//
//  Filename         : Nature.h
//  Author(s)        : Emmanuel Turquin
//  Purpose          : Different natures for both vertices and edges
//  Date of creation : 01/07/2003
//
///////////////////////////////////////////////////////////////////////////////


//
//  Copyright (C) : Please refer to the COPYRIGHT file distributed 
//   with this source distribution. 
//
//  This program is free software; you can redistribute it and/or
//  modify it under the terms of the GNU General Public License
//  as published by the Free Software Foundation; either version 2
//  of the License, or (at your option) any later version.
//
//  This program is distributed in the hope that it will be useful,
//  but WITHOUT ANY WARRANTY; without even the implied warranty of
//  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
//  GNU General Public License for more details.
//
//  You should have received a copy of the GNU General Public License
//  along with this program; if not, write to the Free Software
//  Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
//
///////////////////////////////////////////////////////////////////////////////

#ifndef  NATURE_H
# define NATURE_H

/*! \file Nature.h
 *  Definitions of Natures of the ViewMap's elements
 */

/*! Namespace gathering the different possible 
 *  natures of 0D and 1D elements of the ViewMap
 */
namespace Nature {
  
  typedef unsigned short VertexNature;

  /*! true for any 0D element */
  static const VertexNature POINT		= 0;		// 0
  /*! true for SVertex */
  static const VertexNature S_VERTEX		= (1 << 0);	// 1
  /*! true for ViewVertex */
  static const VertexNature VIEW_VERTEX		= (1 << 1);	// 2
  /*! true for NonTVertex */
  static const VertexNature NON_T_VERTEX	= (1 << 2);	// 4
  /*! true for TVertex */
  static const VertexNature T_VERTEX		= (1 << 3);	// 8
  /*! true for CUSP */
  static const VertexNature CUSP		= (1 << 4);	// 16

  typedef unsigned short EdgeNature;
  /*! true for non feature edges (always false for 1D elements of the ViewMap) */
  static const EdgeNature NO_FEATURE		= 0;		// 0
  /*! true for silhouettes */
  static const EdgeNature SILHOUETTE		= (1 << 0);	// 1
  /*! true for borders */
  static const EdgeNature BORDER		= (1 << 1);	// 2
  /*! true for creases */
  static const EdgeNature CREASE		= (1 << 2);	// 4
  /*! true for ridges */
  static const EdgeNature RIDGE			= (1 << 3);	// 8
  /*! true for valleys */
  static const EdgeNature VALLEY		= (1 << 4);	// 16
  /*! true for suggestive contours */
  static const EdgeNature SUGGESTIVE_CONTOUR	= (1 << 5);	// 32

} // end of namespace Nature

#endif // NATURE_H