mgcellipse.h

3D Game Engine Design Source Code非常棒

// 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 MGCELLIPSE_H
#define MGCELLIPSE_H

#include "MgcMatrix2.h"


class MgcEllipseStandard
{
public:
    // (x/a)^2 + (y/b)^2 = 1

    MgcEllipseStandard ();

    MgcReal& Extent (int i);
    const MgcReal& Extent (int i) const;
    MgcReal* Extents ();
    const MgcReal* Extents () const;

protected:
    MgcReal m_afExtent[2];
};


class MgcEllipse
{
public:
    // center-matrix form, (X-C)^T A (X-C) = 1, where A is a positive
    // definite matrix

    MgcEllipse ();

    MgcVector2& Center ();
    const MgcVector2& Center () const;

    MgcMatrix2& A ();
    const MgcMatrix2& A () const;

protected:
    MgcVector2 m_kCenter;
    MgcMatrix2 m_kA;
};

#include "MgcEllipse.inl"

#endif