1 /*

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

     3 * All rights reserved.

     4 * This component and the accompanying materials are made available

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

     6 * which accompanies this distribution, and is available

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

     8 *

     9 * Initial Contributors:

    10 * Nokia Corporation - initial contribution.

    11 *

    12 * Contributors:

    13 *

    14 * Description:    

    15 *

    16 */

    17 

    18 #ifndef HGVGSPRING_H_

    19 #define HGVSPRING_H_

    20 

    21 // INCLUDES

    22 #include <e32base.h>

    23 #include <e32std.h>

    24 

    25 

    26     NONSHARABLE_CLASS(THgVgSpring)

    27     {

    28         public:

    29                                 

    30             THgVgSpring(TReal aSpringK, TReal aSpringDamping, 

    31                 TReal aSpringMaxVelocity, TReal aPositionSnap,

    32                 TReal aVelocitySnap);

    33 

    34             void SetConstants(TReal aSpringK, TReal aSpringDamping, 

    35                 TReal aSpringMaxVelocity, TReal aPositionSnap,

    36                 TReal aVelocitySnap);

    37 

    38             void Reset();

    39             void Reset(TReal aX, TReal aY);

    40             void SetXY(TReal aX, TReal aY);

    41             void SetEnd(TReal aX, TReal aY);

    42             void SetVelocity(TReal aVx, TReal aVy);

    43             TBool IntegratePhysics(TReal aDeltaTime, TBool aEndCondition);            

    44             TReal GetX() const;

    45             TReal GetY() const;

    46             TReal GetInterpolatedX() const;

    47             TReal GetInterpolatedY() const;

    48             TReal VelX() const;

    49             TReal VelY() const;

    50             TReal EndX() const;

    51             TReal EndY() const;

    52     

    53         private:

    54                         

    55             TReal iPrevX, iPrevY;

    56             TReal iX, iY;

    57             TReal iEndX, iEndY;

    58             TReal iVelX, iVelY;

    59             TReal iAccumulator;

    60             TReal iSpringK;

    61             TReal iSpringDamping;

    62             TReal iMaxSpringVelocity;

    63             TReal iPositionSnap;

    64             TReal iVelocitySnap;

    65         };

    66 

    67 

    68 #endif /* HGVGSPRING_H */