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// Copyright (c) 1998-2021
// 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_3/include/CGAL/Distance_3/Line_3_Line_3.h $
// $Id: include/CGAL/Distance_3/Line_3_Line_3.h 08b27d3db14 $
// SPDX-License-Identifier: LGPL-3.0-or-later OR LicenseRef-Commercial
//
//
// Author(s) : Geert-Jan Giezeman, Andreas Fabri
#ifndef CGAL_DISTANCE_3_LINE_3_LINE_3_H
#define CGAL_DISTANCE_3_LINE_3_LINE_3_H
#include <CGAL/Distance_3/internal/squared_distance_utils_3.h>
#include <CGAL/Line_3.h>
namespace CGAL {
namespace internal {
template <class K>
typename K::FT
squared_distance(const typename K::Line_3& line1,
const typename K::Line_3& line2,
const K& k)
{
typedef typename K::Vector_3 Vector_3;
typename K::Construct_vector_3 vector = k.construct_vector_3_object();
const Vector_3 dir1 = line1.direction().vector();
const Vector_3 dir2 = line2.direction().vector();
const Vector_3 normal = wcross(dir1, dir2, k);
const Vector_3 diff = vector(line1.point(), line2.point());
if (is_null(normal, k))
return squared_distance_to_line(dir2, diff, k);
return squared_distance_to_plane(normal, diff, k);
}
template <class K>
typename K::Comparison_result
compare_squared_distance(const typename K::Line_3& line1,
const typename K::Line_3& line2,
const K& k,
const typename K::FT& d2)
{
return ::CGAL::compare(squared_distance(line1,line2,k),d2);
}
} // namespace internal
} // namespace CGAL
#endif // CGAL_DISTANCE_3_LINE_3_LINE_3_H
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