gojs
Version:
Interactive diagrams, charts, and graphs, such as trees, flowcharts, orgcharts, UML, BPMN, or business diagrams
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HTML
<html>
<head>
<meta charset="UTF-8">
<title>Tool for Reshaping a Sector of a Circle</title>
<meta name="description" content="A demonstration of the SectorReshapingTool extension." />
<meta name="viewport" content="width=device-width, initial-scale=1">
<!-- Copyright 1998-2020 by Northwoods Software Corporation. -->
<script src="../release/go.js"></script>
<script src="../assets/js/goSamples.js"></script> <!-- this is only for the GoJS Samples framework -->
<script src="SectorReshapingTool.js"></script>
<script id="code">
function init() {
if (window.goSamples) goSamples(); // init for these samples -- you don't need to call this
var $ = go.GraphObject.make;
myDiagram =
$(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 calling go.GraphObject.make:
var 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", function(s) { return 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
}
</script>
</head>
<body onload="init()">
<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>
</div>
</body>
</html>