wmlpolynomialcurve2.h

3D Game Engine Design Source Code非常棒

// Magic Software, Inc.
// http://www.magic-software.com
// http://www.wild-magic.com
// Copyright (c) 2003.  All Rights Reserved
//
// The Wild Magic Library (WML) source code is supplied under the terms of
// the license agreement http://www.magic-software.com/License/WildMagic.pdf
// and may not be copied or disclosed except in accordance with the terms of
// that agreement.

#ifndef WMLPOLYNOMIALCURVE2_H
#define WMLPOLYNOMIALCURVE2_H

#include "WmlPolynomial1.h"
#include "WmlSingleCurve2.h"

namespace Wml
{

template <class Real>
class WML_ITEM PolynomialCurve2 : public SingleCurve2<Real>
{
public:
    // Construction and destruction.  PolynomialCurve2 accepts responsibility
    // for deleting the input polynomials.
    PolynomialCurve2 (Polynomial1<Real>* pkXPoly, Polynomial1<Real>* pkYPoly);
    virtual ~PolynomialCurve2 ();

    int GetDegree () const;
    const Polynomial1<Real>* GetXPolynomial () const;
    const Polynomial1<Real>* GetYPolynomial () const;

    virtual Vector2<Real> GetPosition (Real fTime) const;
    virtual Vector2<Real> GetFirstDerivative (Real fTime) const;
    virtual Vector2<Real> GetSecondDerivative (Real fTime) const;
    virtual Vector2<Real> GetThirdDerivative (Real fTime) const;

    virtual Real GetVariation (Real fT0, Real fT1,
        const Vector2<Real>* pkP0 = NULL,
        const Vector2<Real>* pkP1 = NULL) const;

protected:
    Polynomial1<Real>* m_pkXPoly;
    Polynomial1<Real>* m_pkYPoly;
    Polynomial1<Real> m_kXDer1, m_kYDer1;
    Polynomial1<Real> m_kXDer2, m_kYDer2;
    Polynomial1<Real> m_kXDer3, m_kYDer3;
};

typedef PolynomialCurve2<float> PolynomialCurve2f;
typedef PolynomialCurve2<double> PolynomialCurve2d;

}

#endif