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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" |
aa4e331d | 37 | #include "AliStack.h" |
9ad9d6f5 | 38 | #include "AliGenEventHeader.h" |
5c3fd7ea | 39 | |
a48e3376 | 40 | #include <TParticle.h> |
693caace | 41 | #include <TFile.h> |
a48e3376 | 42 | #include <TTree.h> |
43 | ||
5c3fd7ea | 44 | |
198bb1c7 | 45 | ClassImp(AliGenExtFile) |
380956c5 | 46 | |
47 | AliGenExtFile::AliGenExtFile() | |
1c56e311 | 48 | :AliGenMC(), |
49 | fFileName(0), | |
50 | fReader(0) | |
693caace | 51 | { |
f87cfe57 | 52 | // Constructor |
693caace | 53 | // |
54 | // Read all particles | |
a48e3376 | 55 | fNpart =- 1; |
693caace | 56 | } |
57 | ||
58 | AliGenExtFile::AliGenExtFile(Int_t npart) | |
1c56e311 | 59 | :AliGenMC(npart), |
60 | fFileName(0), | |
61 | fReader(0) | |
693caace | 62 | { |
f87cfe57 | 63 | // Constructor |
a48e3376 | 64 | fName = "ExtFile"; |
65 | fTitle = "Primaries from ext. File"; | |
693caace | 66 | } |
67 | ||
68 | //____________________________________________________________ | |
69 | AliGenExtFile::~AliGenExtFile() | |
70 | { | |
f87cfe57 | 71 | // Destructor |
a48e3376 | 72 | delete fReader; |
693caace | 73 | } |
74 | ||
a48e3376 | 75 | //___________________________________________________________ |
76 | void AliGenExtFile::Init() | |
693caace | 77 | { |
a48e3376 | 78 | // Initialize |
79 | if (fReader) fReader->Init(); | |
693caace | 80 | } |
81 | ||
a48e3376 | 82 | |
693caace | 83 | void AliGenExtFile::Generate() |
84 | { | |
f87cfe57 | 85 | // Generate particles |
693caace | 86 | |
eed0bb9a | 87 | Double_t polar[3] = {0,0,0}; |
693caace | 88 | // |
eed0bb9a | 89 | Double_t origin[3] = {0,0,0}; |
1628e931 | 90 | Double_t p[4]; |
693caace | 91 | Float_t random[6]; |
88cb7938 | 92 | Int_t i = 0, j, nt; |
693caace | 93 | // |
4f23c932 | 94 | // |
95 | if (fVertexSmear == kPerEvent) Vertex(); | |
693caace | 96 | |
380956c5 | 97 | while(1) { |
98 | Int_t nTracks = fReader->NextEvent(); | |
99 | if (nTracks == 0) { | |
100 | // printf("\n No more events !!! !\n"); | |
101 | Warning("AliGenExtFile::Generate","\nNo more events in external file!!!\nLast event may be empty or incomplete.\n"); | |
693caace | 102 | return; |
380956c5 | 103 | } |
104 | ||
105 | // | |
106 | // Particle selection loop | |
107 | // | |
4f23c932 | 108 | // The selection criterium for the external file generator is as follows: |
380956c5 | 109 | // |
4f23c932 | 110 | // 1) All tracks are subject to the cuts defined by AliGenerator, i.e. |
380956c5 | 111 | // fThetaMin, fThetaMax, fPhiMin, fPhiMax, fPMin, fPMax, fPtMin, fPtMax, |
112 | // fYMin, fYMax. | |
113 | // If the particle does not satisfy these cuts, it is not put on the | |
114 | // stack. | |
115 | // 2) If fCutOnChild and some specific child is selected (e.g. if | |
116 | // fForceDecay==kSemiElectronic) the event is rejected if NOT EVEN ONE | |
117 | // child falls into the child-cuts. | |
