openlayers/examples/wfs-reprojection.html

   1 <html xmlns="http://www.w3.org/1999/xhtml">
   2   <head>
   3     <title>WFS Reprojection + Canvas Renderer Example</title>
   4     <link rel="stylesheet" href="../theme/default/style.css" type="text/css" />
   5     <link rel="stylesheet" href="style.css" type="text/css" />
   6     <script src="../lib/OpenLayers.js"></script>
   7     <script src='http://maps.google.com/maps?file=api&amp;v=2&amp;key=ABQIAAAAjpkAC9ePGem0lIq5XcMiuhR_wWLPFku8Ix9i2SXYRVK3e45q1BQUd_beF8dtzKET_EteAjPdGDwqpQ'></script>
   8     <script type="text/javascript">
   9
  10         var map, layer, styleMap;
  11         OpenLayers.ProxyHost = "/proxy/?url=";
  12         function init(){
  13
  14             map = new OpenLayers.Map('map', {
  15                 projection: new OpenLayers.Projection("EPSG:900913"),
  16                 displayProjection: new OpenLayers.Projection("EPSG:4326"),
  17                 units: "m",
  18                 maxResolution: 156543.0339,
  19                 maxExtent: new OpenLayers.Bounds(-20037508.34, -20037508.34,
  20                                                  20037508.34, 20037508.34)
  21             });
  22
  23             var g = new OpenLayers.Layer.Google("G", {sphericalMercator: true});
  24             map.addLayers([g]);
  25
  26             // prepare to style the data
  27             styleMap = new OpenLayers.StyleMap({
  28                 strokeColor: "black",
  29                 strokeWidth: 2,
  30                 strokeOpacity: 0.5,
  31                 fillOpacity: 0.2
  32             });
  33             // create a color table for state FIPS code
  34             var colors = ["red", "orange", "yellow", "green", "blue", "purple"];
  35             var code, fips = {};
  36             for(var i=1; i<=66; ++i) {
  37                 code = "0" + i;
  38                 code = code.substring(code.length - 2);
  39                 fips[code] = {fillColor: colors[i % colors.length]};
  40             }
  41             // add unique value rules with your color lookup
  42             styleMap.addUniqueValueRules("default", "STATE_FIPS", fips);
  43
  44             // create a wfs layer with a projection different than the map
  45             // (only if your wfs doens't support your map projection)
  46             var wfs = layer = new OpenLayers.Layer.WFS(
  47                 "States (SVG)",
  48                 "http://sigma.openplans.org/geoserver/ows",
  49                 {typename: 'topp:states'},
  50                 {
  51                     typename: 'states',
  52                     featureNS: 'http://www.openplans.org/topp',
  53                     projection: new OpenLayers.Projection("EPSG:4326"),
  54                     extractAttributes: true,
  55                     ratio: 1.2,
  56                     styleMap: styleMap
  57                 }
  58             );
  59             map.addLayer(wfs);
  60
  61             var wfs = layer = new OpenLayers.Layer.WFS(
  62                 "States (Canvas)",
  63                 "http://sigma.openplans.org/geoserver/ows",
  64                 {typename: 'topp:states'},
  65                 {
  66                     typename: 'states',
  67                     featureNS: 'http://www.openplans.org/topp',
  68                     projection: new OpenLayers.Projection("EPSG:4326"),
  69                     extractAttributes: true,
  70                     ratio: 1.2,
  71                     styleMap: styleMap,
  72                     renderers: ['Canvas', 'SVG', 'VML']
  73                 }
  74             );
  75             map.addLayer(wfs);
  76             map.addControl(new OpenLayers.Control.LayerSwitcher());
  77
  78             // if you want to use Geographic coords, transform to ESPG:900913
  79             var ddBounds = new OpenLayers.Bounds(
  80                 -73.839111,40.287907,-68.214111,44.441624
  81             );
  82             map.zoomToExtent(
  83                 ddBounds.transform(map.displayProjection, map.getProjectionObject())
  84             );
  85         }
  86     </script>
  87   </head>
  88   <body onload="init()">
  89
  90   <h1 id="title">WFS Reprojection + Canvas Renderer Example</h1>
  91
  92   <div id="tags">
  93   </div>
  94   <p id="shortdesc">
  95         Shows the use of the WFS layer reprojection support
  96   </p>
  97
  98         <div id="map" class="smallmap"></div>
  99
 100   <div id="docs">
 101     <p>This example shows automatic WFS reprojection, displaying an 'unprojected'
 102     WFS layer projected on the client side over Google Maps. The key configuration
 103     here is the 'projection' option on the WFS layer.</p>
 104     <p>Also shown is styleMap for the layer with unique value rules.  Colors
 105     are assigned based on the STATE_FIPS attribute.</p>
 106     <p>Additionally, this map demonstrates the Canvas/SVG renderers in browsers
 107        which support both. See the two different layers in the
 108        LayerSwitcher.</p>
 109   </div>
 110
 111
 112
 113   </body>
 114 </html>