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+<!DOCTYPE html>
+<html>
+ <head>
+ <meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+ <meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=1.0, user-scalable=0">
+ <meta name="apple-mobile-web-app-capable" content="yes">
+ <title>OpenLayers Buffer Example</title>
+ <link rel="stylesheet" href="../theme/default/style.css" type="text/css">
+ <link rel="stylesheet" href="style.css" type="text/css">
+ <script src="../lib/OpenLayers.js"></script>
+ <script type="text/javascript">
+ var lon = 0;
+ var lat = 0;
+ var zoom = 2;
+ var map, layer;
+
+ function init(){
+ map = new OpenLayers.Map( 'map' );
+ layer = new OpenLayers.Layer.WMS( "0 buffer: OpenLayers WMS",
+ "http://vmap0.tiles.osgeo.org/wms/vmap0",
+ {layers: 'basic'}, {'buffer':0} );
+ map.addLayer(layer);
+ layer = new OpenLayers.Layer.WMS( "1 buffer: OpenLayers WMS",
+ "http://vmap0.tiles.osgeo.org/wms/vmap0",
+ {layers: 'basic'}, {'buffer':1} );
+ map.addLayer(layer);
+ layer = new OpenLayers.Layer.WMS( "4 buffer: OpenLayers WMS",
+ "http://vmap0.tiles.osgeo.org/wms/vmap0",
+ {layers: 'basic'}, {'buffer':4} );
+ map.addLayer(layer);
+ map.addControl(new OpenLayers.Control.LayerSwitcher());
+ map.setCenter(new OpenLayers.LonLat(lon, lat), zoom);
+ }
+ </script>
+ </head>
+ <body onload="init()">
+ <h1 id="title">Buffer Example</h1>
+
+ <div id="tags">
+ buffer, performance, tile, light
+ </div>
+
+ <p id="shortdesc">
+ This example shows the use of the buffer layer option for any layer that inherits from OpenLayers.Layer.Grid.
+ </p>
+
+ <div id="map" class="smallmap"></div>
+
+ <div id="docs">
+ Use the buffer property to control how many tiles are included
+ outside the visible map area. Default is 0.
+ </div>
+ </body>
+</html>