#ifndef ALITRACKFITTERSTRAIGHT_H
#define ALITRACKFITTERSTRAIGHT_H

#include "AliTrackFitter.h"

class AliTrackFitterStraight : public AliTrackFitter{
 public:
  AliTrackFitterStraight();
  AliTrackFitterStraight(AliTrackPointArray *array, Bool_t owner = kTRUE);
  AliTrackFitterStraight(const AliTrackFitterStraight &fitter);
  AliTrackFitterStraight &operator =(const AliTrackFitterStraight& fitter);
  virtual ~AliTrackFitterStraight();

  Bool_t Fit(const TArrayI *volIdx,const TArrayI *volIdsFit = 0x0,
	     AliGeomManager::ELayerID layerRangeMin = AliGeomManager::kFirstLayer,
	     AliGeomManager::ELayerID layerRangeMax = AliGeomManager::kLastLayer);
  Bool_t GetPCA(const AliTrackPoint &p, AliTrackPoint &p2) const;

  void Reset();
  void AddPoint(Float_t x, Float_t y, Float_t z, Float_t sy, Float_t sz);
  Bool_t Update();

  //  Double_t GetC(); 
  Double_t GetYat(Double_t x) const;
  Double_t GetZat(Double_t x) const;
  Double_t GetDYat(Double_t x) const;
  Double_t GetDZat(Double_t x) const;
  Bool_t   GetXYZat(Double_t r, Float_t *xyz) const;

 protected:

  Double_t      fAlpha;     //angle to transform to the fitting coordinate system
  Double_t      fSumXY[5];  //sums for XY part
  Double_t      fSumYY;     //sum for YY part
  Double_t      fSumXZ[5];  //sums for XZ part
  Double_t      fSumZZ;     //sum for ZZ part
  Int_t         fNUsed;     //actual number of space-points used in the fit
  Bool_t        fConv;      // indicates convergation

 private:
  Bool_t Begin(Int_t, Int_t) {Reset(); return kTRUE;}
  Bool_t AddPoint(const AliTrackPoint *) {return kTRUE;}

  ClassDef(AliTrackFitterStraight,1)  // Fast fit of straight tracks

};

#endif