1 #ifndef ALIITSTRACKERSA_H
2 #define ALIITSTRACKERSA_H
6 #include "AliITStrackerMI.h"
8 /* Copyright(c) 1998-2003, ALICE Experiment at CERN, All rights reserved. *
9 * See cxx source for full Copyright notice */
11 ////////////////////////////////////////////////////
12 // Stand alone tracker class //
13 // Origin: Elisabetta Crescio //
14 // e-mail: crescio@to.infn.it //
15 ////////////////////////////////////////////////////
17 class AliITSclusterTable;
25 class AliITStrackerSA : public AliITStrackerMI {
31 AliITStrackerSA(const Char_t *geom);
32 AliITStrackerSA(const Char_t *geom,AliESDVertex *vert);
33 AliITStrackerSA(const Char_t *geom,AliITSVertexer *vertexer);
34 AliITStrackerSA(const AliITStrackerSA& tracker);
35 AliITStrackerSA& operator=(const AliITStrackerSA& source);
36 virtual ~AliITStrackerSA();
37 virtual Int_t Clusters2Tracks(AliESDEvent *event);
38 Int_t FindTracks(AliESDEvent* event);
40 AliITStrackV2* FitTrack(AliITStrackSA* tr,Double_t* primaryVertex);
41 AliITStrackV2* FitShortTrack(AliITStrackSA* tr,Double_t *primaryVertex,Int_t innLay);
42 Int_t FindTrackLowChiSquare(TObjArray* tracklist, Int_t dim) const;
43 Int_t LoadClusters(TTree *cf) {Int_t rc=AliITStrackerMI::LoadClusters(cf); SetClusterTree(cf); SetSixPoints(kTRUE); return rc;}
44 void SetVertex(AliESDVertex *vtx){fVert = vtx;}
45 void SetClusterTree(TTree * itscl){fITSclusters = itscl;}
46 void SetSixPoints(Bool_t sp = kFALSE){fSixPoints = sp;}
47 Bool_t GetSixPoints() const {return fSixPoints;}
48 void SetOuterStartLayer(Int_t osl = 0) {if(osl>(AliITSgeomTGeo::GetNLayers()-2)) osl=AliITSgeomTGeo::GetNLayers()-2; fOuterStartLayer = osl;}
49 Int_t GetOuterStartLayer() const {return fOuterStartLayer;}
50 void SetSAFlag(Bool_t fl){fITSStandAlone=fl;} // StandAlone flag setter
51 Bool_t GetSAFlag() const {return fITSStandAlone;} // StandAlone flag getter
52 void SetWindowSizes(Int_t n=46, Double_t *phi=0, Double_t *lam=0);
54 enum {kSAflag=0x8000}; //flag to mark clusters used in the SA tracker
60 void ResetForFinding();
63 static Double_t Curvature(Double_t x1,Double_t y1,Double_t x2,Double_t y2,
64 Double_t x3,Double_t y3);
66 Double_t ChoosePoint(Double_t p1, Double_t p2, Double_t pp);
68 static Int_t FindIntersection(Float_t a1, Float_t b1, Float_t c1, Float_t c2,
69 Float_t& x1,Float_t& y1, Float_t& x2, Float_t& y2);
70 static Int_t FindEquation(Float_t x1, Float_t y1, Float_t x2, Float_t y2,
71 Float_t x3, Float_t y3,Float_t& a, Float_t& b,
74 static Int_t FindLabel(Int_t l1, Int_t l2, Int_t l3, Int_t l4, Int_t l5, Int_t l6);
75 static Int_t Label(Int_t gl1, Int_t gl2, Int_t gl3, Int_t gl4, Int_t gl5,
76 Int_t gl6,Int_t gl7, Int_t gl8, Int_t gl9, Int_t gl10,Int_t gl11,
77 Int_t gl12, Int_t gl13, Int_t gl14,Int_t gl15, Int_t gl16,
78 Int_t gl17, Int_t gl18, Int_t numberofpoints=6);
80 Int_t SearchClusters(Int_t layer,Double_t phiwindow,Double_t lambdawindow,
81 AliITStrackSA* trs,Double_t zvertex,Int_t flagp);
83 void GetCoorAngles(AliITSRecPoint* cl,Double_t &phi,Double_t &lambda,Float_t &x,Float_t &y,Float_t &z,Double_t* vertex);
84 void GetCoorErrors(AliITSRecPoint* cl,Float_t &sx,Float_t &sy, Float_t &sz);
86 AliITSclusterTable* GetClusterCoord(Int_t layer,Int_t n) const {return (AliITSclusterTable*)fCluCoord[layer]->UncheckedAt(n);}
87 void RemoveClusterCoord(Int_t layer, Int_t n) {fCluCoord[layer]->RemoveAt(n);fCluCoord[layer]->Compress();}
90 Double_t fPhiEstimate; //Estimation of phi angle on next layer
91 Bool_t fITSStandAlone; //Tracking is performed in the ITS alone if kTRUE
92 Float_t fPoint1[2]; //! coord. of 1-st point to evaluate the curvature
93 Float_t fPoint2[2]; //! coord. of 2-nd point to evaluate the curvature
94 Float_t fPoint3[2]; //! coord. of 3-rd point to evaluate the curvature
95 Float_t fPointc[2]; //! current point coord (for curvature eval.)
96 Double_t fLambdac; //! current value of the Lambda angle in the window
97 Double_t fPhic; //! current value of the Phi angle in the window
98 Float_t fCoef1; //! param. of the equation of the circ. approx a layer
99 Float_t fCoef2; //! param. of the equation of the circ. approx a layer
100 Float_t fCoef3; //! param. of the equation of the circ. approx a layer
101 Int_t fNloop; // Number of iterqations on phi and lambda windows
102 Double_t *fPhiWin; // phi window sizes
103 Double_t *fLambdaWin; // lambda window sizes
104 AliESDVertex *fVert; //! primary vertex
105 AliITSVertexer *fVertexer; //! vertexer
106 TObjArray *fListOfTracks; //! container for found tracks
107 TTree *fITSclusters; //! pointer to ITS tree of clusters
108 Bool_t fSixPoints; // If true 6/6 points are required (default). 5/6 otherwise
109 Int_t fOuterStartLayer; // Search for tracks with <6 points: outer layer to start from
111 TClonesArray** fCluLayer; //! array with clusters
112 TClonesArray** fCluCoord; //! array with cluster info
114 ClassDef(AliITStrackerSA,6)