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