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4c039060 | 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 | ||
25454878 | 16 | /* $Id$ */ |
675e9664 | 17 | |
a48e3376 | 18 | // Event generator that using an instance of type AliGenReader |
25454878 | 19 | // reads particles from a file and applies cuts. |
20 | // Example: In your Config.C you can include the following lines | |
4f23c932 | 21 | // AliGenExtFile *gener = new AliGenExtFile(-1); |
25454878 | 22 | // gener->SetMomentumRange(0,999); |
23 | // gener->SetPhiRange(-180.,180.); | |
24 | // gener->SetThetaRange(0,180); | |
25 | // gener->SetYRange(-999,999); | |
26 | // AliGenReaderTreeK * reader = new AliGenReaderTreeK(); | |
27 | // reader->SetFileName("myFileWithTreeK.root"); | |
28 | // gener->SetReader(reader); | |
29 | // gener->Init(); | |
30 | ||
675e9664 | 31 | |
159ec319 | 32 | #include <Riostream.h> |
084c1b4a | 33 | |
693caace | 34 | #include "AliGenExtFile.h" |
4f23c932 | 35 | #include "AliRunLoader.h" |
9ad9d6f5 | 36 | #include "AliHeader.h" |
37 | #include "AliGenEventHeader.h" | |
5c3fd7ea | 38 | |
a48e3376 | 39 | #include <TParticle.h> |
693caace | 40 | #include <TFile.h> |
a48e3376 | 41 | #include <TTree.h> |
42 | ||
5c3fd7ea | 43 | |
198bb1c7 | 44 | ClassImp(AliGenExtFile) |
380956c5 | 45 | |
46 | AliGenExtFile::AliGenExtFile() | |
1c56e311 | 47 | :AliGenMC(), |
48 | fFileName(0), | |
49 | fReader(0) | |
693caace | 50 | { |
f87cfe57 | 51 | // Constructor |
693caace | 52 | // |
53 | // Read all particles | |
a48e3376 | 54 | fNpart =- 1; |
693caace | 55 | } |
56 | ||
57 | AliGenExtFile::AliGenExtFile(Int_t npart) | |
1c56e311 | 58 | :AliGenMC(npart), |
59 | fFileName(0), | |
60 | fReader(0) | |
693caace | 61 | { |
f87cfe57 | 62 | // Constructor |
a48e3376 | 63 | fName = "ExtFile"; |
64 | fTitle = "Primaries from ext. File"; | |
693caace | 65 | } |
66 | ||
67 | //____________________________________________________________ | |
68 | AliGenExtFile::~AliGenExtFile() | |
69 | { | |
f87cfe57 | 70 | // Destructor |
a48e3376 | 71 | delete fReader; |
693caace | 72 | } |
73 | ||
a48e3376 | 74 | //___________________________________________________________ |
75 | void AliGenExtFile::Init() | |
693caace | 76 | { |
a48e3376 | 77 | // Initialize |
78 | if (fReader) fReader->Init(); | |
693caace | 79 | } |
80 | ||
a48e3376 | 81 | |
693caace | 82 | void AliGenExtFile::Generate() |
83 | { | |
f87cfe57 | 84 | // Generate particles |
693caace | 85 | |
a48e3376 | 86 | Float_t polar[3] = {0,0,0}; |
693caace | 87 | // |
a48e3376 | 88 | Float_t origin[3] = {0,0,0}; |
693caace | 89 | Float_t p[3]; |
90 | Float_t random[6]; | |
88cb7938 | 91 | Int_t i = 0, j, nt; |
693caace | 92 | // |
4f23c932 | 93 | // |
94 | if (fVertexSmear == kPerEvent) Vertex(); | |
693caace | 95 | |
380956c5 | 96 | while(1) { |
97 | Int_t nTracks = fReader->NextEvent(); | |
98 | if (nTracks == 0) { | |
99 | // printf("\n No more events !!! !\n"); | |
100 | Warning("AliGenExtFile::Generate","\nNo more events in external file!!!\nLast event may be empty or incomplete.\n"); | |
693caace | 101 | return; |
380956c5 | 102 | } |
103 | ||
104 | // | |
105 | // Particle selection loop | |
106 | // | |
4f23c932 | 107 | // The selection criterium for the external file generator is as follows: |
380956c5 | 108 | // |
