create-gojs-kit
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A CLI for downloading GoJS samples, extensions, and docs
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Reshaping and Rotating Sectors of Circles | GoJS Diagramming Library
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<script src="https://cdn.jsdelivr.net/npm/gojs@3.1.0"></script>
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<script src="../extensions/SectorReshapingTool.js"></script>
<script id="code">
function init() {
myDiagram = new go.Diagram('myDiagramDiv', {
'animationManager.isEnabled': false,
'undoManager.isEnabled': true
});
// install the SectorReshapingTool as a mouse-down tool
myDiagram.toolManager.mouseDownTools.add(new SectorReshapingTool());
function makeSector(data) {
// Geometry converter for the node's "LAMP" Shape
var radius = SectorReshapingTool.getRadius(data);
var angle = SectorReshapingTool.getAngle(data);
var sweep = SectorReshapingTool.getSweep(data);
var start = new go.Point(radius, 0).rotate(angle);
// this is much more efficient than using make:
var geo = new go.Geometry()
.add(
new go.PathFigure(radius + start.x, radius + start.y) // start point
.add(new go.PathSegment(go.SegmentType.Arc, angle, sweep, radius, radius, radius, radius))
.add(new go.PathSegment(go.SegmentType.Line, radius, radius).close())
)
.add(new go.PathFigure(0, 0)) // make sure the Geometry always includes the whole circle
.add(new go.PathFigure(2 * radius, 2 * radius)); // even if only a small sector is "lit"
return geo;
}
myDiagram.nodeTemplate =
new go.Node('Spot', {
locationSpot: go.Spot.Center,
locationObjectName: 'LAMP',
selectionObjectName: 'LAMP',
selectionAdorned: false
})
.bindTwoWay('location', 'loc', go.Point.parse, go.Point.stringify)
// selecting a Node brings it forward in the z-order
.bindObject('layerName', 'isSelected', s => s ? 'Foreground' : '')
.add(
new go.Panel('Spot', { name: 'LAMP' })
.add(
new go.Shape({ fill: 'yellow', stroke: 'lightgray', strokeWidth: 0.5 }) // arc
.bind('geometry', '', makeSector),
new go.Shape('Circle', { name: 'SHAPE', width: 6, height: 6 })
),
new go.TextBlock({
alignment: new go.Spot(0.5, 0.5, 0, 3),
alignmentFocus: go.Spot.Top,
stroke: 'blue',
background: 'rgba(255,255,255,0.3)'
})
.bindTwoWay('alignment', 'spot', go.Spot.parse, go.Spot.stringify)
.bind('text', 'name')
);
myDiagram.model = new go.GraphLinksModel([
{ name: 'Alpha', radius: 70, sweep: 120 },
{ name: 'Beta', radius: 70, sweep: 80, angle: 200 }
]);
myDiagram.commandHandler.selectAll(); // to show the tool handles
}
window.addEventListener('DOMContentLoaded', init);
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<div id="sample">
<div id="myDiagramDiv" style="border: solid 1px black; width: 100%; height: 600px"></div>
<p>Two of the handles permit changing the angles of the sector; one handle permits changing the radius of the sector.</p>
<p>
Note that the <a>Geometry</a> returned by <code>makeSector</code> always returns a Geometry that occupies the area that would be occupied by a full circle.
That Geometry-creating function also depends on three data properties, <code>radius</code>, <code>angle</code>, and <code>sweep</code>.
</p>
<p>This extension tool is defined in its own file, as <a href="../extensions/SectorReshapingTool.js">SectorReshapingTool.js</a>.</p>
</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>Tools</h4>
<p>
<a href="../api/symbols/Tool.html" target="api">Tool</a>s handle all input events, such as mouse and keyboard interactions, in a Diagram.
There are many kinds of predefined Tool classes that implement all of the common operations that users do.
</p>
<p>
For flexibility and simplicity, all input events are canonicalized as <a href="../api/symbols/InputEvent.html" target="api">InputEvent</a>s and
redirected by the diagram to go to the <a href="../api/symbols/Diagram.html#currentTool" target="api">Diagram.currentTool</a>.
By default the Diagram.currentTool is an instance of <a href="../api/symbols/ToolManager.html" target="api">ToolManager</a> held as the <a href="../api/symbols/Diagram.html#toolManager" target="api">Diagram.toolManager</a>.
The ToolManager implements support for all mode-less tools.
The ToolManager is responsible for finding another tool that is ready to run and then making it the new current tool.
This causes the new tool to process all of the input events (mouse, keyboard, and touch) until the tool decides that it is finished,
at which time the diagram's current tool reverts back to the <a href="../api/symbols/Diagram.html#defaultTool" target="api">Diagram.defaultTool</a>, which is normally the ToolManager, again.
</p>
<p>
More information can be found in the <a href="../intro/tools.html">GoJS Intro</a>.
</p>
<p>
<a href="../samples/index.html#tools">Related samples</a>
</p>
<hr>
<!-- blacklist tags that do not correspond to a specific GoJS feature -->
<h4>GoJS Extensions</h4>
<p>
<b>GoJS</b> can be extended in a variety of ways.
The most common way to change the standard behavior is to set properties on the <a href="../api/symbols/GraphObject.html" target="api">GraphObject</a>, <a href="../api/symbols/Diagram.html" target="api">Diagram</a>, <a href="../api/symbols/CommandHandler.html" target="api">CommandHandler</a>, <a href="../api/symbols/Tool.html" target="api">Tool</a>, or <a href="../api/symbols/Layout.html" target="api">Layout</a>.
But when the desired property does not exist, you might need to override methods of CommandHandler, Tool, Layout, Link, or Node.
Methods that you can override are documented in the API reference.
Various features of GoJS can be overriden, either by replacing a method on an instance (a feature of JavaScript) or by defining a subclass.
You should not modify the prototypes of any of the <b>GoJS</b> classes.
</p>
<p>
In addition to our samples, <b>GoJS</b> provides an <strong><a href="../samples/#extensions">extensions gallery</a></strong>,
showcasing the creation of custom tools and layouts.
Those classes and samples are written in TypeScript, available at <code>../extensionsJSM/</code>,
as ECMAScript/JavaScript modules -- these use the <code>../release/go-module.js</code> library.
We recommend that you copy the files that you need into your project, so that you can adjust how they refer to the GoJS library
that you choose and so that you can include them into your own building and packaging procedures.
</p>
<p>
More information can be found in the <a href="../intro/extensions.html">GoJS Intro</a>.
</p>
<p>
<a href="../samples/index.html#extensions">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>
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