diff --git a/src/basic/Point.js b/src/basic/Point.js
index b5f5d7cf..969eda4e 100644
--- a/src/basic/Point.js
+++ b/src/basic/Point.js
@@ -33,6 +33,11 @@ var Point = Base.extend({
 		}
 	},
 
+	set: function(x, y) {
+		this.x = x;
+		this.y = y;
+	},
+
 	/**
 	 * Returns a copy of the point.
 	 * This is useful as the following code only generates a flat copy:
diff --git a/src/basic/Rectangle.js b/src/basic/Rectangle.js
index c4f6a985..35444ed7 100644
--- a/src/basic/Rectangle.js
+++ b/src/basic/Rectangle.js
@@ -46,6 +46,13 @@ Rectangle = Base.extend({
 		}
 	},
 
+	set: function(x, y, width, height) {
+		this.x = x;
+		this.y = y;
+		this.width = width;
+		this.height = height;
+	},
+
 	getPoint: function() {
 		return new Point(this.x, this.y);
 	},
diff --git a/src/basic/Size.js b/src/basic/Size.js
index 5ebd58bb..dae7c3fe 100644
--- a/src/basic/Size.js
+++ b/src/basic/Size.js
@@ -26,6 +26,11 @@ var Size = Base.extend({
 		}
 	},
 
+	set: function(width, height) {
+		this.width = width;
+		this.height = height;
+	},
+
 	add: function() {
 		var size = Size.read(arguments);
 		return new Size(this.width + size.width, this.height + size.height);