113 lines
3.1 KiB
C++
113 lines
3.1 KiB
C++
// 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)
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//
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// $URL: https://github.com/CGAL/cgal/blob/v5.1/Homogeneous_kernel/include/CGAL/Homogeneous/DirectionH2.h $
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// $Id: DirectionH2.h 0779373 2020-03-26T13:31:46+01:00 Sébastien Loriot
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// SPDX-License-Identifier: LGPL-3.0-or-later OR LicenseRef-Commercial
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//
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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/array.h>
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#include <CGAL/Handle_for.h>
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#include <CGAL/kernel_config.h>
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#include <CGAL/number_type_basic.h>
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namespace CGAL {
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template < class R_ >
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class DirectionH2
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{
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typedef DirectionH2<R_> Self;
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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 std::array<RT, 3> 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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typedef const RT& Homogeneous_coordinate_type;
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const Self&
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rep() const
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{
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return static_cast<const Self& >(*this);
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}
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DirectionH2() {}
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DirectionH2(const RT& x, const RT& y)
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: base(CGAL::make_array(x, y, RT(1))) {}
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// TODO Not documented : should not exist, not used.
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// we should also change array<RT, 3> -> array<RT, 2>
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DirectionH2(const RT& x, const RT& y, const RT& w )
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: base( w > RT(0) ? CGAL::make_array(x, y, w)
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: CGAL::make_array<RT>(-x, -y, -w) ) {}
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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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Vector_2 to_vector() const;
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const RT & x() const { return CGAL::get_pointee_or_identity(base)[0]; }
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const RT & y() const { return CGAL::get_pointee_or_identity(base)[1]; }
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const RT & delta(int i) const;
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const RT & dx() const { return CGAL::get_pointee_or_identity(base)[0]; }
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const RT & dy() const { return CGAL::get_pointee_or_identity(base)[1]; }
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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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} //namespace CGAL
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#include <CGAL/Homogeneous/predicates_on_directionsH2.h>
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namespace CGAL {
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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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} //namespace CGAL
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#endif // CGAL_HOMOGENEOUS_DIRECTION_2_H
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