mgcvector2.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 MGCVECTOR2_H
#define MGCVECTOR2_H

#include "MgcMath.h"


class MgcVector2
{
public:
    // construction
    MgcVector2 ();
    MgcVector2 (MgcReal fX, MgcReal fY);
    MgcVector2 (MgcReal afCoordinate[2]);
    MgcVector2 (const MgcVector2& rkVector);

    // member access (allows V.x or V[0], V.y or V[1])
    MgcReal x, y;
    MgcReal& operator[] (int i) const;
    operator MgcReal* ();

    // assignment and comparison
    MgcVector2& operator= (const MgcVector2& rkVector);
    bool operator== (const MgcVector2& rkVector) const;
    bool operator!= (const MgcVector2& rkVector) const;

    // arithmetic operations
    MgcVector2 operator+ (const MgcVector2& rkVector) const;
    MgcVector2 operator- (const MgcVector2& rkVector) const;
    MgcVector2 operator* (MgcReal fScalar) const;
    MgcVector2 operator/ (MgcReal fScalar) const;
    MgcVector2 operator- () const;
    friend MgcVector2 operator* (MgcReal fScalar, const MgcVector2& rkVector);

    // arithmetic updates
    MgcVector2& operator+= (const MgcVector2& rkVector);
    MgcVector2& operator-= (const MgcVector2& rkVector);
    MgcVector2& operator*= (MgcReal fScalar);
    MgcVector2& operator/= (MgcReal fScalar);

    // vector operations
    MgcReal Length () const;
    MgcReal SquaredLength () const;
    MgcReal Dot (const MgcVector2& rkVector) const;
    MgcReal Unitize (MgcReal fTolerance = 1e-06);
    MgcVector2 Cross () const;
    MgcVector2 UnitCross () const;

    // Gram-Schmidt orthonormalization.
    static void Orthonormalize (MgcVector2 akVector[2]);

    // special points
    static const MgcVector2 ZERO;
    static const MgcVector2 UNIT_X;
    static const MgcVector2 UNIT_Y;
};

#endif