<!--
Copyright (c) 2006-2013, JGraph Ltd
Level of detail example for mxGraph. This example demonstrates
implementing a level of detail per cell.
-->
<html>
<head>
<title>Level of detail 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
{
// Creates the graph inside the given container
var graph = new mxGraph(container);
graph.centerZoom = false;
// Links level of detail to zoom level but can be independent of zoom
graph.isCellVisible = function(cell)
{
return cell.lod == null || cell.lod / 2 < this.view.scale;
};
// 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, '1', 20, 20, 80, 30);
v1.lod = 1;
var v2 = graph.insertVertex(parent, null, '1', 200, 150, 80, 30);
v2.lod = 1;
var v3 = graph.insertVertex(parent, null, '2', 20, 150, 40, 20);
v3.lod = 2;
var v4 = graph.insertVertex(parent, null, '3', 200, 10, 20, 20);
v4.lod = 3;
var e1 = graph.insertEdge(parent, null, '2', v1, v2, 'strokeWidth=2');
e1.lod = 2;
var e2 = graph.insertEdge(parent, null, '2', v3, v4, 'strokeWidth=2');
e2.lod = 2;
var e2 = graph.insertEdge(parent, null, '3', v1, v4, 'strokeWidth=1');
e2.lod = 3;
}
finally
{
// Updates the display
graph.getModel().endUpdate();
}
document.body.appendChild(mxUtils.button('+', function()
{
graph.zoomIn();
}));
document.body.appendChild(mxUtils.button('-', function()
{
graph.zoomOut();
}));
}
};
</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="position:relative;overflow:hidden;width:621px;height:441px;background:url('editors/images/grid.gif');cursor:default;">
</div>
</body>
</html>