1 #ifndef ALITRACKREFERENCE_H
2 #define ALITRACKREFERENCE_H
3 /* Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. *
4 * See cxx source for full Copyright notice */
9 // Track Reference object is created every time particle is
10 // crossing detector bounds.
11 // The object is created by Step Manager
17 class AliTrackReference : public TObject {
20 enum constants {kDisappeared = -1,
29 AliTrackReference(Int_t label, Int_t id = -999);
30 AliTrackReference(const AliTrackReference &tr);
31 virtual ~AliTrackReference() {}
33 // static AliExternalTrackParam * MakeTrack(const AliTrackReference *ref, Double_t mass);
34 virtual Int_t GetTrack() const {return fTrack;}
35 virtual void SetTrack(Int_t track) {fTrack=track;}
36 virtual void SetLength(Float_t length){fLength=length;}
37 virtual void SetTime(Float_t time) {fTime = time;}
38 virtual Float_t GetLength() const {return fLength;}
39 virtual Float_t GetTime() const {return fTime;}
40 virtual Int_t Label() const {return fTrack;}
41 virtual void SetLabel(Int_t track) {fTrack=track;}
42 virtual Float_t R() const {return TMath::Sqrt(fX*fX+fY*fY);}
43 virtual Float_t Pt() const {return TMath::Sqrt(fPx*fPx+fPy*fPy);}
44 virtual Float_t Phi() const {return TMath::Pi()+TMath::ATan2(-fPy,-fPx);}
45 virtual Float_t Theta() const {return (fPz==0)?TMath::Pi()/2:TMath::ACos(fPz/P());}
46 virtual Float_t X() const {return fX;}
47 virtual Float_t Y() const {return fY;}
48 virtual Float_t Z() const {return fZ;}
49 virtual Float_t Px() const {return fPx;}
50 virtual Float_t Py() const {return fPy;}
51 virtual Float_t Pz() const {return fPz;}
52 virtual Float_t P() const {return TMath::Sqrt(fPx*fPx+fPy*fPy+fPz*fPz);}
53 virtual Int_t UserId() const {return fUserId;}
54 virtual Int_t DetectorId() const {return fDetectorId;}
55 virtual void SetDetectorId(Int_t id){fDetectorId = id;}
56 virtual void SetPosition(Float_t x, Float_t y, Float_t z){fX=x; fY=y; fZ=z;}
57 virtual void SetMomentum(Float_t px, Float_t py, Float_t pz){fPx=px; fPy=py; fPz=pz;}
58 virtual void SetUserId(Int_t userId){fUserId=userId;}
60 // Methods to get position of the track reference in
61 // in the TPC/TRD/TOF Tracking coordinate system
63 virtual Float_t PhiPos() const {return TMath::Pi()+TMath::ATan2(-fY, -fX);}
64 virtual Float_t Alpha() const
65 {return TMath::Pi()*(20*((((Int_t)(PhiPos()*180/TMath::Pi()))/20))+10)/180.;}
66 virtual Float_t LocalX() const {return fX*TMath::Cos(-Alpha()) - fY*TMath::Sin(-Alpha());}
67 virtual Float_t LocalY() const {return fX*TMath::Sin(-Alpha()) + fY*TMath::Cos(-Alpha());}
69 Bool_t IsSortable() const {return kTRUE;}
70 Int_t Compare(const TObject *obj) const {
71 Int_t ll = ((AliTrackReference*)obj)->GetTrack();
72 if (ll < fTrack) return 1;
73 if (ll > fTrack) return -1;
77 virtual void Print(Option_t* opt="") const;
80 Int_t fTrack; // Track number
81 Float_t fX; // X reference position of the track
82 Float_t fY; // Y reference position of the track
83 Float_t fZ; // Z reference position of the track
84 Float_t fPx; // momentum
85 Float_t fPy; // momentum
86 Float_t fPz; // momentum
87 Float_t fLength; // track lenght from its origin in cm
88 Float_t fTime; // time of flight in cm
89 Int_t fUserId; // optional Id defined by user
90 Int_t fDetectorId; // Detector Id
91 ClassDef(AliTrackReference,6) //Base class for all Alice track references