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// Copyright (c) 1998-2004
// 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/Distance_2/include/CGAL/Distance_2/Ray_2_Line_2.h $
// $Id: include/CGAL/Distance_2/Ray_2_Line_2.h 08b27d3db14 $
// SPDX-License-Identifier: LGPL-3.0-or-later OR LicenseRef-Commercial
//
//
// Author(s) : Geert-Jan Giezeman
// Michel Hoffmann <hoffmann@inf.ethz.ch>
// Andreas Fabri <Andreas.Fabri@geometryfactory.com>
#ifndef CGAL_DISTANCE_2_RAY_2_LINE_2_H
#define CGAL_DISTANCE_2_RAY_2_LINE_2_H
#include <CGAL/Distance_2/internal/squared_distance_utils_2.h>
#include <CGAL/Line_2.h>
#include <CGAL/Ray_2.h>
namespace CGAL {
namespace internal {
template <class K>
typename K::FT
squared_distance(const typename K::Line_2& line,
const typename K::Ray_2& ray,
const K& k)
{
typedef typename K::FT FT;
typedef typename K::Vector_2 Vector_2;
typename K::Construct_vector_2 construct_vector = k.construct_vector_2_object();
Vector_2 normalvec(line.a(), line.b());
Vector_2 diff = construct_vector(line.point(), ray.source());
FT sign_dist = k.compute_scalar_product_2_object()(diff, normalvec);
if(sign_dist < FT(0))
{
if(is_acute_angle(normalvec, ray.direction().vector(), k))
return FT(0);
}
else
{
if(is_obtuse_angle(normalvec, ray.direction().vector(), k))
return FT(0);
}
return (square(sign_dist) / k.compute_squared_length_2_object()(normalvec));
}
template <class K>
inline typename K::FT
squared_distance(const typename K::Ray_2& ray,
const typename K::Line_2& line,
const K& k)
{
return internal::squared_distance(line, ray, k);
}
} // namespace internal
template <class K>
inline typename K::FT
squared_distance(const Line_2<K>& line,
const Ray_2<K>& ray)
{
return K().compute_squared_distance_2_object()(line, ray);
}
template <class K>
inline typename K::FT
squared_distance(const Ray_2<K>& ray,
const Line_2<K>& line)
{
return K().compute_squared_distance_2_object()(ray, line);
}
} // namespace CGAL
#endif // CGAL_DISTANCE_2_RAY_2_LINE_2_H
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