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HxVectorR2.h

/*
 *  Copyright (c) 1999, University of Amsterdam, The Netherlands.
 *  All rights reserved.
 *
 *
 *  Author(s):
 *  Silvia D. Olabarriaga  (silvia@wins.uva.nl)
 *  Dennis Koelma (koelma@wins.uva.nl)
 */

#ifndef HxVectorR2_h
#define HxVectorR2_h

#include "HxIoFwd.h"
#include "HxVec2Double.h"
#include "HxScalarDouble.h"

class HxPointR2;

class HxVectorR2 {
public:
                    HxVectorR2();

                    HxVectorR2(double d1, double d2);

                    HxVectorR2(const HxPointR2& p1, const HxPointR2& p2);   


    double          x() const;

    double          y() const;

    HxVectorR2      add(const HxVectorR2& arg) const;

    HxVectorR2      sub(const HxVectorR2& arg) const;

    HxVectorR2      mul(double arg) const;

    HxVectorR2      div(double arg) const;

    double          dot(const HxVectorR2& arg) const;

    double          cross2D(const HxVectorR2& arg) const;

    double          magnitude() const;
    
    double          squaredMagnitude() const;

    HxVectorR2      normal() const; 

    STD_OSTREAM&    put(STD_OSTREAM&) const;

    STD_OSTREAM&    dump(HxVectorR2&) const;
    HxString        toString() const;

private:
    friend class HxPointR2;

    HxVec2Double    _data;
};


inline STD_OSTREAM&
operator<<(STD_OSTREAM& os, const HxVectorR2 v)
{
    return v.put(os);
}

inline
HxVectorR2::HxVectorR2() : _data(0,0)
{
}

inline
HxVectorR2::HxVectorR2(double d1, double d2) : _data(d1, d2)
{
}

inline double
HxVectorR2::x() const
{
    return _data.x();
}

inline double
HxVectorR2::y() const
{
    return _data.y();
}

inline HxVectorR2 
HxVectorR2::add(const HxVectorR2& arg) const
{
    return HxVectorR2( _data.x()+arg.x(), _data.y()+arg.y()); 
}

inline HxVectorR2 
HxVectorR2::sub(const HxVectorR2& arg) const
{
    return HxVectorR2( _data.x()-arg.x(), _data.y()-arg.y()); 
}

inline HxVectorR2 
HxVectorR2::mul(double arg) const
{
    return HxVectorR2( _data.x()*arg, _data.y()*arg); 
}

inline HxVectorR2 
HxVectorR2::div(double arg) const
{
    return HxVectorR2( _data.x()/arg, _data.y()/arg); 
}

inline double 
HxVectorR2::dot(const HxVectorR2& arg) const
{
    return _data.dot(arg._data).x();
}

inline double 
HxVectorR2::cross2D(const HxVectorR2& arg) const
{
    return _data.x()*arg.y() + _data.y()*arg.x();
}

inline double 
HxVectorR2::magnitude() const
{
    return _data.norm2().x();
}

inline double 
HxVectorR2::squaredMagnitude() const
{
    return _data.x()*_data.x() + _data.y()*_data.y();
}

inline HxVectorR2
HxVectorR2::normal() const
{
    return HxVectorR2(_data.y(), -_data.x()); 
}

inline HxString
HxVectorR2::toString() const
{
    return _data.toString();
}

inline STD_OSTREAM& 
HxVectorR2::put(STD_OSTREAM& os) const
{
    return os << _data;
}

inline HxString
makeString(const HxVectorR2& v)
{
    return v.toString();
}

#endif

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