gojs
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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>Draggable Link Labels That Stay On Path</title>
<meta name="description" content="TypeScript: This variation on the LinkLabelDraggingTool extension restricts link labels to stay on the link's route while the user is dragging it." />
<meta name="viewport" content="width=device-width, initial-scale=1">
<!-- Copyright 1998-2019 by Northwoods Software Corporation. -->
<script src="../samples/assets/require.js"></script>
<script src="../assets/js/goSamples.js"></script>
<!-- this is only for the GoJS Samples framework -->
<script id="code">
function init() {
require(["LinkLabelOnPathDraggingScript"], function(app) {
app.init();
});
}
</script>
</head>
<body onload="init()">
<div id="sample">
<div id="myDiagramDiv" style="background-color: whitesmoke; border: solid 1px black; width: 100%; height: 600px"></div>
<p>
This sample demonstrates a custom Tool, LinkLabelOnPathDraggingTool, that allows the user to drag the label of a Link, but
that keeps the label exactly on the path of the link. The tool is defined at <a href="LinkLabelOnPathDraggingTool.ts">LinkLabelOnPathDraggingTool.ts</a>.
</p>
<p>
The label on the link can be any arbitrarily complex object. It is positioned by the <a>GraphObject.segmentIndex</a> and <a>GraphObject.segmentFraction</a> properties, which are set by the LinkLabelOnPathDraggingTool. TwoWay Bindings
on those two properties automatically remember any modified values on the link data object in the model.
</p>
<p>
The tool is derived from a similar tool, <a href="LinkLabelDraggingTool.ts">LinkLabelDraggingTool.ts</a>, that allows
the user to drag the label in any direction from the mid-point of the Link path.
</p>
</div>
</body>
</html>