1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
|
<!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>
|
