diff --git a/js/ui/mxgraph/src/js/util/mxAnimation.js b/js/ui/mxgraph/src/js/util/mxAnimation.js
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+/**
+ * Copyright (c) 2006-2015, JGraph Ltd
+ * Copyright (c) 2006-2015, Gaudenz Alder
+ */
+/**
+ *
+ * Class: mxAnimation
+ * 
+ * Implements a basic animation in JavaScript.
+ * 
+ * Constructor: mxAnimation
+ * 
+ * Constructs an animation.
+ * 
+ * Parameters:
+ * 
+ * graph - Reference to the enclosing <mxGraph>.
+ */
+function mxAnimation(delay)
+{
+	this.delay = (delay != null) ? delay : 20;
+};
+
+/**
+ * Extends mxEventSource.
+ */
+mxAnimation.prototype = new mxEventSource();
+mxAnimation.prototype.constructor = mxAnimation;
+
+/**
+ * Variable: delay
+ * 
+ * Specifies the delay between the animation steps. Defaul is 30ms.
+ */
+mxAnimation.prototype.delay = null;
+
+/**
+ * Variable: thread
+ * 
+ * Reference to the thread while the animation is running.
+ */
+mxAnimation.prototype.thread = null;
+
+/**
+ * Function: isRunning
+ * 
+ * Returns true if the animation is running.
+ */
+mxAnimation.prototype.isRunning = function()
+{
+	return this.thread != null;
+};
+
+/**
+ * Function: startAnimation
+ *
+ * Starts the animation by repeatedly invoking updateAnimation.
+ */
+mxAnimation.prototype.startAnimation = function()
+{
+	if (this.thread == null)
+	{
+		this.thread = window.setInterval(mxUtils.bind(this, this.updateAnimation), this.delay);
+	}
+};
+
+/**
+ * Function: updateAnimation
+ *
+ * Hook for subclassers to implement the animation. Invoke stopAnimation
+ * when finished, startAnimation to resume. This is called whenever the
+ * timer fires and fires an mxEvent.EXECUTE event with no properties.
+ */
+mxAnimation.prototype.updateAnimation = function()
+{
+	this.fireEvent(new mxEventObject(mxEvent.EXECUTE));
+};
+
+/**
+ * Function: stopAnimation
+ *
+ * Stops the animation by deleting the timer and fires an <mxEvent.DONE>.
+ */
+mxAnimation.prototype.stopAnimation = function()
+{
+	if (this.thread != null)
+	{
+		window.clearInterval(this.thread);
+		this.thread = null;
+		this.fireEvent(new mxEventObject(mxEvent.DONE));
+	}
+};