/*

* Copyright (c) 2009 Nokia Corporation and/or its subsidiary(-ies).

* All rights reserved.

* This component and the accompanying materials are made available

* under the terms of "Eclipse Public License v1.0"

* which accompanies this distribution, and is available

* at the URL "http://www.eclipse.org/legal/epl-v10.html".

*

* Initial Contributors:

* Nokia Corporation - initial contribution.

*

* Contributors:

*

* Description:    

*

*/

#ifndef HGVGSPRING_H_

#define HGVSPRING_H_

// INCLUDES

#include <e32base.h>

#include <e32std.h>

    NONSHARABLE_CLASS(THgVgSpring)

    {

        public:

            THgVgSpring(TReal aSpringK, TReal aSpringDamping, 

                TReal aSpringMaxVelocity, TReal aPositionSnap,

                TReal aVelocitySnap);

            void SetConstants(TReal aSpringK, TReal aSpringDamping, 

                TReal aSpringMaxVelocity, TReal aPositionSnap,

                TReal aVelocitySnap);

            void Reset();

            void Reset(TReal aX, TReal aY);

            void SetXY(TReal aX, TReal aY);

            void SetEnd(TReal aX, TReal aY);

            void SetVelocity(TReal aVx, TReal aVy);

            TBool IntegratePhysics(TReal aDeltaTime, TBool aEndCondition);            

            TReal GetX() const;

            TReal GetY() const;

            TReal GetInterpolatedX() const;

            TReal GetInterpolatedY() const;

            TReal VelX() const;

            TReal VelY() const;

            TReal EndX() const;

            TReal EndY() const;            

            TReal StartX() const;

            TReal StartY() const;

        private:

            TReal iPrevX, iPrevY;

            TReal iX, iY;

            TReal iEndX, iEndY;

            TReal iVelX, iVelY;

            TReal iAccumulator;

            TReal iSpringK;

            TReal iSpringDamping;

            TReal iMaxSpringVelocity;

            TReal iPositionSnap;

            TReal iVelocitySnap;

            TReal iStartX, iStartY;

        };

#endif /* HGVGSPRING_H */