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<!--
Copyright (c) 2006-2013, JGraph Ltd
Map example for mxGraph. This example demonstrates using
a graph container as a Google Maps overlay.
-->
<html>
<html>
<head>
<title>Google maps example for mxGraph</title>
<meta charset="utf-8">
<title>Adding a Custom Overlay</title>
<style>
html, body, #map-canvas {
height: 100%;
margin: 0px;
padding: 0px
}
</style>
<script src="https://maps.googleapis.com/maps/api/js?v=3.exp&sensor=false"></script>
<!-- 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">
// Keeps the font sizes independent of the scale
mxCellRenderer.prototype.getTextScale = function(state)
{
return 1;
};
// This example creates a custom overlay called mxGraphOverlay, containing
// a mxGraph container.
// Set the custom overlay object's prototype to a new instance
// of OverlayView. In effect, this will subclass the overlay class.
// Note that we set the prototype to an instance, rather than the
// parent class itself, because we do not wish to modify the parent class.
var overlay;
mxGraphOverlay.prototype = new google.maps.OverlayView();
// Initialize the map and the custom overlay.
function initialize()
{
var mapOptions = {
zoom: 4,
center: new google.maps.LatLng(34, -96),
mapTypeId: google.maps.MapTypeId.ROADMAP,
styles: [{featureType: "road", stylers: [{visibility: "off"}]},
{"elementType": "labels", "stylers": [{"visibility": "off" }]}]
};
var map = new google.maps.Map(document.getElementById('map-canvas'), mapOptions);
var swBound = new google.maps.LatLng(18, -126);
var neBound = new google.maps.LatLng(50, -65);
var bounds = new google.maps.LatLngBounds(swBound, neBound);
// The custom mxGraphOverlay object contains the graph,
// the bounds of the graph, and a reference to the map.
overlay = new mxGraphOverlay(bounds, map);
}
function mxGraphOverlay(bounds, map)
{
// Initialize all properties.
this.bounds_ = bounds;
this.map_ = map;
// Define a property to hold the graph's div. We'll
// actually create this div upon receipt of the onAdd()
// method so we'll leave it null for now.
this.div_ = null;
// Explicitly call setMap on this overlay.
this.setMap(map);
}
/**
* onAdd is called when the map's panes are ready and the overlay has been
* added to the map.
*/
mxGraphOverlay.prototype.onAdd = function()
{
var div = document.createElement('div');
div.style.borderStyle = 'none';
div.style.borderWidth = '0px';
div.style.overflow = 'visible';
div.style.position = 'absolute';
// Allows labels to be rendered outside the container
mxClient.NO_FO = true;
// Creates the graph inside the given container
var graph = new mxGraph(div);
graph.setHtmlLabels(true);
graph.view.setTranslate(4, 4);
// Sets default vertex style
var style = new Object();
style[mxConstants.STYLE_SHAPE] = mxConstants.SHAPE_ELLIPSE;
style[mxConstants.STYLE_PERIMETER] = mxPerimeter.EllipsePerimeter;
style[mxConstants.STYLE_FILLCOLOR] = '#8CCDF5';
style[mxConstants.STYLE_STROKECOLOR] = '#1B78C8';
style[mxConstants.STYLE_FONTCOLOR] = '#000000';
style[mxConstants.STYLE_OPACITY] = '50';
style[mxConstants.STYLE_FONTSIZE] = '16';
graph.getStylesheet().putDefaultVertexStyle(style);
// Gets label from custom user object
graph.convertValueToString = function(cell)
{
return (cell.value != null && cell.value.label != null) ? cell.value.label : mxGraph.prototype.convertValueToString.apply(this, arguments);
};
// Implements level of detail
graph.isCellVisible = function(cell)
{
return (cell.value != null && cell.value.minScale != null) ? cell.value.minScale <= this.view.scale : mxGraph.prototype.isCellVisible.apply(this, arguments);
};
// Enables rubberband selection
new mxRubberband(graph);
// 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 n1 = graph.insertVertex(parent, null, {label:'Seattle'}, 23, 23, 10, 10);
