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// Copyright (c) 1999
// 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/v6.1.1/Homogeneous_kernel/include/CGAL/Homogeneous/RayH3.h $
// $Id: include/CGAL/Homogeneous/RayH3.h 08b27d3db14 $
// SPDX-License-Identifier: LGPL-3.0-or-later OR LicenseRef-Commercial
//
//
// Author(s) : Stefan Schirra
#ifndef CGAL_RAYH3_H
#define CGAL_RAYH3_H
#include <utility>
#include <CGAL/kernel_config.h>
#include <CGAL/assertions.h>
#include <CGAL/Origin.h>
namespace CGAL {
template < class R_ >
class RayH3
{
typedef typename R_::FT FT;
typedef typename R_::Point_3 Point_3;
typedef typename R_::Line_3 Line_3;
typedef typename R_::Direction_3 Direction_3;
typedef typename R_::Vector_3 Vector_3;
typedef std::pair<Point_3, Vector_3> Rep;
typedef typename R_::template Handle<Rep>::type Base;
Base base;
public:
typedef R_ R;
RayH3() {}
RayH3( const Point_3& sp, const Point_3& secondp)
: base(sp, secondp-sp) {}
RayH3( const Point_3& sp, const Vector_3& v)
: base(sp, v) {}
RayH3( const Point_3& sp, const Direction_3& d)
: base(sp, d.to_vector()) {}
RayH3( const Point_3& sp, const Line_3& l)
: base(sp, l.to_vector()) {}
const Point_3 & start() const;
const Point_3 & source() const;
Point_3 second_point() const;
Point_3 point(const FT i) const;
Direction_3 direction() const;
const Vector_3 & to_vector() const;
Line_3 supporting_line() const;
RayH3<R> opposite() const;
typename R::Boolean has_on(const Point_3& p) const;
typename R::Boolean collinear_has_on(const Point_3 &p) const;
typename R::Boolean is_degenerate() const;
typename R::Boolean operator==(const RayH3<R>& r) const;
typename R::Boolean operator!=(const RayH3<R>& r) const;
};
template < class R >
inline
const typename RayH3<R>::Point_3 &
RayH3<R>::source() const
{ return get_pointee_or_identity(base).first; }
template < class R >
inline
const typename RayH3<R>::Point_3 &
RayH3<R>::start() const
{ return get_pointee_or_identity(base).first; }
template < class R >
inline
const typename RayH3<R>::Vector_3 &
RayH3<R>::to_vector() const
{
return get_pointee_or_identity(base).second;
}
template < class R >
inline
typename RayH3<R>::Direction_3
RayH3<R>::direction() const
{
return to_vector().direction();
}
template < class R >
CGAL_KERNEL_INLINE
typename RayH3<R>::Point_3
RayH3<R>::second_point() const
{ return start() + to_vector(); }
template < class R >
CGAL_KERNEL_INLINE
typename RayH3<R>::Point_3
RayH3<R>::point(const FT i) const
{
CGAL_kernel_precondition( i >= FT(0) );
if (i == FT(0)) return source();
return start() + i * to_vector();
}
template < class R >
CGAL_KERNEL_INLINE
typename RayH3<R>::Line_3
RayH3<R>::supporting_line() const
{
CGAL_kernel_precondition( !is_degenerate() );
return Line_3(start(), second_point() );
}
template < class R >
CGAL_KERNEL_INLINE
RayH3<R>
RayH3<R>::opposite() const
{ return RayH3<R>( start(), - direction() ); }
template < class R >
CGAL_KERNEL_INLINE
typename R::Boolean
RayH3<R>::has_on(const typename RayH3<R>::Point_3 &p) const
{
return ( ( p == start() )
||( Direction_3(p - start()) == direction() ) );
}
template < class R >
inline /* XXX */
typename R::Boolean
RayH3<R>::collinear_has_on(const typename RayH3<R>::Point_3 &p) const
{ return has_on(p); }
template < class R >
inline
typename R::Boolean
RayH3<R>::is_degenerate() const
{ return to_vector() == NULL_VECTOR; }
template < class R >
CGAL_KERNEL_INLINE
typename R::Boolean
RayH3<R>::operator==(const RayH3<R>& r) const
{ return ( (start() == r.start() )&&( direction() == r.direction() ) ); }
template < class R >
CGAL_KERNEL_INLINE
typename R::Boolean
RayH3<R>::operator!=( const RayH3<R>& r) const
{ return !operator==(r); }
} //namespace CGAL
#endif // CGAL_RAYH3_H
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