1 #ifndef ALIITSTRACKERV2_H
2 #define ALIITSTRACKERV2_H
3 /* Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. *
4 * See cxx source for full Copyright notice */
6 //-------------------------------------------------------------------------
8 // reads AliITSRecPoint clusters and creates AliITStrackV2 tracks
9 // Origin: Iouri Belikov, CERN, Jouri.Belikov@cern.ch
10 //-------------------------------------------------------------------------
11 #include "AliTracker.h"
12 #include "AliITSrecoV2.h"
13 #include "AliITStrackV2.h"
21 //-------------------------------------------------------------------------
22 class AliITStrackerV2 : public AliTracker {
25 AliITStrackerV2(const AliITSgeom *geom);
27 AliCluster *GetCluster(Int_t index) const;
28 AliITSRecPoint *GetCluster(Int_t l, Int_t c) const {
29 return fgLayers[l].GetCluster(c);
31 Int_t GetNumberOfClustersLayer(Int_t n) const {
32 return fgLayers[n].GetNumberOfClusters();
34 Int_t LoadClusters(TTree *cf);
35 void UnloadClusters();
36 Int_t Clusters2Tracks(AliESD *event);
37 Int_t PropagateBack(AliESD *event);
38 Int_t RefitInward(AliESD *event);
39 Bool_t RefitAt(Double_t x, AliITStrackV2 *seed,
40 const AliITStrackV2 *t, Bool_t extra=kFALSE);
41 void SetupFirstPass(Int_t *flags, Double_t *cuts=0);
42 void SetupSecondPass(Int_t *flags, Double_t *cuts=0);
44 void SetLastLayerToTrackTo(Int_t l=0) {fLastLayerToTrackTo=l;}
45 void SetLayersNotToSkip(Int_t *l);
47 void UseClusters(const AliKalmanTrack *t, Int_t from=0) const;
49 class AliITSdetector {
51 AliITSdetector():fR(0.),fPhi(0.){}
52 AliITSdetector(Double_t r,Double_t phi):fR(r),fPhi(phi){}
53 Double_t GetR() const {return fR;}
54 Double_t GetPhi() const {return fPhi;}
56 Double_t fR; // polar coordinates
57 Double_t fPhi; // of this detector
62 enum {kNsector=5, kMaxClusterPerSector=kMaxClusterPerLayer/kNsector};
64 AliITSlayer(Double_t r, Double_t p, Double_t z, Int_t nl, Int_t nd);
66 Int_t InsertCluster(AliITSRecPoint *c);
68 Int_t SelectClusters(Float_t zmi, Float_t zma, Float_t ymi, Float_t yma);
69 const AliITSRecPoint *GetNextCluster(Int_t &ci);
71 Double_t GetRoad() const {return fRoad;}
72 Double_t GetR() const {return fR;}
73 AliITSRecPoint *GetCluster(Int_t i) const { return fClusters[i]; }
74 AliITSdetector &GetDetector(Int_t n) const { return fDetectors[n]; }
75 Int_t FindDetectorIndex(Double_t phi, Double_t z) const;
76 Double_t GetThickness(Double_t y, Double_t z, Double_t &x0) const;
77 Int_t GetNladders() const {return fNladders;}
78 Int_t GetNdetectors() const {return fNdetectors;}
79 Int_t GetNumberOfClusters() const;
81 AliITSlayer(const AliITSlayer&);
82 AliITSlayer &operator=(const AliITSlayer &tr);
83 Double_t fR; // mean radius of this layer
84 Double_t fPhiOffset; // offset of the first detector in Phi
85 Int_t fNladders; // number of ladders
86 Double_t fZOffset; // offset of the first detector in Z
87 Int_t fNdetectors; // detectors/ladder
88 AliITSdetector *fDetectors; // array of detectors
90 AliITSRecPoint *fClusters[kMaxClusterPerLayer]; // pointers to clusters
91 Int_t fN[kNsector]; // numbers of clusters sector by sector
93 Int_t fIndex[kMaxClusterPerLayer]; // indexes of selected clusters
94 Int_t fNsel; // number of selected clusters
96 Double_t fRoad; // road defined by the cluster density
97 Int_t FindClusterIndex(Float_t z, Int_t s) const;
101 AliITStrackerV2(const AliITStrackerV2&);
102 void CookLabel(AliKalmanTrack *t,Float_t wrong) const;
103 Double_t GetEffectiveThickness(Double_t y, Double_t z) const;
104 void FollowProlongation();
105 Int_t TakeNextProlongation();
106 void ResetBestTrack() {
107 fBestTrack.~AliITStrackV2();
108 new(&fBestTrack) AliITStrackV2(fTrackToFollow);
110 void ResetTrackToFollow(const AliITStrackV2 &t) {
111 fTrackToFollow.~AliITStrackV2();
112 new(&fTrackToFollow) AliITStrackV2(t);
114 Int_t fI; // index of the current layer
115 static AliITSlayer fgLayers[kMaxLayer];// ITS layers
116 AliITStrackV2 fTracks[kMaxLayer]; // track estimations at the ITS layers
117 AliITStrackV2 fBestTrack; // "best" track
118 AliITStrackV2 fTrackToFollow; // followed track
119 Int_t fPass; // current pass through the data
120 Int_t fConstraint[2]; // constraint flags
122 Int_t fLayersNotToSkip[kMaxLayer]; // layer masks
123 Int_t fLastLayerToTrackTo; // the innermost layer to track to
126 AliITStrackerV2 &operator=(const AliITStrackerV2 &tr);
127 ClassDef(AliITStrackerV2,1) //ITS tracker V2
131 inline void AliITStrackerV2::SetupFirstPass(Int_t *flags, Double_t *cuts) {
132 // This function sets up flags and cuts for the first tracking pass
134 // flags[0] - vertex constaint flag
135 // negative means "skip the pass"
136 // 0 means "no constraint"
137 // positive means "normal constraint"
139 fConstraint[0]=flags[0];
143 inline void AliITStrackerV2::SetupSecondPass(Int_t *flags, Double_t *cuts) {
144 // This function sets up flags and cuts for the second tracking pass
146 // flags[0] - vertex constaint flag
147 // negative means "skip the pass"
148 // 0 means "no constraint"
149 // positive means "normal constraint"
151 fConstraint[1]=flags[0];
155 inline void AliITStrackerV2::CookLabel(AliKalmanTrack *t,Float_t wrong) const {
156 //--------------------------------------------------------------------
157 //This function "cooks" a track label. If label<0, this track is fake.
158 //--------------------------------------------------------------------
159 Int_t tpcLabel=t->GetLabel();
160 if (tpcLabel<0) return;
161 AliTracker::CookLabel(t,wrong);
162 if (tpcLabel != t->GetLabel()) t->SetLabel(-tpcLabel);