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diff --git a/src/sims/dynamics/Circle.scala b/src/sims/dynamics/Circle.scala
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+++ b/src/sims/dynamics/Circle.scala
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+/*
+ * Simple Mechanics Simulator (SiMS)
+ * copyright (c) 2009 Jakob Odersky
+ * made available under the MIT License
+*/
+
+package sims.dynamics
+
+import sims.geometry._
+import sims.collision._
+
+/**
+ * Circle ist die Definition eines Kreises.
+ * @param radius Radius dieses Kreises
+ * @param density Dichte dieses Kreises
+ */
+case class Circle(radius: Double,					// Radius
+                  density: Double) extends Shape{	// Dichte
+  
+  val volume = Math.Pi * radius * radius
+  
+  val I = mass * radius * radius / 2
+  
+  // AABB(Zentrum - Radius, Zentrum + Radius)
+  def AABB = new AABB(pos - Vector2D(radius,radius),
+                      pos + Vector2D(radius,radius))
+  
+  def project(axis: Vector2D) = if (axis.x != 0) Projection(axis,
+                                                            (pos.project(axis).x / axis.x) - radius,
+                                                            (pos.project(axis).x / axis.x) + radius)
+                                else Projection(axis,
+                                                (pos.project(axis).y / axis.y) - radius,
+                                                (pos.project(axis).y / axis.y) + radius)
+  
+  //Ist der gegebene punkt im Radius dieses kreises?
+  def contains(point: Vector2D) = (point - pos).length <= radius
+}