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// Copyright (c) 1999 Max-Planck-Institute Saarbruecken (Germany).
// All rights reserved.
//
// This file is part of CGAL (www.cgal.org).
//
// $URL: https://github.com/CGAL/cgal/blob/v6.1/Convex_hull_2/include/CGAL/ch_jarvis.h $
// $Id: include/CGAL/ch_jarvis.h b26b07a1242 $
// SPDX-License-Identifier: GPL-3.0-or-later OR LicenseRef-Commercial
//
//
// Author(s) : Stefan Schirra
#ifndef CGAL_CH_JARVIS_H
#define CGAL_CH_JARVIS_H
#include <CGAL/license/Convex_hull_2.h>
#include <CGAL/basic.h>
#include <iterator>
namespace CGAL {
// generates the counterclockwise ordered subsequence of
// extreme points between |start_p| and |stop_p| of the points in the
// range [|first|,|last|), starting at position result with point |start_p|.
// The last point generated is the point preceding |stop_p| in the
// counterclockwise order of extreme points.
// {\it Precondition:} |start_p| and |stop_p| are extreme points with respect
// to the points in the range [|first|,|last|) and |stop_p| is an element of
// range [|first|,|last|).
// {\sc traits}: uses |Traits::Point_2| $\equiv$ |Point|, |Traits::Equal_2|
// and |Traits::Less_rotate_ccw_2|.
template <class ForwardIterator, class OutputIterator,
class Point, class Traits>
OutputIterator
ch_jarvis_march(ForwardIterator first, ForwardIterator last,
const Point& start_p, const Point& stop_p,
OutputIterator result,
const Traits& ch_traits);
template <class ForwardIterator, class OutputIterator, class Point>
inline
OutputIterator
ch_jarvis_march(ForwardIterator first, ForwardIterator last,
const Point& start_p,
const Point& stop_p,
OutputIterator result )
{
typedef CGAL::Kernel_traits<Point> KTraits;
typedef typename KTraits::Kernel Kernel;
return ch_jarvis_march( first, last, start_p, stop_p, result, Kernel());
}
// same as |convex_hull_2(first,last,result)|.
// {\sc traits}: uses |Traits::Point_2|, |Traits::Less_rotate_ccw_2|,
// |Traits::Equal_2| and |Traits::Less_xy_2|.
template <class ForwardIterator, class OutputIterator, class Traits>
OutputIterator
ch_jarvis(ForwardIterator first, ForwardIterator last,
OutputIterator result,
const Traits& ch_traits);
template <class ForwardIterator, class OutputIterator>
inline
OutputIterator
ch_jarvis(ForwardIterator first, ForwardIterator last, OutputIterator result)
{
typedef std::iterator_traits<ForwardIterator> ITraits;
typedef typename ITraits::value_type value_type;
typedef CGAL::Kernel_traits<value_type> KTraits;
typedef typename KTraits::Kernel Kernel;
return ch_jarvis( first, last, result, Kernel());
}
} //namespace CGAL
#include <CGAL/Convex_hull_2/ch_jarvis_impl.h>
#endif // CGAL_CH_JARVIS_H
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