mirror of https://github.com/CGAL/cgal
234 lines
6.1 KiB
C++
234 lines
6.1 KiB
C++
// Copyright (c) 1999 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) : Stefan Schirra
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#ifndef CGAL_HOMOGENEOUS_DIRECTION_2_H
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#define CGAL_HOMOGENEOUS_DIRECTION_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 DirectionH2
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: public R_::template Handle<Threetuple<typename R_::RT> >::type
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{
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typedef typename R_::FT FT;
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typedef typename R_::RT RT;
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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_::Aff_transformation_2 Aff_transformation_2;
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typedef Threetuple<RT> rep;
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typedef typename R_::template Handle<rep>::type base;
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const base& Base() const { return *this; }
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base& Base() { return *this; }
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public:
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typedef R_ R;
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DirectionH2() {}
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DirectionH2(const DirectionH2<R>& d )
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: base ( d ) {}
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DirectionH2(const Point_2 & p )
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: base ( p) {}
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DirectionH2(const Vector_2 & v )
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: base ( v) {}
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DirectionH2(const Line_2 & l )
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: base ( l.direction()) {}
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DirectionH2(const Ray_2 & r )
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: base ( r.direction()) {}
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DirectionH2(const Segment_2 & s )
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: base ( s.direction()) {}
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DirectionH2(const RT& x, const RT& y)
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: base (x, y, RT(1)) {}
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// TODO Not documented : should not exist , not used.
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// we should also change Threetuple<RT> -> Twotuple<RT>
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DirectionH2(const RT& x, const RT& y, const RT& w )
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{
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if (w > RT(0) )
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Base() = rep(x, y, w);
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else
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Base() = rep(-x, -y, -w);
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}
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bool operator==( const DirectionH2<R>& d) const;
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bool operator!=( const DirectionH2<R>& d) const;
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bool counterclockwise_in_between( const DirectionH2<R>& d1,
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const DirectionH2<R>& d2 ) const;
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DirectionH2<R> operator-() 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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const RT & x() const { return get(Base()).e0; };
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const RT & y() const { return get(Base()).e1; };
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const RT & delta(int i) const;
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const RT & dx() const { return get(Base()).e0; };
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const RT & dy() const { return get(Base()).e1; };
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DirectionH2<R> perpendicular(const Orientation &o) const;
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DirectionH2<R> transform(const Aff_transformation_2 &) const;
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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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DirectionH2<R>::operator==( const DirectionH2<R>& d) const
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{
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return ( ( x() * d.y() == y() * d.x() )
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&&( CGAL_NTS sign( x() ) == CGAL_NTS sign( d.x() ) )
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&&( CGAL_NTS sign( y() ) == CGAL_NTS sign( d.y() ) ) );
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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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DirectionH2<R>::operator!=( const DirectionH2<R>& d) const
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{ return !(*this == d); }
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template <class R >
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inline
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DirectionH2<R>
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DirectionH2<R>::operator-() const
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{ return DirectionH2<R>( - x(), - y() ); }
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template <class R >
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CGAL_KERNEL_INLINE
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const typename DirectionH2<R>::RT &
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DirectionH2<R>::delta(int i) const
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{
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CGAL_kernel_precondition( ( i == 0 ) || ( i == 1 ) );
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if (i == 0)
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return dx();
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return dy();
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}
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CGAL_END_NAMESPACE
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#include <CGAL/Homogeneous/predicates_on_directionsH2.h>
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CGAL_BEGIN_NAMESPACE
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template <class R >
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CGAL_KERNEL_INLINE
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bool
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DirectionH2<R>::
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counterclockwise_in_between( const DirectionH2<R>& d1,
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const DirectionH2<R>& d2) const
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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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CGAL_KERNEL_INLINE
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DirectionH2<R>
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DirectionH2<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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{
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return DirectionH2<R>(-dy(), dx());
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}
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else
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{
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return DirectionH2<R>(dy(), -dx());
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}
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}
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template <class R >
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inline
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DirectionH2<R>
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DirectionH2<R>::
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transform(const typename DirectionH2<R>::Aff_transformation_2& t) const
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{ return t.transform(*this); }
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template <class R >
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CGAL_KERNEL_INLINE
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typename DirectionH2<R>::Vector_2
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DirectionH2<R>::to_vector() const
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{ return Vector_2(dx(), dy()); }
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#ifndef CGAL_NO_OSTREAM_INSERT_DIRECTIONH2
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template < class R >
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std::ostream &
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operator<<(std::ostream &os, const DirectionH2<R> &p)
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{
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switch(os.iword(IO::mode))
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{
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case IO::ASCII :
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return os << p.dx() << ' ' << p.dy();
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case IO::BINARY :
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write(os, p.dx());
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write(os, p.dy());
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return os;
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default:
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return os << "DirectionH2(" << p.dx() << ", "
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<< p.dy() << ')';
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}
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}
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#endif // CGAL_NO_OSTREAM_INSERT_DIRECTIONH2
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#ifndef CGAL_NO_ISTREAM_EXTRACT_DIRECTIONH2
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template < class R >
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std::istream &
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operator>>(std::istream &is, DirectionH2<R> &p)
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{
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typename R::RT x, y;
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switch(is.iword(IO::mode))
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{
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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;
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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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p = DirectionH2<R>(x, y);
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return is;
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}
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#endif // CGAL_NO_ISTREAM_EXTRACT_DIRECTIONH2
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CGAL_END_NAMESPACE
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#endif // CGAL_HOMOGENEOUS_DIRECTION_2_H
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