MeVisLab/Standard/Sources/ML/MLCSO/CSOTools/CSOMarchingSquaresCell.h

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// **InsertLicense** code
//----------------------------------------------------------------------------------

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

#ifndef __MSCell_H
#define __MSCell_H

#include "MLCSOIncludes.h"


ML_START_NAMESPACE

class CSOMarchingSquares;


// A cell consists of four voxel values, thus there are 16 possible configurations
// describing which voxel value is greater or lower than the isovalue.
// The cell configuration is saved as a bit set such that Bit 0 is set if the upper left
// corner is above the isovalue. See below for the mapping of nth bit to voxel position:
//
//   1--------2         2^0     2^1
//   |        |
//   |        |
//   |        |
//   |        |
//   8--------4         2^3     2^2


class MLCSO_EXPORT CSOMarchingSquaresCell
{

public:

  enum Direction {
    NONE   = 0, 
    LEFT   = 1, 
    TOP    = 2, 
    RIGHT  = 4, 
    BOTTOM = 8  
  };

  typedef std::vector<Vector2>    vecPoint2D;     
  typedef vecPoint2D::iterator vecPoint2DIter; 

  friend class CSOMarchingSquares; 

  CSOMarchingSquaresCell();
  ~CSOMarchingSquaresCell();

public:

  void reset();
  void set(int topLeftVoxel[2], float values[4], float isoValue);
  bool isAmbiguous() const;
  bool isIsoCell() const;
  int  getToDirection(int fromDir) const;
  bool addPoints(bool bIinterpolate, int fromDir, vecPoint2D& points, float xyOffset);

  bool operator != (CSOMarchingSquaresCell& rkCell) {
    return ((_cellConfig != rkCell._cellConfig) ||
      (_topLeftVoxel[0] != rkCell._topLeftVoxel[0]) ||
      (_topLeftVoxel[1] != rkCell._topLeftVoxel[1]));
  }

protected:

  unsigned char _cellConfig;
  int          _topLeftVoxel[2];
  float        _values[4];
  float        _isoValue;
  bool         _isBorder;
};


inline bool CSOMarchingSquaresCell::isAmbiguous() const 
{ 
  return (_cellConfig == 5) || (_cellConfig == 10); 
}


inline bool CSOMarchingSquaresCell::isIsoCell() const
{
  return (_cellConfig != 0) && (_cellConfig != 15);
}



ML_END_NAMESPACE


#endif // __MSCell_H