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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
18856a77 8// reads AliITSclusterV2 clusters and creates AliITStrackV2 tracks
9// Origin: Iouri Belikov, CERN, Jouri.Belikov@cern.ch
006b5f7f 10//-------------------------------------------------------------------------
11#include "AliTracker.h"
12#include "AliITSrecoV2.h"
13#include "AliITStrackV2.h"
14
15class AliITSclusterV2;
c630aafd 16class AliESD;
006b5f7f 17class AliITSgeom;
c630aafd 18class TTree;
006b5f7f 19
20
21//-------------------------------------------------------------------------
22class AliITStrackerV2 : public AliTracker {
23public:
24 AliITStrackerV2():AliTracker(){}
c630aafd 25 AliITStrackerV2(const AliITSgeom *geom);
006b5f7f 26 AliCluster *GetCluster(Int_t index) const;
235b705f 27 AliITSclusterV2 *GetClusterLayer(Int_t layn, Int_t ncl) const
28 {return fgLayers[layn].GetCluster(ncl);}
29 Int_t GetNumberOfClustersLayer(Int_t layn) const
30 {return fgLayers[layn].GetNumberOfClusters();}
c630aafd 31 Int_t LoadClusters(TTree *cf);
61ab8ea8 32 void UnloadClusters();
c630aafd 33 Int_t Clusters2Tracks(TTree *in, TTree *out);
34 Int_t Clusters2Tracks(AliESD *event);
c630aafd 35 Int_t PropagateBack(AliESD *event);
c630aafd 36 Int_t RefitInward(AliESD *event);
37 Bool_t RefitAt(Double_t x, AliITStrackV2 *seed, const AliITStrackV2 *t);
7f6ddf58 38 void SetupFirstPass(Int_t *flags, Double_t *cuts=0);
39 void SetupSecondPass(Int_t *flags, Double_t *cuts=0);
40
c0dd5278 41 void SetLastLayerToTrackTo(Int_t l=0) {fLastLayerToTrackTo=l;}
42 void SetLayersNotToSkip(Int_t *l);
43
b87bd7cd 44 void UseClusters(const AliKalmanTrack *t, Int_t from=0) const;
45
7f6ddf58 46 class AliITSdetector {
47 public:
48 AliITSdetector(){}
49 AliITSdetector(Double_t r,Double_t phi) {fR=r; fPhi=phi;}
2989818d 50 void *operator new(size_t /*s*/,AliITSdetector *p) {return p;}
7f6ddf58 51 Double_t GetR() const {return fR;}
52 Double_t GetPhi() const {return fPhi;}
53 private:
54 Double_t fR; // polar coordinates
55 Double_t fPhi; // of this detector
56 };
57
58 class AliITSlayer {
59 public:
60 AliITSlayer();
61 AliITSlayer(Double_t r, Double_t p, Double_t z, Int_t nl, Int_t nd);
62 ~AliITSlayer();
63 Int_t InsertCluster(AliITSclusterV2 *c);
61ab8ea8 64 void ResetClusters();
7f6ddf58 65 void SelectClusters(Double_t zmi,Double_t zma,Double_t ymi,Double_t yma);
66 const AliITSclusterV2 *GetNextCluster(Int_t &ci);
2989818d 67 void *operator new(size_t /*s*/, AliITSlayer *p) {return p;}
b87bd7cd 68 void ResetRoad();
69 Double_t GetRoad() const {return fRoad;}
7f6ddf58 70 Double_t GetR() const {return fR;}
71 AliITSclusterV2 *GetCluster(Int_t i) const {return fClusters[i];}
72 AliITSdetector &GetDetector(Int_t n) const { return fDetectors[n]; }
73 Int_t FindDetectorIndex(Double_t phi, Double_t z) const;
61ab8ea8 74 Double_t GetThickness(Double_t y, Double_t z, Double_t &x0) const;
7f6ddf58 75 Int_t InRoad() const ;
76 Int_t GetNumberOfClusters() const {return fN;}
61ab8ea8 77 Int_t GetNladders() const {return fNladders;}
78 Int_t GetNdetectors() const {return fNdetectors;}
