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// Copyright (c) 2000
// Utrecht University (The Netherlands),
// ETH Zurich (Switzerland),
// INRIA Sophia-Antipolis (France),
// Max-Planck-Institute Saarbruecken (Germany),
// and Tel-Aviv University (Israel). All rights reserved.
//
// This file is part of CGAL (www.cgal.org)
//
// $URL: https://github.com/CGAL/cgal/blob/v6.1/Cartesian_kernel/include/CGAL/Cartesian/Direction_3.h $
// $Id: include/CGAL/Cartesian/Direction_3.h b26b07a1242 $
// SPDX-License-Identifier: LGPL-3.0-or-later OR LicenseRef-Commercial
//
//
// Author(s) : Andreas Fabri
#ifndef CGAL_CARTESIAN_DIRECTION_3_H
#define CGAL_CARTESIAN_DIRECTION_3_H
#include <CGAL/array.h>
#include <CGAL/Handle_for.h>
#include <CGAL/predicates/kernel_ftC3.h>
namespace CGAL {
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 std::array<FT, 3> Rep;
typedef typename R_::template Handle<Rep>::type Base;
Base base;
public:
typedef R_ R;
DirectionC3() {}
explicit DirectionC3(const Vector_3 &v)
: base{v.x(), v.y(), v.z()} {}
// { *this = v.direction(); }
explicit DirectionC3(const Line_3 &l)
{ *this = l.rep().direction(); }
explicit DirectionC3(const Ray_3 &r)
{ *this = r.rep().direction(); }
explicit DirectionC3(const Segment_3 &s)
{ *this = s.rep().direction(); }
DirectionC3(const FT &x, const FT &y, const FT &z)
: base{x, y, z} {}
typename R::Boolean operator==(const DirectionC3 &d) const;
typename R::Boolean operator!=(const DirectionC3 &d) const;
Vector_3 to_vector() const;
Vector_3 vector() const { return to_vector(); }
const FT & dx() const
{
return get_pointee_or_identity(base)[0];
}
const FT & dy() const
{
return get_pointee_or_identity(base)[1];
}
const FT & dz() const
{
return get_pointee_or_identity(base)[2];
}
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
typename R::Boolean
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
typename R::Boolean
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());
}
} //namespace CGAL
#endif // CGAL_CARTESIAN_DIRECTION_3_H
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