// -------------------------------------------------------------------------
// -----                PndDchDrifter header file                      -----
// -----                Created 03/08/07  by P. Hawranek               -----
// -------------------------------------------------------------------------

/** \class PndDchDrifter
 *  \author P.Hawranek
 *  \date 03/08/07
 *  \brief Class for conversion drift time to distance
 * 
 *     The class serves for recalculation of measured drift time 
 *     to distance to the sense wire and vice versa.
 *     It is used for digitisation and spatial reconstruction of tracks.
 **/


#ifndef PNDDCHDRIFTER_H
#define PNDDCHDRIFTER_H

// ROOT includes
#include "TString.h"
#include "TObject.h"
// c++ includes
#include <vector> 

class PndDchDrifter: public TObject {
 public:
  /** Public method Instance()
   ** for access to a singleton object
   **/
  static PndDchDrifter* Instance();
  
  /** Public method Instance(...)
   ** for access to a singleton object for the first time
   **/
  static PndDchDrifter* Instance(TString filename, Double_t cellsize);
  
  /** Destructor **/
  ~PndDchDrifter(){;}
  
  /** Public method CalculateDriftTime(...)
      calculates drift time from distance
  **/
  Bool_t CalculateDriftTime(Double_t &time, Double_t distance) const ;


  /** Public method CalculateDistance(...)
      calculates distance from drift time 
  **/
  Bool_t CalculateDistance(Double_t time, Double_t &distance) const ;

  void    Print(const Option_t* option="") const;
  
 protected:
  /** Constructor of the singleton object **/
  PndDchDrifter(TString fileName, Double_t cellSize);
  
 private:
  Double_t fCellSize;               ///< cell size in cm
  Int_t fNumberOfPoints;            ///< number of points used in calibration
  std::vector<Double_t> fDriftTime; ///< driftTime array in calibration
  std::vector<Double_t> fDistance;  ///< array of distances from the wire in calibration
  static PndDchDrifter* fgDrifterInstance; ///< pointer to the singleton object
  
  ClassDef(PndDchDrifter,1)
};

#endif