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diff --git a/src/js/util/mxRectangle.js b/src/js/util/mxRectangle.js
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+/**
+ * $Id: mxRectangle.js,v 1.17 2010-12-08 12:46:03 gaudenz Exp $
+ * Copyright (c) 2006-2010, JGraph Ltd
+ */
+/**
+ * Class: mxRectangle
+ *
+ * Extends <mxPoint> to implement a 2-dimensional rectangle with double
+ * precision coordinates.
+ * 
+ * Constructor: mxRectangle
+ *
+ * Constructs a new rectangle for the optional parameters. If no parameters
+ * are given then the respective default values are used.
+ */
+function mxRectangle(x, y, width, height)
+{
+	mxPoint.call(this, x, y);
+
+	this.width = (width != null) ? width : 0;
+	this.height = (height != null) ? height : 0;
+};
+
+/**
+ * Extends mxPoint.
+ */
+mxRectangle.prototype = new mxPoint();
+mxRectangle.prototype.constructor = mxRectangle;
+
+/**
+ * Variable: width
+ *
+ * Holds the width of the rectangle. Default is 0.
+ */
+mxRectangle.prototype.width = null;
+
+/**
+ * Variable: height
+ *
+ * Holds the height of the rectangle. Default is 0.
+ */
+mxRectangle.prototype.height = null;
+
+/**
+ * Function: setRect
+ * 
+ * Sets this rectangle to the specified values
+ */
+mxRectangle.prototype.setRect = function(x, y, w, h)
+{
+    this.x = x;
+    this.y = y;
+    this.width = w;
+    this.height = h;
+};
+
+/**
+ * Function: getCenterX
+ * 
+ * Returns the x-coordinate of the center point.
+ */
+mxRectangle.prototype.getCenterX = function ()
+{
+	return this.x + this.width/2;
+};
+
+/**
+ * Function: getCenterY
+ * 
+ * Returns the y-coordinate of the center point.
+ */
+mxRectangle.prototype.getCenterY = function ()
+{
+	return this.y + this.height/2;
+};
+
+/**
+ * Function: add
+ *
+ * Adds the given rectangle to this rectangle.
+ */
+mxRectangle.prototype.add = function(rect)
+{
+	if (rect != null)
+	{
+		var minX = Math.min(this.x, rect.x);
+		var minY = Math.min(this.y, rect.y);
+		var maxX = Math.max(this.x + this.width, rect.x + rect.width);
+		var maxY = Math.max(this.y + this.height, rect.y + rect.height);
+		
+		this.x = minX;
+		this.y = minY;
+		this.width = maxX - minX;
+		this.height = maxY - minY;
+	}
+};
+
+/**
+ * Function: grow
+ *
+ * Grows the rectangle by the given amount, that is, this method subtracts
+ * the given amount from the x- and y-coordinates and adds twice the amount
+ * to the width and height.
+ */
+mxRectangle.prototype.grow = function(amount)
+{
+	this.x -= amount;
+	this.y -= amount;
+	this.width += 2 * amount;
+	this.height += 2 * amount;
+};
+
+/**
+ * Function: getPoint
+ * 
+ * Returns the top, left corner as a new <mxPoint>.
+ */
+mxRectangle.prototype.getPoint = function()
+{
+	return new mxPoint(this.x, this.y);
+};
+
+/**
+ * Function: equals
+ * 
+ * Returns true if the given object equals this rectangle.
+ */
+mxRectangle.prototype.equals = function(obj)
+{
+	return obj.x == this.x &&
+		obj.y == this.y &&
+		obj.width == this.width &&
+		obj.height == this.height;
+};