mgcnaturalspline2.h

《3D游戏引擎设计》的源码

// Magic Software, Inc.
// http://www.magic-software.com
// Copyright (c) 2000, All Rights Reserved
//
// Source code from Magic Software is supplied under the terms of a license
// agreement and may not be copied or disclosed except in accordance with the
// terms of that agreement.  The various license agreements may be found at
// the Magic Software web site.  This file is subject to the license
//
// FREE SOURCE CODE
// http://www.magic-software.com/License/free.pdf

#ifndef MGCNATURALSPLINE2_H
#define MGCNATURALSPLINE2_H

#include "MgcMultipleCurve2.h"


class MgcNaturalSpline2 : public MgcMultipleCurve2
{
public:
    enum BoundaryType
    {
        BT_FREE,
        BT_CLAMPED,
        BT_CLOSED
    };

    MgcNaturalSpline2 (BoundaryType eType, int iSegments, MgcReal* afTime,
        MgcVector2* akPoint);

    virtual ~MgcNaturalSpline2 ();

    const MgcVector2* GetPoints () const;

    virtual MgcVector2 GetPosition (MgcReal fTime) const;
    virtual MgcVector2 GetFirstDerivative (MgcReal fTime) const;
    virtual MgcVector2 GetSecondDerivative (MgcReal fTime) const;
    virtual MgcVector2 GetThirdDerivative (MgcReal fTime) const;

protected:
    void CreateFreeSpline ();
    void CreateClampedSpline ();
    void CreateClosedSpline ();

    virtual MgcReal GetSpeed (int iKey, MgcReal fTime) const;
    virtual MgcReal GetLength (int iKey, MgcReal fT0, MgcReal fT1) const;
    virtual MgcReal GetVariation (int iKey, MgcReal fT0, MgcReal fT1,
        const MgcVector2& rkA, const MgcVector2& rkB) const;

    MgcVector2* m_akA;
    MgcVector2* m_akB;
    MgcVector2* m_akC;
    MgcVector2* m_akD;
};

#include "MgcNaturalSpline2.inl"

#endif