Add new ol.easing.elastic and ol.easing.bounce easing functions.

src/ol/easing.js

@@ -21,3 +21,40 @@ ol.easing.upAndDown = function(t) {
     return 1 - goog.fx.easing.inAndOut(2 * (t - 0.5));
   }
 };
+
+
+/**
+ * from https://raw.github.com/DmitryBaranovskiy/raphael/master/raphael.js
+ * @param {number} t Input between 0 and 1.
+ * @return {number} Output between 0 and 1.
+ */
+ol.easing.elastic = function(t) {
+  return Math.pow(2, -10 * t) * Math.sin((t - 0.075) * (2 * Math.PI) / 0.3) + 1;
+};
+
+
+/**
+ * from https://raw.github.com/DmitryBaranovskiy/raphael/master/raphael.js
+ * @param {number} t Input between 0 and 1.
+ * @return {number} Output between 0 and 1.
+ */
+ol.easing.bounce = function(t) {
+  var s = 7.5625, p = 2.75, l;
+  if (t < (1 / p)) {
+    l = s * t * t;
+  } else {
+    if (t < (2 / p)) {
+      t -= (1.5 / p);
+      l = s * t * t + 0.75;
+    } else {
+      if (t < (2.5 / p)) {
+        t -= (2.25 / p);
+        l = s * t * t + 0.9375;
+      } else {
+        t -= (2.625 / p);
+        l = s * t * t + 0.984375;
+      }
+    }
+  }
+  return l;
+};