New calibration data: capacitances (Ivana,Laurent)
[u/mrichter/AliRoot.git] / STEER / AliTrackReference.cxx
CommitLineData
aab9c8d5 1/**************************************************************************
2 * Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. *
3 * *
4 * Author: The ALICE Off-line Project. *
5 * Contributors are mentioned in the code where appropriate. *
6 * *
7 * Permission to use, copy, modify and distribute this software and its *
8 * documentation strictly for non-commercial purposes is hereby granted *
9 * without fee, provided that the above copyright notice appears in all *
10 * copies and that both the copyright notice and this permission notice *
11 * appear in the supporting documentation. The authors make no claims *
12 * about the suitability of this software for any purpose. It is *
13 * provided "as is" without express or implied warranty. *
14 **************************************************************************/
15
0742d588 16/* $Id$ */
116cbefd 17
2cad796f 18#include "TVirtualMC.h"
0742d588 19
2d74ba4f 20#include "AliRun.h"
0742d588 21#include "AliTrackReference.h"
ac3eaff4 22#include "AliExternalTrackParam.h"
23#include "AliKalmanTrack.h"
2d74ba4f 24
25//
26// Track Reference object is created every time particle is
27// crossing detector bounds. The object is created by Step Manager
28//
29// The class stores the following informations:
30// track label,
31// track position: X,Y,X
32// track momentum px, py, pz
33// track length and time of fligth: both in cm
34// status bits from Monte Carlo
35//
36
aab9c8d5 37
38ClassImp(AliTrackReference)
39
e2afb3b6 40//_______________________________________________________________________
41 AliTrackReference::AliTrackReference():
448312df 42 TObject(),
e2afb3b6 43 fTrack(0),
44 fX(0),
45 fY(0),
46 fZ(0),
47 fPx(0),
48 fPy(0),
49 fPz(0),
448312df 50 fLength(0),
3142ebc3 51 fTime(0),
52 fUserId(0)
aab9c8d5 53{
54 //
55 // Default constructor
2d74ba4f 56 // Creates empty object
57
58 for(Int_t i=0; i<16; i++) ResetBit(BIT(i));
59}
60
61//_______________________________________________________________________
448312df 62AliTrackReference::AliTrackReference(Int_t label) :
90e48c0c 63 TObject(),
64 fTrack(label),
65 fX(0),
66 fY(0),
67 fZ(0),
68 fPx(0),
69 fPy(0),
70 fPz(0),
71 fLength(gMC->TrackLength()),
3142ebc3 72 fTime(gMC->TrackTime()),
73 fUserId(0)
448312df 74{
2d74ba4f 75 //
76 // Create Reference object out of label and
77 // data in TVirtualMC object
78 //
79 // Creates an object and fill all parameters
80 // from data in VirtualMC
aab9c8d5 81 //
2d74ba4f 82 // Sylwester Radomski, (S.Radomski@gsi.de)
83 // GSI, Jan 31, 2003
84 //
2cad796f 85
90e48c0c 86 Double_t vec[4];
2d74ba4f 87
90e48c0c 88 gMC->TrackPosition(vec[0],vec[1],vec[2]);
2d74ba4f 89
90 fX = vec[0];
91 fY = vec[1];
92 fZ = vec[2];
93
90e48c0c 94 gMC->TrackMomentum(vec[0],vec[1],vec[2],vec[3]);
2d74ba4f 95
96 fPx = vec[0];
97 fPy = vec[1];
b745fc4c 98 fPz = vec[2];
2d74ba4f 99
100 // Set Up status code
101 // Copy Bits from virtual MC
102
103 for(Int_t i=0; i<16; i++) ResetBit(BIT(i));
104
2cad796f 105 SetBit(BIT(0), gMC->IsNewTrack());
106 SetBit(BIT(1), gMC->IsTrackAlive());
107 SetBit(BIT(2), gMC->IsTrackDisappeared());
108 SetBit(BIT(3), gMC->IsTrackEntering());
109 SetBit(BIT(4), gMC->IsTrackExiting());
110 SetBit(BIT(5), gMC->IsTrackInside());
111 SetBit(BIT(6), gMC->IsTrackOut());
112 SetBit(BIT(7), gMC->IsTrackStop());
aab9c8d5 113}
2d74ba4f 114//_______________________________________________________________________
ac3eaff4 115AliExternalTrackParam * AliTrackReference::MakeTrack(const AliTrackReference *ref, Double_t mass)
116{
117 //
118 // Make dummy track from the track reference
119 // negative mass means opposite charge
120 //
121 Double_t xx[5];
122 Double_t cc[15];
123 for (Int_t i=0;i<15;i++) cc[i]=0;
124 Double_t x = ref->X(), y = ref->Y(), z = ref->Z();
125 Double_t alpha = TMath::ATan2(y,x);
126 Double_t xr = TMath::Sqrt(x*x+y*y);
b31d3cd8 127 xx[0] = ref->LocalY();
ac3eaff4 128 xx[1] = z;
129 xx[3] = ref->Pz()/ref->Pt();
c9ec41e8 130 xx[4] = 1./ref->Pt();
ac3eaff4 131 if (mass<0) xx[4]*=-1.; // negative mass - negative direction
132 Double_t alphap = TMath::ATan2(ref->Py(),ref->Px())-alpha;
133 if (alphap> TMath::Pi()) alphap-=TMath::Pi();
134 if (alphap<-TMath::Pi()) alphap+=TMath::Pi();
135 xx[2] = TMath::Sin(alphap);
c9ec41e8 136
ac3eaff4 137 AliExternalTrackParam * track = new AliExternalTrackParam(xr,alpha,xx,cc);
ac3eaff4 138 return track;
139}
140
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