1 #ifndef ALIFLATEXTERNALTRACKPARAM_H
2 #define ALIFLATEXTERNALTRACKPARAM_H
4 /* Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. *
5 * See cxx source for full Copyright notice *
6 * Primary Authors : Sergey Gorbunov, Jochen Thaeder, Chiara Zampolli */
9 * >> Flat structure representing parameters of an external track <<
13 #include "AliExternalTrackParam.h"
15 class AliFlatExternalTrackParam
19 AliFlatExternalTrackParam();
20 ~AliFlatExternalTrackParam() {}
22 // constructor and method for reinitialisation of virtual table
23 AliFlatExternalTrackParam( AliVConstructorReinitialisationFlag );
24 void Reinitialize() { new (this) AliFlatExternalTrackParam( AliVReinitialize ); }
26 void SetAlpha(Float_t alpha) {fAlpha = alpha;}
27 void SetX(Float_t x) {fX = x;}
28 void SetY(Float_t y) {fY = y;}
29 void SetZ(Float_t z) {fZ = z;}
30 void SetSnp(Float_t snp) {fSnp = snp;}
31 void SetTgl(Float_t tgl) {fTgl = tgl;}
32 void SetSigned1Pt(Float_t signed1Pt) {fSigned1Pt = signed1Pt;}
33 void SetCovEntry(Int_t idx, Float_t cov) {(idx >= 0 && idx < 15) ? fC[idx] = cov : 0.;}
35 Float_t GetAlpha() const {return fAlpha;}
36 Float_t GetX() const {return fX;}
37 Float_t GetY() const {return fY;}
38 Float_t GetZ() const {return fZ;}
39 Float_t GetSnp() const {return fSnp;}
40 Float_t GetTgl() const {return fTgl;}
41 Float_t GetSigned1Pt() const {return fSigned1Pt;}
42 Float_t* GetCov() const {return const_cast<Float_t*>(fC);}
43 Float_t GetCovEntry(Int_t idx) const {return (idx >= 0 && idx < 15) ? fC[idx] : 0.;}
44 Float_t GetPt() const {
45 Double_t pt1 = fabs( fSigned1Pt );
46 return (pt1>kAlmost0) ? 1./pt1 : kVeryBig;
48 void GetExternalTrackParam( AliExternalTrackParam &p ) const;
49 void SetExternalTrackParam( const AliExternalTrackParam *p );
53 Float_t fAlpha; // azimuthal angle of reference frame
54 Float_t fX; // x: radial distance
55 Float_t fY; // local Y-coordinate of a track (cm)
56 Float_t fZ; // local Z-coordinate of a track (cm)
57 Float_t fSnp; // local sine of the track momentum azimuthal angle
58 Float_t fTgl; // tangent of the track momentum dip angle
59 Float_t fSigned1Pt; // 1/pt (1/(GeV/c))
60 Float_t fC[15]; // covariance matrix
63 inline AliFlatExternalTrackParam::AliFlatExternalTrackParam()
73 for( int i=0; i<15; i++ ) fC[i]=0;
76 #pragma GCC diagnostic ignored "-Weffc++"
77 inline AliFlatExternalTrackParam::AliFlatExternalTrackParam( AliVConstructorReinitialisationFlag ){}
78 #pragma GCC diagnostic warning "-Weffc++"
80 inline void AliFlatExternalTrackParam::GetExternalTrackParam( AliExternalTrackParam &p ) const
82 // Get external track parameters
83 Float_t par[5] = { fY, fZ, fSnp, fTgl, fSigned1Pt };
84 p.Set( fX, fAlpha, par, fC );
87 inline void AliFlatExternalTrackParam::SetExternalTrackParam( const AliExternalTrackParam *p )
89 // Set external track parameters
91 fAlpha = p->GetAlpha();
97 fSigned1Pt = p->GetSigned1Pt();
98 for (Int_t idx = 0; idx <15; ++idx) fC[idx] = p->GetCovariance()[idx];