openlayers/examples/osm-layer.html

   1 <html xmlns="http://www.w3.org/1999/xhtml">
   2   <head>
   3     <title>OpenLayers: OSM Layer</title>
   4     <link rel="stylesheet" href="../theme/default/style.css" type="text/css" />
   5     <link rel="stylesheet" href="style.css" type="text/css" />
   6     <style>
   7         #map {
   8             height: 350px;
   9         }
  10     </style>
  11     <script src="../lib/OpenLayers.js"></script>
  12     <script type="text/javascript">
  13         var lon = 5;
  14         var lat = 40;
  15         var zoom = 5;
  16         var map, layer, gml;
  17         function export_vectors() {
  18             var x = new OpenLayers.Format.XML();
  19             var content = x.write(gml.renderer.rendererRoot);
  20             $("vectors").value = content;
  21             $("vectors").style.display = "block";
  22             $("vectorlink").href = "data:image/svg+xml," + escape(content);
  23             $("vectorlink").style.display="block";
  24         }
  25         function on_feature_hover(feature) {
  26             var text ="<ul>";
  27             var type ="way";
  28             if (feature.geometry.CLASS_NAME == "OpenLayers.Geometry.Point") {
  29                 type = "node";
  30             }
  31             text += "<li>" + feature.osm_id + ": <a href='http://crschmidt.net/osm/attributes.html?type="+type+"&id="+feature.osm_id+"'>Edit</a>, <a href='http://www.openstreetmap.org/api/0.5/"+type + "/" + feature.osm_id + "'>API</a></li>";
  32             for (var key in feature.attributes) {
  33                 text += "<li>" + key + ": " + feature.attributes[key] + "</li>";
  34             }
  35             text += "</ul>";
  36             $("status").innerHTML = text;
  37         }
  38         function clear_data() {
  39             gml.destroyFeatures();
  40         }
  41         function new_data() {
  42             if (!check_zoom()) { return; }
  43             clear_data();
  44             gml.loaded = false;
  45             gml.url = "http://www.openstreetmap.org/api/0.5/map?bbox=" + map.getExtent().toBBOX();
  46             $("status").innerHTML = "Loading more data...";
  47             gml.loadGML();
  48         }
  49         function style_osm_feature(feature) {
  50             feature.style = OpenLayers.Util.extend({'fill':'black'}, OpenLayers.Feature.Vector.style['default']);
  51             if (feature.attributes.highway == "motorway") {
  52                 feature.style.strokeColor = "blue";
  53                 feature.style.strokeWidth = 5;
  54             } else if (feature.attributes.highway == "primary") {
  55                 feature.style.strokeColor = "red";
  56             } else if (feature.attributes.highway == "secondary") {
  57                 feature.style.strokeColor = "orange";
  58             } else if (feature.attributes.highway) {
  59                 feature.style.strokeColor = "black";
  60             }
  61         }
  62         function check_zoom() {
  63             var zoom = map.getZoom();
  64             if (zoom >= 11) { return true; }
  65             if (zoom >= 9) { return confirm("Loading this amount of data may slow your browser. Are you sure you want to do this?"); }
  66             $("status").innerHTML = "Area too large. Zoom in to load data. (Current zoom level: "+ zoom + ". Must be at zoom 9+.)";
  67             return false;
  68         }
  69         function init(){
  70             OpenLayers.ProxyHost = "proxy.cgi?url=";
  71             OpenLayers.Feature.Vector.style['default'].strokeWidth = 4;
  72             OpenLayers.Feature.Vector.style['default'].cursor = 'pointer';
  73             map = new OpenLayers.Map('map', {'maxResolution': 360/512/16, 'numZoomLevels':15, controls: [ new OpenLayers.Control.Navigation(), new OpenLayers.Control.PanZoomBar() ]});
  74             map.addControl(new OpenLayers.Control.LayerSwitcher());
  75             map.addControl(new OpenLayers.Control.Permalink());
  76             layer = new OpenLayers.Layer.WMS( "OSM",
  77                [
  78                  "http://t1.hypercube.telascience.org/tiles?",
  79                  "http://t2.hypercube.telascience.org/tiles?",
  80                  "http://t3.hypercube.telascience.org/tiles?",
  81                  "http://t4.hypercube.telascience.org/tiles?"
  82                  ],
  83                 {layers: 'osm-4326', format: 'image/png' } );
  84             map.addLayer(layer);
  85             if (!map.getCenter()) {
  86                 gml = new OpenLayers.Layer.GML("OSM", "osm/sutton_coldfield.osm", {format: OpenLayers.Format.OSM});
  87                 map.zoomToExtent(new OpenLayers.Bounds(-1.819072,52.549034,-1.814341,52.551582));
  88             } else {
  89                 if (map.getZoom() >= 11) {
  90                     gml = new OpenLayers.Layer.GML("OSM", "http://www.openstreetmap.org/api/0.5/map?bbox=" + map.getExtent().toBBOX(), {format: OpenLayers.Format.OSM});
  91                 } else {
  92                     gml = new OpenLayers.Layer.GML("OSM", "xml/cambridgeport.osm", {format: OpenLayers.Format.OSM});
  93                 }
  94             }
  95             gml.events.register("loadstart", null, function() { $("status").innerHTML = "Loading..."; })
  96             gml.events.register("loadend", null, function() { $("status").innerHTML = ""; })
  97             map.addLayer(gml);
  98             gml.preFeatureInsert = style_osm_feature;
  99             var sf = new OpenLayers.Control.SelectFeature(gml, {'onSelect': on_feature_hover});
 100             map.addControl(sf);
 101             sf.activate();
 102         }
 103     </script>
 104   </head>
 105   <body onload="init()">
 106     <h1 id="title">Advanced OSM Layer</h1>
 107     <div id="map" class="smallmap"></div>
 108     <div id="download">
 109       <ul>
 110        <li><a href="javascript:new_data();">Download current view</a></li>
 111        <li><a href="javascript:clear_data();">Clear current data</a></li>
 112        <li><a href="javascript:export_vectors();">Export Vector Data</a></li>
 113       </ul>
 114     <div id="status">Loading...</div>
 115     </div>
 116     <a id="vectorlink" href="" style="display:none">Display via data: URL (FF Only)</a>
 117     <textarea id="vectors" style="display:none;width:100%" rows="10"></textarea>
 118   </body>
 119 </html>