168 lines
4.8 KiB
HTML
168 lines
4.8 KiB
HTML
<!--
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$Id: guides.html,v 1.7 2012-07-17 08:22:19 gaudenz Exp $
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Copyright (c) 2006-2010, JGraph Ltd
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Guides example for mxGraph. This example demonstrates the guides
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feature which aligns the current selection to the existing vertices
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in the graph. This feature is in RFC state. Creating a grid using
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a canvas and installing a key handler for cursor keys is also
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demonstrated here, as well as snapping waypoints to terminals.
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-->
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<html>
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<head>
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<title>Guides example for mxGraph</title>
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<!-- Sets the basepath for the library if not in same directory -->
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<script type="text/javascript">
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mxBasePath = '../src';
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</script>
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<!-- Loads and initializes the library -->
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<script type="text/javascript" src="../src/js/mxClient.js"></script>
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<!-- Example code -->
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<script type="text/javascript">
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// Program starts here. Creates a sample graph in the
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// DOM node with the specified ID. This function is invoked
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// from the onLoad event handler of the document (see below).
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function main(container)
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{
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// Checks if the browser is supported
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if (!mxClient.isBrowserSupported())
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{
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// Displays an error message if the browser is not supported.
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mxUtils.error('Browser is not supported!', 200, false);
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}
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else
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{
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// Enables guides
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mxGraphHandler.prototype.guidesEnabled = true;
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// Alt disables guides
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mxGraphHandler.prototype.useGuidesForEvent = function(me)
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{
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return !mxEvent.isAltDown(me.getEvent());
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};
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// Defines the guides to be red (default)
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mxConstants.GUIDE_COLOR = '#FF0000';
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// Defines the guides to be 1 pixel (default)
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mxConstants.GUIDE_STROKEWIDTH = 1;
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// Enables snapping waypoints to terminals
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mxEdgeHandler.prototype.snapToTerminals = true;
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// Enables crisp rendering of rectangles in SVG
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mxRectangleShape.prototype.crisp = true;
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// Creates the graph inside the given container
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var graph = new mxGraph(container);
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graph.setConnectable(true);
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graph.gridSize = 30;
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// Changes the default style for edges "in-place" and assigns
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// an alternate edge style which is applied in mxGraph.flip
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// when the user double clicks on the adjustment control point
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// of the edge. The ElbowConnector edge style switches to TopToBottom
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// if the horizontal style is true.
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var style = graph.getStylesheet().getDefaultEdgeStyle();
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style[mxConstants.STYLE_ROUNDED] = true;
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style[mxConstants.STYLE_EDGE] = mxEdgeStyle.ElbowConnector;
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graph.alternateEdgeStyle = 'elbow=vertical';
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// Enables rubberband selection
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new mxRubberband(graph);
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// Gets the default parent for inserting new cells. This
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// is normally the first child of the root (ie. layer 0).
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var parent = graph.getDefaultParent();
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// Adds cells to the model in a single step
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graph.getModel().beginUpdate();
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var v1;
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try
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{
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v1 = graph.insertVertex(parent, null, 'Hello,', 20, 40, 80, 70);
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var v2 = graph.insertVertex(parent, null, 'World!', 200, 140, 80, 40);
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var e1 = graph.insertEdge(parent, null, '', v1, v2);
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}
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finally
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{
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// Updates the display
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graph.getModel().endUpdate();
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}
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// Handles cursor keys
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var nudge = function(keyCode)
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{
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if (!graph.isSelectionEmpty())
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{
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var dx = 0;
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var dy = 0;
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if (keyCode == 37)
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{
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dx = -1;
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}
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else if (keyCode == 38)
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{
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dy = -1;
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}
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else if (keyCode == 39)
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{
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dx = 1;
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}
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else if (keyCode == 40)
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{
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dy = 1;
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}
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graph.moveCells(graph.getSelectionCells(), dx, dy);
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}
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};
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// Transfer initial focus to graph container for keystroke handling
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graph.container.focus();
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// Handles keystroke events
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var keyHandler = new mxKeyHandler(graph);
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// Ignores enter keystroke. Remove this line if you want the
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// enter keystroke to stop editing
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keyHandler.enter = function() {};
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keyHandler.bindKey(37, function()
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{
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nudge(37);
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});
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keyHandler.bindKey(38, function()
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{
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nudge(38);
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});
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keyHandler.bindKey(39, function()
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{
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nudge(39);
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});
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keyHandler.bindKey(40, function()
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{
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nudge(40);
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});
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}
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};
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</script>
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</head>
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<!-- Page passes the container for the graph to the program -->
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<body onload="main(document.getElementById('graphContainer'))">
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<!-- Creates a container for the graph with a grid wallpaper -->
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<div id="graphContainer"
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style="overflow:hidden;width:821px;height:641px;background:url('editors/images/grid.gif');cursor:default;">
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</div>
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</body>
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</html>
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