]);
}
if (max - min === 0) return go.Spot.Center;
return new go.Spot(0, 1 - Math.abs((values[0] - min) / (max - min)), 0, 0);
})
.bind('stroke', 'color')
.bind('text', 'label')
.bind('visible', 'label', l => true),
new go.Shape({
fill: null,
strokeWidth: SPARK_STROKEWIDTH,
stroke: 'gray',
name: 'spark'
})
.bind('stroke', 'color')
.bind('geometryString', 'values', makeStringFromValues)
);
myDiagram.nodeTemplate =
new go.Node('Auto')
.add(
new go.Shape({
fill: 'rgba(200,200,255,.3)',
strokeWidth: 0
}),
new go.Panel('Spot', { itemTemplate: sparkLine })
.bind('itemArray', 'items')
.add(
new go.Shape({
width: 1,
height: 200,
fill: 'red',
stroke: null,
strokeWidth: 0
})
)
);
function rand(min, max) {
return Math.random() * (max - min) + min;
}
// startValue optional
function makeRandomValues(numberOfValues, /* optional! */ startValue) {
var values = [];
var last = startValue || rand(-30, 30);
for (var i = 0; i < numberOfValues; i++) {
var newval = last + rand(-3, 3);
values.push(newval);
last = newval;
}
return values;
}
myDiagram.model = new go.GraphLinksModel({
copiesArrays: true,
copiesArrayObjects: true,
nodeDataArray: [
{
key: 'Alpha',
items: [
{ color: '#FF69B4', values: makeRandomValues(50, 20) },
{ color: '#FFB6C1', values: makeRandomValues(50) },
{ color: '#FF69B4', values: makeRandomValues(50) },
{ color: '#C71585', values: makeRandomValues(50, -20) },
{ color: 'gray', values: [0] }
]
},
{
key: 'Beta',
items: [
{ color: 'rgba(255,0,0,.6)', values: makeRandomValues(50), label: 'label A' },
{ color: 'rgba(0,0,255,.6)', values: makeRandomValues(50), label: 'long label B' },
{ color: 'darkgray', values: makeRandomValues(50), label: 'label C' },
{ color: 'lime', values: makeRandomValues(50), label: 'label D' },
{ color: 'gray', values: [0] }
]
},
{
key: 'Gamma',
items: [
{ color: 'rgba(255,0,0,.6)', values: makeRandomValues(50, -10), label: 'Important\nYear' },
{ color: 'gray', values: makeRandomValues(20, 30) },
{ color: 'gray', values: makeRandomValues(40, 30) },
{ color: 'gray', values: makeRandomValues(50, 30) },
{ color: 'gray', values: [0] }
]
}
]
});
}
window.addEventListener('DOMContentLoaded', init);
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<div id="sample">
<!-- The DIV for the Diagram needs an explicit size or else we won't see anything.
This also adds a border to help see the edges of the viewport. -->
<div id="myDiagramDiv" style="border: solid 1px black; width: 700px; height: 500px"></div>
<p>This sample shows how to create and align sparkline style charts in a Node, using Spot Panel and <code>Panel.alignmentFocusName</code>.</p>
<p>
The Spot Panel's main element is a red vertical line, and its other elements are items in an item array. Instead of aligning to these item array items,
which are Horizontal Panels, we want to align to the Shape that represents the sparkline, inside of the Panel. To do this we set
<code>Panel.alignmentFocusName</code> to <code>"spark"</code>, and then set the <code>alignmentFocus</code> in
<code>function makeAlignmentFromValues()</code> to the top left point, plus some offset to normalize the y-axis of the sparklines.
</p>
<p>
The Sparklines exist in a horizontal panel with optional labels at the front, and these sparkline labels also have their alignment computed within the
horizontal panel, based on the fractional height of the starting value of the sparkline.
</p>
</div>
</div>
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<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>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>
<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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