mirror of https://github.com/CGAL/cgal
308 lines
6.9 KiB
C++
308 lines
6.9 KiB
C++
// ======================================================================
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//
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// Copyright (c) 2000 The CGAL Consortium
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//
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// This software and related documentation is part of an INTERNAL release
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// of the Computational Geometry Algorithms Library (CGAL). It is not
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// intended for general use.
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//
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// ----------------------------------------------------------------------
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//
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// release :
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// release_date :
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//
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// file : include/CGAL/Cartesian/Line_2.h
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// revision : $Revision$
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// revision_date : $Date$
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// author(s) : Andreas Fabri, Herve Bronnimann
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// coordinator : INRIA Sophia-Antipolis (Mariette.Yvinec@sophia.inria.fr)
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//
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// ======================================================================
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#ifndef CGAL_CARTESIAN_LINE_2_H
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#define CGAL_CARTESIAN_LINE_2_H
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#include <CGAL/Threetuple.h>
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CGAL_BEGIN_NAMESPACE
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template < class R_ >
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class LineC2
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: public R_::template Handle<Threetuple<typename R_::FT> >::type
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{
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CGAL_VC7_BUG_PROTECTED
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typedef typename R_::FT FT;
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typedef typename R_::Point_2 Point_2;
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typedef typename R_::Direction_2 Direction_2;
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typedef typename R_::Ray_2 Ray_2;
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typedef typename R_::Segment_2 Segment_2;
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typedef typename R_::Line_2 Line_2;
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typedef typename R_::Aff_transformation_2 Aff_transformation_2;
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typedef Threetuple<FT> rep;
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typedef typename R_::template Handle<rep>::type base;
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public:
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typedef R_ R;
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LineC2()
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: base(rep()) {}
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LineC2(const Point_2 &p, const Point_2 &q)
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: base(line_from_points(p, q)) {}
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LineC2(const FT &a, const FT &b, const FT &c)
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: base(rep(a, b, c)) {}
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LineC2(const Segment_2 &s)
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: base(line_from_points(s.source(), s.target())) {}
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LineC2(const Ray_2 &r)
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: base(line_from_points(r.point(0), r.point(1))) {}
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LineC2(const Point_2 &p, const Direction_2 &d)
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: base(line_from_point_direction(p, d)) {}
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bool operator==(const LineC2 &l) const;
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bool operator!=(const LineC2 &l) const;
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const FT & a() const
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{
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return Ptr()->e0;
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}
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const FT & b() const
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{
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return Ptr()->e1;
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}
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const FT & c() const
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{
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return Ptr()->e2;
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}
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FT x_at_y(const FT &y) const;
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FT y_at_x(const FT &x) const;
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Line_2 perpendicular(const Point_2 &p) const;
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Line_2 opposite() const;
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Point_2 point(int i) const;
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Point_2 point() const;
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Point_2 projection(const Point_2 &p) const;
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Direction_2 direction() const;
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Oriented_side oriented_side(const Point_2 &p) const;
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bool has_on_boundary(const Point_2 &p) const;
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bool has_on_positive_side(const Point_2 &p) const;
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bool has_on_negative_side(const Point_2 &p) const;
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bool has_on(const Point_2 &p) const { return has_on_boundary(p); }
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bool is_horizontal() const;
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bool is_vertical() const;
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bool is_degenerate() const;
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Line_2 transform(const Aff_transformation_2 &t) const
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{
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return LineC2<R>(t.transform(point(0)),
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t.transform(direction()));
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}
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};
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template < class R >
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CGAL_KERNEL_INLINE
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bool
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LineC2<R>::operator==(const LineC2<R> &l) const
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{
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if (identical(l))
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return true;
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return equal_line(*this, l);
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}
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template < class R >
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inline
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bool
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LineC2<R>::operator!=(const LineC2<R> &l) const
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{
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return !(*this == l);
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}
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template < class R >
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inline
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bool
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LineC2<R>::is_horizontal() const
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{ // FIXME : predicate
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return CGAL_NTS is_zero(a());
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}
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template < class R >
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inline
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bool
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LineC2<R>::is_vertical() const
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{ // FIXME : predicate
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return CGAL_NTS is_zero(b());
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}
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template < class R >
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CGAL_KERNEL_INLINE
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typename LineC2<R>::FT
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LineC2<R>::x_at_y(const typename LineC2<R>::FT &y) const
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{
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CGAL_kernel_precondition_msg( ! is_horizontal(),
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"Line::x_at_y(FT y) is undefined for horizontal line");
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return line_x_at_y(*this, y);
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}
