Add dynamic data example

examples/dynamic-data.js

@@ -0,0 +1,53 @@
+goog.require('ol.Map');
+goog.require('ol.RendererHint');
+goog.require('ol.View2D');
+goog.require('ol.geom.MultiPoint');
+goog.require('ol.layer.Tile');
+goog.require('ol.source.MapQuestOpenAerial');
+goog.require('ol.symbol');
+
+
+var map = new ol.Map({
+  layers: [
+    new ol.layer.Tile({
+      source: new ol.source.MapQuestOpenAerial()
+    })
+  ],
+  renderer: ol.RendererHint.CANVAS,
+  target: 'map',
+  view: new ol.View2D({
+    center: [0, 0],
+    zoom: 2
+  })
+});
+map.beforeRender(function(map, frameState) {
+  frameState.animate = true;
+  return true;
+});
+var imageStyle = ol.symbol.renderCircle(5, {
+  color: 'yellow'
+}, {
+  color: 'red',
+  width: 1
+});
+var n = 200;
+var omegaTheta = 30000; // Rotation period in ms
+var R = 7e6;
+var r = 2e6;
+var p = 2e6;
+map.on('postcompose', function(event) {
+  var render = event.getRender();
+  var frameState = event.getFrameState();
+  var theta = 2 * Math.PI * frameState.time / omegaTheta;
+  var coordinates = [];
+  var i;
+  for (i = 0; i < n; ++i) {
+    var t = theta + 2 * Math.PI * i / n;
+    var x = (R + r) * Math.cos(t) + p * Math.cos((R + r) * t / r);
+    var y = (R + r) * Math.sin(t) + p * Math.sin((R + r) * t / r);
+    coordinates.push([x, y]);
+  }
+  render.setImageStyle(imageStyle);
+  render.drawMultiPointGeometry(new ol.geom.MultiPoint(coordinates));
+});
+map.requestRenderFrame();