113 lines
3.1 KiB
C
113 lines
3.1 KiB
C
|
// Copyright (c) 1999
|
||
|
|
// Utrecht University (The Netherlands),
|
||
|
|
// ETH Zurich (Switzerland),
|
||
|
|
// INRIA Sophia-Antipolis (France),
|
||
|
|
// Max-Planck-Institute Saarbruecken (Germany),
|
||
|
|
// and Tel-Aviv University (Israel). All rights reserved.
|
||
|
|
//
|
||
|
|
// This file is part of CGAL (www.cgal.org)
|
||
|
|
//
|
||
|
|
// $URL: https://github.com/CGAL/cgal/blob/v5.1/Homogeneous_kernel/include/CGAL/Homogeneous/DirectionH2.h $
|
||
|
|
// $Id: DirectionH2.h 0779373 2020-03-26T13:31:46+01:00 Sébastien Loriot
|
||
|
|
// SPDX-License-Identifier: LGPL-3.0-or-later OR LicenseRef-Commercial
|
||
|
|
//
|
||
|
|
//
|
||
|
|
// Author(s) : Stefan Schirra
|
||
|
|
|
||
|
|
#ifndef CGAL_HOMOGENEOUS_DIRECTION_2_H
|
||
|
|
#define CGAL_HOMOGENEOUS_DIRECTION_2_H
|
||
|
|
|
||
|
|
#include <CGAL/array.h>
|
||
|
|
#include <CGAL/Handle_for.h>
|
||
|
|
#include <CGAL/kernel_config.h>
|
||
|
|
#include <CGAL/number_type_basic.h>
|
||
|
|
|
||
|
|
namespace CGAL {
|
||
|
|
|
||
|
|
template < class R_ >
|
||
|
|
class DirectionH2
|
||
|
|
{
|
||
|
|
typedef DirectionH2<R_> Self;
|
||
|
|
typedef typename R_::FT FT;
|
||
|
|
typedef typename R_::RT RT;
|
||
|
|
typedef typename R_::Point_2 Point_2;
|
||
|
|
typedef typename R_::Vector_2 Vector_2;
|
||
|
|
typedef typename R_::Line_2 Line_2;
|
||
|
|
typedef typename R_::Ray_2 Ray_2;
|
||
|
|
typedef typename R_::Segment_2 Segment_2;
|
||
|
|
|
||
|
|
typedef std::array<RT, 3> Rep;
|
||
|
|
typedef typename R_::template Handle<Rep>::type Base;
|
||
|
|
|
||
|
|
Base base;
|
||
|
|
|
||
|
|
public:
|
||
|
|
|
||
|
|
typedef R_ R;
|
||
|
|
|
||
|
|
typedef const RT& Homogeneous_coordinate_type;
|
||
|
|
|
||
|
|
const Self&
|
||
|
|
rep() const
|
||
|
|
{
|
||
|
|
return static_cast<const Self& >(*this);
|
||
|
|
}
|
||
|
|
|
||
|
|
DirectionH2() {}
|
||
|
|
|
||
|
|
DirectionH2(const RT& x, const RT& y)
|
||
|
|
: base(CGAL::make_array(x, y, RT(1))) {}
|
||
|
|
|
||
|
|
// TODO Not documented : should not exist, not used.
|
||
|
|
// we should also change array<RT, 3> -> array<RT, 2>
|
||
|
|
DirectionH2(const RT& x, const RT& y, const RT& w )
|
||
|
|
: base( w > RT(0) ? CGAL::make_array(x, y, w)
|
||
|
|
: CGAL::make_array<RT>(-x, -y, -w) ) {}
|
||
|
|
|
||
|
|
bool operator==( const DirectionH2<R>& d) const;
|
||
|
|
bool operator!=( const DirectionH2<R>& d) const;
|
||
|
|
|
||
|
|
|
||
|
|
Vector_2 to_vector() const;
|
||
|
|
|
||
|
|
const RT & x() const { return CGAL::get_pointee_or_identity(base)[0]; }
|
||
|
|
const RT & y() const { return CGAL::get_pointee_or_identity(base)[1]; }
|
||
|
|
|
||
|
|
const RT & delta(int i) const;
|
||
|
|
const RT & dx() const { return CGAL::get_pointee_or_identity(base)[0]; }
|
||
|
|
const RT & dy() const { return CGAL::get_pointee_or_identity(base)[1]; }
|
||
|
|
|
||
|
|
};
|
||
|
|
|
||
|
|
template <class R >
|
||
|
|
CGAL_KERNEL_INLINE
|
||
|
|
bool
|
||
|
|
DirectionH2<R>::operator==( const DirectionH2<R>& d) const
|
||
|
|
{
|
||
|
|
return ( ( x() * d.y() == y() * d.x() )
|
||
|
|
&&( CGAL_NTS sign( x() ) == CGAL_NTS sign( d.x() ) )
|
||
|
|
&&( CGAL_NTS sign( y() ) == CGAL_NTS sign( d.y() ) ) );
|
||
|
|
}
|
||
|
|
|
||
|
|
template <class R >
|
||
|
|
inline
|
||
|
|
bool
|
||
|
|
DirectionH2<R>::operator!=( const DirectionH2<R>& d) const
|
||
|
|
{ return !(*this == d); }
|
||
|
|
|
||
|
|
} //namespace CGAL
|
||
|
|
|
||
|
|
#include <CGAL/Homogeneous/predicates_on_directionsH2.h>
|
||
|
|
|
||
|
|
namespace CGAL {
|
||
|
|
|
||
|
|
template <class R >
|
||
|
|
CGAL_KERNEL_INLINE
|
||
|
|
typename DirectionH2<R>::Vector_2
|
||
|
|
DirectionH2<R>::to_vector() const
|
||
|
|
{ return Vector_2(dx(), dy()); }
|
||
|
|
|
||
|
|
} //namespace CGAL
|
||
|
|
|
||
|
|
#endif // CGAL_HOMOGENEOUS_DIRECTION_2_H
|