93 lines
2.5 KiB
C
93 lines
2.5 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)
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//
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// $URL: https://github.com/CGAL/cgal/blob/v5.1/Homogeneous_kernel/include/CGAL/Homogeneous/LineH2.h $
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// $Id: LineH2.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_LINEH2_H
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#define CGAL_LINEH2_H
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#include <CGAL/kernel_config.h>
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#include <CGAL/array.h>
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namespace CGAL {
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template < class R_ >
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class LineH2
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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_::Direction_2 Direction_2;
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typedef typename R_::Segment_2 Segment_2;
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typedef typename R_::Ray_2 Ray_2;
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typedef typename R_::Line_2 Line_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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LineH2() {}
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LineH2(const RT& a, const RT& b, const RT& c)
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: base(CGAL::make_array(a, b, c)) {}
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bool operator==(const LineH2<R>& l) const;
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bool operator!=(const LineH2<R>& l) const;
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const RT & a() const { return get_pointee_or_identity(base)[0]; }
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const RT & b() const { return get_pointee_or_identity(base)[1]; }
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const RT & c() const { return get_pointee_or_identity(base)[2]; }
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};
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template < class R >
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CGAL_KERNEL_MEDIUM_INLINE
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bool
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LineH2<R>::operator==(const LineH2<R>& l) const
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{
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if ( (a() * l.c() != l.a() * c() )
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||(b() * l.c() != l.b() * c() ) )
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{
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return false;
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}
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int sc = static_cast<int>(CGAL_NTS sign(c()));
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int slc = static_cast<int>(CGAL_NTS sign(l.c()));
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if ( sc == slc )
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{
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if (sc == 0)
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return ( (a()*l.b() == b()*l.a() )
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&&(CGAL_NTS sign(a() )== CGAL_NTS sign( l.a() ))
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&&(CGAL_NTS sign(b() )== CGAL_NTS sign( l.b() )) );
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else
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return true;
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}
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else
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return false;
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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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LineH2<R>::operator!=(const LineH2<R>& l) const
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{ return !(*this == l); }
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} //namespace CGAL
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#endif // CGAL_LINEH2_H
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