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<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title>Vector Features Performance Test</title>
<style type="text/css">
body {
font-size: 0.8em;
}
p {
padding-top: 1em;
}
#map {
width: 512px;
height: 512px;
border: 1px solid black;
}
</style>
<script src="../../lib/Firebug/firebug.js"></script>
<script src="../../lib/OpenLayers.js"></script>
<script type="text/javascript">
var map, vectorLayer, drawFeature, features
var run = 0;
function nextRun() {
window.setTimeout(function() {
if (run < 5) {
vectorLayer.removeFeatures(features);
}
}, 900);
window.setTimeout(function(){
run++;
switch(run) {
case 1:
console.log("First run - feature bboxes will be cached");
map.setCenter(new OpenLayers.LonLat(-22.5, -22.5), 3);
vectorTestNew()
break;
case 2:
console.log("Test with all features inside extent");
vectorTestOld();
break;
case 3:
vectorTestNew();
break;
case 4:
console.log("Test with some features outside extent");
map.setCenter(new OpenLayers.LonLat(-22.5, -22.5), 5);
vectorTestOld();
break;
case 5:
vectorTestNew();
break;
}
}, 1000);
}
function vectorTestOld(){
vectorLayer.renderer.drawFeature = function(feature, style) {
if(style == null) {
style = feature.style;
}
if (feature.geometry) {
this.drawGeometry(feature.geometry, style, feature.id);
}
};
console.time("addFeaturesOld");
vectorLayer.addFeatures(features);
console.timeEnd("addFeaturesOld");
}
function vectorTestNew() {
vectorLayer.renderer.drawFeature = OpenLayers.Renderer[vectorLayer.renderer.CLASS_NAME.split(".")[2]].prototype.drawFeature;
console.time("addFeatures");
vectorLayer.addFeatures(features);
console.timeEnd("addFeatures");
}
function init(){
// allow testing of specific renderers via "?renderer=Canvas", etc
var renderer = OpenLayers.Util.getParameters(window.location.href).renderer;
renderer = (renderer) ? [renderer] : OpenLayers.Layer.Vector.prototype.renderers;
map = new OpenLayers.Map('map');
vectorLayer = new OpenLayers.Layer.Vector("Vector Layer", {
isBaseLayer: true,
renderers: renderer
});
map.addLayers([vectorLayer]);
map.addControl(new OpenLayers.Control.MousePosition());
map.setCenter(new OpenLayers.LonLat(-22.5, -22.5), 3);
vectorLayer.events.register("featuresadded", this, nextRun);
features = new Array(200);
var x, y
for (var i = 0; i < 200; i++) {
x = -Math.random()*45;
y = -Math.random()*45;
features[i] = new OpenLayers.Feature.Vector(
new OpenLayers.Geometry.LinearRing([
new OpenLayers.Geometry.Point(
-Math.random()*5+x, -Math.random()*5+y),
new OpenLayers.Geometry.Point(
-Math.random()*5+x, -Math.random()*5+y),
new OpenLayers.Geometry.Point(
-Math.random()*5+x, -Math.random()*5+y),
new OpenLayers.Geometry.Point(
-Math.random()*5+x, -Math.random()*5+y),
new OpenLayers.Geometry.Point(
-Math.random()*5+x, -Math.random()*5+y),
new OpenLayers.Geometry.Point(
-Math.random()*5+x, -Math.random()*5+y),
new OpenLayers.Geometry.Point(
-Math.random()*5+x, -Math.random()*5+y),
new OpenLayers.Geometry.Point(
-Math.random()*5+x, -Math.random()*5+y),
new OpenLayers.Geometry.Point(
-Math.random()*5+x, -Math.random()*5+y),
new OpenLayers.Geometry.Point(
-Math.random()*5+x, -Math.random()*5+y)
]));
}
nextRun();
}
</script>
</head>
<body onload="init()">
<h1 id="title">New Rendering - Vector Features Performance Test</h1>
<div id="map"></div>
<p>
This test examines if checking for a feature being inside the visible
extent before rendering it has an impact on performance. Open the Firebug
console after running this test (hit F12) to see the results.
<br/>
After the performance test, you can drag around the map to see how the new
vector rendering feels where features get rendered only when they are visible
inside the map extent.
</p>
</body>
</html>
|
