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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_3.h $
// $Id: Direction_3.h 29078 2006-03-06 13:08:09Z spion $
//
//
// Author(s) : Andreas Fabri
#ifndef CGAL_CARTESIAN_DIRECTION_3_H
#define CGAL_CARTESIAN_DIRECTION_3_H
#include <CGAL/Threetuple.h>
#include <CGAL/Handle_for.h>
CGAL_BEGIN_NAMESPACE
template < class R_ >
class DirectionC3
{
typedef typename R_::FT FT;
typedef typename R_::Vector_3 Vector_3;
typedef typename R_::Line_3 Line_3;
typedef typename R_::Ray_3 Ray_3;
typedef typename R_::Segment_3 Segment_3;
typedef typename R_::Direction_3 Direction_3;
typedef typename R_::Aff_transformation_3 Aff_transformation_3;
typedef Threetuple<FT> Rep;
typedef typename R_::template Handle<Rep>::type Base;
Base base;
public:
typedef R_ R;
DirectionC3() {}
DirectionC3(const Vector_3 &v)
: base(v.x(), v.y(), v.z()) {}
// { *this = v.direction(); }
DirectionC3(const Line_3 &l)
{ *this = l.direction(); }
DirectionC3(const Ray_3 &r)
{ *this = r.direction(); }
DirectionC3(const Segment_3 &s)
{ *this = s.direction(); }
DirectionC3(const FT &x, const FT &y, const FT &z)
: base(x, y, z) {}
bool operator==(const DirectionC3 &d) const;
bool operator!=(const DirectionC3 &d) const;
Vector_3 to_vector() const;
Vector_3 vector() const { return to_vector(); }
Direction_3 transform(const Aff_transformation_3 &t) const
{
return t.transform(*this);
}
Direction_3 operator-() const;
const FT & delta(int i) const;
const FT & dx() const
{
return get(base).e0;
}
const FT & dy() const
{
return get(base).e1;
}
const FT & dz() const
{
return get(base).e2;
}
const FT & hdx() const
{
return dx();
}
const FT & hdy() const
{
return dy();
}
const FT & hdz() const
{
return dz();
}
FT hw() const
{
return FT(1);
}
};
template < class R >
inline
bool
DirectionC3<R>::operator==(const DirectionC3<R> &d) const
{
if (CGAL::identical(base, d.base))
return true;
return equal_directionC3(dx(), dy(), dz(), d.dx(), d.dy(), d.dz());
}
template < class R >
inline
bool
DirectionC3<R>::operator!=(const DirectionC3<R> &d) const
{
return !(*this == d);
}
template < class R >
inline
typename DirectionC3<R>::Vector_3
DirectionC3<R>::to_vector() const
{
return Vector_3(dx(), dy(), dz());
}
template < class R >
inline
typename DirectionC3<R>::Direction_3
DirectionC3<R>::operator-() const
{
return DirectionC3<R>(-dx(), -dy(), -dz());
}
template < class R >
const typename DirectionC3<R>::FT &
DirectionC3<R>::delta(int i) const
{
CGAL_kernel_precondition( i >= 0 && i <= 2 );
if (i==0) return dx();
if (i==1) return dy();
return dz();
}
#ifndef CGAL_NO_OSTREAM_INSERT_DIRECTIONC3
template < class R >
std::ostream &
operator<<(std::ostream &os, const DirectionC3<R> &d)
{
typename R::Vector_3 v = d.to_vector();
switch(os.iword(IO::mode)) {
case IO::ASCII :
return os << v.x() << ' ' << v.y() << ' ' << v.z();
case IO::BINARY :
write(os, v.x());
write(os, v.y());
write(os, v.z());
return os;
default:
os << "DirectionC3(" << v.x() << ", " << v.y() << ", " << v.z() << ")";
return os;
}
}
#endif // CGAL_NO_OSTREAM_INSERT_DIRECTIONC3
#ifndef CGAL_NO_ISTREAM_EXTRACT_DIRECTIONC3
template < class R >
std::istream &
operator>>(std::istream &is, DirectionC3<R> &d)
{
typename R::FT x, y, z;
switch(is.iword(IO::mode)) {
case IO::ASCII :
is >> x >> y >> z;
break;
case IO::BINARY :
read(is, x);
read(is, y);
read(is, z);
break;
default:
std::cerr << "" << std::endl;
std::cerr << "Stream must be in ascii or binary mode" << std::endl;
break;
}
if (is)
d = DirectionC3<R>(x, y, z);
return is;
}
#endif // CGAL_NO_ISTREAM_EXTRACT_DIRECTIONC3
CGAL_END_NAMESPACE
#endif // CGAL_CARTESIAN_DIRECTION_3_H
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