1 #ifndef ALITRACKERBASE_H
2 #define ALITRACKERBASE_H
3 /* Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. *
4 * See cxx source for full Copyright notice */
6 /* $Id: AliTrackerBase.h 38069 2009-12-24 16:56:18Z belikov $ */
8 //-------------------------------------------------------------------------
9 // class AliTrackerBase
10 // This is the base tracker class, independent on STEER
11 // Origin: Marian.Ivanov@cern.ch
12 //-------------------------------------------------------------------------
15 #include <TGeoGlobalMagField.h>
19 class AliExternalTrackParam;
21 class AliTrackPointArray;
23 class AliTrackerBase : public TObject {
26 virtual ~AliTrackerBase(){}
28 void SetVertex(const Double_t *xyz, const Double_t *ers=0) {
29 fX=xyz[0]; fY=xyz[1]; fZ=xyz[2];
30 if (ers) { fSigmaX=ers[0]; fSigmaY=ers[1]; fSigmaZ=ers[2]; }
32 Double_t GetX() const {return fX;}
33 Double_t GetY() const {return fY;}
34 Double_t GetZ() const {return fZ;}
35 Double_t GetSigmaX() const {return fSigmaX;}
36 Double_t GetSigmaY() const {return fSigmaY;}
37 Double_t GetSigmaZ() const {return fSigmaZ;}
39 static Double_t GetTrackPredictedChi2(AliExternalTrackParam *track,
40 Double_t mass, Double_t step,
41 const AliExternalTrackParam *backup);
42 static void UpdateTrack(AliExternalTrackParam&,
43 const AliExternalTrackParam&);
45 Double_t MeanMaterialBudget(const Double_t *start, const Double_t *end,
48 Bool_t PropagateTrackTo(AliExternalTrackParam *track, Double_t x, Double_t m,
49 Double_t maxStep, Bool_t rotateTo=kTRUE, Double_t maxSnp=0.8, Double_t sign=1.);
50 static Bool_t PropagateTrackToBxByBz(AliExternalTrackParam *track, Double_t x,
52 Double_t maxStep, Bool_t rotateTo=kTRUE, Double_t maxSnp=0.8,Double_t sign=1.);
54 static Double_t GetBz(const Double_t *r);
55 static void GetBxByBz(const Double_t r[3], Double_t b[3]);
56 static Double_t GetBz();
57 static Bool_t UniformField();
60 static Double_t MakeC(Double_t x1,Double_t y1,
61 Double_t x2,Double_t y2,
62 Double_t x3,Double_t y3);
63 static Double_t MakeSnp(Double_t x1,Double_t y1,
64 Double_t x2,Double_t y2,
65 Double_t x3,Double_t y3);
66 static Double_t MakeTgl(Double_t x1,Double_t y1,
67 Double_t x2,Double_t y2,
68 Double_t z1,Double_t z2);
69 static Double_t MakeTgl(Double_t x1,Double_t y1,
70 Double_t x2,Double_t y2,
71 Double_t z1,Double_t z2,Double_t c);
72 static AliExternalTrackParam *MakeSeed(AliTrackPoint &point0,
73 AliTrackPoint &point1,
74 AliTrackPoint &point2);
75 static Double_t FitTrack(AliExternalTrackParam *trackParam,
76 AliTrackPointArray *pointArray,
77 Double_t mass, Double_t maxStep);
81 AliTrackerBase(const AliTrackerBase &atr);
83 AliTrackerBase & operator=(const AliTrackerBase & atr);
85 Double_t fX; //X-coordinate of the primary vertex
86 Double_t fY; //Y-coordinate of the primary vertex
87 Double_t fZ; //Z-coordinate of the primary vertex
89 Double_t fSigmaX; // error of the primary vertex position in X
90 Double_t fSigmaY; // error of the primary vertex position in Y
91 Double_t fSigmaZ; // error of the primary vertex position in Z
93 ClassDef(AliTrackerBase,1) //base tracker
96 //__________________________________________________________________________
97 inline Bool_t AliTrackerBase::UniformField()
99 AliMagF* fld = (AliMagF*)TGeoGlobalMagField::Instance()->GetField();
100 return fld ? fld->IsUniform():kTRUE;