gojs
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Interactive diagrams, charts, and graphs, such as trees, flowcharts, orgcharts, UML, BPMN, or business diagrams
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<meta name="description" content="TypeScript: A demonstration of the SectorReshapingTool extension."/>
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<!-- Copyright 1998-2023 by Northwoods Software Corporation. -->
<title>Tool for Reshaping a Sector of a Circle</title>
</head>
<body>
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<h1 class="my-0 p-1 ">GoJS</h1>
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<!-- * * * * * * * * * * * * * -->
<!-- Start of GoJS sample code -->
<div id="allSampleContent" class="p-4 w-full">
<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="SectorReshapingTool.js" target="_blank">SectorReshapingTool.js</a>.
</p>
</div>
<script type="module" id="code">
import * as go from "../release/go-module.js";
import { SectorReshapingTool } from './SectorReshapingTool.js';
if (window.goSamples) goSamples(); // init for the samples -- you don't need to call this
const $ = go.GraphObject.make;
const 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) {
const radius = SectorReshapingTool.getRadius(data);
const angle = SectorReshapingTool.getAngle(data);
const sweep = SectorReshapingTool.getSweep(data);
const start = new go.Point(radius, 0).rotate(angle);
// this is much more efficient than calling go.GraphObject.make:
const geo = new go.Geometry()
.add(new go.PathFigure(radius + start.x, radius + start.y) // start point
.add(new go.PathSegment(go.PathSegment.Arc, angle, sweep, // angles
radius, radius, // center
radius, radius)) // radius
.add(new go.PathSegment(go.PathSegment.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 =
$(go.Node, 'Spot',
{
locationSpot: go.Spot.Center, locationObjectName: 'LAMP',
selectionObjectName: 'LAMP', selectionAdorned: false
},
new go.Binding('location', 'loc', go.Point.parse).makeTwoWay(go.Point.stringify),
// selecting a Node brings it forward in the z-order
new go.Binding('layerName', 'isSelected', (s) => s ? 'Foreground' : '').ofObject(),
$(go.Panel, 'Spot', { name: 'LAMP' },
$(go.Shape, // arc
{ fill: 'yellow', stroke: 'lightgray', strokeWidth: 0.5 },
new go.Binding('geometry', '', makeSector)),
$(go.Shape, 'Circle', { name: 'SHAPE', width: 6, height: 6 })),
$(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)'
},
new go.Binding('alignment', 'spot', go.Spot.parse).makeTwoWay(go.Spot.stringify),
new go.Binding('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.myDiagram = myDiagram; // Attach to the window for console debugging
</script>
</div>
<!-- * * * * * * * * * * * * * -->
<!-- End of GoJS sample code -->
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