mirror of https://github.com/CGAL/cgal
130 lines
3.0 KiB
C++
130 lines
3.0 KiB
C++
// Copyright (c) 1999 Utrecht University (The Netherlands),
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// ETH Zurich (Switzerland), Freie Universitaet Berlin (Germany),
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// INRIA Sophia-Antipolis (France), Martin-Luther-University Halle-Wittenberg
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// (Germany), Max-Planck-Institute Saarbruecken (Germany), RISC Linz (Austria),
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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; version 2.1 of the License.
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// See the file LICENSE.LGPL distributed with CGAL.
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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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//
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//
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// Author(s) : Stefan Schirra
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#ifndef CGAL_PREDICATES_ON_POINTSH3_H
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#define CGAL_PREDICATES_ON_POINTSH3_H
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#include <CGAL/Homogeneous/PointH3.h>
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namespace CGAL {
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template < class R >
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CGAL_KERNEL_MEDIUM_INLINE
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bool lexicographically_xy_smaller(const PointH3<R> &p,
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const PointH3<R> &q)
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{
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typedef typename R::RT RT;
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RT pV = p.hx()*q.hw();
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RT qV = q.hx()*p.hw();
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if ( pV < qV )
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{
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return true;
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}
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if ( qV < pV )
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{
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return false;
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}
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// same x
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pV = p.hy()*q.hw();
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qV = q.hy()*p.hw();
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if ( pV < qV )
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{
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return true;
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}
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return false;
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}
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template < class R>
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CGAL_KERNEL_MEDIUM_INLINE
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Comparison_result
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compare_xy(const PointH3<R>& p, const PointH3<R>& q)
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{
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typedef typename R::RT RT;
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RT pV = p.hx()*q.hw();
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RT qV = q.hx()*p.hw();
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if ( pV < qV )
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{
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return SMALLER;
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}
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if ( qV < pV ) // ( pV > qV )
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{
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return LARGER;
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}
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// same x
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pV = p.hy()*q.hw();
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qV = q.hy()*p.hw();
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if ( pV < qV )
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{
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return SMALLER;
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}
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if ( qV < pV ) // ( pV > qV )
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{
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return LARGER;
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}
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// same x and y
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return EQUAL;
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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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equal_xy(const PointH3<R> &p, const PointH3<R> &q)
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{
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return (p.hx() * q.hw() == q.hx() * p.hw() )
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&& (p.hy() * q.hw() == q.hy() * p.hw() );
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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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equal_xyz(const PointH3<R> &p, const PointH3<R> &q)
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{
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return (p.hx() * q.hw() == q.hx() * p.hw() )
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&& (p.hy() * q.hw() == q.hy() * p.hw() )
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&& (p.hz() * q.hw() == q.hz() * p.hw() );
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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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less_x(const PointH3<R> &p, const PointH3<R> &q)
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{ return (p.hx() * q.hw() < q.hx() * p.hw() ); }
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template < class R >
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CGAL_KERNEL_INLINE
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bool
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less_y(const PointH3<R> &p, const PointH3<R> &q)
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{ return (p.hy() * q.hw() < q.hy() * p.hw() ); }
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template < class R >
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CGAL_KERNEL_INLINE
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bool
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less_z(const PointH3<R> &p, const PointH3<R> &q)
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{ return (p.hz() * q.hw() < q.hz() * p.hw() ); }
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} //namespace CGAL
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#endif // CGAL_PREDICATES_ON_POINTSH3_H
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