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 AliITSclusterV2 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"
15 class AliITSclusterV2;
21 //-------------------------------------------------------------------------
22 class AliITStrackerV2 : public AliTracker {
24 AliITStrackerV2():AliTracker(){}
25 AliITStrackerV2(const AliITSgeom *geom);
26 AliCluster *GetCluster(Int_t index) const;
27 Int_t LoadClusters(TTree *cf);
28 void UnloadClusters();
29 Int_t Clusters2Tracks(TTree *in, TTree *out);
30 Int_t Clusters2Tracks(AliESD *event);
31 Int_t PropagateBack(AliESD *event);
32 Int_t RefitInward(AliESD *event);
33 Bool_t RefitAt(Double_t x, AliITStrackV2 *seed, const AliITStrackV2 *t);
34 void SetupFirstPass(Int_t *flags, Double_t *cuts=0);
35 void SetupSecondPass(Int_t *flags, Double_t *cuts=0);
37 void SetLastLayerToTrackTo(Int_t l=0) {fLastLayerToTrackTo=l;}
38 void SetLayersNotToSkip(Int_t *l);
40 void UseClusters(const AliKalmanTrack *t, Int_t from=0) const;
42 class AliITSdetector {
45 AliITSdetector(Double_t r,Double_t phi) {fR=r; fPhi=phi;}
46 void *operator new(size_t s,AliITSdetector *p) {return p;}
47 Double_t GetR() const {return fR;}
48 Double_t GetPhi() const {return fPhi;}
50 Double_t fR; // polar coordinates
51 Double_t fPhi; // of this detector
57 AliITSlayer(Double_t r, Double_t p, Double_t z, Int_t nl, Int_t nd);
59 Int_t InsertCluster(AliITSclusterV2 *c);
61 void SelectClusters(Double_t zmi,Double_t zma,Double_t ymi,Double_t yma);
62 const AliITSclusterV2 *GetNextCluster(Int_t &ci);
63 void *operator new(size_t s, AliITSlayer *p) {return p;}
65 Double_t GetRoad() const {return fRoad;}
66 Double_t GetR() const {return fR;}
67 AliITSclusterV2 *GetCluster(Int_t i) const {return fClusters[i];}
68 AliITSdetector &GetDetector(Int_t n) const { return fDetectors[n]; }
69 Int_t FindDetectorIndex(Double_t phi, Double_t z) const;
70 Double_t GetThickness(Double_t y, Double_t z, Double_t &x0) const;
71 Int_t InRoad() const ;
72 Int_t GetNumberOfClusters() const {return fN;}
73 Int_t GetNladders() const {return fNladders;}
74 Int_t GetNdetectors() const {return fNdetectors;}
76 Double_t fR; // mean radius of this layer
77 Double_t fPhiOffset; // offset of the first detector in Phi
78 Int_t fNladders; // number of ladders
79 Double_t fZOffset; // offset of the first detector in Z
80 Int_t fNdetectors; // detectors/ladder
81 AliITSdetector *fDetectors; // array of detectors
82 Int_t fN; // number of clusters
83 AliITSclusterV2 *fClusters[kMaxClusterPerLayer]; // pointers to clusters
84 Double_t fZmax; // edges
85 Double_t fYmin; // of the
86 Double_t fYmax; // "window"
87 Int_t fI; // index of the current cluster within the "window"
88 Double_t fRoad; // road defined by the cluster density
89 Int_t FindClusterIndex(Double_t z) const;
93 void CookLabel(AliKalmanTrack *t,Float_t wrong) const;
94 Double_t GetEffectiveThickness(Double_t y, Double_t z) const;
95 void FollowProlongation();
96 Int_t TakeNextProlongation();
97 void ResetBestTrack() {
98 fBestTrack.~AliITStrackV2();
99 new(&fBestTrack) AliITStrackV2(fTrackToFollow);
101 void ResetTrackToFollow(const AliITStrackV2 &t) {
102 fTrackToFollow.~AliITStrackV2();
103 new(&fTrackToFollow) AliITStrackV2(t);
105 Int_t fI; // index of the current layer
106 static AliITSlayer fgLayers[kMaxLayer];// ITS layers
107 AliITStrackV2 fTracks[kMaxLayer]; // track estimations at the ITS layers
108 AliITStrackV2 fBestTrack; // "best" track
109 AliITStrackV2 fTrackToFollow; // followed track
110 Int_t fPass; // current pass through the data
111 Int_t fConstraint[2]; // constraint flags
113 Int_t fLayersNotToSkip[kMaxLayer]; // layer masks
114 Int_t fLastLayerToTrackTo; // the innermost layer to track to
116 ClassDef(AliITStrackerV2,1) //ITS tracker V2
120 inline void AliITStrackerV2::SetupFirstPass(Int_t *flags, Double_t *cuts) {
121 // This function sets up flags and cuts for the first tracking pass
123 // flags[0] - vertex constaint flag
124 // negative means "skip the pass"
125 // 0 means "no constraint"
126 // positive means "normal constraint"
128 fConstraint[0]=flags[0];
132 inline void AliITStrackerV2::SetupSecondPass(Int_t *flags, Double_t *cuts) {
133 // This function sets up flags and cuts for the second tracking pass
135 // flags[0] - vertex constaint flag
136 // negative means "skip the pass"
137 // 0 means "no constraint"
138 // positive means "normal constraint"
140 fConstraint[1]=flags[0];
144 inline void AliITStrackerV2::CookLabel(AliKalmanTrack *t,Float_t wrong) const {
145 //--------------------------------------------------------------------
146 //This function "cooks" a track label. If label<0, this track is fake.
147 //--------------------------------------------------------------------
148 Int_t tpcLabel=t->GetLabel();
149 if (tpcLabel<0) return;
150 AliTracker::CookLabel(t,wrong);
151 if (tpcLabel != t->GetLabel()) t->SetLabel(-tpcLabel);