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+/***************************************************************************
+ * Copyright (C) 2005 by David Saxton *
+ * david@bluehaze.org *
+ * *
+ * 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