OgreVector2.h

Go to the documentation of this file.

/*
-----------------------------------------------------------------------------
This source file is part of OGRE
    (Object-oriented Graphics Rendering Engine)
For the latest info, see http://www.ogre3d.org/

Copyright (c) 2000-2005 The OGRE Team
Also see acknowledgements in Readme.html

This program is free software; you can redistribute it and/or modify it under
the terms of the GNU Lesser General Public License as published by the Free Software
Foundation; either version 2 of the License, or (at your option) any later
version.

This program is distributed in the hope that it will be useful, but WITHOUT
ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details.

You should have received a copy of the GNU Lesser General Public License along with
this program; if not, write to the Free Software Foundation, Inc., 59 Temple
Place - Suite 330, Boston, MA 02111-1307, USA, or go to
http://www.gnu.org/copyleft/lesser.txt.
-----------------------------------------------------------------------------
*/
#ifndef __Vector2_H__
#define __Vector2_H__


#include "OgrePrerequisites.h"
#include "OgreMath.h"

namespace Ogre
{

    class _OgreExport Vector2
    {
    public:
        union {
            struct {
                Real x, y;        
            };
            Real val[2];
        };

    public:
        inline Vector2()
        {
        }

        inline Vector2( Real fX, Real fY ) 
            : x( fX ), y( fY )
        {
        }

        inline Vector2( Real afCoordinate[2] )
            : x( afCoordinate[0] ),
              y( afCoordinate[1] )
        {
        }

        inline Vector2( int afCoordinate[2] )
        {
            x = (Real)afCoordinate[0];
            y = (Real)afCoordinate[1];
        }

        inline Vector2( const Real* const r )
            : x( r[0] ), y( r[1] )
        {
        }

        inline Vector2( const Vector2& rkVector )
            : x( rkVector.x ), y( rkVector.y )
        {
        }

        inline Real operator [] ( size_t i ) const
        {
            assert( i < 2 );

            return *(&x+i);
        }

        inline Real& operator [] ( size_t i )
        {
            assert( i < 2 );

            return *(&x+i);
        }

        inline Vector2& operator = ( const Vector2& rkVector )
        {
            x = rkVector.x;
            y = rkVector.y;        

            return *this;
        }

        inline bool operator == ( const Vector2& rkVector ) const
        {
            return ( x == rkVector.x && y == rkVector.y );
        }

        inline bool operator != ( const Vector2& rkVector ) const
        {
            return ( x != rkVector.x || y != rkVector.y  );
        }

        // arithmetic operations
        inline Vector2 operator + ( const Vector2& rkVector ) const
        {
            Vector2 kSum;

            kSum.x = x + rkVector.x;
            kSum.y = y + rkVector.y;

            return kSum;
        }

        inline Vector2 operator - ( const Vector2& rkVector ) const
        {
            Vector2 kDiff;

            kDiff.x = x - rkVector.x;
            kDiff.y = y - rkVector.y;

            return kDiff;
        }

        inline Vector2 operator * ( Real fScalar ) const
        {
            Vector2 kProd;

            kProd.x = fScalar*x;
            kProd.y = fScalar*y;

            return kProd;
        }

        inline Vector2 operator * ( const Vector2& rhs) const
        {
            Vector2 kProd;

            kProd.x = rhs.x * x;
            kProd.y = rhs.y * y;

            return kProd;
        }

        inline Vector2 operator / ( Real fScalar ) const
        {
            assert( fScalar != 0.0 );

            Vector2 kDiv;

