Gravity.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_GRAVITY_H
#define OPENCAL_GRAVITY_H

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

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


namespace OpenCAL
{
    // Forward declarations
    class PhysicsSystem;

    class OPENCAL_API Gravity: public Force
    {
    protected:
        // Member variables
        Vector3 m_gravity;

    public:
        // Constructors and destructor
        Gravity(PhysicsSystem *parent, const Vector3 &gravity = Vector3(0.0f, -9.81f, 0.0f));
        Gravity(PhysicsSystem *parent, float downGravity);
        virtual ~Gravity();

        // Get functions
        const Vector3 &getGravity() const { return m_gravity; }
        float getDownGravity() const { return -m_gravity.getY(); }

        // Set functions
        void setGravity(const Vector3 &gravity) { m_gravity = gravity; }
        void setGravity(float downGravity) { m_gravity = Vector3(0, -downGravity, 0); }

        // Other functions
        void execute(float seconds);
    };
}

#endif // OPENCAL_GRAVITY_H

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