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template < class R >
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CGAL_KERNEL_INLINE
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typename LineC2<R>::FT
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LineC2<R>::y_at_x(const typename LineC2<R>::FT &x) const
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{
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CGAL_kernel_precondition_msg( ! is_vertical(),
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"Line::y_at_x(FT x) is undefined for vertical line");
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return line_y_at_x(*this, x);
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}
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template < class R >
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inline
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typename LineC2<R>::Line_2
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LineC2<R>::
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perpendicular(const typename LineC2<R>::Point_2 &p) const
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{
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return perpendicular_through_point(*this, p);
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}
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template < class R >
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inline
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typename LineC2<R>::Line_2
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LineC2<R>::opposite() const
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{
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return LineC2<R>( -a(), -b(), -c() );
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}
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template < class R >
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CGAL_KERNEL_INLINE
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typename LineC2<R>::Point_2
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LineC2<R>::point(int i) const
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{
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return line_get_point(*this, i);
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}
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template < class R >
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CGAL_KERNEL_INLINE
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typename LineC2<R>::Point_2
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LineC2<R>::point() const
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{
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return line_get_point(*this, 0);
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}
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template < class R >
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CGAL_KERNEL_MEDIUM_INLINE
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typename LineC2<R>::Point_2
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LineC2<R>::
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projection(const typename LineC2<R>::Point_2 &p) const
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{
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return line_project_point(*this, p);
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}
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template < class R >
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inline
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typename LineC2<R>::Direction_2
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LineC2<R>::direction() const
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{
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return Direction_2( b(), -a() );
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}
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template < class R >
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CGAL_KERNEL_INLINE
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Oriented_side
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LineC2<R>::
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oriented_side(const typename LineC2<R>::Point_2 &p) const
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{
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return side_of_oriented_line(*this, p);
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}
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template < class R >
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inline
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bool
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LineC2<R>::
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has_on_boundary(const typename LineC2<R>::Point_2 &p) const
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{
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return oriented_side(p) == ON_ORIENTED_BOUNDARY;
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}
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template < class R >
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inline
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bool
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LineC2<R>::
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has_on_positive_side(const typename LineC2<R>::Point_2 &p) const
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{
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return oriented_side(p) == ON_POSITIVE_SIDE;
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}
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template < class R >
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CGAL_KERNEL_INLINE
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bool
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LineC2<R>::
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has_on_negative_side(const typename LineC2<R>::Point_2 &p) const
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{
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return oriented_side(p) == ON_NEGATIVE_SIDE;
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}
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template < class R >
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inline
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bool
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LineC2<R>::is_degenerate() const
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{
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return is_horizontal() && is_vertical();
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}
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#ifndef CGAL_NO_OSTREAM_INSERT_LINEC2
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template < class R >
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std::ostream &
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operator<<(std::ostream &os, const LineC2<R> &l)
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{
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switch(os.iword(IO::mode)) {
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case IO::ASCII :
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return os << l.a() << ' ' << l.b() << ' ' << l.c();
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case IO::BINARY :
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write(os, l.a());
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write(os, l.b());
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write(os, l.c());
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return os;
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default:
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return os << "LineC2(" << l.a()
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<< ", " << l.b() << ", " << l.c() <<')';
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}
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}
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#endif // CGAL_NO_OSTREAM_INSERT_LINEC2
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#ifndef CGAL_NO_ISTREAM_EXTRACT_LINEC2
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template < class R >
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std::istream &
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operator>>(std::istream &is, LineC2<R> &l)
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{
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typename R::FT a, b, c;
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switch(is.iword(IO::mode)) {
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case IO::ASCII :
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is >> a >> b >> c;
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break;
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case IO::BINARY :
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read(is, a);
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read(is, b);
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read(is, c);
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break;
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default:
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std::cerr << "" << std::endl;
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std::cerr << "Stream must be in ascii or binary mode" << std::endl;
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break;
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}
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if (is)
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l = LineC2<R>(a, b, c);
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return is;
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}
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#endif // CGAL_NO_ISTREAM_EXTRACT_LINEC2
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CGAL_END_NAMESPACE
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#endif // CGAL_CARTESIAN_LINE_2_H
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