<!-- 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>