1 #ifndef ALITRACKFITTER_H
2 #define ALITRACKFITTER_H
4 /*************************************************************************
5 * AliTrackFitter: base class for the fast track fitters *
7 * Supposed to be used for alignment framework *
8 * More information is available in
9 * http://agenda.cern.ch/askArchive.php?base=agenda&categ=a057717&id=a057717s1t6/transparencies
13 *************************************************************************/
16 #include <TMatrixDSymfwd.h>
18 #include "AliTrackPointArray.h"
19 #include "AliAlignObj.h"
23 class AliTrackFitter : public TObject {
28 AliTrackFitter(AliTrackPointArray *array, Bool_t owner = kTRUE);
29 AliTrackFitter(const AliTrackFitter &fitter);
30 AliTrackFitter& operator= (const AliTrackFitter& fitter);
31 virtual ~AliTrackFitter();
34 virtual void SetTrackPointArray(AliTrackPointArray *array, Bool_t owner = kTRUE);
35 virtual Bool_t Fit(const TArrayI *volIds,const TArrayI *volIdsFit = 0x0,
36 AliGeomManager::ELayerID layerRangeMin = AliGeomManager::kFirstLayer,
37 AliGeomManager::ELayerID layerRangeMax = AliGeomManager::kLastLayer);
39 virtual Bool_t Begin(Int_t, Int_t) = 0;
40 virtual Bool_t AddPoint(const AliTrackPoint *p) = 0;
41 virtual Bool_t Update() = 0;
43 virtual Bool_t GetPCA(const AliTrackPoint &pIn, AliTrackPoint &pOut) const = 0;
45 Bool_t FindVolId(const TArrayI *array, UShort_t volid) const;
47 void SetMinNPoints(Int_t n) { fMinNPoints = n;}
49 const Float_t* GetX() const {return fPoints->GetX();}
50 const Float_t* GetY() const {return fPoints->GetY();}
51 const Float_t* GetZ() const {return fPoints->GetZ();}
52 const Double_t* GetParam() const {return &fParams[0];}
53 const TMatrixDSym & GetCovariance() const {return *fCov;}
54 Float_t GetChi2() const {return fChi2;}
55 Int_t GetNdf() const {return fNdf;}
56 Int_t GetMinNPoints() const {return fMinNPoints;}
57 Float_t GetNormChi2() const { return (fNdf != 0) ? fChi2/fNdf : 0; }
58 void GetTrackResiduals(AliTrackPointArray*& pVolId, AliTrackPointArray*& pTrack) const
59 { pVolId = fPVolId; pTrack = fPTrack; }
63 Double_t fParams[6]; // Track parameters
64 TMatrixDSym *fCov; // Track cov matrix
65 AliTrackPointArray *fPoints; // Pointer to the array with track space points
66 AliTrackPointArray *fPVolId; // Pointer to the array with space-points in volId
67 AliTrackPointArray *fPTrack; // Pointer to the array with track extrapolation points in volId
68 Float_t fChi2; // Chi squared of the fit
69 Int_t fNdf; // Number of degrees of freedom
70 Int_t fMinNPoints; // Minimum allowed number of points
71 Bool_t fIsOwner; // Is the object owner of the space points array
75 ClassDef(AliTrackFitter,1) // Abstract class of fast track fitters