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// 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/v6.1/Homogeneous_kernel/include/CGAL/Homogeneous/LineH2.h $
// $Id: include/CGAL/Homogeneous/LineH2.h b26b07a1242 $
// SPDX-License-Identifier: LGPL-3.0-or-later OR LicenseRef-Commercial
//
//
// Author(s) : Stefan Schirra
#ifndef CGAL_LINEH2_H
#define CGAL_LINEH2_H
#include <CGAL/kernel_config.h>
#include <CGAL/array.h>
namespace CGAL {
template < class R_ >
class LineH2
{
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_::Direction_2 Direction_2;
typedef typename R_::Segment_2 Segment_2;
typedef typename R_::Ray_2 Ray_2;
typedef typename R_::Line_2 Line_2;
typedef std::array<RT, 3> Rep;
typedef typename R_::template Handle<Rep>::type Base;
Base base;
public:
typedef R_ R;
LineH2() {}
LineH2(const RT& a, const RT& b, const RT& c)
: base{a, b, c} {}
typename R_::Boolean operator==(const LineH2<R>& l) const;
typename R_::Boolean operator!=(const LineH2<R>& l) const;
const RT & a() const { return get_pointee_or_identity(base)[0]; }
const RT & b() const { return get_pointee_or_identity(base)[1]; }
const RT & c() const { return get_pointee_or_identity(base)[2]; }
};
template < class R >
CGAL_KERNEL_MEDIUM_INLINE
typename R::Boolean
LineH2<R>::operator==(const LineH2<R>& l) const
{
if ( (a() * l.c() != l.a() * c() )
||(b() * l.c() != l.b() * c() ) )
{
return false;
}
int sc = static_cast<int>(CGAL_NTS sign(c()));
int slc = static_cast<int>(CGAL_NTS sign(l.c()));
if ( sc == slc )
{
if (sc == 0)
return ( (a()*l.b() == b()*l.a() )
&&(CGAL_NTS sign(a() )== CGAL_NTS sign( l.a() ))
&&(CGAL_NTS sign(b() )== CGAL_NTS sign( l.b() )) );
else
return true;
}
else
return false;
}
template < class R >
inline
typename R::Boolean
LineH2<R>::operator!=(const LineH2<R>& l) const
{ return !(*this == l); }
} //namespace CGAL
#endif // CGAL_LINEH2_H
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