#ifndef ROOT_THaVDCAnalyticTTDConv
#define ROOT_THaVDCAnalyticTTDConv

///////////////////////////////////////////////////////////////////////////////
//                                                                           //
// THaVDCAnalyticTTDConv                                                     //
//                                                                           //
// Uses a drift velocity (um/ns) to convert time (ns) into distance (cm)     //
//                                                                           //
///////////////////////////////////////////////////////////////////////////////
#include "THaVDCTimeToDistConv.h"

class THaVDCAnalyticTTDConv : public THaVDCTimeToDistConv{

public:
  THaVDCAnalyticTTDConv( );
  THaVDCAnalyticTTDConv(Double_t vel);

  virtual ~THaVDCAnalyticTTDConv();

  virtual Double_t ConvertTimeToDist(Double_t time, Double_t tanTheta,
				     Double_t *ddist=0);


  // Get and Set Functions
  Double_t GetDriftVel() { return fDriftVel; }

  void SetDriftVel(Double_t v) {fDriftVel = v; }
  void SetParameters( const Double_t* A1, const Double_t* A2, Double_t dtime );

protected:

  Double_t fDriftVel;   // Drift velocity (m/s)

  // Coefficients for a polynomial yielding correction parameters
  Double_t fA1tdcCor[4];
  Double_t fA2tdcCor[4];

  Double_t fdtime;      // uncertainty in the measured time
  Bool_t   fIsSet;      // Flag to indicate that parameters are set

  ClassDef(THaVDCAnalyticTTDConv,0)             // VDC Analytic TTD Conv class
};


////////////////////////////////////////////////////////////////////////////////

#endif