/usr/include/CGAL/Cartesian/Ray_3.h is in libcgal-dev 4.5-2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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// 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); 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; either version 3 of the License,
// or (at your option) any later version.
//
// 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.
//
// $URL$
// $Id$
//
//
// Author(s) : Andreas Fabri
#ifndef CGAL_CARTESIAN_RAY_3_H
#define CGAL_CARTESIAN_RAY_3_H
#include <CGAL/array.h>
#include <CGAL/Handle_for.h>
namespace CGAL {
template < class R_ >
class RayC3
{
typedef typename R_::FT FT;
typedef typename R_::Point_3 Point_3;
typedef typename R_::Direction_3 Direction_3;
typedef typename R_::Vector_3 Vector_3;
typedef typename R_::Line_3 Line_3;
typedef typename R_::Ray_3 Ray_3;
typedef cpp11::array<Point_3, 2> Rep;
typedef typename R_::template Handle<Rep>::type Base;
Base base;
public:
typedef R_ R;
RayC3() {}
RayC3(const Point_3 &sp, const Point_3 &secondp)
: base(CGAL::make_array(sp, secondp)) {}
RayC3(const Point_3 &sp, const Vector_3 &v)
: base(CGAL::make_array(sp, sp + v)) {}
RayC3(const Point_3 &sp, const Direction_3 &d)
: base(CGAL::make_array(sp, sp + d.to_vector())) {}
RayC3(const Point_3 &sp, const Line_3 &l)
: base(CGAL::make_array(sp, sp + l.to_vector())) {}
typename R::Boolean operator==(const RayC3 &r) const;
typename R::Boolean operator!=(const RayC3 &r) const;
const Point_3 & source() const
{
return get(base)[0];
}
const Point_3 & second_point() const
{
return get(base)[1];
}
Point_3 point(int i) const;
Direction_3 direction() const;
Vector_3 to_vector() const;
Line_3 supporting_line() const;
Ray_3 opposite() const;
typename R::Boolean is_degenerate() const;
typename R::Boolean has_on(const Point_3 &p) const;
typename R::Boolean collinear_has_on(const Point_3 &p) const;
};
template < class R >
inline
typename R::Boolean
RayC3<R>::operator==(const RayC3<R> &r) const
{
if (CGAL::identical(base, r.base))
return true;
return source() == r.source() && direction() == r.direction();
}
template < class R >
inline
typename R::Boolean
RayC3<R>::operator!=(const RayC3<R> &r) const
{
return !(*this == r);
}
template < class R >
CGAL_KERNEL_INLINE
typename RayC3<R>::Point_3
RayC3<R>::point(int i) const
{
CGAL_kernel_precondition( i >= 0 );
if (i == 0) return source();
if (i == 1) return second_point();
return source() + FT(i) * (second_point() - source());
}
template < class R >
inline
typename RayC3<R>::Vector_3
RayC3<R>::to_vector() const
{
return second_point() - source();
}
template < class R >
inline
typename RayC3<R>::Direction_3
RayC3<R>::direction() const
{
return Direction_3( second_point() - source() );
}
template < class R >
inline
typename RayC3<R>::Line_3
RayC3<R>::supporting_line() const
{
return Line_3(*this);
}
template < class R >
inline
typename RayC3<R>::Ray_3
RayC3<R>::opposite() const
{
return RayC3<R>( source(), - direction() );
}
template < class R >
typename R::Boolean
RayC3<R>::
has_on(const typename RayC3<R>::Point_3 &p) const
{
return (p == source()) ||
( collinear(source(), p, second_point())
&& ( Direction_3(p - source()) == direction() ));
}
template < class R >
inline
typename R::Boolean
RayC3<R>::is_degenerate() const
{
return source() == second_point();
}
template < class R >
inline
typename R::Boolean
RayC3<R>::
collinear_has_on(const typename RayC3<R>::Point_3 &p) const
{
CGAL_kernel_exactness_precondition( collinear(source(), p, second_point()) );
typename R::Comparison_result cx = compare_x(source(), second_point());
if (cx != EQUAL)
return cx != compare_x(p, source());
typename R::Comparison_result cy = compare_y(source(), second_point());
if (cy != EQUAL)
return cy != compare_y(p, source());
typename R::Comparison_result cz = compare_z(source(), second_point());
if (cz != EQUAL)
return cz != compare_z(p, source());
return true; // p == source()
}
} //namespace CGAL
#endif // CGAL_CARTESIAN_RAY_3_H
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