/*===========================================================================*\
 *                                                                           *
 *                                IsoEx                                      *
 *        Copyright (C) 2002 by Computer Graphics Group, RWTH Aachen         *
 *                         www.rwth-graphics.de                              *
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 *---------------------------------------------------------------------------* 
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 *                                License                                    *
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 *  This library is free software; you can redistribute it and/or modify it  *
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 *  by the Free Software Foundation, version 2.                              *
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 *  This library 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        *
 *  Library General Public License for more details.                         *
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 *  You should have received a copy of the GNU Library General Public        *
 *  License along with this library; if not, write to the Free Software      *
 *  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.                *
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\*===========================================================================*/

//=============================================================================
//
//  CLASS ExtendedMarchingCubesT
//
//=============================================================================


#ifndef ISOEX_EXTMARCHINGCUBEST_HH
#define ISOEX_EXTMARCHINGCUBEST_HH


//== INCLUDES =================================================================

#include <IsoEx/Extractors/Edge2VertexMapT.hh>
#include <IsoEx/Grids/Grid.hh>
#include <vector>

//== NAMESPACES ===============================================================

namespace IsoEx {

//== CLASS DEFINITION =========================================================


/** \class ExtendedMarchingCubesT ExtendedMarchingCubesT.hh <IsoEx/Extractors/ExtendedMarchingCubesT.hh>

    This class implements the Extended Marching Cubes of Kobbelt et al, 
    Siggraph 2001.

    The 0-level iso-surface is extracted in the constructor. Use it through 
    the convenience function 
    <b>IsoEx::extended_marching_cubes()</b>.

    \ingroup extractors
*/	      
template <class Mesh, class Grid>
class ExtendedMarchingCubesT
{
public:
   
  ExtendedMarchingCubesT(const Grid&  _grid,
			 Mesh&        _mesh,
             double      _iso_value,
			 double       _feature_angle);

  
private:

  typedef typename Grid::PointIdx        PointIdx;
  typedef typename Grid::CubeIdx         CubeIdx;
  typedef typename Grid::CubeIterator    CubeIterator;
  typedef typename Mesh::VertexHandle    VertexHandle;
  typedef std::vector<VertexHandle>      VertexHandleVector;
  

  void process_cube(CubeIdx _idx, double _iso_value);

  VertexHandle add_vertex(PointIdx _p0, PointIdx _p1, double _iso_value);
  VertexHandle find_feature(const VertexHandleVector& _vhandles);

  void flip_edges();



  const Grid&      grid_;
  Mesh&            mesh_;

  float            feature_angle_;
  unsigned int     n_edges_, n_corners_;

  // maps an edge to the sample vertex generated on it
  Edge2VertexMapT<PointIdx, VertexHandle> edge2vertex_;
};


//-----------------------------------------------------------------------------


/** Convenience wrapper for the Extended Marching Cubes algorithm.
    \see IsoEx::ExtendedMarchingCubesT
    \ingroup extractors
*/	      
template <class Mesh, class Grid>
void extended_marching_cubes(const Grid&  _grid,
			     Mesh&        _mesh,
                 double      _iso_value,
			     double       _feature_angle)
{
  ExtendedMarchingCubesT<Mesh,Grid> emc(_grid, _mesh, _iso_value, _feature_angle);
}


//=============================================================================
} // namespace IsoEx
//=============================================================================
#if defined(INCLUDE_TEMPLATES) && !defined(ISOEX_EXTMARCHINGCUBEST_C)
#define ISOEX_EXTMARCHINGCUBEST_TEMPLATES
#include "ExtendedMarchingCubesT.cc"
#endif
//=============================================================================
#endif // ISOEX_EXTMARCHINGCUBEST_HH defined
//=============================================================================