Add an icon sprite webgl example

examples/icon-sprite-webgl.js

@@ -0,0 +1,60 @@
+goog.require('ol.Feature');
+goog.require('ol.Map');
+goog.require('ol.View');
+goog.require('ol.geom.Point');
+goog.require('ol.layer.Vector');
+goog.require('ol.source.Vector');
+goog.require('ol.style.Icon');
+goog.require('ol.style.Style');
+
+
+var iconInfo = [
+  {size: [55, 55], offset: [0, 0]},
+  {size: [55, 55], offset: [110, 86]},
+  {size: [55, 86], offset: [55, 0]}
+];
+
+var i;
+
+var iconCount = iconInfo.length;
+var icons = new Array(iconCount);
+for (i = 0; i < iconCount; ++i) {
+  icons[i] = new ol.style.Icon({
+    src: 'data/Butterfly.png',
+    size: iconInfo[i].size,
+    offset: iconInfo[i].offset
+  });
+}
+
+var featureCount = 10000;
+var features = new Array(featureCount);
+var feature, geometry;
+var e = 25000000;
+for (i = 0; i < featureCount; ++i) {
+  geometry = new ol.geom.Point(
+      [2 * e * Math.random() - e, 2 * e * Math.random() - e]);
+  feature = new ol.Feature(geometry);
+  feature.setStyle(
+      new ol.style.Style({
+        image: icons[i % iconCount]
+      })
+  );
+  features[i] = feature;
+}
+
+var vectorSource = new ol.source.Vector({
+  features: features
+});
+var vector = new ol.layer.Vector({
+  source: vectorSource
+});
+
+var map = new ol.Map({
+  renderer: 'webgl',
+  layers: [vector],
+  target: document.getElementById('map'),
+  view: new ol.View({
+    center: [0, 0],
+    zoom: 5
+  })
+});