Uncertainty of the tracking step included (Yu.Belikov)
[u/mrichter/AliRoot.git] / ITS / AliITStrackerV2.h
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006b5f7f 1#ifndef ALIITSTRACKER_H
2#define ALIITSTRACKER_H
3/* Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. *
4 * See cxx source for full Copyright notice */
5
6//-------------------------------------------------------------------------
7// ITS tracker
8//
9// Origin: Iouri Belikov, CERN, Jouri.Belikov@cern.ch
10//-------------------------------------------------------------------------
11#include "AliTracker.h"
12#include "AliITSrecoV2.h"
13#include "AliITStrackV2.h"
14
15class AliITSclusterV2;
16class AliITSgeom;
17class TFile;
18
19
20//-------------------------------------------------------------------------
21class AliITStrackerV2 : public AliTracker {
22public:
23 AliITStrackerV2():AliTracker(){}
7f6ddf58 24 AliITStrackerV2(const AliITSgeom *geom,Int_t event=0) throw (const Char_t *);
006b5f7f 25 AliCluster *GetCluster(Int_t index) const;
26 Int_t Clusters2Tracks(const TFile *in, TFile *out);
14825d5a 27 Int_t PropagateBack(const TFile *in, TFile *out);
7f6ddf58 28 void SetupFirstPass(Int_t *flags, Double_t *cuts=0);
29 void SetupSecondPass(Int_t *flags, Double_t *cuts=0);
4ab260d6 30 Bool_t RefitAt(Double_t x, AliITStrackV2 *t, Int_t *index);
7f6ddf58 31
32 class AliITSdetector {
33 public:
34 AliITSdetector(){}
35 AliITSdetector(Double_t r,Double_t phi) {fR=r; fPhi=phi;}
36 void *operator new(size_t s,AliITSdetector *p) {return p;}
37 Double_t GetR() const {return fR;}
38 Double_t GetPhi() const {return fPhi;}
39 private:
40 Double_t fR; // polar coordinates
41 Double_t fPhi; // of this detector
42 };
43
44 class AliITSlayer {
45 public:
46 AliITSlayer();
47 AliITSlayer(Double_t r, Double_t p, Double_t z, Int_t nl, Int_t nd);
48 ~AliITSlayer();
49 Int_t InsertCluster(AliITSclusterV2 *c);
50 void SelectClusters(Double_t zmi,Double_t zma,Double_t ymi,Double_t yma);
51 const AliITSclusterV2 *GetNextCluster(Int_t &ci);
52 void *operator new(size_t s, AliITSlayer *p) {return p;}
53 Double_t GetR() const {return fR;}
54 AliITSclusterV2 *GetCluster(Int_t i) const {return fClusters[i];}
55 AliITSdetector &GetDetector(Int_t n) const { return fDetectors[n]; }
56 Int_t FindDetectorIndex(Double_t phi, Double_t z) const;
a9a2d814 57 Double_t GetThickness(Double_t y, Double_t z) const;
7f6ddf58 58 Int_t InRoad() const ;
59 Int_t GetNumberOfClusters() const {return fN;}
60 private:
61 Double_t fR; // mean radius of this layer
62 Double_t fPhiOffset; // offset of the first detector in Phi
63 Int_t fNladders; // number of ladders
64 Double_t fZOffset; // offset of the first detector in Z
65 Int_t fNdetectors; // detectors/ladder
66 AliITSdetector *fDetectors; // array of detectors
67 Int_t fN; // number of clusters
68 AliITSclusterV2 *fClusters[kMaxClusterPerLayer]; // pointers to clusters
69 Double_t fZmax; // edges
70 Double_t fYmin; // of the
71 Double_t fYmax; // "window"
72 Int_t fI; // index of the current cluster within the "window"
73 Int_t FindClusterIndex(Double_t z) const;
74 };
006b5f7f 75
76private:
7f6ddf58 77 void CookLabel(AliKalmanTrack *t,Float_t wrong) const;
a9a2d814 78 Double_t GetEffectiveThickness(Double_t y, Double_t z) const;
006b5f7f 79 void FollowProlongation();
80 Int_t TakeNextProlongation();
006b5f7f 81 void ResetBestTrack() {
82 fBestTrack.~AliITStrackV2();
83 new(&fBestTrack) AliITStrackV2(fTrackToFollow);
84 }
006b5f7f 85 void ResetTrackToFollow(const AliITStrackV2 &t) {
86 fTrackToFollow.~AliITStrackV2();
87 new(&fTrackToFollow) AliITStrackV2(t);
88 }
7f6ddf58 89 Int_t fEventN; //event number
90 Int_t fI; // index of the current layer
006b5f7f 91 static AliITSlayer fLayers[kMaxLayer]; // ITS layers
7f6ddf58 92 AliITStrackV2 fTracks[kMaxLayer]; // track estimations at the ITS layers
93 AliITStrackV2 fBestTrack; // "best" track
94 AliITStrackV2 fTrackToFollow; // followed track
95 Int_t fPass; // current pass through the data
96 Int_t fConstraint[2]; // constraint flags
006b5f7f 97};
98
99
7f6ddf58 100inline void AliITStrackerV2::SetupFirstPass(Int_t *flags, Double_t *cuts) {
101 // This function sets up flags and cuts for the first tracking pass
102 //
103 // flags[0] - vertex constaint flag
104 // negative means "skip the pass"
105 // 0 means "no constraint"
106 // positive means "normal constraint"
107
108 fConstraint[0]=flags[0];
109 if (cuts==0) return;
110}
111
112inline void AliITStrackerV2::SetupSecondPass(Int_t *flags, Double_t *cuts) {
113 // This function sets up flags and cuts for the second tracking pass
114 //
115 // flags[0] - vertex constaint flag
116 // negative means "skip the pass"
117 // 0 means "no constraint"
118 // positive means "normal constraint"
119
120 fConstraint[1]=flags[0];
121 if (cuts==0) return;
122}
123
124inline void AliITStrackerV2::CookLabel(AliKalmanTrack *t,Float_t wrong) const {
125 //--------------------------------------------------------------------
126 //This function "cooks" a track label. If label<0, this track is fake.
127 //--------------------------------------------------------------------
128 Int_t tpcLabel=t->GetLabel();
129 if (tpcLabel<0) return;
130 AliTracker::CookLabel(t,wrong);
131 if (tpcLabel != t->GetLabel()) t->SetLabel(-tpcLabel);
132}
006b5f7f 133
134#endif