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<!--
$Id: edgetolerance.html,v 1.1 2012/11/15 13:26:40 gaudenz Exp $
Copyright (c) 2006-2010, JGraph Ltd
Edge tolerance example for mxGraph. This example demonstrates increasing
the tolerance for hit detection on edges.
-->
<html>
<head>
<title>Edge tolerance example for mxGraph</title>
<!-- Sets the basepath for the library if not in same directory -->
<script type="text/javascript">
mxBasePath = '../src';
</script>
<!-- Loads and initializes the library -->
<script type="text/javascript" src="../src/js/mxClient.js"></script>
<!-- Example code -->
<script type="text/javascript">
// Program starts here. Creates a sample graph in the
// DOM node with the specified ID. This function is invoked
// from the onLoad event handler of the document (see below).
function main(container)
{
// Checks if the browser is supported
if (!mxClient.isBrowserSupported())
{
// Displays an error message if the browser is not supported.
mxUtils.error('Browser is not supported!', 200, false);
}
else
{
// Overrides the mouse event dispatching mechanism to update the
// cell which is associated with the event in case the native hit
// detection did not return anything.
var mxGraphFireMouseEvent = mxGraph.prototype.fireMouseEvent;
mxGraph.prototype.fireMouseEvent = function(evtName, me, sender)
{
// Checks if native hit detection did not return anything
if (me.getState() == null)
{
// Updates the graph coordinates in the event since we need
// them here. Storing them in the event means the overridden
// method doesn't have to do this again.
if (me.graphX == null || me.graphY == null)
{
var pt = mxUtils.convertPoint(this.container, me.getX(), me.getY());
me.graphX = pt.x;
me.graphY = pt.y;
}
var cell = this.getCellAt(me.graphX, me.graphY);
if (this.getModel().isEdge(cell))
{
me.state = this.view.getState(cell);
if (me.state != null && me.state.shape != null)
{
graph.container.style.cursor = me.state.shape.node.style.cursor;
}
}
}
if (me.state == null)
{
graph.container.style.cursor = 'default';
}
mxGraphFireMouseEvent.apply(this, arguments);
};
// Overrides double click handling to use the tolerance
var mxGraphDblClick = mxGraph.prototype.dblClick;
mxGraph.prototype.dblClick = function(evt, cell)
{
if (cell == null)
{
var pt = mxUtils.convertPoint(this.container,
mxEvent.getClientX(evt), mxEvent.getClientY(evt));
cell = this.getCellAt(pt.x, pt.y);
}
mxGraphDblClick.call(this, evt, cell);
};
// Creates the graph inside the given container
var graph = new mxGraph(container);
graph.setTolerance(20);
// Gets the default parent for inserting new cells. This
// is normally the first child of the root (ie. layer 0).
var parent = graph.getDefaultParent();
// Adds cells to the model in a single step
graph.getModel().beginUpdate();
try
{
var v1 = graph.insertVertex(parent, null, 'Hello,', 120, 120, 80, 30);
var v2 = graph.insertVertex(parent, null, 'World!', 400, 250, 80, 30);
var e1 = graph.insertEdge(parent, null, '', v1, v2, 'edgeStyle=orthogonalEdgeStyle;');
var e2 = graph.insertEdge(parent, null, '', v2, v1, 'edgeStyle=orthogonalEdgeStyle;');
}
finally
{
// Updates the display
graph.getModel().endUpdate();
}
}
};
</script>
</head>
<!-- Page passes the container for the graph to the program -->
<body onload="main(document.getElementById('graphContainer'))">
<!-- Creates a container for the graph with a grid wallpaper -->
<div id="graphContainer"
style="overflow:hidden;width:641px;height:481px;background:url('editors/images/grid.gif');cursor:default;">
</div>
</body>
</html>