mirror of https://github.com/CGAL/cgal
80 lines
2.1 KiB
C++
80 lines
2.1 KiB
C++
// ============================================================================
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//
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// Copyright (c) 1999 The CGAL Consortium
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//
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// This software and related documentation is part of an INTERNAL release
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// of the Computational Geometry Algorithms Library (CGAL). It is not
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// intended for general use.
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//
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// ----------------------------------------------------------------------------
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//
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// release :
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// release_date :
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//
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// file : include/CGAL/Triangulation_utils_3.h
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// revision : $Revision$
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// author(s) : Monique Teillaud <Monique.Teillaud@sophia.inria.fr>
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//
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// coordinator : INRIA Sophia Antipolis
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// (Mariette Yvinec <Mariette.Yvinec@sophia.inria.fr>)
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//
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// ============================================================================
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#ifndef CGAL_TRIANGULATION_UTILS_3_H
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#define CGAL_TRIANGULATION_UTILS_3_H
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#include <CGAL/triangulation_assertions.h>
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CGAL_BEGIN_NAMESPACE
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class Triangulation_utils_3
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{
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public:
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// inline unsigned int ccw(const unsigned int i) const
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// {
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// CGAL_precondition( i < 3 );
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// static const unsigned int tab_ccw[] = {1,2,0};
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// return tab_ccw[i];
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// }
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// inline unsigned int cw(const unsigned int i) const
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// {
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// CGAL_precondition( i < 3 );
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// static const unsigned int tab_cw[] = {2,0,1};
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// return tab_cw[i];
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// }
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inline int ccw(const int i) const
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{
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CGAL_triangulation_precondition( (0 <= i) && (i < 3) );
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return (i==2) ? 0 : i+1;
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}
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inline int cw(const int i) const
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{
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CGAL_triangulation_precondition( (0 <= i) || (i < 3) );
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return (i==0) ? 2 : i-1;
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}
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inline int nextposaround(const int i,
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const int j) const
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{
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// index of the next cell when turning around the
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// oriented edge vertex(i) vertex(j) in 3d
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CGAL_precondition( (0 <= i) && ( i < 4 ) &&
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(0 <= j) && ( j < 4 ) &&
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( i != j ) );
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static const int tab_nextposaroundij[4][4] = {
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{5, 2, 3, 1},
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{3, 5, 0, 2},
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{1, 3, 5, 0},
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{2, 0, 1, 5} }; // the diagonal has no meaning
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return tab_nextposaroundij[i][j];
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}
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};
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CGAL_END_NAMESPACE
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#endif // CGAL_TRIANGULATION_UTILS_3_H
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