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[u/mrichter/AliRoot.git] / ITS / AliITStrackerV2.h
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18856a77 1#ifndef ALIITSTRACKERV2_H
2#define ALIITSTRACKERV2_H
006b5f7f 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
00a7cc50 8// reads AliITSRecPoint clusters and creates AliITStrackV2 tracks
18856a77 9// Origin: Iouri Belikov, CERN, Jouri.Belikov@cern.ch
006b5f7f 10//-------------------------------------------------------------------------
11#include "AliTracker.h"
12#include "AliITSrecoV2.h"
13#include "AliITStrackV2.h"
14
00a7cc50 15class AliITSRecPoint;
c630aafd 16class AliESD;
c630aafd 17class TTree;
006b5f7f 18
19
20//-------------------------------------------------------------------------
21class AliITStrackerV2 : public AliTracker {
22public:
6c94f330 23 AliITStrackerV2();
1f3e997f 24 AliITStrackerV2(const Char_t *geom);
c219fd63 25 ~AliITStrackerV2(){}
006b5f7f 26 AliCluster *GetCluster(Int_t index) const;
00a7cc50 27 AliITSRecPoint *GetCluster(Int_t l, Int_t c) const {
c219fd63 28 return fgLayers[l].GetCluster(c);
29 }
30 Int_t GetNumberOfClustersLayer(Int_t n) const {
31 return fgLayers[n].GetNumberOfClusters();
32 }
c630aafd 33 Int_t LoadClusters(TTree *cf);
61ab8ea8 34 void UnloadClusters();
c630aafd 35 Int_t Clusters2Tracks(AliESD *event);
c630aafd 36 Int_t PropagateBack(AliESD *event);
c630aafd 37 Int_t RefitInward(AliESD *event);
ef7253ac 38 Bool_t RefitAt(Double_t x, AliITStrackV2 *seed,
39 const AliITStrackV2 *t, Bool_t extra=kFALSE);
7f6ddf58 40 void SetupFirstPass(Int_t *flags, Double_t *cuts=0);
41 void SetupSecondPass(Int_t *flags, Double_t *cuts=0);
42
c0dd5278 43 void SetLastLayerToTrackTo(Int_t l=0) {fLastLayerToTrackTo=l;}
44 void SetLayersNotToSkip(Int_t *l);
45
b87bd7cd 46 void UseClusters(const AliKalmanTrack *t, Int_t from=0) const;
47
15dd636f 48 class AliITSdetector {
7f6ddf58 49 public:
6c94f330 50 AliITSdetector():fR(0.),fPhi(0.){}
51 AliITSdetector(Double_t r,Double_t phi):fR(r),fPhi(phi){}
7f6ddf58 52 Double_t GetR() const {return fR;}
53 Double_t GetPhi() const {return fPhi;}
54 private:
55 Double_t fR; // polar coordinates
56 Double_t fPhi; // of this detector
57 };
58
59 class AliITSlayer {
60 public:
c219fd63 61 enum {kNsector=5, kMaxClusterPerSector=kMaxClusterPerLayer/kNsector};
7f6ddf58 62 AliITSlayer();
63 AliITSlayer(Double_t r, Double_t p, Double_t z, Int_t nl, Int_t nd);
64 ~AliITSlayer();
00a7cc50 65 Int_t InsertCluster(AliITSRecPoint *c);
61ab8ea8 66 void ResetClusters();
c219fd63 67 Int_t SelectClusters(Float_t zmi, Float_t zma, Float_t ymi, Float_t yma);
00a7cc50 68 const AliITSRecPoint *GetNextCluster(Int_t &ci);
b87bd7cd 69 void ResetRoad();
70 Double_t GetRoad() const {return fRoad;}
7f6ddf58 71 Double_t GetR() const {return fR;}
00a7cc50 72 AliITSRecPoint *GetCluster(Int_t i) const { return fClusters[i]; }
7f6ddf58 73 AliITSdetector &GetDetector(Int_t n) const { return fDetectors[n]; }
74 Int_t FindDetectorIndex(Double_t phi, Double_t z) const;
61ab8ea8 75 Double_t GetThickness(Double_t y, Double_t z, Double_t &x0) const;
61ab8ea8 76 Int_t GetNladders() const {return fNladders;}
77 Int_t GetNdetectors() const {return fNdetectors;}
c219fd63 78 Int_t GetNumberOfClusters() const;
235b705f 79 protected:
6c94f330 80 AliITSlayer(const AliITSlayer&);
