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+<!--
+@license
+Copyright (c) 2015 The Polymer Project Authors. All rights reserved.
+This code may only be used under the BSD style license found at http://polymer.github.io/LICENSE.txt
+The complete set of authors may be found at http://polymer.github.io/AUTHORS.txt
+The complete set of contributors may be found at http://polymer.github.io/CONTRIBUTORS.txt
+Code distributed by Google as part of the polymer project is also
+subject to an additional IP rights grant found at http://polymer.github.io/PATENTS.txt
+-->
+
+<link rel="import" href="../../polymer/polymer.html">
+<link rel="import" href="../neon-shared-element-animation-behavior.html">
+<link rel="import" href="../web-animations.html">
+
+<!--
+`<reverse-ripple-animation>` scales and transform an element such that it appears to ripple down from this element, to either
+a shared element, or a screen position.
+
+If using as a shared element animation in `<neon-animated-pages>`, use this animation in an `exit`
+animation in the source page and in an `entry` animation in the destination page. Also, define the
+reverse-ripple elements in the `sharedElements` property (not a configuration property, see
+`Polymer.NeonSharedElementAnimatableBehavior`).
+If using a screen position, define the `gesture` property.
+Configuration:
+```
+{
+  name: 'reverse-ripple-animation`.
+  id: <shared-element-id>, /* set this or gesture */
+  gesture: {x: <page-x>, y: <page-y>}, /* set this or id */
+  timing: <animation-timing>,
+  toPage: <node>, /* define for the destination page */
+  fromPage: <node>, /* define for the source page */
+}
+```
+-->
+
+<script>
+  Polymer({
+    is: 'reverse-ripple-animation',
+
+    behaviors: [
+      Polymer.NeonSharedElementAnimationBehavior
+    ],
+
+    configure: function(config) {
+      var shared = this.findSharedElements(config);
+      if (!shared) {
+        return null;
+      }
+
+      var translateX, translateY;
+      var fromRect = shared.from.getBoundingClientRect();
+      if (config.gesture) {
+        translateX = config.gesture.x - (fromRect.left + (fromRect.width / 2));
+        translateY = config.gesture.y - (fromRect.top + (fromRect.height / 2));
+      } else {
+        var toRect = shared.to.getBoundingClientRect();
+        translateX = (toRect.left + (toRect.width / 2)) - (fromRect.left + (fromRect.width / 2));
+        translateY = (toRect.top + (toRect.height / 2)) - (fromRect.top + (fromRect.height / 2));
+      }
+      var translate = 'translate(' + translateX + 'px,' + translateY + 'px)';
+
+      var size = Math.max(fromRect.width + Math.abs(translateX) * 2, fromRect.height + Math.abs(translateY) * 2);
+      var diameter = Math.sqrt(2 * size * size);
+      var scaleX = diameter / fromRect.width;
+      var scaleY = diameter / fromRect.height;
+      var scale = 'scale(' + scaleX + ',' + scaleY + ')';
+
+      this._effect = new KeyframeEffect(shared.from, [
+        {'transform': translate + ' ' + scale},
+        {'transform': translate + ' scale(0)'}
+      ], this.timingFromConfig(config));
+
+      this.setPrefixedProperty(shared.from, 'transformOrigin', '50% 50%');
+      shared.from.style.borderRadius = '50%';
+
+      return this._effect;
+    },
+
+    complete: function() {
+      if (this.sharedElements) {
+        this.setPrefixedProperty(this.sharedElements.from, 'transformOrigin', '');
+        this.sharedElements.from.style.borderRadius = '';
+      }
+    }
+  });
+</script>