190 lines
6.9 KiB
C++
190 lines
6.9 KiB
C++
// 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/convex_hull_2.h $
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// $Id: convex_hull_2.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_CONVEX_HULL_2_H
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#define CGAL_CONVEX_HULL_2_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 <CGAL/convex_hull_traits_2.h>
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#include <CGAL/ch_akl_toussaint.h>
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#include <CGAL/ch_bykat.h>
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#include <iterator>
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namespace CGAL {
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template <class InputIterator, class OutputIterator, class Traits>
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inline
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OutputIterator
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CGAL_convex_hull_points_2(InputIterator first, InputIterator last,
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OutputIterator result,
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const Traits& ch_traits,
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std::input_iterator_tag )
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{ return ch_bykat(first, last, result, ch_traits); }
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template <class InputIterator, class OutputIterator, class Traits>
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inline
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OutputIterator
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CGAL_convex_hull_points_2(InputIterator first, InputIterator last,
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OutputIterator result,
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const Traits& ch_traits,
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std::forward_iterator_tag )
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{ return ch_akl_toussaint(first, last, result, ch_traits); }
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template <class InputIterator, class OutputIterator, class Traits>
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inline
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OutputIterator
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CGAL_convex_hull_points_2(InputIterator first, InputIterator last,
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OutputIterator result,
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const Traits& ch_traits,
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std::bidirectional_iterator_tag )
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{ return ch_akl_toussaint(first, last, result, ch_traits); }
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template <class InputIterator, class OutputIterator, class Traits>
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inline
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OutputIterator
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CGAL_convex_hull_points_2(InputIterator first, InputIterator last,
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OutputIterator result,
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const Traits& ch_traits,
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std::random_access_iterator_tag )
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{ return ch_akl_toussaint(first, last, result, ch_traits); }
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template <class InputIterator, class OutputIterator, class Traits>
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inline
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OutputIterator
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convex_hull_points_2(InputIterator first, InputIterator last,
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OutputIterator result,
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const Traits& ch_traits)
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{
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typedef std::iterator_traits<InputIterator> ITraits;
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typedef typename ITraits::iterator_category Category;
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return CGAL_convex_hull_points_2(first, last, result, ch_traits,
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Category());
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}
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template <class ForwardIterator, class OutputIterator>
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inline
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OutputIterator
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convex_hull_points_2(ForwardIterator first, ForwardIterator last,
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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 typename ITraits::iterator_category Category;
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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 CGAL_convex_hull_points_2(first, last, result, Kernel(),
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Category());
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}
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// generates the counterclockwise sequence of extreme points
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// of the points in the range [|first|,|last|). The resulting sequence
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// is placed starting at position |result|, and the past-the-end iterator
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// for the resulting sequence is returned. It is not specified, at which
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// point the cyclic sequence of extreme points is cut into a linear
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// sequence.
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// {\it Preconditions:}
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// [|first|,|last|) does not contain |result|.
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// {\sc traits}: operates on |Traits::Point_2| using |Traits::Less_xy_2|,
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// |Traits::Equal_2|, |Traits::Less_yx_2|, and |Traits::Left_turn_2|.
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template <class InputIterator, class OutputIterator, class Traits>
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inline
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OutputIterator
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convex_hull_2(InputIterator first, InputIterator last,
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OutputIterator result, const Traits& ch_traits)
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{
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return convex_hull_points_2(first, last, result, ch_traits);
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}
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template <class ForwardIterator, class OutputIterator>
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inline
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OutputIterator
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convex_hull_2(ForwardIterator first, ForwardIterator last,
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OutputIterator result )
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{
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return convex_hull_points_2(first, last, result);
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}
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// generates the counterclockwise sequence of extreme points
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// on the lower hull of the points in the range [|first|,|last|).
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// The resulting sequence is placed starting at position |result|,
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// and the past-the-end iterator for the resulting sequence is returned.
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// The sequence starts with the leftmost point, the rightmost point is
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// not included.
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// {\it Preconditions:}
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// [|first|,|last|) does not contain |result|.
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// {\sc traits}: operates on |Traits::Point_2| using |Traits::Less_xy_2|
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// |Traits::Equal_2| and |Traits::Left_turn_2|.
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template <class InputIterator, class OutputIterator, class Traits>
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inline
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OutputIterator
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lower_hull_points_2(InputIterator first, InputIterator last,
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OutputIterator result,
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const Traits& ch_traits)
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{ return ch_lower_hull_scan(first, last, result, 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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lower_hull_points_2(ForwardIterator first, ForwardIterator last,
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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 lower_hull_points_2(first, last, result, Kernel());
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}
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// generates the counterclockwise sequence of extreme points
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// on the upper hull of the points in the range [|first|,|last|).
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// The resulting sequence is placed starting at position |result|,
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// and the past-the-end iterator for the resulting sequence is returned.
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// The sequence starts with the rightmost point, the leftmost point is
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// not included.
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// {\it Preconditions:}
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// [|first|,|last|) does not contain |result|.
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// {\sc traits}: operates on |Traits::Point_2| using |Traits::Less_xy_2|,
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// |Traits::Equal_2| and |Traits::Left_turn_2|.
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template <class InputIterator, class OutputIterator, class Traits>
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inline
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OutputIterator
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upper_hull_points_2(InputIterator first, InputIterator last,
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OutputIterator result,
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const Traits& ch_traits)
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{ return ch_upper_hull_scan(first, last, result, 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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upper_hull_points_2(ForwardIterator first, ForwardIterator last,
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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 upper_hull_points_2(first, last, result, Kernel());
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}
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} //namespace CGAL
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#endif // CGAL_CONVEX_HULL_2_H
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