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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/Distance_2/include/CGAL/Distance_2/Line_2_Triangle_2.h $
// $Id: include/CGAL/Distance_2/Line_2_Triangle_2.h b26b07a1242 $
// 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_LINE_2_TRIANGLE_2_H
#define CGAL_DISTANCE_2_LINE_2_TRIANGLE_2_H
#include <CGAL/Distance_2/internal/squared_distance_utils_2.h>
#include <CGAL/enum.h>
#include <CGAL/Line_2.h>
#include <CGAL/Triangle_2.h>
namespace CGAL {
namespace internal {
template <class K>
typename K::FT
squared_distance(const typename K::Line_2& line,
const typename K::Triangle_2& triangle,
const K& k)
{
typedef typename K::FT FT;
typename K::Compute_squared_distance_2 sq_dist = k.compute_squared_distance_2_object();
const Oriented_side side0 = line.oriented_side(triangle.vertex(0));
if(line.oriented_side(triangle.vertex(1)) != side0)
return FT(0);
if(line.oriented_side(triangle.vertex(2)) != side0)
return FT(0);
FT mindist = sq_dist(triangle.vertex(0), line);
for(int i=1; i<3; ++i)
{
FT dist = sq_dist(triangle.vertex(i), line);
if(dist < mindist)
mindist = dist;
}
return mindist;
}
template <class K>
inline typename K::FT
squared_distance(const typename K::Triangle_2& triangle,
const typename K::Line_2& line,
const K& k)
{
return internal::squared_distance(line, triangle, k);
}
} // namespace internal
template <class K>
inline typename K::FT
squared_distance(const Line_2<K>& line,
const Triangle_2<K>& triangle)
{
return K().compute_squared_distance_2_object()(line, triangle);
}
template <class K>
inline typename K::FT
squared_distance(const Triangle_2<K>& triangle,
const Line_2<K>& line)
{
return K().compute_squared_distance_2_object()(triangle, line);
}
} // namespace CGAL
#endif // CGAL_DISTANCE_2_LINE_2_TRIANGLE_2_H
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