Updated code for tracking V2 (from Y. Belikov)
[u/mrichter/AliRoot.git] / ITS / AliITStrackerV2.h
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006b5f7f 1#ifndef ALIITSTRACKER_H
2#define ALIITSTRACKER_H
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
8//
9// Origin: Iouri Belikov, CERN, Jouri.Belikov@cern.ch
10//-------------------------------------------------------------------------
11#include "AliTracker.h"
12#include "AliITSrecoV2.h"
13#include "AliITStrackV2.h"
14
15class AliITSclusterV2;
16class AliITSgeom;
17class TFile;
18
19
20//-------------------------------------------------------------------------
21class AliITStrackerV2 : public AliTracker {
22public:
23 AliITStrackerV2():AliTracker(){}
7f6ddf58 24 AliITStrackerV2(const AliITSgeom *geom,Int_t event=0) throw (const Char_t *);
006b5f7f 25 AliCluster *GetCluster(Int_t index) const;
26 Int_t Clusters2Tracks(const TFile *in, TFile *out);
14825d5a 27 Int_t PropagateBack(const TFile *in, TFile *out);
7f6ddf58 28 void SetupFirstPass(Int_t *flags, Double_t *cuts=0);
29 void SetupSecondPass(Int_t *flags, Double_t *cuts=0);
30
31 class AliITSdetector {
32 public:
33 AliITSdetector(){}
34 AliITSdetector(Double_t r,Double_t phi) {fR=r; fPhi=phi;}
35 void *operator new(size_t s,AliITSdetector *p) {return p;}
36 Double_t GetR() const {return fR;}
37 Double_t GetPhi() const {return fPhi;}
38 private:
39 Double_t fR; // polar coordinates
40 Double_t fPhi; // of this detector
41 };
42
43 class AliITSlayer {
44 public:
45 AliITSlayer();
46 AliITSlayer(Double_t r, Double_t p, Double_t z, Int_t nl, Int_t nd);
47 ~AliITSlayer();
48 Int_t InsertCluster(AliITSclusterV2 *c);
49 void SelectClusters(Double_t zmi,Double_t zma,Double_t ymi,Double_t yma);
50 const AliITSclusterV2 *GetNextCluster(Int_t &ci);
51 void *operator new(size_t s, AliITSlayer *p) {return p;}
52 Double_t GetR() const {return fR;}
53 AliITSclusterV2 *GetCluster(Int_t i) const {return fClusters[i];}
54 AliITSdetector &GetDetector(Int_t n) const { return fDetectors[n]; }
55 Int_t FindDetectorIndex(Double_t phi, Double_t z) const;
a9a2d814 56 Double_t GetThickness(Double_t y, Double_t z) const;
7f6ddf58 57 Int_t InRoad() const ;
58 Int_t GetNumberOfClusters() const {return fN;}
59 private:
60 Double_t fR; // mean radius of this layer
61 Double_t fPhiOffset; // offset of the first detector in Phi
62 Int_t fNladders; // number of ladders
63 Double_t fZOffset; // offset of the first detector in Z
64 Int_t fNdetectors; // detectors/ladder
65 AliITSdetector *fDetectors; // array of detectors
66 Int_t fN; // number of clusters
67 AliITSclusterV2 *fClusters[kMaxClusterPerLayer]; // pointers to clusters
68 Double_t fZmax; // edges
69 Double_t fYmin; // of the
70 Double_t fYmax; // "window"
71 Int_t fI; // index of the current cluster within the "window"
72 Int_t FindClusterIndex(Double_t z) const;
73 };
006b5f7f 74
75private:
7f6ddf58 76 void CookLabel(AliKalmanTrack *t,Float_t wrong) const;
a9a2d814 77 Double_t GetEffectiveThickness(Double_t y, Double_t z) const;
006b5f7f 78 void FollowProlongation();
79 Int_t TakeNextProlongation();
006b5f7f 80 void ResetBestTrack() {
81 fBestTrack.~AliITStrackV2();
82 new(&fBestTrack) AliITStrackV2(fTrackToFollow);
83 }
006b5f7f 84 void ResetTrackToFollow(const AliITStrackV2 &t) {
85 fTrackToFollow.~AliITStrackV2();
86 new(&fTrackToFollow) AliITStrackV2(t);
87 }
7f6ddf58 88 Int_t fEventN; //event number
89 Int_t fI; // index of the current layer
006b5f7f 90 static AliITSlayer fLayers[kMaxLayer]; // ITS layers
7f6ddf58 91 AliITStrackV2 fTracks[kMaxLayer]; // track estimations at the ITS layers
92 AliITStrackV2 fBestTrack; // "best" track
93 AliITStrackV2 fTrackToFollow; // followed track
94 Int_t fPass; // current pass through the data
95 Int_t fConstraint[2]; // constraint flags
006b5f7f 96};
97
98
7f6ddf58 99inline void AliITStrackerV2::SetupFirstPass(Int_t *flags, Double_t *cuts) {
100 // This function sets up flags and cuts for the first tracking pass
101 //
102 // flags[0] - vertex constaint flag
103 // negative means "skip the pass"
104 // 0 means "no constraint"
105 // positive means "normal constraint"
106
107 fConstraint[0]=flags[0];
108 if (cuts==0) return;
109}
110
111inline void AliITStrackerV2::SetupSecondPass(Int_t *flags, Double_t *cuts) {
112 // This function sets up flags and cuts for the second tracking pass
113 //
114 // flags[0] - vertex constaint flag
115 // negative means "skip the pass"
116 // 0 means "no constraint"
117 // positive means "normal constraint"
118
119 fConstraint[1]=flags[0];
120 if (cuts==0) return;
121}
122
123inline void AliITStrackerV2::CookLabel(AliKalmanTrack *t,Float_t wrong) const {
124 //--------------------------------------------------------------------
125 //This function "cooks" a track label. If label<0, this track is fake.
126 //--------------------------------------------------------------------
127 Int_t tpcLabel=t->GetLabel();
128 if (tpcLabel<0) return;
129 AliTracker::CookLabel(t,wrong);
130 if (tpcLabel != t->GetLabel()) t->SetLabel(-tpcLabel);
131}
006b5f7f 132
133#endif