text: <!--
    Copyright (c) 2006-2013, 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>
  