Spring.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_SPRING_H
#define OPENCAL_SPRING_H

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

namespace OpenCAL
{
    // Forward declarations
    class PhysicalObject;

    class OPENCAL_API Spring: public Force
    {
    protected:
        // Member variables
        PhysicalObject *m_object1, *m_object2;
        float m_stiffness, m_damping;
        float m_restLength, m_snapFactor;

    public:
        // Constructors and destructor
        Spring(PhysicsSystem *parent, PhysicalObject *object1 = 0, PhysicalObject *object2 = 0);
        virtual ~Spring();

        // Get functions
        const PhysicalObject *getObject1() const { return m_object1; }
        PhysicalObject *getObject1() { return m_object1; }
        const PhysicalObject *getObject2() const { return m_object2; }
        PhysicalObject *getObject2() { return m_object2; }
        float getStiffness() const { return m_stiffness; }
        float getDamping() const { return m_damping; }
        float getRestLength() const { return m_restLength; }
        float getSnapFactor() const { return m_snapFactor; }
        bool doesSnap() { return (m_snapFactor > 1.0f); }
        bool isConnected() { return (m_object1 && m_object2); }

        // Set functions
        void setObject1(PhysicalObject *object) { m_object1 = object; }
        void setObject2(PhysicalObject *object) { m_object2 = object; }
        void setStiffness(float stiffness) { m_stiffness = stiffness; }
        void setDamping(float damping) { m_damping = damping; }
        void setRestLength(float restLength) { m_restLength = restLength; }
        void setSnapFactor(float snapFactor) { m_snapFactor = snapFactor; }
        void setNoSnap() { m_snapFactor = 0.0f; }

        // Execute functions
        void initialize();
        void execute(float seconds);

        // Render functions
        void render();

        // Other functions
        void connect(PhysicalObject *object1, PhysicalObject *object2) { m_object1 = object1; m_object2 = object2; }
        void calculateRestLength();
/*
#ifdef USE_OPENGL
        virtual void drawGL();
#endif // USE_OPENGL
*/
    };
}

#endif // OPENCAL_SPRING_H

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