/usr/include/CGAL/Homogeneous/DirectionH3.h is in libcgal-dev 4.11-2build1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 | // 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); you can redistribute it and/or
// modify it under the terms of the GNU Lesser General Public License as
// published by the Free Software Foundation; either version 3 of the License,
// or (at your option) any later version.
//
// Licensees holding a valid commercial license may use this file in
// accordance with the commercial license agreement provided with the software.
//
// This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
// WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
//
// $URL$
// $Id$
//
//
// Author(s) : Stefan Schirra
#ifndef CGAL_HOMOGENEOUS_DIRECTION_3_H
#define CGAL_HOMOGENEOUS_DIRECTION_3_H
#include <CGAL/kernel_config.h>
#include <CGAL/array.h>
#include <CGAL/Handle_for.h>
#include <CGAL/number_utils.h>
namespace CGAL {
template < class R_ >
class DirectionH3
{
typedef typename R_::RT RT;
typedef typename R_::FT FT;
typedef typename R_::Point_3 Point_3;
typedef typename R_::Vector_3 Vector_3;
typedef typename R_::Segment_3 Segment_3;
typedef typename R_::Line_3 Line_3;
typedef typename R_::Ray_3 Ray_3;
typedef cpp11::array<RT, 4> Rep;
typedef typename R_::template Handle<Rep>::type Base;
Base base;
public:
typedef R_ R;
DirectionH3() {}
//DirectionH3(const Point_3 & p )
//: base(p) {}
DirectionH3(const Vector_3 & v )
{ *this = v.direction(); }
DirectionH3(const Line_3 & l )
{ *this = l.rep().direction(); }
DirectionH3(const Ray_3 & r )
{ *this = r.direction(); }
DirectionH3(const Segment_3 & s )
{ *this = s.direction(); }
// the fourth argument is not documented. Should go away ?
DirectionH3(const RT& x, const RT& y,
const RT& z, const RT& w = RT(1) )
: base( w >= RT(0) ? CGAL::make_array(x, y, z, w)
: CGAL::make_array<RT>(-x, -y, -z, -w) ) {}
bool is_degenerate() const;
bool operator==( const DirectionH3<R>& d) const;
bool operator!=( const DirectionH3<R>& d) const;
Vector_3 to_vector() const;
Vector_3 vector() const { return to_vector(); }
const RT & dx() const { return get_pointee_or_identity(base)[0]; }
const RT & dy() const { return get_pointee_or_identity(base)[1]; }
const RT & dz() const { return get_pointee_or_identity(base)[2]; }
const RT & x() const { return get_pointee_or_identity(base)[0]; }
const RT & y() const { return get_pointee_or_identity(base)[1]; }
const RT & z() const { return get_pointee_or_identity(base)[2]; }
const RT & hx() const { return get_pointee_or_identity(base)[0]; }
const RT & hy() const { return get_pointee_or_identity(base)[1]; }
const RT & hz() const { return get_pointee_or_identity(base)[2]; }
};
template <class R >
CGAL_KERNEL_INLINE
bool
DirectionH3<R>::operator==( const DirectionH3<R>& d) const
{
return ( ( hx()*d.hy() == hy()*d.hx() )
&&( hx()*d.hz() == hz()*d.hx() )
&&( hy()*d.hz() == hz()*d.hy() )
&&( CGAL_NTS sign( hx() ) == CGAL_NTS sign( d.hx() ) )
&&( CGAL_NTS sign( hy() ) == CGAL_NTS sign( d.hy() ) )
&&( CGAL_NTS sign( hz() ) == CGAL_NTS sign( d.hz() ) ) );
}
template <class R >
inline
bool
DirectionH3<R>::operator!=( const DirectionH3<R>& d) const
{ return !operator==(d); }
template <class R >
CGAL_KERNEL_INLINE
bool
DirectionH3<R>::is_degenerate() const
{ return ((hx() == RT(0)) && (hy() == RT(0)) && (hz() == RT(0))); }
template <class R >
inline
typename DirectionH3<R>::Vector_3
DirectionH3<R>::to_vector() const
{ return Vector_3(dx(), dy(), dz(), RT(1)); }
template <class R>
CGAL_KERNEL_INLINE
DirectionH3<R>
cross_product( const DirectionH3<R>& d1,
const DirectionH3<R>& d2)
{ return cross_product(d1.to_vector(),d2.to_vector()).direction(); }
} //namespace CGAL
#endif // CGAL_HOMOGENEOUS_DIRECTION_3_H
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