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 lang="en">
<head>
<meta charset="utf-8"/>
<meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no, viewport-fit=cover"/>
<meta name="description" content="Customize the pinch-zooming action of GoJS."/>
<link rel="stylesheet" href="../assets/css/style.css"/>
<!-- Copyright 1998-2023 by Northwoods Software Corporation. -->
<title>Zoom Pinch GoJS Sample</title>
</head>
<body>
<!-- This top nav is not part of the sample code -->
<nav id="navTop" class="w-full z-30 top-0 text-white bg-nwoods-primary">
<div class="w-full container max-w-screen-lg mx-auto flex flex-wrap sm:flex-nowrap items-center justify-between mt-0 py-2">
<div class="md:pl-4">
<a class="text-white hover:text-white no-underline hover:no-underline
font-bold text-2xl lg:text-4xl rounded-lg hover:bg-nwoods-secondary " href="../">
<h1 class="my-0 p-1 ">GoJS</h1>
</a>
</div>
<button id="topnavButton" class="rounded-lg sm:hidden focus:outline-none focus:ring" aria-label="Navigation">
<svg fill="currentColor" viewBox="0 0 20 20" class="w-6 h-6">
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</svg>
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<div id="topnavList" class="hidden sm:block items-center w-auto mt-0 text-white p-0 z-20">
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<hr class="border-b border-gray-600 opacity-50 my-0 py-0" />
</nav>
<div class="md:flex flex-col md:flex-row md:min-h-screen w-full max-w-screen-xl mx-auto">
<div id="navSide" class="flex flex-col w-full md:w-48 text-gray-700 bg-white flex-shrink-0"></div>
<!-- * * * * * * * * * * * * * -->
<!-- Start of GoJS sample code -->
<script src="../release/go.js"></script>
<div id="allSampleContent" class="p-4 w-full">
<script id="code">
// Override normal pinch zoom to zoom the selected node instead of the Diagram.
class PinchResizingTool extends go.ToolManager {
constructor() {
super();
this._originalScale = 1;
this._startDistance = 0; // how far apart the touches are at the start
this._isPinching = false;
}
// Initiates pinch-zooming on multi-touch devices.
standardPinchZoomStart() {
const diagram = this.diagram;
if (diagram === null) return;
const e = diagram.lastInput;
const first = e.getMultiTouchViewPoint(0, new go.Point());
const second = e.getMultiTouchViewPoint(1, new go.Point());
if (!first.isReal() || !second.isReal()) {
return;
}
// event.isMultiTouch
// call doCancel to stop the rest of typical toolManager.domousedown/domousemove behavior
this.doCancel();
const node = diagram.selection.first();
if (node === null) return;
this._originalScale = node.scale;
this._startDistance = Math.sqrt(first.distanceSquaredPoint(second));
e.bubbles = false;
e.handled = true;
this._isPinching = true;
myDiagram.startTransaction('zoom node');
}
// Continues pinch-zooming (started by {@link #standardPinchZoomStart} on multi-touch devices.
standardPinchZoomMove() {
const diagram = this.diagram;
if (diagram === null) return;
const e = diagram.lastInput;
const first = e.getMultiTouchViewPoint(0, new go.Point());
const second = e.getMultiTouchViewPoint(1, new go.Point());
if (!first.isReal() || !second.isReal()) {
return;
}
// event.isMultiTouch
// call doCancel to stop the rest of typical toolManager.domousedown/domousemove behavior
this.doCancel();
var dist = Math.sqrt(first.distanceSquaredPoint(second));
var scale = dist / this._startDistance;
var node = diagram.selection.first();
if (node instanceof go.Node) node.scale = this._originalScale * scale;
e.bubbles = false;
e.handled = true;
}
doMouseUp() {
if (this._isPinching) {
myDiagram.commitTransaction('zoom node');
this._isPinching = false;
}
super.doMouseUp();
}
}
// end of PinchResizingTool
function init() {
// Since 2.2 you can also author concise templates with method chaining instead of GraphObject.make
// For details, see https://gojs.net/latest/intro/buildingObjects.html
const $ = go.GraphObject.make; // for conciseness in defining templates
myDiagram = new go.Diagram("myDiagramDiv", // create a Diagram for the DIV HTML element
{
toolManager: new PinchResizingTool(),
"undoManager.isEnabled": true // enable undo & redo
});
// define a simple Node template
myDiagram.nodeTemplate =
$(go.Node, "Auto", // the Shape will go around the TextBlock
$(go.Shape, "RoundedRectangle", { strokeWidth: 0 },
// Shape.fill is bound to Node.data.color
new go.Binding("fill", "color")),
$(go.TextBlock,
{ margin: 8 }, // some room around the text
// TextBlock.text is bound to Node.data.key
new go.Binding("text", "key"))
);
myDiagram.model = new go.GraphLinksModel(
[
{ key: "Alpha", color: "lightblue" },
{ key: "Beta", color: "orange" },
{ key: "Gamma", color: "lightgreen" },
{ key: "Delta", color: "pink" }
],
[
{ from: "Alpha", to: "Beta" },
{ from: "Alpha", to: "Gamma" },
{ from: "Beta", to: "Beta" },
{ from: "Gamma", to: "Delta" },
{ from: "Delta", to: "Alpha" }
]);
}
window.addEventListener('DOMContentLoaded', init);
</script>
<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:400px; height:400px"></div>
<p>
This sample gives an example of customizing
<a>Tool.standardPinchZoomStart</a> and
<a>Tool.standardPinchZoomMove</a>.
Select a node and pinch zoom to see the action modify the scale of the Node instead
of the scale of the Diagram.
</p>
</div>
</div>
<!-- * * * * * * * * * * * * * -->
<!-- End of GoJS sample code -->
</div>
</body>
<!-- This script is part of the gojs.net website, and is not needed to run the sample -->
<script src="../assets/js/goSamples.js"></script>
</html>