85 lines
2.8 KiB
C++
85 lines
2.8 KiB
C++
// 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/v5.1/Convex_hull_2/include/CGAL/ch_jarvis.h $
|
|
// $Id: ch_jarvis.h 0779373 2020-03-26T13:31:46+01:00 Sébastien Loriot
|
|
// 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
|