feature fixed (Christian)
[u/mrichter/AliRoot.git] / ITS / AliITStrackerV2.h
CommitLineData
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);
c219fd63 26 ~AliITStrackerV2(){}
006b5f7f 27 AliCluster *GetCluster(Int_t index) const;
c219fd63 28 AliITSclusterV2 *GetCluster(Int_t l, Int_t c) const {
29 return fgLayers[l].GetCluster(c);
30 }
31 Int_t GetNumberOfClustersLayer(Int_t n) const {
32 return fgLayers[n].GetNumberOfClusters();
33 }
c630aafd 34 Int_t LoadClusters(TTree *cf);
61ab8ea8 35 void UnloadClusters();
c630aafd 36 Int_t Clusters2Tracks(AliESD *event);
c630aafd 37 Int_t PropagateBack(AliESD *event);
c630aafd 38 Int_t RefitInward(AliESD *event);
39 Bool_t RefitAt(Double_t x, AliITStrackV2 *seed, const AliITStrackV2 *t);
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:
50 AliITSdetector(){}
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();
65 Int_t InsertCluster(AliITSclusterV2 *c);
61ab8ea8 66 void ResetClusters();
c219fd63 67 Int_t SelectClusters(Float_t zmi, Float_t zma, Float_t ymi, Float_t yma);
7f6ddf58 68 const AliITSclusterV2 *GetNextCluster(Int_t &ci);
b87bd7cd 69 void ResetRoad();
70 Double_t GetRoad() const {return fRoad;}
7f6ddf58 71 Double_t GetR() const {return fR;}
c219fd63 72 AliITSclusterV2 *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:
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
c219fd63 86
7f6ddf58 87 AliITSclusterV2 *fClusters[kMaxClusterPerLayer]; // pointers to clusters
c219fd63 88 Int_t fN[kNsector]; // numbers of clusters sector by sector
89
90 Int_t fIndex[kMaxClusterPerLayer]; // indexes of selected clusters
91 Int_t fNsel; // number of selected clusters
92
93 Double_t fRoad; // road defined by the cluster density
94 Int_t FindClusterIndex(Float_t z, Int_t s) const;
7f6ddf58 95 };
15dd636f 96
235b705f 97protected:
7f6ddf58 98 void CookLabel(AliKalmanTrack *t,Float_t wrong) const;
a9a2d814 99 Double_t GetEffectiveThickness(Double_t y, Double_t z) const;
006b5f7f 100 void FollowProlongation();
101 Int_t TakeNextProlongation();
006b5f7f 102 void ResetBestTrack() {
103 fBestTrack.~AliITStrackV2();
104 new(&fBestTrack) AliITStrackV2(fTrackToFollow);
105 }
006b5f7f 106 void ResetTrackToFollow(const AliITStrackV2 &t) {
107 fTrackToFollow.~AliITStrackV2();
108 new(&fTrackToFollow) AliITStrackV2(t);
109 }
7f6ddf58 110 Int_t fI; // index of the current layer
18856a77 111 static AliITSlayer fgLayers[kMaxLayer];// ITS layers
7f6ddf58 112 AliITStrackV2 fTracks[kMaxLayer]; // track estimations at the ITS layers
113 AliITStrackV2 fBestTrack; // "best" track
114 AliITStrackV2 fTrackToFollow; // followed track
115 Int_t fPass; // current pass through the data
116 Int_t fConstraint[2]; // constraint flags
8676d691 117
c0dd5278 118 Int_t fLayersNotToSkip[kMaxLayer]; // layer masks
119 Int_t fLastLayerToTrackTo; // the innermost layer to track to
15dd636f 120
c630aafd 121 ClassDef(AliITStrackerV2,1) //ITS tracker V2
006b5f7f 122};
123
124
7f6ddf58 125inline void AliITStrackerV2::SetupFirstPass(Int_t *flags, Double_t *cuts) {
126 // This function sets up flags and cuts for the first tracking pass
127 //
128 // flags[0] - vertex constaint flag
129 // negative means "skip the pass"
130 // 0 means "no constraint"
131 // positive means "normal constraint"
132
133 fConstraint[0]=flags[0];
134 if (cuts==0) return;
135}
136
137inline void AliITStrackerV2::SetupSecondPass(Int_t *flags, Double_t *cuts) {
138 // This function sets up flags and cuts for the second tracking pass
139 //
140 // flags[0] - vertex constaint flag
141 // negative means "skip the pass"
142 // 0 means "no constraint"
143 // positive means "normal constraint"
144
145 fConstraint[1]=flags[0];
146 if (cuts==0) return;
147}
148
149inline void AliITStrackerV2::CookLabel(AliKalmanTrack *t,Float_t wrong) const {
150 //--------------------------------------------------------------------
151 //This function "cooks" a track label. If label<0, this track is fake.
152 //--------------------------------------------------------------------
153 Int_t tpcLabel=t->GetLabel();
154 if (tpcLabel<0) return;
155 AliTracker::CookLabel(t,wrong);
15dd636f 156 if (tpcLabel != t->GetLabel()) t->SetLabel(-tpcLabel);
7f6ddf58 157}
006b5f7f 158
159#endif