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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 Layer Load Monitoring Example</title>
<link rel="stylesheet" href="../theme/default/style.css" type="text/css">
<link rel="stylesheet" href="style.css" type="text/css">
<style type="text/css">
#controls {
float: left;
text-align: right;
}
#eventsLogID {
text-align: left;
width: 350px;
height: 475px;
overflow: auto;
border: 1px solid black;
}
</style>
<script src="../lib/Firebug/firebug.js"></script>
<script src="../lib/OpenLayers.js"></script>
<script type="text/javascript">
var lon = 5;
var lat = 40;
var zoom = 5;
var map, layer;
function init(){
eventsLog = OpenLayers.Util.getElement("eventsLogID");
map = new OpenLayers.Map( 'map' );
map.addControl(new OpenLayers.Control.LayerSwitcher());
buffer0 = new OpenLayers.Layer.WMS( "WMS Buffer 0",
"http://vmap0.tiles.osgeo.org/wms/vmap0",
{layers: 'basic'} ,
{ singleTile: false, buffer:0}
);
registerEvents(buffer0);
buffer1 = new OpenLayers.Layer.WMS( "WMS Buffer 1",
"http://vmap0.tiles.osgeo.org/wms/vmap0",
{layers: 'basic'} ,
{ singleTile: false, buffer:1}
);
registerEvents(buffer1);
buffer2 = new OpenLayers.Layer.WMS( "WMS Buffer 2",
"http://vmap0.tiles.osgeo.org/wms/vmap0",
{layers: 'basic'} ,
{ singleTile: false, buffer:2 }
);
registerEvents(buffer2);
singleTileLayer = new OpenLayers.Layer.WMS( "Single Tile Layer",
"http://vmap0.tiles.osgeo.org/wms/vmap0",
{layers: 'basic'} ,
{ singleTile: true}
);
registerEvents(singleTileLayer);
map.setCenter(new OpenLayers.LonLat(lon, lat), zoom);
}
function registerEvents(layer) {
layer.logEvent = function(event) {
eventsLog.innerHTML += "<br>(" + getTimeStamp() + ") " +
this.name + ": " + event;
};
layer.events.register("loadstart", layer, function() {
this.logEvent("Load Start");
});
layer.events.register("tileloaded", layer, function() {
this.logEvent("Tile loaded. " + this.numLoadingTiles + " left.");
});
layer.events.register("loadend", layer, function() {
this.logEvent("Load End. Grid:" + this.grid.length + "x" + this.grid[0].length);
});
map.addLayer(layer);
}
function getTimeStamp() {
var date = new Date();
var timeParts = [
date.getHours(),
date.getMinutes(),
date.getSeconds()
];
var timeStamp = timeParts.join(":");
return timeStamp;
}
function clearLog() {
eventsLog.innerHTML = "<b>Events Log:</b>";
}
</script>
</head>
<body onload="init()">
<h1 id="title">Layer Load Monitoring Example</h1>
<div id="tags">
monitor, loading, light
</div>
<p id="shortdesc">
Demonstrate a method for monitoring tile loading performance.
</p>
<div id="map" class="smallmap" style="float:left;"></div>
<div id="controls">
<div id="eventsLogID">
<b>Events Log:</b>
</div>
<input type="button" value="Clear" onclick="clearLog()"/>
</div>
<div id="docs">
</div>
</body>
</html>
|
