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// Copyright (c) 2003,2004,2005,2006 INRIA Sophia-Antipolis (France).
// All rights reserved.
//
// This file is part of CGAL (www.cgal.org).
// You can redistribute it and/or modify it under the terms of the GNU
// General Public License as published by the Free Software Foundation,
// either version 3 of the License, or (at your option) any later version.
//
// Licensees holding a valid commercial license may use this file in
// accordance with the commercial license agreement provided with the software.
//
// This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
// WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
//
// $URL$
// $Id$
// SPDX-License-Identifier: GPL-3.0+
//
//
// Author(s) : Menelaos Karavelas <mkaravel@iacm.forth.gr>
#ifndef CGAL_SEGMENT_DELAUNAY_GRAPH_2_ORIENTED_SIDE_C2_H
#define CGAL_SEGMENT_DELAUNAY_GRAPH_2_ORIENTED_SIDE_C2_H
#include <CGAL/license/Segment_Delaunay_graph_2.h>
#include <CGAL/Segment_Delaunay_graph_2/Basic_predicates_C2.h>
#include <CGAL/Segment_Delaunay_graph_2/Voronoi_vertex_C2.h>
namespace CGAL {
namespace SegmentDelaunayGraph_2 {
//-----------------------------------------------------------------------------
template<class K, class Method_tag>
class Oriented_side_C2
: public Basic_predicates_C2<K>
{
private:
typedef Basic_predicates_C2<K> Base;
typedef Voronoi_vertex_C2<K,Method_tag> Voronoi_vertex_2;
typedef typename Base::Point_2 Point_2;
typedef typename Base::Segment_2 Segment_2;
typedef typename Base::Line_2 Line_2;
typedef typename Base::Site_2 Site_2;
typedef typename Base::FT FT;
typedef typename Base::RT RT;
using Base::compute_supporting_line;
using Base::compute_perpendicular;
public:
typedef typename Base::Oriented_side Oriented_side;
typedef Oriented_side result_type;
typedef Site_2 argument_type;
// computes the oriented side of the Voronoi vertex of s1, s2, inf
// wrt the line that passes through the point p and its direction
// is the direction of the supporting line of s, rotated by 90
// degrees counterclockwise.
Oriented_side operator()(const Site_2& s1, const Site_2& s2,
const Site_2& s, const Site_2& p) const
{
CGAL_precondition(s1.is_point() || s2.is_point());
CGAL_precondition(s1.is_segment() || s2.is_segment());
return this->operator()((s1.is_point()? s1: s2), s, p);
}
// computes the oriented side of the point q
// wrt the line that is passes through the point p and its direction
// is the direction of the supporting line of s, rotated by 90
// degrees counterclockwise.
Oriented_side operator()(const Site_2& q,
const Site_2& s, const Site_2& p) const
{
CGAL_precondition( q.is_point() );
CGAL_precondition( s.is_segment() && p.is_point() );
Line_2 l = compute_supporting_line( s );
Line_2 lp = compute_perpendicular(l, p.point());
return lp.oriented_side(q.point());
}
// computes the oriented side of the Voronoi vertex of s1, s2, s3
// wrt the line that is passes through the point p and its direction
// is the direction of the supporting line of s, rotated by 90
// degrees counterclockwise.
Oriented_side operator()(const Site_2& s1, const Site_2& s2,
const Site_2& s3,
const Site_2& s, const Site_2& p) const
{
CGAL_precondition( s.is_segment() && p.is_point() );
Voronoi_vertex_2 v(s1, s2, s3);
Line_2 l = compute_supporting_line( s );
Line_2 lp = compute_perpendicular(l, p.point());
return v.oriented_side(lp);
}
};
//-----------------------------------------------------------------------------
} //namespace SegmentDelaunayGraph_2
} //namespace CGAL
#endif // CGAL_SEGMENT_DELAUNAY_GRAPH_2_ORIENTED_SIDE_C2_H
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