// Copyright (c) 2003  INRIA Sophia-Antipolis (France).
// All rights reserved.
//
// This file is part of CGAL (www.cgal.org)
//
// $URL: https://github.com/CGAL/cgal/blob/v6.0.1/Intersections_3/include/CGAL/Intersections_3/internal/Ray_3_Sphere_3_do_intersect.h $
// $Id: include/CGAL/Intersections_3/internal/Ray_3_Sphere_3_do_intersect.h 50cfbde3b84 $
// SPDX-License-Identifier: LGPL-3.0-or-later OR LicenseRef-Commercial
//
//
// Author(s)     : Philippe Guigue

#ifndef CGAL_INTERNAL_INTERSECTIONS_RAY_3_SPHERE_3_DO_INTERSECT_H
#define CGAL_INTERNAL_INTERSECTIONS_RAY_3_SPHERE_3_DO_INTERSECT_H

#include <CGAL/Rational_traits.h>
#include <CGAL/Distance_3/Point_3_Ray_3.h>

namespace CGAL {
namespace Intersections {
namespace internal {

template <class K>
inline
typename K::Boolean
do_intersect(const typename K::Sphere_3& sp,
             const typename K::Ray_3& ray,
             const K& k)
{
  typedef typename K::RT RT;
  RT num, den;

  CGAL::internal::squared_distance_RT(sp.center(), ray, num, den, k);
  return !(compare_quotients<RT>(num, den,
                                 Rational_traits<typename K::FT>().numerator(sp.squared_radius()),
                                 Rational_traits<typename K::FT>().denominator(sp.squared_radius())) == LARGER);
}

template <class K>
inline
typename K::Boolean
do_intersect(const typename K::Ray_3& ray,
             const typename K::Sphere_3& sp,
             const K& k)
{
  return do_intersect(sp, ray, k);
}

} // namespace internal
} // namespace Intersections
} // namespace CGAL

#endif // CGAL_INTERNAL_INTERSECTIONS_RAY_3_SPHERE_3_DO_INTERSECT_H

