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// Copyright (c) 2000 Utrecht University (The Netherlands),
// ETH Zurich (Switzerland), Freie Universitaet Berlin (Germany),
// INRIA Sophia-Antipolis (France), Martin-Luther-University Halle-Wittenberg
// (Germany), Max-Planck-Institute Saarbruecken (Germany), RISC Linz (Austria),
// and Tel-Aviv University (Israel). All rights reserved.
//
// This file is part of CGAL (www.cgal.org); 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; version 2.1 of the License.
// See the file LICENSE.LGPL distributed with CGAL.
//
// Licensees holding a valid commercial license may use this file in
// accordance with the commercial license agreement provided with the software.
//
// This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
// WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
//
// $URL: svn+ssh://scm.gforge.inria.fr/svn/cgal/branches/CGAL-3.2-branch/Cartesian_kernel/include/CGAL/Cartesian/Direction_2.h $
// $Id: Direction_2.h 29078 2006-03-06 13:08:09Z spion $
//
//
// Author(s) : Andreas Fabri, Herve Bronnimann
#ifndef CGAL_CARTESIAN_DIRECTION_2_H
#define CGAL_CARTESIAN_DIRECTION_2_H
#include <CGAL/Twotuple.h>
#include <CGAL/Handle_for.h>
CGAL_BEGIN_NAMESPACE
template < class R_ >
class DirectionC2
{
typedef DirectionC2<R_> Self;
typedef typename R_::FT FT;
typedef FT RT;
typedef typename R_::Point_2 Point_2;
typedef typename R_::Vector_2 Vector_2;
typedef typename R_::Line_2 Line_2;
typedef typename R_::Ray_2 Ray_2;
typedef typename R_::Segment_2 Segment_2;
typedef typename R_::Direction_2 Direction_2;
typedef typename R_::Aff_transformation_2 Aff_transformation_2;
typedef Twotuple<FT> Rep;
typedef typename R_::template Handle<Rep>::type Base;
Base base;
public:
typedef R_ R;
DirectionC2() {}
DirectionC2(const FT &x, const FT &y)
: base(x, y) {}
bool operator==(const DirectionC2 &d) const;
bool operator!=(const DirectionC2 &d) const;
Vector_2 to_vector() const;
Direction_2 transform(const Aff_transformation_2 &t) const
{
return t.transform(*this);
}
const RT & dx() const
{
return get(base).e0;
}
const RT & dy() const
{
return get(base).e1;
}
};
template < class R >
inline
bool
DirectionC2<R>::operator==(const DirectionC2<R> &d) const
{
if (CGAL::identical(base, d.base))
return true;
return equal_direction(*this, d);
}
template < class R >
inline
bool
DirectionC2<R>::operator!=(const DirectionC2<R> &d) const
{
return !( *this == d );
}
template < class R >
inline
typename DirectionC2<R>::Vector_2
DirectionC2<R>::to_vector() const
{
return Vector_2(dx(), dy());
}
#ifndef CGAL_NO_OSTREAM_INSERT_DIRECTIONC2
template < class R >
std::ostream&
operator<<(std::ostream &os, const DirectionC2<R> &d)
{
typename R::Vector_2 v = d.to_vector();
switch(os.iword(IO::mode)) {
case IO::ASCII :
return os << v.x() << ' ' << v.y();
case IO::BINARY :
write(os, v.x());
write(os, v.y());
return os;
default:
return os << "DirectionC2(" << v.x() << ", " << v.y() << ')';
}
}
#endif // CGAL_NO_OSTREAM_INSERT_DIRECTIONC2
#ifndef CGAL_NO_ISTREAM_EXTRACT_DIRECTIONC2
template < class R >
std::istream&
operator>>(std::istream &is, DirectionC2<R> &p)
{
typename R::FT x, y;
switch(is.iword(IO::mode)) {
case IO::ASCII :
is >> x >> y;
break;
case IO::BINARY :
read(is, x);
read(is, y);
break;
default:
std::cerr << std::endl << "Stream must be in ascii or binary mode"
<< std::endl;
break;
}
if (is)
p = DirectionC2<R>(x, y);
return is;
}
#endif // CGAL_NO_ISTREAM_EXTRACT_DIRECTIONC2
CGAL_END_NAMESPACE
#endif // CGAL_CARTESIAN_DIRECTION_2_H
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