126 lines
4.5 KiB
HTML
126 lines
4.5 KiB
HTML
<!DOCTYPE html>
|
|
<html>
|
|
<head>
|
|
<meta name="viewport" content="width=device-width, initial-scale=1">
|
|
<title>Zoom Pinch GoJS Sample</title>
|
|
<meta name="description" content="Customize the pinch-zooming action of GoJS." />
|
|
<!-- Copyright 1998-2017 by Northwoods Software Corporation. -->
|
|
<meta charset="UTF-8">
|
|
<script src="../release/go.js"></script>
|
|
<script src="../assets/js/goSamples.js"></script> <!-- this is only for the GoJS Samples framework -->
|
|
<script id="code">
|
|
function init() {
|
|
if (window.goSamples) goSamples(); // init for these samples -- you don't need to call this
|
|
|
|
var $ = go.GraphObject.make; // for conciseness in defining templates
|
|
|
|
myDiagram = $(go.Diagram, "myDiagramDiv", // create a Diagram for the DIV HTML element
|
|
{
|
|
initialContentAlignment: go.Spot.Center, // center the content
|
|
"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"))
|
|
);
|
|
|
|
// Override normal pinch zoom to zoom the selected node instead of the Diagram.
|
|
|
|
var originalScale = 1;
|
|
var startDistance = 0; // how far apart the touches are at the start
|
|
var isPinching = false;
|
|
// Initiates pinch-zooming on multi-touch devices.
|
|
myDiagram.toolManager.standardPinchZoomStart = function() {
|
|
var diagram = this.diagram;
|
|
if (diagram === null) return;
|
|
var e = diagram.lastInput;
|
|
|
|
var first = e.getMultiTouchViewPoint(0, new go.Point());
|
|
var second = e.getMultiTouchViewPoint(1, new go.Point());
|
|
|
|
// event.isMultiTouch
|
|
// call doCancel to stop the rest of typical toolManager.domousedown/domousemove behavior
|
|
this.doCancel();
|
|
|
|
var node = diagram.selection.first();
|
|
if (node === null) return;
|
|
|
|
originalScale = node.scale;
|
|
var x = second.x - first.x;
|
|
var y = second.y - first.y;
|
|
var dist = Math.sqrt((x * x) + (y * y));
|
|
startDistance = dist;
|
|
e.bubbles = false;
|
|
isPinching = true;
|
|
myDiagram.startTransaction('zoom node');
|
|
};
|
|
|
|
// Continues pinch-zooming (started by {@link #standardPinchZoomStart} on multi-touch devices.
|
|
myDiagram.toolManager.standardPinchZoomMove = function() {
|
|
var diagram = this.diagram;
|
|
if (diagram === null) return;
|
|
var e = diagram.lastInput;
|
|
|
|
// event.isMultiTouch
|
|
// call doCancel to stop the rest of typical toolManager.domousedown/domousemove behavior
|
|
this.doCancel();
|
|
|
|
var first = e.getMultiTouchViewPoint(0, new go.Point());
|
|
var second = e.getMultiTouchViewPoint(1, new go.Point());
|
|
|
|
var x = second.x - first.x;
|
|
var y = second.y - first.y;
|
|
var dist = Math.sqrt((x * x) + (y * y));
|
|
var scale = dist / startDistance;
|
|
var oldskip = myDiagram.skipsUndoManager;
|
|
var node = diagram.selection.first();
|
|
if (node !== null) node.scale = originalScale * scale;
|
|
e.bubbles = false;
|
|
};
|
|
|
|
myDiagram.toolManager.doMouseUp = function() {
|
|
if (isPinching) {
|
|
myDiagram.commitTransaction('zoom node');
|
|
isPinching = false;
|
|
}
|
|
go.ToolManager.prototype.doMouseUp.call(this);
|
|
}
|
|
|
|
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" }
|
|
]);
|
|
}
|
|
</script>
|
|
</head>
|
|
<body onload="init()">
|
|
<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>
|
|
</body>
|
|
</html> |