138 lines
4.2 KiB
C
138 lines
4.2 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); 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; either version 3 of the License,
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// or (at your option) any later version.
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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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// SPDX-License-Identifier: LGPL-3.0+
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//
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//
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// Author(s) : Stefan Schirra
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#ifndef CGAL_HOMOGENEOUS_DIRECTION_3_H
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#define CGAL_HOMOGENEOUS_DIRECTION_3_H
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#include <CGAL/kernel_config.h>
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#include <CGAL/array.h>
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#include <CGAL/Handle_for.h>
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#include <CGAL/number_utils.h>
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namespace CGAL {
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template < class R_ >
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class DirectionH3
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{
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typedef typename R_::RT RT;
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typedef typename R_::FT FT;
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typedef typename R_::Point_3 Point_3;
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typedef typename R_::Vector_3 Vector_3;
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typedef typename R_::Segment_3 Segment_3;
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typedef typename R_::Line_3 Line_3;
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typedef typename R_::Ray_3 Ray_3;
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typedef cpp11::array<RT, 4> 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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DirectionH3() {}
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//DirectionH3(const Point_3 & p )
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//: base(p) {}
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DirectionH3(const Vector_3 & v )
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{ *this = v.direction(); }
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DirectionH3(const Line_3 & l )
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{ *this = l.rep().direction(); }
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DirectionH3(const Ray_3 & r )
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{ *this = r.direction(); }
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DirectionH3(const Segment_3 & s )
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{ *this = s.direction(); }
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// the fourth argument is not documented. Should go away ?
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DirectionH3(const RT& x, const RT& y,
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const RT& z, const RT& w = RT(1) )
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: base( w >= RT(0) ? CGAL::make_array(x, y, z, w)
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: CGAL::make_array<RT>(-x, -y, -z, -w) ) {}
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bool is_degenerate() const;
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bool operator==( const DirectionH3<R>& d) const;
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bool operator!=( const DirectionH3<R>& d) const;
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Vector_3 to_vector() const;
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Vector_3 vector() const { return to_vector(); }
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const RT & dx() const { return get_pointee_or_identity(base)[0]; }
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const RT & dy() const { return get_pointee_or_identity(base)[1]; }
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const RT & dz() const { return get_pointee_or_identity(base)[2]; }
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const RT & x() const { return get_pointee_or_identity(base)[0]; }
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const RT & y() const { return get_pointee_or_identity(base)[1]; }
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const RT & z() const { return get_pointee_or_identity(base)[2]; }
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const RT & hx() const { return get_pointee_or_identity(base)[0]; }
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const RT & hy() const { return get_pointee_or_identity(base)[1]; }
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const RT & hz() 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_INLINE
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bool
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DirectionH3<R>::operator==( const DirectionH3<R>& d) const
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{
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return ( ( hx()*d.hy() == hy()*d.hx() )
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&&( hx()*d.hz() == hz()*d.hx() )
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&&( hy()*d.hz() == hz()*d.hy() )
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&&( CGAL_NTS sign( hx() ) == CGAL_NTS sign( d.hx() ) )
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&&( CGAL_NTS sign( hy() ) == CGAL_NTS sign( d.hy() ) )
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&&( CGAL_NTS sign( hz() ) == CGAL_NTS sign( d.hz() ) ) );
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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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DirectionH3<R>::operator!=( const DirectionH3<R>& d) const
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{ return !operator==(d); }
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template <class R >
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CGAL_KERNEL_INLINE
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bool
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DirectionH3<R>::is_degenerate() const
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{ return ((hx() == RT(0)) && (hy() == RT(0)) && (hz() == RT(0))); }
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template <class R >
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inline
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typename DirectionH3<R>::Vector_3
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DirectionH3<R>::to_vector() const
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{ return Vector_3(dx(), dy(), dz(), RT(1)); }
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template <class R>
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CGAL_KERNEL_INLINE
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DirectionH3<R>
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cross_product( const DirectionH3<R>& d1,
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const DirectionH3<R>& d2)
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{ return cross_product(d1.to_vector(),d2.to_vector()).direction(); }
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} //namespace CGAL
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#endif // CGAL_HOMOGENEOUS_DIRECTION_3_H
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