var n2 = graph.insertVertex(parent, null, {label:'Sunnyvale'}, 25.76, 148.4, 10, 10);
var n3 = graph.insertVertex(parent, null, {label:'Los Angeles'}, 59.8, 185.25, 10, 10);
var n4 = graph.insertVertex(parent, null, {label:'Denver'}, 179.39, 121.25, 10, 10);
var n5 = graph.insertVertex(parent, null, {label:'Kansas'}, 273.30, 128.63, 10, 10);
var n6 = graph.insertVertex(parent, null, {label:'Houston'}, 266.36, 230.7, 10, 10);
var n7 = graph.insertVertex(parent, null, {label:'Chicago'}, 336, 95.67, 10, 10);
var n8 = graph.insertVertex(parent, null, {label:'Indianapolis'}, 349.38, 120.85, 10, 10);
var n9 = graph.insertVertex(parent, null, {label:'Atlanta'}, 365.23, 188.51, 10, 10);
var n10 = graph.insertVertex(parent, null, {label:'New York'}, 458.83, 109.61, 10, 10);
var n11 = graph.insertVertex(parent, null, {label:'Washington'}, 432.93, 129.52, 10, 10);
// This node and its connections are only visible for zoom 200% and above
var n12 = graph.insertVertex(parent, null, {label:'Columbus', minScale:2}, 380, 120, 10, 10);
var estyle = 'strokeWidth=2;endArrow=none;labelBackgroundColor=white;';
var e = [graph.insertEdge(parent, null, '', n1, n2, estyle),
graph.insertEdge(parent, null, '', n2, n3, estyle),
graph.insertEdge(parent, null, '', n1, n4, estyle),
graph.insertEdge(parent, null, '', n2, n4, estyle),
graph.insertEdge(parent, null, '', n3, n6, estyle),
graph.insertEdge(parent, null, '', n4, n5, estyle),
graph.insertEdge(parent, null, '', n5, n6, estyle),
graph.insertEdge(parent, null, '', n5, n8, estyle),
graph.insertEdge(parent, null, '', n6, n9, estyle),
graph.insertEdge(parent, null, '', n8, n7, estyle),
graph.insertEdge(parent, null, '', n7, n10, estyle),
graph.insertEdge(parent, null, '', n9, n11, estyle),
graph.insertEdge(parent, null, '', n10, n11, estyle),
graph.insertEdge(parent, null, '', n8, n9, estyle),
graph.insertEdge(parent, null, '', n8, n12, estyle),
graph.insertEdge(parent, null, '', n12, n11, estyle)];
}
finally
{
// Updates the display
graph.getModel().endUpdate();
}
// Writes some random numbers on the connections
window.setInterval(function()
{
graph.getModel().beginUpdate();
try
{
for (var i = 0; i < e.length; i++)
{
var rnd = Math.random();
graph.getModel().setValue(e[i], Math.round(rnd * 100));
}
}
finally
{
graph.getModel().endUpdate();
}
}, 1000);
this.graph_ = graph;
this.div_ = div;
// Add the element to the "overlayLayer" pane.
var panes = this.getPanes();
panes.overlayLayer.appendChild(div);
};
mxGraphOverlay.prototype.draw = function()
{
// We use the south-west and north-east
// coordinates of the overlay to peg it to the correct position and size.
// To do this, we need to retrieve the projection from the overlay.
var overlayProjection = this.getProjection();
// Retrieve the south-west and north-east coordinates of this overlay
// in LatLngs and convert them to pixel coordinates.
// We'll use these coordinates to resize the div.
var sw = overlayProjection.fromLatLngToDivPixel(this.bounds_.getSouthWest());
var ne = overlayProjection.fromLatLngToDivPixel(this.bounds_.getNorthEast());
// Resize the graph's div to fit the indicated dimensions.
var div = this.div_;
div.style.left = sw.x + 'px';
div.style.top = ne.y + 'px';
var w = (ne.x - sw.x);
var h = (sw.y - ne.y);
div.style.width = w + 'px';
div.style.height = h + 'px';
// Sets the scale of the graph based on reference width
this.graph_.view.setScale(w / 550);
};
// The onRemove() method will be called automatically from the API if
// we ever set the overlay's map property to 'null'.
mxGraphOverlay.prototype.onRemove = function()
{
this.div_.parentNode.removeChild(this.div_);
this.div_ = null;
};
google.maps.event.addDomListener(window, 'load', initialize);
</script>
</head>
<!-- Page passes the container for the graph to the program -->
<body>
<div id="map-canvas"></div>
</body>
</html>