235b705f 79 protected:
7f6ddf58 80 Double_t fR; // mean radius of this layer
81 Double_t fPhiOffset; // offset of the first detector in Phi
82 Int_t fNladders; // number of ladders
83 Double_t fZOffset; // offset of the first detector in Z
84 Int_t fNdetectors; // detectors/ladder
85 AliITSdetector *fDetectors; // array of detectors
86 Int_t fN; // number of clusters
87 AliITSclusterV2 *fClusters[kMaxClusterPerLayer]; // pointers to clusters
88 Double_t fZmax; // edges
89 Double_t fYmin; // of the
90 Double_t fYmax; // "window"
91 Int_t fI; // index of the current cluster within the "window"
b87bd7cd 92 Double_t fRoad; // road defined by the cluster density
7f6ddf58 93 Int_t FindClusterIndex(Double_t z) const;
94 };
006b5f7f 95
235b705f 96protected:
7f6ddf58 97 void CookLabel(AliKalmanTrack *t,Float_t wrong) const;
a9a2d814 98 Double_t GetEffectiveThickness(Double_t y, Double_t z) const;
006b5f7f 99 void FollowProlongation();
100 Int_t TakeNextProlongation();
006b5f7f 101 void ResetBestTrack() {
102 fBestTrack.~AliITStrackV2();
103 new(&fBestTrack) AliITStrackV2(fTrackToFollow);
104 }
006b5f7f 105 void ResetTrackToFollow(const AliITStrackV2 &t) {
106 fTrackToFollow.~AliITStrackV2();
107 new(&fTrackToFollow) AliITStrackV2(t);
108 }
7f6ddf58 109 Int_t fI; // index of the current layer
18856a77 110 static AliITSlayer fgLayers[kMaxLayer];// ITS layers
7f6ddf58 111 AliITStrackV2 fTracks[kMaxLayer]; // track estimations at the ITS layers
112 AliITStrackV2 fBestTrack; // "best" track
113 AliITStrackV2 fTrackToFollow; // followed track
114 Int_t fPass; // current pass through the data
115 Int_t fConstraint[2]; // constraint flags
8676d691 116
c0dd5278 117 Int_t fLayersNotToSkip[kMaxLayer]; // layer masks
118 Int_t fLastLayerToTrackTo; // the innermost layer to track to
119
c630aafd 120 ClassDef(AliITStrackerV2,1) //ITS tracker V2
006b5f7f 121};
122
123
7f6ddf58 124inline void AliITStrackerV2::SetupFirstPass(Int_t *flags, Double_t *cuts) {
125 // This function sets up flags and cuts for the first tracking pass
126 //
127 // flags[0] - vertex constaint flag
128 // negative means "skip the pass"
129 // 0 means "no constraint"
130 // positive means "normal constraint"
131
132 fConstraint[0]=flags[0];
133 if (cuts==0) return;
134}
135
136inline void AliITStrackerV2::SetupSecondPass(Int_t *flags, Double_t *cuts) {
137 // This function sets up flags and cuts for the second tracking pass
138 //
139 // flags[0] - vertex constaint flag
140 // negative means "skip the pass"
141 // 0 means "no constraint"
142 // positive means "normal constraint"
143
144 fConstraint[1]=flags[0];
145 if (cuts==0) return;
146}
147
148inline void AliITStrackerV2::CookLabel(AliKalmanTrack *t,Float_t wrong) const {
149 //--------------------------------------------------------------------
150 //This function "cooks" a track label. If label<0, this track is fake.
151 //--------------------------------------------------------------------
152 Int_t tpcLabel=t->GetLabel();
153 if (tpcLabel<0) return;
154 AliTracker::CookLabel(t,wrong);
155 if (tpcLabel != t->GetLabel()) t->SetLabel(-tpcLabel);
156}
006b5f7f 157
158#endif