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//
//
// $Id$
//
// ----------------------------------------------------------------------
// Class G4GeometryCellStep
//
// Class description:
//
// This class serves to address the "cell" a track previously 
// touched and a "cell" a track is currently in. It is used 
// for scoring and importance sampling in the "mass" geometry as well 
// as in a "parallel" geometry. 
// The "cell" information is available with the GetPreGeometryCell and 
// the GetPostGeometryCell functions.
// The GetCrossBoundary finction returns true in case the step
// crosses a boundary in the geometry this G4GeometryCellStep 
// refers to.

// Author: Michael Dressel (Michael.Dressel@cern.ch)
// ----------------------------------------------------------------------
#ifndef G4GeometryCellStep_hh
#define G4GeometryCellStep_hh G4GeometryCellStep_hh

#include "G4GeometryCell.hh"

class G4GeometryCellStep
{
public: // with description
  G4GeometryCellStep(const G4GeometryCell &preCell, 
	  const G4GeometryCell &postCell);
    // initialise pre and post G4GeometryCell 

  ~G4GeometryCellStep();

  const G4GeometryCell &GetPreGeometryCell() const; 
    // addressing the  "cell" the track previously touched 

  const G4GeometryCell &GetPostGeometryCell() const; 
    // addressing the current "cell"  

  G4bool GetCrossBoundary() const; 
    // returns true if step crosses boundary of the geometry it refers to

  // the following functions are used by the scoring and importance
  // system to set the cell information.
  void SetPreGeometryCell(const G4GeometryCell &preCell); 
    
  void SetPostGeometryCell(const G4GeometryCell &postCell);
  
  void SetCrossBoundary(G4bool b);

private:
  G4GeometryCell fPreGeometryCell;
  G4GeometryCell fPostGeometryCell;  
  G4bool fCrossBoundary;

};



inline void G4GeometryCellStep::SetPreGeometryCell(const G4GeometryCell &preCell) 
{
  fPreGeometryCell = preCell;
}

inline void G4GeometryCellStep::SetPostGeometryCell(const G4GeometryCell &postCell)  
{
  fPostGeometryCell = postCell;
}
  
inline void G4GeometryCellStep::SetCrossBoundary(G4bool b) 
{
  fCrossBoundary = b;
}

inline const G4GeometryCell &G4GeometryCellStep::GetPreGeometryCell() const 
{
  return fPreGeometryCell;
}

inline const G4GeometryCell &G4GeometryCellStep::GetPostGeometryCell() const 
{
  return fPostGeometryCell;
}
  
inline G4bool G4GeometryCellStep::GetCrossBoundary() const 
{
  return fCrossBoundary;
}


#endif