Making online tracklets usable in offline reconstruction
[u/mrichter/AliRoot.git] / TRD / AliTRDtrackerV1.h
1 #ifndef ALITRDTRACKERV1_H
2 #define ALITRDTRACKERV1_H
3
4 /* Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. *
5 * See cxx source for full Copyright notice                               */ 
6 /* $Id$ */
7
8 ////////////////////////////////////////////////////////////////////////////
9 //                                                                        //
10 //  The TRD tracker                                                       //
11 //                                                                        //
12 //  Authors:                                                              //
13 //    Marian Ivanov <M.Ivanov@gsi.de>                                     //
14 //    Alex Bercuci <A.Bercuci@gsi.de>                                     //
15 //    Jouri Belikov <J.Belikov@cern.ch>                                   //
16 //    Markus Fasel <M.Fasel@gsi.de>                                       //
17 //                                                                        //
18 ////////////////////////////////////////////////////////////////////////////
19
20 #ifndef ALITRACKER_H
21 #include "AliTracker.h"
22 #endif
23
24 #ifndef ALITRDTRACKINGSECTOR_H
25 #include "AliTRDtrackingSector.h"
26 #endif
27
28 /**************************************************************************
29 * Class Status see source file                                           *
30 **************************************************************************/
31
32 class TFile;
33 class TTreeSRedirector;
34 class TClonesArray;
35 class TLinearFitter;
36
37 class AliRieman;
38 class AliESDEvent;
39 class AliCluster;
40 class AliTrackPoint;
41
42 class AliTRDcluster;
43 class AliTRDseedV1;
44 class AliTRDtrackingChamber;
45 class AliTRDchamberTimeBin;
46 class AliTRDtrackerFitter;
47 class AliTRDtrackV1;
48 class AliTRDReconstructor;
49 class AliTRDtrackerV1 : public AliTracker
50 {
51 public:
52   enum{
53     kOwner            = BIT(14) // owner of clusters
54    ,kRemoveContainers = BIT(15) // delete containers after usage
55   };
56   enum{
57     kMaxLayersPerSector   = 1000
58     , kMaxTimeBinIndex    = 216
59     , kTrackingSectors    = 18
60     , kNTimeBins          = 35
61     , kNPlanes            = 6
62     , kNSeedPlanes        = 4
63     , kMaxTracksStack     = 100
64     , kNConfigs           = 15
65   };
66   AliTRDtrackerV1(AliTRDReconstructor *rec = 0x0);
67   virtual ~AliTRDtrackerV1();
68   
69   //temporary
70   AliTRDtrackingSector* GetTrackingSector(Int_t sec) {return &fTrSec[sec];}
71   
72   Int_t           Clusters2Tracks(AliESDEvent *esd);
73   AliCluster*     GetCluster(Int_t index) const;
74   AliTRDseedV1*   GetTracklet(Int_t index) const;
75   AliKalmanTrack* GetTrack(Int_t index) const;
76   TClonesArray*   GetListOfClusters() const  { return fClusters;}
77   TClonesArray*   GetListOfTracklets() const { return fTracklets;}
78   TClonesArray*   GetListOfTracks() const    { return fTracks;}
79   static Int_t    GetNTimeBins()             { return fgNTimeBins;}
80   static void     GetExtrapolationConfig(Int_t iconfig, Int_t planes[2]);
81   static void     GetSeedingConfig(Int_t iconfig, Int_t planes[4]);
82   static TLinearFitter*  GetTiltedRiemanFitter();
83   static TLinearFitter*  GetTiltedRiemanFitterConstraint();
84   static AliRieman*      GetRiemanFitter();
85   static void     FitRieman(AliTRDcluster **clusters, Double_t chi2[2]);
86   static Float_t  FitRieman(AliTRDseedV1 *tracklets, Double_t *chi2, Int_t *planes = 0x0);
87   static Float_t  FitTiltedRiemanConstraint(AliTRDseedV1 *tracklets, Double_t zVertex);
88   static Float_t  FitTiltedRieman(AliTRDseedV1 *tracklets, Bool_t sigError);
89   
90   static Double_t FitRiemanTilt(const AliTRDtrackV1 *trk, AliTRDseedV1 *tracklets = 0x0, Bool_t err=0, Int_t np = 0, AliTrackPoint *points = 0x0);
91   static Double_t FitLine(const AliTRDtrackV1 *trk, AliTRDseedV1 *tracklets = 0x0, Bool_t err=0, Int_t np = 0, AliTrackPoint *points = 0x0);
92   static Double_t FitKalman(AliTRDtrackV1 *trk, AliTRDseedV1 *tracklets = 0x0, Bool_t up=0, Int_t np = 0, AliTrackPoint *points = 0x0);
93
94   Bool_t          IsClustersOwner() const    { return TestBit(kOwner);}
95   Bool_t          HasRemoveContainers() const    { return TestBit(kRemoveContainers);}
96   void            SetClustersOwner(Bool_t own=kTRUE) {SetBit(kOwner, own); if(!own) fClusters = 0x0;}
97   void            SetRemoveContainers(Bool_t rm=kTRUE) {SetBit(kRemoveContainers, rm);}
98
99   Int_t           FollowBackProlongation(AliTRDtrackV1 &t);
100   Int_t           FollowProlongation(AliTRDtrackV1 &t);
101   Int_t           LoadClusters(TTree *cTree);
102   Int_t           LoadClusters(TClonesArray *clusters);
103   Int_t           PropagateBack(AliESDEvent *event);
104   static Int_t    PropagateToX(AliTRDtrackV1 &t, Double_t xToGo, Double_t maxStep);
105   Int_t           ReadClusters(TClonesArray* &array, TTree *in) const;
106   Int_t           RefitInward(AliESDEvent *event);