88cb7938 | 118 | TParticle* iparticle = 0x0; |
119 | ||
380956c5 | 120 | if(fCutOnChild) { |
121 | // Count the selected children | |
122 | Int_t nSelected = 0; | |
4f23c932 | 123 | while ((iparticle=fReader->NextParticle()) ) { |
124 | Int_t kf = CheckPDGCode(iparticle->GetPdgCode()); | |
125 | kf = TMath::Abs(kf); | |
126 | if (ChildSelected(kf) && KinematicSelection(iparticle, 1)) { | |
127 | nSelected++; | |
128 | } | |
380956c5 | 129 | } |
130 | if (!nSelected) continue; // No particle selected: Go to next event | |
131 | fReader->RewindEvent(); | |
132 | } | |
a48e3376 | 133 | |
380956c5 | 134 | // |
135 | // Stack filling loop | |
136 | // | |
7cf36cae | 137 | fNprimaries = 0; |
380956c5 | 138 | for (i = 0; i < nTracks; i++) { |
ea79897e | 139 | TParticle* jparticle = fReader->NextParticle(); |
140 | Bool_t selected = KinematicSelection(jparticle,0); | |
4f23c932 | 141 | if (!selected) continue; |
ea79897e | 142 | p[0] = jparticle->Px(); |
143 | p[1] = jparticle->Py(); | |
144 | p[2] = jparticle->Pz(); | |
1628e931 | 145 | p[3] = jparticle->Energy(); |
146 | ||
b7a824ae | 147 | Int_t idpart = jparticle->GetPdgCode(); |
4f23c932 | 148 | if(fVertexSmear==kPerTrack) |
149 | { | |
150 | Rndm(random,6); | |
151 | for (j = 0; j < 3; j++) { | |
152 | origin[j]=fOrigin[j]+ | |
153 | fOsigma[j]*TMath::Cos(2*random[2*j]*TMath::Pi())* | |
154 | TMath::Sqrt(-2*TMath::Log(random[2*j+1])); | |
155 | } | |
380956c5 | 156 | } else { |
ea79897e | 157 | origin[0] = fVertex[0] + jparticle->Vx(); |
158 | origin[1] = fVertex[1] + jparticle->Vy(); | |
159 | origin[2] = fVertex[2] + jparticle->Vz(); | |
380956c5 | 160 | } |
eed0bb9a | 161 | Double_t tof = jparticle->T(); |
8f126362 | 162 | Int_t doTracking = fTrackIt && selected && (jparticle->TestBit(kTransportBit)); |
ea79897e | 163 | Int_t parent = jparticle->GetFirstMother(); |
4f23c932 | 164 | |
eed0bb9a | 165 | PushTrack(doTracking, parent, idpart, |
166 | p[0], p[1], p[2], p[3], origin[0], origin[1], origin[2], tof, | |
167 | polar[0], polar[1], polar[2], | |
168 | kPPrimary, nt, 1., jparticle->GetStatusCode()); | |
169 | ||
4f23c932 | 170 | KeepTrack(nt); |
7cf36cae | 171 | fNprimaries++; |
380956c5 | 172 | } // track loop |
0b05fbf9 | 173 | |
174 | // Generated event header | |
4f23c932 | 175 | |
0b05fbf9 | 176 | AliGenEventHeader * header = new AliGenEventHeader(); |
7cf36cae | 177 | header->SetNProduced(fNprimaries); |
0b05fbf9 | 178 | header->SetPrimaryVertex(fVertex); |
7cf36cae | 179 | AddHeader(header); |
380956c5 | 180 | break; |
4f23c932 | 181 | |
380956c5 | 182 | } // event loop |
4f23c932 | 183 | |
380956c5 | 184 | SetHighWaterMark(nt); |
2c354237 | 185 | CdEventFile(); |
186 | } | |
380956c5 | 187 | |
2c354237 | 188 | void AliGenExtFile::CdEventFile() |
189 | { | |
190 | // CD back to the event file | |
33c3c91a | 191 | AliRunLoader::Instance()->CdGAFile(); |
693caace | 192 | } |
193 | ||
194 | ||
693caace | 195 | |
196 | ||
197 |