81 AliITSlayer &operator=(const AliITSlayer &tr);
7f6ddf58 82 Double_t fR; // mean radius of this layer
83 Double_t fPhiOffset; // offset of the first detector in Phi
84 Int_t fNladders; // number of ladders
85 Double_t fZOffset; // offset of the first detector in Z
86 Int_t fNdetectors; // detectors/ladder
87 AliITSdetector *fDetectors; // array of detectors
c219fd63 88
00a7cc50 89 AliITSRecPoint *fClusters[kMaxClusterPerLayer]; // pointers to clusters
c219fd63 90 Int_t fN[kNsector]; // numbers of clusters sector by sector
91
92 Int_t fIndex[kMaxClusterPerLayer]; // indexes of selected clusters
93 Int_t fNsel; // number of selected clusters
94
95 Double_t fRoad; // road defined by the cluster density
96 Int_t FindClusterIndex(Float_t z, Int_t s) const;
7f6ddf58 97 };
15dd636f 98
235b705f 99protected:
6c94f330 100 AliITStrackerV2(const AliITStrackerV2&);
7f6ddf58 101 void CookLabel(AliKalmanTrack *t,Float_t wrong) const;
a9a2d814 102 Double_t GetEffectiveThickness(Double_t y, Double_t z) const;
006b5f7f 103 void FollowProlongation();
104 Int_t TakeNextProlongation();
006b5f7f 105 void ResetBestTrack() {
106 fBestTrack.~AliITStrackV2();
107 new(&fBestTrack) AliITStrackV2(fTrackToFollow);
108 }
006b5f7f 109 void ResetTrackToFollow(const AliITStrackV2 &t) {
110 fTrackToFollow.~AliITStrackV2();
111 new(&fTrackToFollow) AliITStrackV2(t);
112 }
7f6ddf58 113 Int_t fI; // index of the current layer
18856a77 114 static AliITSlayer fgLayers[kMaxLayer];// ITS layers
7f6ddf58 115 AliITStrackV2 fTracks[kMaxLayer]; // track estimations at the ITS layers
116 AliITStrackV2 fBestTrack; // "best" track
117 AliITStrackV2 fTrackToFollow; // followed track
118 Int_t fPass; // current pass through the data
119 Int_t fConstraint[2]; // constraint flags
8676d691 120
c0dd5278 121 Int_t fLayersNotToSkip[kMaxLayer]; // layer masks
122 Int_t fLastLayerToTrackTo; // the innermost layer to track to
15dd636f 123
6c94f330 124private:
125 AliITStrackerV2 &operator=(const AliITStrackerV2 &tr);
c630aafd 126 ClassDef(AliITStrackerV2,1) //ITS tracker V2
006b5f7f 127};
128
129
7f6ddf58 130inline void AliITStrackerV2::SetupFirstPass(Int_t *flags, Double_t *cuts) {
131 // This function sets up flags and cuts for the first tracking pass
132 //
133 // flags[0] - vertex constaint flag
134 // negative means "skip the pass"
135 // 0 means "no constraint"
136 // positive means "normal constraint"
137
138 fConstraint[0]=flags[0];
139 if (cuts==0) return;
140}
141
142inline void AliITStrackerV2::SetupSecondPass(Int_t *flags, Double_t *cuts) {
143 // This function sets up flags and cuts for the second tracking pass
144 //
145 // flags[0] - vertex constaint flag
146 // negative means "skip the pass"
147 // 0 means "no constraint"
148 // positive means "normal constraint"
149
150 fConstraint[1]=flags[0];
151 if (cuts==0) return;
152}
153
154inline void AliITStrackerV2::CookLabel(AliKalmanTrack *t,Float_t wrong) const {
155 //--------------------------------------------------------------------
156 //This function "cooks" a track label. If label<0, this track is fake.
157 //--------------------------------------------------------------------
158 Int_t tpcLabel=t->GetLabel();
159 if (tpcLabel<0) return;
160 AliTracker::CookLabel(t,wrong);
15dd636f 161 if (tpcLabel != t->GetLabel()) t->SetLabel(-tpcLabel);
7f6ddf58 162}
006b5f7f 163
164#endif