mirror of https://github.com/CGAL/cgal
248 lines
6.2 KiB
C++
248 lines
6.2 KiB
C++
// Copyright (c) 2000 Utrecht University (The Netherlands),
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// ETH Zurich (Switzerland), Freie Universitaet Berlin (Germany),
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// INRIA Sophia-Antipolis (France), Martin-Luther-University Halle-Wittenberg
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// (Germany), Max-Planck-Institute Saarbruecken (Germany), RISC Linz (Austria),
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// and Tel-Aviv University (Israel). All rights reserved.
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//
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// This file is part of CGAL (www.cgal.org); you can redistribute it and/or
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// modify it under the terms of the GNU Lesser General Public License as
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// published by the Free Software Foundation; version 2.1 of the License.
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// See the file LICENSE.LGPL distributed with CGAL.
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//
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// Licensees holding a valid commercial license may use this file in
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// accordance with the commercial license agreement provided with the software.
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//
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// This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
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// WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
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//
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// $Source$
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// $Revision$ $Date$
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// $Name$
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//
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// Author(s) : Andreas Fabri, Herve Bronnimann
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#ifndef CGAL_CARTESIAN_DIRECTION_2_H
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#define CGAL_CARTESIAN_DIRECTION_2_H
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#include <CGAL/Twotuple.h>
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CGAL_BEGIN_NAMESPACE
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template < class R_ >
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class DirectionC2
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{
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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_::Vector_2 Vector_2;
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typedef typename R_::Line_2 Line_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_::Direction_2 Direction_2;
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typedef typename R_::Aff_transformation_2 Aff_transformation_2;
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typedef Twotuple<FT> Rep;
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typedef typename R_::template Handle<Rep>::type Base;
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Base base;
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public:
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typedef R_ R;
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DirectionC2() {}
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DirectionC2(const Vector_2 &v)
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{ *this = v.direction(); }
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DirectionC2(const Line_2 &l)
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{ *this = l.direction(); }
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DirectionC2(const Ray_2 &r)
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{ *this = r.direction(); }
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DirectionC2(const Segment_2 &s)
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{ *this = s.direction(); }
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DirectionC2(const FT &x, const FT &y)
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: base(x, y) {}
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bool operator==(const DirectionC2 &d) const;
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bool operator!=(const DirectionC2 &d) const;
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bool operator>=(const DirectionC2 &d) const;
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bool operator<=(const DirectionC2 &d) const;
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bool operator>(const DirectionC2 &d) const;
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bool operator<(const DirectionC2 &d) const;
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bool counterclockwise_in_between( const DirectionC2 &d1,
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const DirectionC2 &d2) const;
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Vector_2 to_vector() const;
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Vector_2 vector() const { return to_vector(); }
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Direction_2 perpendicular(const Orientation &o) const;
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Direction_2 transform(const Aff_transformation_2 &t) const
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{
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return t.transform(*this);
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}
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Direction_2 operator-() const;
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const FT & delta(int i) const;
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const FT & dx() const
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{
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return get(base).e0;
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}
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const FT & dy() const
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{
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return get(base).e1;
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}
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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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DirectionC2<R>::operator==(const DirectionC2<R> &d) const
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{
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if (CGAL::identical(base, d.base))
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return true;
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return equal_direction(*this, d);
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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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DirectionC2<R>::operator!=(const DirectionC2<R> &d) const
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{
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return !( *this == d );
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}
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template < class R >
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CGAL_KERNEL_MEDIUM_INLINE
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bool
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DirectionC2<R>::operator<(const DirectionC2<R> &d) const
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{
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return compare_angle_with_x_axis(*this, d) == SMALLER;
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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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DirectionC2<R>::operator>(const DirectionC2<R> &d) const
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{
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return d < *this;
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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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DirectionC2<R>::operator>=(const DirectionC2<R> &d) const
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{
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return compare_angle_with_x_axis(*this, d) != SMALLER;
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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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DirectionC2<R>::operator<=(const DirectionC2<R> &d) const
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{
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return compare_angle_with_x_axis(*this, d) != LARGER;
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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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DirectionC2<R>::
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counterclockwise_in_between(const DirectionC2<R> &d1,
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const DirectionC2<R> &d2) const
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// returns true, iff \ccVar\ is not equal to \ccc{d1}, and
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// while rotating counterclockwise starting at \ccc{d1},
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// \ccVar\ is reached strictly before \ccc{d2} is reached.
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// Note that true is returned if \ccc{d1} == \ccc{d2}, unless
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// also \ccVar\ == \ccc{d1}.
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{
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return R().counterclockwise_in_between_2_object()(*this, d1, d2);
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}
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template < class R >
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inline
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typename DirectionC2<R>::Vector_2
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DirectionC2<R>::to_vector() const
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{
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return Vector_2(dx(), dy());
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}
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template < class R >
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CGAL_KERNEL_MEDIUM_INLINE
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typename DirectionC2<R>::Direction_2
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DirectionC2<R>::perpendicular(const Orientation &o) const
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{
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CGAL_kernel_precondition(o != COLLINEAR);
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if (o == COUNTERCLOCKWISE)
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return DirectionC2<R>(-dy(), dx());
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else
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return DirectionC2<R>(dy(), -dx());
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}
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template < class R >
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inline
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typename DirectionC2<R>::Direction_2
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DirectionC2<R>::operator-() const
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{
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return DirectionC2<R>(-dx(), -dy());
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}
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template < class R >
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CGAL_KERNEL_INLINE
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const typename DirectionC2<R>::FT &
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DirectionC2<R>::delta(int i) const
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{
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CGAL_kernel_precondition( ( i == 0 ) || ( i == 1 ) );
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return (i==0) ? dx() : dy();
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}
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#ifndef CGAL_NO_OSTREAM_INSERT_DIRECTIONC2
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template < class R >
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std::ostream&
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operator<<(std::ostream &os, const DirectionC2<R> &d)
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{
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typename R::Vector_2 v = d.to_vector();
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switch(os.iword(IO::mode)) {
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case IO::ASCII :
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return os << v.x() << ' ' << v.y();
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case IO::BINARY :
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write(os, v.x());
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write(os, v.y());
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return os;
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default:
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return os << "DirectionC2(" << v.x() << ", " << v.y() << ')';
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}
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}
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#endif // CGAL_NO_OSTREAM_INSERT_DIRECTIONC2
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#ifndef CGAL_NO_ISTREAM_EXTRACT_DIRECTIONC2
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template < class R >
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std::istream&
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operator>>(std::istream &is, DirectionC2<R> &p)
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{
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typename R::FT x, y;
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switch(is.iword(IO::mode)) {
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case IO::ASCII :
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is >> x >> y;
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break;
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case IO::BINARY :
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read(is, x);
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read(is, y);
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break;
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default:
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std::cerr << std::endl << "Stream must be in ascii or binary mode"
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<< std::endl;
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break;
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}
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if (is)
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p = DirectionC2<R>(x, y);
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return is;
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}
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#endif // CGAL_NO_ISTREAM_EXTRACT_DIRECTIONC2
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CGAL_END_NAMESPACE
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#endif // CGAL_CARTESIAN_DIRECTION_2_H
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