            Real fInv = 1.0 / fScalar;
            kDiv.x = x * fInv;
            kDiv.y = y * fInv;

            return kDiv;
        }

        inline Vector2 operator - () const
        {
            Vector2 kNeg;

            kNeg.x = -x;
            kNeg.y = -y;

            return kNeg;
        }

        inline friend Vector2 operator * ( Real fScalar, const Vector2& rkVector )
        {
            Vector2 kProd;

            kProd.x = fScalar * rkVector.x;
            kProd.y = fScalar * rkVector.y;

            return kProd;
        }

        // arithmetic updates
        inline Vector2& operator += ( const Vector2& rkVector )
        {
            x += rkVector.x;
            y += rkVector.y;

            return *this;
        }

        inline Vector2& operator -= ( const Vector2& rkVector )
        {
            x -= rkVector.x;
            y -= rkVector.y;

            return *this;
        }

        inline Vector2& operator *= ( Real fScalar )
        {
            x *= fScalar;
            y *= fScalar;

            return *this;
        }

        inline Vector2& operator /= ( Real fScalar )
        {
            assert( fScalar != 0.0 );

            Real fInv = 1.0 / fScalar;

            x *= fInv;
            y *= fInv;

            return *this;
        }

        inline Real length () const
        {
            return Math::Sqrt( x * x + y * y );
        }

        inline Real squaredLength () const
        {
            return x * x + y * y;
        }

        inline Real dotProduct(const Vector2& vec) const
        {
            return x * vec.x + y * vec.y;
        }

        inline Real normalise()
        {
            Real fLength = Math::Sqrt( x * x + y * y);

            // Will also work for zero-sized vectors, but will change nothing
            if ( fLength > 1e-08 )
            {
                Real fInvLength = 1.0 / fLength;
                x *= fInvLength;
                y *= fInvLength;
            }

            return fLength;
        }

    
   
        inline Vector2 midPoint( const Vector2& vec ) const
        {
            return Vector2( 
                ( x + vec.x ) * 0.5, 
                ( y + vec.y ) * 0.5 );
        }

        inline bool operator < ( const Vector2& rhs ) const
        {
            if( x < rhs.x && y < rhs.y )
                return true;
            return false;
        }

        inline bool operator > ( const Vector2& rhs ) const
        {
            if( x > rhs.x && y > rhs.y )
                return true;
            return false;
        }

        inline void makeFloor( const Vector2& cmp )
        {
            if( cmp.x < x ) x = cmp.x;
            if( cmp.y < y ) y = cmp.y;
        }

        inline void makeCeil( const Vector2& cmp )
        {
            if( cmp.x > x ) x = cmp.x;
            if( cmp.y > y ) y = cmp.y;
        }

        inline Vector2 perpendicular(void) const
        {         
            return Vector2 (-y, x);
        }
        inline Vector2 crossProduct( const Vector2& rkVector ) const
        {
            return Vector2(-rkVector.y, rkVector.x);
        }
        inline Vector2 randomDeviant(
            Real angle) const
        {
           
            angle *=  Math::UnitRandom() * Math::TWO_PI;
            Real cosa = cos(angle);
            Real sina = sin(angle);
            return  Vector2(cosa * x - sina * y,
                            sina * x + cosa * y);
        }
        
        inline bool isZeroLength(void) const
        {
            Real sqlen = (x * x) + (y * y);
            return (sqlen < (1e-06 * 1e-06));

        }

        inline Vector2 normalisedCopy(void) const
        {
            Vector2 ret = *this;
            ret.normalise();
            return ret;
        }

        inline Vector2 reflect(const Vector2& normal) const
        {
            return Vector2( *this - ( 2 * this->dotProduct(normal) * normal ) );
        }

        // special points
        static const Vector2 ZERO;
        static const Vector2 UNIT_X;
        static const Vector2 UNIT_Y;
        static const Vector2 NEGATIVE_UNIT_X;
        static const Vector2 NEGATIVE_UNIT_Y;
        static const Vector2 UNIT_SCALE;

        inline _OgreExport friend std::ostream& operator <<
            ( std::ostream& o, const Vector2& v )
        {
            o << "Vector2(" << v.x << ", " << v.y <<  ")";
            return o;
        }
    };

}
#endif

---

Copyright © 2000-2005 by The OGRE Team

This work is licensed under a Creative Commons Attribution-ShareAlike 2.5 License.
Last modified Sun Feb 12 12:59:54 2006