85 lines
2.8 KiB
C
85 lines
2.8 KiB
C
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// Copyright (c) 1999 Max-Planck-Institute Saarbruecken (Germany).
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// All rights reserved.
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//
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// This file is part of CGAL (www.cgal.org).
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//
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// $URL: https://github.com/CGAL/cgal/blob/v5.1/Convex_hull_2/include/CGAL/ch_jarvis.h $
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// $Id: ch_jarvis.h 0779373 2020-03-26T13:31:46+01:00 Sébastien Loriot
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// SPDX-License-Identifier: GPL-3.0-or-later OR LicenseRef-Commercial
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//
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//
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// Author(s) : Stefan Schirra
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#ifndef CGAL_CH_JARVIS_H
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#define CGAL_CH_JARVIS_H
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#include <CGAL/license/Convex_hull_2.h>
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#include <CGAL/basic.h>
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#include <iterator>
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namespace CGAL {
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// generates the counterclockwise ordered subsequence of
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// extreme points between |start_p| and |stop_p| of the points in the
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// range [|first|,|last|), starting at position result with point |start_p|.
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// The last point generated is the point preceding |stop_p| in the
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// counterclockwise order of extreme points.
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// {\it Precondition:} |start_p| and |stop_p| are extreme points with respect
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// to the points in the range [|first|,|last|) and |stop_p| is an element of
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// range [|first|,|last|).
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// {\sc traits}: uses |Traits::Point_2| $\equiv$ |Point|, |Traits::Equal_2|
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// and |Traits::Less_rotate_ccw_2|.
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template <class ForwardIterator, class OutputIterator,
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class Point, class Traits>
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OutputIterator
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ch_jarvis_march(ForwardIterator first, ForwardIterator last,
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const Point& start_p, const Point& stop_p,
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OutputIterator result,
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const Traits& ch_traits);
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template <class ForwardIterator, class OutputIterator, class Point>
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inline
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OutputIterator
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ch_jarvis_march(ForwardIterator first, ForwardIterator last,
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const Point& start_p,
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const Point& stop_p,
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OutputIterator result )
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{
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typedef CGAL::Kernel_traits<Point> KTraits;
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typedef typename KTraits::Kernel Kernel;
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return ch_jarvis_march( first, last, start_p, stop_p, result, Kernel());
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}
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// same as |convex_hull_2(first,last,result)|.
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// {\sc traits}: uses |Traits::Point_2|, |Traits::Less_rotate_ccw_2|,
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// |Traits::Equal_2| and |Traits::Less_xy_2|.
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template <class ForwardIterator, class OutputIterator, class Traits>
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OutputIterator
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ch_jarvis(ForwardIterator first, ForwardIterator last,
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OutputIterator result,
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const Traits& ch_traits);
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template <class ForwardIterator, class OutputIterator>
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inline
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OutputIterator
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ch_jarvis(ForwardIterator first, ForwardIterator last, OutputIterator result)
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{
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typedef std::iterator_traits<ForwardIterator> ITraits;
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typedef typename ITraits::value_type value_type;
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typedef CGAL::Kernel_traits<value_type> KTraits;
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typedef typename KTraits::Kernel Kernel;
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return ch_jarvis( first, last, result, Kernel());
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}
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} //namespace CGAL
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#include <CGAL/Convex_hull_2/ch_jarvis_impl.h>
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#endif // CGAL_CH_JARVIS_H
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