156 lines
3.9 KiB
C
156 lines
3.9 KiB
C
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// Copyright (c) 1999
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// Utrecht University (The Netherlands),
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// ETH Zurich (Switzerland),
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// INRIA Sophia-Antipolis (France),
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// Max-Planck-Institute Saarbruecken (Germany),
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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; either version 3 of the License,
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// or (at your option) any later version.
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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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// $URL$
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// $Id$
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// SPDX-License-Identifier: LGPL-3.0+
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//
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//
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// Author(s) : Stefan Schirra
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#ifndef CGAL_HOMOGENEOUS_POINT_2_H
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#define CGAL_HOMOGENEOUS_POINT_2_H
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#include <CGAL/Origin.h>
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#include <boost/utility/enable_if.hpp>
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#include <boost/type_traits/is_convertible.hpp>
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#include <boost/mpl/and.hpp>
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#include <boost/mpl/logical.hpp>
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namespace CGAL {
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template < class R_ >
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class PointH2
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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_::Vector_2 Vector_2;
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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 Rational_traits<FT> Rat_traits;
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// Reference-counting is handled in Vector_2.
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Vector_2 base;
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public:
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typedef FT Cartesian_coordinate_type;
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typedef const RT& Homogeneous_coordinate_type;
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typedef typename Vector_2::Cartesian_const_iterator Cartesian_const_iterator;
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typedef R_ R;
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PointH2() {}
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PointH2(const Origin &)
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: base(NULL_VECTOR) {}
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template < typename Tx, typename Ty >
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PointH2(const Tx & x, const Ty & y,
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typename boost::enable_if< boost::mpl::and_<boost::is_convertible<Tx, RT>,
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boost::is_convertible<Ty, RT> > >::type* = 0)
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: base(x, y) {}
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PointH2(const FT& x, const FT& y)
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: base(x, y) {}
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PointH2(const RT& hx, const RT& hy, const RT& hw)
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: base(hx, hy, hw) {}
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bool operator==( const PointH2<R>& p) const;
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bool operator!=( const PointH2<R>& p) const;
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const RT & hx() const { return base.hx(); }
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const RT & hy() const { return base.hy(); }
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const RT & hw() const { return base.hw(); }
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FT x() const { return FT(hx()) / FT(hw()); }
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FT y() const { return FT(hy()) / FT(hw()); }
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FT cartesian(int i) const;
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FT operator[](int i) const;
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const RT & homogeneous(int i) const;
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Cartesian_const_iterator cartesian_begin() const
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{
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return base.cartesian_begin();
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}
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Cartesian_const_iterator cartesian_end() const
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{
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return base.cartesian_end();
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}
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int dimension() const;
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Direction_2 direction() const;
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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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PointH2<R>::operator==( const PointH2<R>& p) const
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{
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return base == p.base;
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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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PointH2<R>::operator!=( const PointH2<R>& p) const
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{ return !(*this == p); }
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template < class R >
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inline
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typename PointH2<R>::FT
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PointH2<R>::cartesian(int i) const
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{
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return base.cartesian(i);
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}
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template < class R >
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inline
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const typename PointH2<R>::RT &
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PointH2<R>::homogeneous(int i) const
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{
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return base.homogeneous(i);
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}
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template < class R >
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inline
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typename PointH2<R>::FT
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PointH2<R>::operator[](int i) const
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{ return base[i]; }
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template < class R >
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inline
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int
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PointH2<R>::dimension() const
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{ return base.dimension(); }
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template < class R >
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inline
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typename PointH2<R>::Direction_2
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PointH2<R>::direction() const
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{ return typename PointH2<R>::Direction_2(*this); }
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} //namespace CGAL
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#endif // CGAL_HOMOGENEOUS_POINT_2_H
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