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4bda3bc1 | 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 | ||
16 | /* | |
17 | $Log$ | |
18 | */ | |
19 | ||
20 | ||
21 | // Event generator that using an instance of type AliGenReader | |
22 | // reads particles from a file and applies cuts. | |
23 | ||
24 | ||
25 | #include "AliGenBeamGas.h" | |
26 | #include "AliRun.h" | |
27 | ||
28 | #include <TParticle.h> | |
29 | #include <TFile.h> | |
30 | #include <TTree.h> | |
31 | ||
32 | ||
33 | ClassImp(AliGenBeamGas) | |
34 | ||
35 | AliGenBeamGas::AliGenBeamGas() | |
36 | :AliGenExtFile() | |
37 | { | |
38 | // Constructor | |
39 | // | |
40 | fInteractions = 1; | |
41 | } | |
42 | ||
43 | AliGenBeamGas::AliGenBeamGas(const AliGenBeamGas & ExtFile) | |
44 | { | |
45 | // copy constructor | |
46 | } | |
47 | //____________________________________________________________ | |
48 | ||
49 | AliGenBeamGas::~AliGenBeamGas() | |
50 | { | |
51 | // Destructor | |
52 | delete fReader; | |
53 | } | |
54 | ||
55 | //___________________________________________________________ | |
56 | void AliGenBeamGas::Init() | |
57 | { | |
58 | // Initialize | |
59 | AliGenExtFile::Init(); | |
60 | } | |
61 | ||
62 | ||
63 | void AliGenBeamGas::Generate() | |
64 | { | |
65 | // Generate particles | |
66 | ||
67 | Float_t polar[3] = {0,0,0}; | |
68 | Float_t origin[3] = {0,0,0}; | |
69 | Float_t p[3]; | |
70 | Float_t random[2]; | |
71 | Int_t i, nt; | |
72 | Int_t nInt = 0; | |
73 | ||
74 | while(nInt < fInteractions) { | |
75 | // | |
76 | Rndm(random,2); | |
77 | // | |
78 | // Interaction vertex | |
79 | // | |
80 | origin[2] = 4000. * random[0] - 2000.; | |
81 | // | |
82 | // beam 1 or 2 | |
83 | // | |
84 | Float_t ibeam = (random[1] < 0.5) ? -1. : 1.; | |
85 | ||
86 | // | |
87 | // Read next event | |
88 | // | |
89 | Int_t nTracks = fReader->NextEvent(); | |
90 | if (nTracks == 0) { | |
91 | // printf("\n No more events !!! !\n"); | |
92 | Warning("AliGenBeamGas::Generate", | |
93 | "\nNo more events in external file!!!\n Last event may be empty or incomplete.\n"); | |
94 | return; | |
95 | } | |
96 | ||
97 | // | |
98 | // Stack filling loop | |
99 | // | |
100 | for (i = 0; i < nTracks; i++) { | |
101 | TParticle* iparticle = fReader->NextParticle(); | |
102 | p[0] = iparticle->Px(); | |
103 | p[1] = iparticle->Py(); | |
104 | p[2] = iparticle->Pz() * ibeam; | |
105 | ||
106 | Int_t idpart = iparticle->GetPdgCode(); | |
107 | Int_t decayed = iparticle->GetFirstDaughter(); | |
108 | Int_t doTracking = fTrackIt && (decayed < 0) && (TMath::Abs(idpart) > 10); | |
109 | SetTrack(doTracking,-1,idpart,p,origin,polar,0,kPPrimary,nt); | |
110 | KeepTrack(nt); | |
111 | } // track loop | |
112 | nInt++; | |
113 | } // event loop | |
114 | // | |
115 | SetHighWaterMark(nt); | |
116 | // | |
117 | CdEventFile(); | |
118 | } | |
119 | ||
120 | ||
121 | //AliGenBeamGas& AliGenBeamGas::operator=(const AliGenBeamGas& rhs) | |
122 | //{ | |
123 | // Assignment operator | |
124 | // return *this; | |
125 | //} | |
126 | ||
127 | ||
128 | ||
129 | ||
130 | ||
131 | ||
132 | ||
133 |