Physical.h

/***************************************************************************
 *   This file is part of OpenCAL: Open Computer Animation Library         *
 *   I created OpenCAL as my master's thesis Computer Science (multimedia) *
 *   at the tUL university in Diepenbeek, Belgium                          *
 *                                                                         *
 *   Copyright (C) 2003-2004 by Jeroen Dierckx                             *
 *   jeroen.dierckx@student.luc.ac.be                                      *
 *                                                                         *
 ***************************************************************************/

#ifndef OPENCAL_PHYSICAL_H
#define OPENCAL_PHYSICAL_H

// Includes
#include <OpenCAL/global.h>

#include <OpenCAL/Vector3.h>
using OpenCAL::Utils::Vector3;


namespace OpenCAL
{
    // Forward declarations

    class OPENCAL_API Physical
    {
    protected:
        // Member variables
        mutable Vector3 m_velocity, m_force;
        float m_oneOverMass;

    public:
        // Destructor
        virtual ~Physical();

        // Get functions
        virtual const Vector3 &getVelocity() const { return m_velocity; }
        virtual Vector3 *getVelocityP() { return &m_velocity; }
        Vector3 getMomentum() const { return m_velocity * getMass(); }
        const Vector3 &getForce() const { return m_force; }
        Vector3 *getForceP() { return &m_force; }
        Vector3 getAccelleration() const { return m_force * m_oneOverMass; }
        float getMass() const;
        float getOneOverMass() const { return m_oneOverMass; }
        bool hasInfiniteMass() const { return m_oneOverMass == 0.0f; }

        // Set functions
        void setVelocity(const Vector3 &velocity) { m_velocity = velocity; }
        void setForce(const Vector3 &force) { m_force = force; }
        virtual void addForce(const Vector3 &force) { m_force += force; }
        void resetForce() { m_force = Vector3::zero; }
        void setAccelleration(const Vector3 &accelleration);
        void setMass(float mass);
        void setOneOverMass(float oneOverMass) { m_oneOverMass = oneOverMass; }
        void setInfiniteMass() { m_oneOverMass = 0.0f; }
        //void fix() { m_oneOverMass = 0.0f; m_velocity = m_force = Vector3::zero; }

    protected:
        // Constructor is protected, so no instance of this base class can be made
        Physical(float mass = 1.0);
    };
}

#endif // OPENCAL_PHYSICAL_H

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