AddTaskFemto for train update
[u/mrichter/AliRoot.git] / ITS / AliITStrackerSA.h
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1#ifndef ALIITSTRACKERSA_H
2#define ALIITSTRACKERSA_H
3
4
5
6#include "AliITSgeomTGeo.h"
7#include "AliITStrackerMI.h"
8
9/* Copyright(c) 1998-2003, ALICE Experiment at CERN, All rights reserved. *
10 * See cxx source for full Copyright notice */
11
12/* $Id$ */
13
14
15////////////////////////////////////////////////////
16// Stand alone tracker class //
17// Origin: Elisabetta Crescio //
18// e-mail: crescio@to.infn.it //
19// adapted for cosmics by A.Dainese //
20////////////////////////////////////////////////////
21
22class AliITSclusterTable;
23class AliITStrackSA;
24class AliESDVertex;
25class AliESDEvent;
26class AliITSVertexer;
27class TTree;
28class TArrayD;
29
30class AliITStrackerSA : public AliITStrackerMI {
31
32
33 public:
34
35 AliITStrackerSA();
36 AliITStrackerSA(const Char_t *geom);
37 virtual ~AliITStrackerSA();
38 virtual Int_t Clusters2Tracks(AliESDEvent *event);
39 Int_t FindTracks(AliESDEvent* event, Bool_t useAllClusters=kFALSE);
40
41 AliITStrackV2* FitTrack(AliITStrackSA* tr,Double_t* primaryVertex,Bool_t onePoint=kFALSE);
42 void StoreTrack(AliITStrackV2 *t,AliESDEvent *event, Bool_t pureSA) const;
43 Int_t FindTrackLowChiSquare() const;
44 Int_t LoadClusters(TTree *cf) {Int_t rc=AliITStrackerMI::LoadClusters(cf); SetClusterTree(cf); return rc;}
45
46 void SetClusterTree(TTree * itscl){fITSclusters = itscl;}
47
48 void SetOutwardFinding() {fInwardFlag=kFALSE;}
49 void SetInwardFinding() {fInwardFlag=kTRUE;}
50 void SetOuterStartLayer(Int_t osl = 0) {
51 if(osl>(AliITSgeomTGeo::GetNLayers()-2)) AliWarning("Minimum Number of layers is 2. OuterStartLayer set to Nlayers-2");
52 fOuterStartLayer = TMath::Min(AliITSgeomTGeo::GetNLayers()-2,osl);
53 }
54 Int_t GetOuterStartLayer() const {return fOuterStartLayer;}
55 void SetInnerStartLayer(Int_t isl = 5) {
56 if(isl<1) AliWarning("Minimum Number of layers is 2. InnerStartLayer set to 1");
57 fInnerStartLayer = TMath::Max(1,isl);
58 }
59 Int_t GetInnerStartLayer() const {return fInnerStartLayer;}
60
61 void SetSAFlag(Bool_t fl){fITSStandAlone=fl;} // StandAlone flag setter
62 Bool_t GetSAFlag() const {return fITSStandAlone;} // StandAlone flag getter
63 void SetFixedWindowSizes(Int_t n=46, Double_t *phi=0, Double_t *lam=0);
64 void SetCalculatedWindowSizes(Int_t n=10, Double_t phimin=0.002, Double_t phimax=0.0145, Double_t lambdamin=0.003, Double_t lambdamax=0.008);
65
66 void SetMinNPoints(Int_t np){fMinNPoints=np;}
67 Int_t GetMinNPoints() const {return fMinNPoints;}
68 void SetMinimumChargeSDDSSD(Double_t minq=0.){fMinQ=minq;}
69 enum {kSAflag=0x8000}; //flag to mark clusters used in the SA tracker
70 protected:
71
72 //Initialization
73 void Init();
74 void ResetForFinding();
75 void UpdatePoints();
76 Bool_t SetFirstPoint(Int_t lay, Int_t clu, Double_t* primaryVertex);
77 static Double_t Curvature(Double_t x1,Double_t y1,Double_t x2,Double_t y2,
78 Double_t x3,Double_t y3);
79
80 Double_t ChoosePoint(Double_t p1, Double_t p2, Double_t pp);
81
82 static Int_t FindIntersection(Double_t a1, Double_t b1, Double_t c1, Double_t c2,
83 Double_t& x1,Double_t& y1, Double_t& x2, Double_t& y2);
84 static Int_t FindEquation(Double_t x1, Double_t y1, Double_t x2, Double_t y2,
85 Double_t x3, Double_t y3,Double_t& a, Double_t& b,
86 Double_t& c);
87
88 Int_t FindLabel(AliITStrackV2* track);
89 Int_t SearchClusters(Int_t layer,Double_t phiwindow,Double_t lambdawindow,
90 AliITStrackSA* trs,Double_t zvertex,Int_t flagp);
91
92 void GetCoorAngles(AliITSRecPoint* cl,Double_t &phi,Double_t &lambda,Double_t &x,Double_t &y,Double_t &z,const Double_t* vertex);
93 void GetCoorErrors(AliITSRecPoint* cl,Double_t &sx,Double_t &sy, Double_t &sz);
94
95 AliITSclusterTable* GetClusterCoord(Int_t layer,Int_t n) const {return (AliITSclusterTable*)fCluCoord[layer]->UncheckedAt(n);}
96 void RemoveClusterCoord(Int_t layer, Int_t n) {fCluCoord[layer]->RemoveAt(n);fCluCoord[layer]->Compress();}
97
98 Int_t FindIndex(Int_t lay, Double_t lamMin) const;
99
100 Double_t fPhiEstimate; //Estimation of phi angle on next layer
101 Bool_t fITSStandAlone; //Tracking is performed in the ITS alone if kTRUE
102 Double_t fPoint1[2]; //! coord. of 1-st point to evaluate the curvature
103 Double_t fPoint2[2]; //! coord. of 2-nd point to evaluate the curvature
104 Double_t fPoint3[2]; //! coord. of 3-rd point to evaluate the curvature
105 Double_t fPointc[2]; //! current point coord (for curvature eval.)
106 Double_t fLambdac; //! current value of the Lambda angle in the window
107 Double_t fPhic; //! current value of the Phi angle in the window
108 Double_t fCoef1; //! param. of the equation of the circ. approx a layer
109 Double_t fCoef2; //! param. of the equation of the circ. approx a layer
110 Double_t fCoef3; //! param. of the equation of the circ. approx a layer
111 Int_t fNloop; // Number of iterqations on phi and lambda windows
112 Double_t *fPhiWin; // phi window sizes
113 Double_t *fLambdaWin; // lambda window sizes
114 TClonesArray *fListOfTracks; //! container for found tracks
115 TClonesArray *fListOfSATracks; //! container for found SA tracks
116 TTree *fITSclusters; //! pointer to ITS tree of clusters
117 Bool_t fInwardFlag; // set to kTRUE for inward track finding
118 Int_t fOuterStartLayer; // Outward search for tracks with <6 points: outer layer to start from
119 Int_t fInnerStartLayer; // Inward search for tracks with <6 points: inner layer to start from
120 Int_t fMinNPoints; // minimum number of clusters for a track
121 Double_t fMinQ; // lower cut on cluster charge (SDD and SSD)
122
123 TClonesArray** fCluCoord; //! array with cluster info
124
125 private:
126 AliITStrackerSA(const AliITStrackerSA& tracker);
127 AliITStrackerSA& operator=(const AliITStrackerSA& source);
128
129 ClassDef(AliITStrackerSA,12)
130};
131
132#endif
133
134