mechanicssimulation.h

/***************************************************************************
 *   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;


class Vector2D
{
public:
        Vector2D();
        
        double length() const;
        double lengthSquared() const { return x*x + y*y; }
        
        double x;
        double y;
};


class RigidBodyState
{
public:
        RigidBodyState();
        
        Vector2D linearMomentum;
        double angularMomentum;
        Vector2D position; // Position of center of mass
};
                

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;
};


class RigidBody
{
public:
        RigidBody( MechanicsDocument *mechanicsDocument );
        ~RigidBody();
        
        void advance( int phase, double delta );
        bool addMechanicsItem( MechanicsItem *item );
        MechanicsItem *overallParent() const { return p_overallParent; }
        void updateRigidBodyInfo();
        
protected:
        bool findOverallParent();
        void moveBy( double dx, double dy );
        void rotateBy( double dtheta );
        
        MechanicsItemList m_mechanicsItemList;
        MechanicsItem *p_overallParent;
        MechanicsDocument *p_mechanicsDocument;
        
        RigidBodyState m_rigidBodyState;
        double m_mass;
        double m_momentOfInertia;
};

#endif

---