openlayers/examples/custom-control.html

   1 <html xmlns="http://www.w3.org/1999/xhtml">
   2     <head>
   3         <title>Custom Control 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 type="text/javascript">
   8             var lon = 5;
   9             var lat = 40;
  10             var zoom = 5;
  11             var map, layer;
  12
  13             function init(){
  14                 map = new OpenLayers.Map('map');
  15                 layer = new OpenLayers.Layer.WMS( "OpenLayers WMS",
  16                         "http://labs.metacarta.com/wms/vmap0", {layers: 'basic'} );
  17
  18                 var control = new OpenLayers.Control();
  19                 OpenLayers.Util.extend(control, {
  20                     draw: function () {
  21                         // this Handler.Box will intercept the shift-mousedown
  22                         // before Control.MouseDefault gets to see it
  23                         this.box = new OpenLayers.Handler.Box( control,
  24                             {"done": this.notice},
  25                             {keyMask: OpenLayers.Handler.MOD_SHIFT});
  26                         this.box.activate();
  27                     },
  28
  29                     notice: function (bounds) {
  30                         var ll = map.getLonLatFromPixel(new OpenLayers.Pixel(bounds.left, bounds.bottom));
  31                         var ur = map.getLonLatFromPixel(new OpenLayers.Pixel(bounds.right, bounds.top));
  32                         alert(ll.lon.toFixed(4) + ", " +
  33                               ll.lat.toFixed(4) + ", " +
  34                               ur.lon.toFixed(4) + ", " +
  35                               ur.lat.toFixed(4));
  36                     }
  37                 });
  38
  39                 map.addLayer(layer);
  40                 map.addControl(control);
  41                 map.setCenter(new OpenLayers.LonLat(lon, lat), zoom);
  42             }
  43         </script>
  44     </head>
  45     <body onload="init()">
  46         <h1 id="title">Custom Control Example</h1>
  47
  48           <div id="tags">
  49         </div>
  50
  51         <p id="shortdesc">
  52             Demonstrate the addition of a draggable rectangle to the OpenLayers window.
  53         </p>
  54
  55         <div id="map" class="smallmap"></div>
  56
  57         <div id="docs"></div>
  58     </body>
  59 </html>