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diff --git a/src/mechanics/mechanicssimulation.h b/src/mechanics/mechanicssimulation.h
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+/***************************************************************************
+ *   Copyright (C) 2005 by David Saxton                                    *
+ *   [email protected]                                                    *
+ *                                                                         *
+ *   This program is free software; you can redistribute it and/or modify  *
+ *   it under the terms of the GNU General Public License as published by  *
+ *   the Free Software Foundation; either version 2 of the License, or     *
+ *   (at your option) any later version.                                   *
+ ***************************************************************************/
+
+#ifndef MECHANICSSIMULATION_H
+#define MECHANICSSIMULATION_H
+
+#include <qguardedptr.h>
+#include <qobject.h>
+#include <qvaluelist.h>
+
+class MechanicsItem;
+class MechanicsDocument;
+typedef QValueList<MechanicsItem*> MechanicsItemList;
+
+
+/**
+@short 2 dimensional vector with associated length functions et al
+@author David Saxton
+*/
+class Vector2D
+{
+public:
+	Vector2D();
+	
+	double length() const;
+	double lengthSquared() const { return x*x + y*y; }
+	
+	double x;
+	double y;
+};
+
+
+/**
+@short State of a rigid body, in an inertial MechanicsDocument frame
+@author David Saxton
+*/
+class RigidBodyState
+{
+public:
+	RigidBodyState();
+	
+	Vector2D linearMomentum;
+	double angularMomentum;
+	Vector2D position; // Position of center of mass
+};
+		
+
+/**
+@author David Saxton
+*/
+class MechanicsSimulation : public QObject
+{
+Q_OBJECT
+public:
+    MechanicsSimulation( MechanicsDocument *mechanicsDocument );
+    ~MechanicsSimulation();
+	
+	MechanicsDocument* mechanicsDocument() const { return p_mechanicsDocument; }
+
+protected slots:
+	void slotAdvance();
+	
+protected:
+	QGuardedPtr<MechanicsDocument> p_mechanicsDocument;
+	QTimer *m_advanceTmr;
+};
+
+
+/**
+Rigid body with mass, inertia, etc. Collection of mechanics items with
+functionality for moving them about, rotating, etc. Only one mother-parent
+(has no parent itself, all other items are descendents) allowed.
+@short Rigid body, handles MechanicsItems
+@author David Saxton
+*/
+class RigidBody
+{
+public:
+	RigidBody( MechanicsDocument *mechanicsDocument );
+	~RigidBody();
+	
+	/**
+	 * 
+	 */
+	void advance( int phase, double delta );
+	/**
+	 * Add the MechanicsItem to the entity.
+	 * @returns true iff successful in adding
+	 */
+	bool addMechanicsItem( MechanicsItem *item );
+	/**
+	 * Pointer to the mother MechanicsItem.
+	 */
+	MechanicsItem *overallParent() const { return p_overallParent; }
+	/**
+	 * Updates the mass and the moment of inertia info
+	 */
+	void updateRigidBodyInfo();
+	
+protected:
+	/**
+	 * Attempt to find the overall parent.
+	 * @returns false iff unsucessful (including if there are no MechanicsItems present)
+	 */
+	bool findOverallParent();
+	/**
+	 * Move the set of MechanicsItems by the given amount
+	 */
+	void moveBy( double dx, double dy );
+	/**
+	 * Rotate the set of MechanicsItems by the given amount about the center of
+	 * mass.
+	 * @param angle Rotate amount in radians
+	 */
+	void rotateBy( double dtheta );
+	
+	MechanicsItemList m_mechanicsItemList;
+	MechanicsItem *p_overallParent;
+	MechanicsDocument *p_mechanicsDocument;
+	
+	RigidBodyState m_rigidBodyState;
+	double m_mass;
+	double m_momentOfInertia;
+};
+
+#endif