4f23c932 | 109 | // 1) All tracks are subject to the cuts defined by AliGenerator, i.e. |
380956c5 | 110 | // fThetaMin, fThetaMax, fPhiMin, fPhiMax, fPMin, fPMax, fPtMin, fPtMax, |
111 | // fYMin, fYMax. | |
112 | // If the particle does not satisfy these cuts, it is not put on the | |
113 | // stack. | |
114 | // 2) If fCutOnChild and some specific child is selected (e.g. if | |
115 | // fForceDecay==kSemiElectronic) the event is rejected if NOT EVEN ONE | |
116 | // child falls into the child-cuts. | |
88cb7938 | 117 | TParticle* iparticle = 0x0; |
118 | ||
380956c5 | 119 | if(fCutOnChild) { |
120 | // Count the selected children | |
121 | Int_t nSelected = 0; | |
4f23c932 | 122 | while ((iparticle=fReader->NextParticle()) ) { |
123 | Int_t kf = CheckPDGCode(iparticle->GetPdgCode()); | |
124 | kf = TMath::Abs(kf); | |
125 | if (ChildSelected(kf) && KinematicSelection(iparticle, 1)) { | |
126 | nSelected++; | |
127 | } | |
380956c5 | 128 | } |
129 | if (!nSelected) continue; // No particle selected: Go to next event | |
130 | fReader->RewindEvent(); | |
131 | } | |
a48e3376 | 132 | |
380956c5 | 133 | // |
134 | // Stack filling loop | |
135 | // | |
7cf36cae | 136 | fNprimaries = 0; |
380956c5 | 137 | for (i = 0; i < nTracks; i++) { |
ea79897e | 138 | TParticle* jparticle = fReader->NextParticle(); |
139 | Bool_t selected = KinematicSelection(jparticle,0); | |
4f23c932 | 140 | if (!selected) continue; |
ea79897e | 141 | p[0] = jparticle->Px(); |
142 | p[1] = jparticle->Py(); | |
143 | p[2] = jparticle->Pz(); | |
b7a824ae | 144 | Int_t idpart = jparticle->GetPdgCode(); |
4f23c932 | 145 | if(fVertexSmear==kPerTrack) |
146 | { | |
147 | Rndm(random,6); | |
148 | for (j = 0; j < 3; j++) { | |
149 | origin[j]=fOrigin[j]+ | |
150 | fOsigma[j]*TMath::Cos(2*random[2*j]*TMath::Pi())* | |
151 | TMath::Sqrt(-2*TMath::Log(random[2*j+1])); | |
152 | } | |
380956c5 | 153 | } else { |
ea79897e | 154 | origin[0] = fVertex[0] + jparticle->Vx(); |
155 | origin[1] = fVertex[1] + jparticle->Vy(); | |
156 | origin[2] = fVertex[2] + jparticle->Vz(); | |
380956c5 | 157 | } |
4f23c932 | 158 | |
ea79897e | 159 | Int_t decayed = jparticle->GetFirstDaughter(); |
4f23c932 | 160 | Int_t doTracking = fTrackIt && (decayed < 0) && (TMath::Abs(idpart) > 10) && selected; |
ea79897e | 161 | Int_t parent = jparticle->GetFirstMother(); |
4f23c932 | 162 | |
ea79897e | 163 | PushTrack(doTracking, parent, idpart, p, origin, polar, 0, kPPrimary, nt); |
4f23c932 | 164 | KeepTrack(nt); |
7cf36cae | 165 | fNprimaries++; |
380956c5 | 166 | } // track loop |
0b05fbf9 | 167 | |
168 | // Generated event header | |
4f23c932 | 169 | |
0b05fbf9 | 170 | AliGenEventHeader * header = new AliGenEventHeader(); |
7cf36cae | 171 | header->SetNProduced(fNprimaries); |
0b05fbf9 | 172 | header->SetPrimaryVertex(fVertex); |
7cf36cae | 173 | AddHeader(header); |
380956c5 | 174 | break; |
4f23c932 | 175 | |
380956c5 | 176 | } // event loop |
4f23c932 | 177 | |
380956c5 | 178 | SetHighWaterMark(nt); |
2c354237 | 179 | CdEventFile(); |
180 | } | |
380956c5 | 181 | |
2c354237 | 182 | void AliGenExtFile::CdEventFile() |
183 | { | |
184 | // CD back to the event file | |
4f23c932 | 185 | (AliRunLoader::GetRunLoader())->CdGAFile(); |
693caace | 186 | } |
187 | ||
188 | ||
693caace | 189 | |
190 | ||
191 |