107   static void     SetNTimeBins(Int_t nTimeBins){fgNTimeBins = nTimeBins; }
108   void            SetReconstructor(const AliTRDReconstructor *rec){ fReconstructor = rec; }
109   void            UnloadClusters();
110
111   class AliTRDLeastSquare{
112   public:
113     AliTRDLeastSquare();
114     ~AliTRDLeastSquare(){};
115     
116     void                AddPoint(Double_t *x, Double_t y, Double_t sigmaY);
117     void                RemovePoint(Double_t *x, Double_t y, Double_t sigmaY);
118     void                Eval();
119     
120     Double_t    GetFunctionParameter(Int_t ParNumber) const {return fParams[ParNumber];}
121     Double_t    GetFunctionValue(Double_t *xpos) const;
122     void                GetCovarianceMatrix(Double_t *storage) const;
123   private:
124           AliTRDLeastSquare(const AliTRDLeastSquare &);
125     AliTRDLeastSquare& operator=(const AliTRDLeastSquare &);
126     Double_t    fParams[2];                                             // Fitparameter 
127     Double_t    fCovarianceMatrix[3];                   // Covariance Matrix
128     Double_t    fSums[6];                                               // Sums
129   };
130
131 protected:
132   static Bool_t  AdjustSector(AliTRDtrackV1 *track); 
133   Double_t       BuildSeedingConfigs(AliTRDtrackingChamber **stack, Int_t *configs);
134   Int_t          BuildTrackingContainers();
135   static Float_t CalculateChi2Z(AliTRDseedV1 *tracklets, Double_t offset, Double_t slope, Double_t xref);
136   Int_t          Clusters2TracksSM(Int_t sector, AliESDEvent *esd);
137   Int_t          Clusters2TracksStack(AliTRDtrackingChamber **stack, TClonesArray *esdTrackList);
138   AliTRDseedV1*  GetTracklet(AliTRDtrackV1 *trk, Int_t plane, Int_t &idx);
139   Bool_t         GetTrackPoint(Int_t index, AliTrackPoint &p) const;    
140   Float_t        GetR4Layer(Int_t ly) const { return fR[ly];}
141   Int_t          MakeSeeds(AliTRDtrackingChamber **stack, AliTRDseedV1 *sseed, Int_t *ipar);
142   AliTRDtrackV1* MakeTrack(AliTRDseedV1 *seeds, Double_t *params);
143   AliTRDtrackV1* SetTrack(AliTRDtrackV1 *track);
144   AliTRDseedV1*  SetTracklet(AliTRDseedV1 *tracklet);
145
146 private:
147   AliTRDtrackerV1(const AliTRDtrackerV1 &tracker);
148   AliTRDtrackerV1 &operator=(const AliTRDtrackerV1 &tracker);
149   Double_t              CookLikelihood(AliTRDseedV1 *cseed, Int_t planes[4]);
150   Double_t              CalculateTrackLikelihood(AliTRDseedV1 *tracklets, Double_t *chi2);
151   Int_t                 ImproveSeedQuality(AliTRDtrackingChamber **stack, AliTRDseedV1 *tracklet);
152   static Float_t        CalculateReferenceX(AliTRDseedV1 *tracklets);
153   void        ResetSeedTB();
154   Float_t     GetChi2Y(AliTRDseedV1 *tracklets) const;
155   Float_t     GetChi2Z(AliTRDseedV1 *tracklets) const;
156
157 private:
158   const AliTRDReconstructor *fReconstructor;            // reconstructor manager
159   AliTRDgeometry      *fGeom;                           // Pointer to TRD geometry
160   AliTRDtrackingSector fTrSec[kTrackingSectors];        // Array of tracking sectors;    
161   TClonesArray        *fClusters;                       // List of clusters
162   TClonesArray        *fTracklets;                      // List of tracklets
163   TClonesArray        *fTracks;                         // List of tracks
164   Float_t              fR[kNPlanes];                    //! rough radial position of each TRD layer
165
166   // should go to the recoParam
167   static const Double_t    fgkMaxChi2;                  // Max increment in track chi2 
168   static const Float_t     fgkMinClustersInTrack;       // Min number of clusters in track
169   static const Float_t     fgkLabelFraction;            // Min fraction of same label
170   static const Double_t    fgkMaxSnp;                   // Maximal snp for tracking
171   static const Double_t    fgkMaxStep;                  // Maximal step for tracking  
172   
173   // stand alone tracking
174   static Double_t      fgTopologicQA[kNConfigs];        //  Topologic quality
175   Double_t             fTrackQuality[kMaxTracksStack];  //  Track quality 
176   Int_t                fSeedLayer[kMaxTracksStack];     //  Seed layer
177   AliTRDchamberTimeBin *fSeedTB[kNSeedPlanes]; // seeding time bin planes
178   Int_t                fSieveSeeding;                   //! Seeding iterator
179   
180   static const Double_t fgkX0[kNPlanes];                // default values for the position of anode wire
181   static Int_t         fgNTimeBins;                     // Timebins per plane in track prolongation 
182   static TLinearFitter *fgTiltedRieman;                 //  Fitter for the tilted Rieman fit without vertex constriant
183   static TLinearFitter *fgTiltedRiemanConstrained;      //  Fitter for the tilted Rieman fit with vertex constraint     
184   static AliRieman     *fgRieman;                       //  Fitter for the untilted Rieman fit
185   
186   ClassDef(AliTRDtrackerV1, 3)                          //  TRD tracker - tracklet based tracking
187
188 };
189 #endif