101 lines
3.3 KiB
C
101 lines
3.3 KiB
C
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// Copyright (c) 1998 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/segment_intersection_points_2.h $
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// $Id: segment_intersection_points_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_SEGMENT_INTERSECTION_POINTS_2_H
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#define CGAL_SEGMENT_INTERSECTION_POINTS_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/algorithm.h>
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#include <iterator>
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namespace CGAL {
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/*
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#include <CGAL/Intersections_2/Segment_2_Segment_2.h>
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template <class ForwardIterator, class OutputIterator, class R>
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OutputIterator
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si_brute_force(ForwardIterator first, ForwardIterator last,
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OutputIterator result,
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const R& )
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{
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typedef Point_2<R> Point;
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ForwardIterator inner, outer;
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Object i_obj;
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Point p;
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for ( outer = first; outer != last; ++outer)
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for ( inner = successor(outer); inner != last; ++inner)
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{
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i_obj = intersection( *outer, *inner);
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if ( assign( p, i_obj) )
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result++ = p;
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}
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return result;
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}
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*/
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template <class ForwardIterator, class OutputIterator, class Traits>
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OutputIterator
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si_brute_force_II(ForwardIterator first, ForwardIterator last,
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OutputIterator result,
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const Traits& traits)
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{
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typedef typename Traits::Point_2 Point;
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typedef typename Traits::Line_2 Line;
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typedef typename Traits::Orientation_2 Orientation;
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Orientation orientation = traits.orientation_2_object();
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for ( ForwardIterator outer = first; outer != last; ++outer)
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for ( ForwardIterator inner = std::next(outer); inner != last; ++inner)
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{
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Point s1 = (*outer).source();
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Point e1 = (*outer).target();
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Point s2 = (*inner).source();
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Point e2 = (*inner).target();
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if ( (orientation( s1, e1, s2) != orientation( s1, e1, e2))
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&&(orientation( s2, e2, s1) != orientation( s2, e2, e1)))
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{
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Line l1( s1, e1);
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Line l2( s2, e2);
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result++ = Point( l1.b()*l2.c() - l2.b()*l1.c(),
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l2.a()*l1.c() - l1.a()*l2.c(),
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l1.a()*l2.b() - l2.a()*l1.b());
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}
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}
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return result;
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}
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template <class ForwardIterator, class OutputIterator, class Traits>
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OutputIterator
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segment_intersection_points_2(ForwardIterator first, ForwardIterator last,
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OutputIterator result,
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const Traits& traits)
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{ return si_brute_force_II( first, last, result, traits); }
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template <class ForwardIterator, class OutputIterator, class Traits>
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OutputIterator
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segment_intersection_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 segment_intersection_points_2( first, last, result, Kernel());
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}
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} // namespace CGAL
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#endif // CGAL_SEGMENT_INTERSECTION_POINTS_2_H
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