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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 | |
3ff7721b | 34 | #include "AliLog.h" |
693caace | 35 | #include "AliGenExtFile.h" |
4f23c932 | 36 | #include "AliRunLoader.h" |
9ad9d6f5 | 37 | #include "AliHeader.h" |
aa4e331d | 38 | #include "AliStack.h" |
9ad9d6f5 | 39 | #include "AliGenEventHeader.h" |
4a33c50d | 40 | #include "AliGenReader.h" |
5c3fd7ea | 41 | |
a48e3376 | 42 | #include <TParticle.h> |
693caace | 43 | #include <TFile.h> |
a48e3376 | 44 | #include <TTree.h> |
45 | ||
5c3fd7ea | 46 | |
83cb58d0 | 47 | using std::cout; |
48 | using std::endl; | |
198bb1c7 | 49 | ClassImp(AliGenExtFile) |
380956c5 | 50 | |
51 | AliGenExtFile::AliGenExtFile() | |
1c56e311 | 52 | :AliGenMC(), |
53 | fFileName(0), | |
9d188d33 | 54 | fReader(0), |
55 | fStartEvent(0) | |
693caace | 56 | { |
f87cfe57 | 57 | // Constructor |
693caace | 58 | // |
59 | // Read all particles | |
e1b35da7 | 60 | fNpart = -1; |
693caace | 61 | } |
62 | ||
63 | AliGenExtFile::AliGenExtFile(Int_t npart) | |
1c56e311 | 64 | :AliGenMC(npart), |
65 | fFileName(0), | |
9d188d33 | 66 | fReader(0), |
67 | fStartEvent(0) | |
693caace | 68 | { |
f87cfe57 | 69 | // Constructor |
a48e3376 | 70 | fName = "ExtFile"; |
71 | fTitle = "Primaries from ext. File"; | |
693caace | 72 | } |
73 | ||
74 | //____________________________________________________________ | |
75 | AliGenExtFile::~AliGenExtFile() | |
76 | { | |
f87cfe57 | 77 | // Destructor |
a48e3376 | 78 | delete fReader; |
693caace | 79 | } |
80 | ||
a48e3376 | 81 | //___________________________________________________________ |
82 | void AliGenExtFile::Init() | |
693caace | 83 | { |
a48e3376 | 84 | // Initialize |
85 | if (fReader) fReader->Init(); | |
693caace | 86 | } |
87 | ||
9d188d33 | 88 | //___________________________________________________________ |
693caace | 89 | void AliGenExtFile::Generate() |
90 | { | |
f87cfe57 | 91 | // Generate particles |
693caace | 92 | |
eed0bb9a | 93 | Double_t polar[3] = {0,0,0}; |
693caace | 94 | // |
eed0bb9a | 95 | Double_t origin[3] = {0,0,0}; |
21391258 | 96 | Double_t time = 0.; |
1628e931 | 97 | Double_t p[4]; |
693caace | 98 | Float_t random[6]; |
88cb7938 | 99 | Int_t i = 0, j, nt; |
693caace | 100 | // |
4f23c932 | 101 | // |
102 | if (fVertexSmear == kPerEvent) Vertex(); | |
693caace | 103 | |
9d188d33 | 104 | // Fast forward up to start Event |
105 | for (Int_t ie=0; ie<fStartEvent; ++ie ) { | |
106 | Int_t nTracks = fReader->NextEvent(); | |
107 | if (nTracks == 0) { | |
108 | // printf("\n No more events !!! !\n"); | |
109 | Warning("AliGenExtFile::Generate","\nNo more events in external file!!!\nLast event may be empty or incomplete.\n"); | |
110 | return; | |
111 | } | |
3ff7721b | 112 | for (Int_t i=0; i<nTracks; ++i) { |
113 | if (NULL == fReader->NextParticle()) | |
114 | AliFatal("Error while skipping tracks"); | |
115 | } | |
9d188d33 | 116 | cout << "Skipping event " << ie << endl; |
117 | } | |
3ff7721b | 118 | fStartEvent = 0; // do not skip events the second time |
9d188d33 | 119 | |
380956c5 | 120 | while(1) { |
121 | Int_t nTracks = fReader->NextEvent(); | |
122 | if (nTracks == 0) { | |
123 | // printf("\n No more events !!! !\n"); | |
124 | Warning("AliGenExtFile::Generate","\nNo more events in external file!!!\nLast event may be empty or incomplete.\n"); | |
693caace | 125 | return; |
380956c5 | 126 | } |
127 | ||
128 | // | |
129 | // Particle selection loop | |
130 | // | |
4f23c932 | 131 | // The selection criterium for the external file generator is as follows: |
380956c5 | 132 | // |
4f23c932 | 133 | // 1) All tracks are subject to the cuts defined by AliGenerator, i.e. |
380956c5 | 134 | // fThetaMin, fThetaMax, fPhiMin, fPhiMax, fPMin, fPMax, fPtMin, fPtMax, |
135 | // fYMin, fYMax. | |
136 | // If the particle does not satisfy these cuts, it is not put on the | |
137 | // stack. | |
138 | // 2) If fCutOnChild and some specific child is selected (e.g. if | |
139 | // fForceDecay==kSemiElectronic) the event is rejected if NOT EVEN ONE | |
140 | // child falls into the child-cuts. | |
88cb7938 | 141 | TParticle* iparticle = 0x0; |
142 | ||
380956c5 | 143 | if(fCutOnChild) { |
144 | // Count the selected children | |
145 | Int_t nSelected = 0; | |
4f23c932 | 146 | while ((iparticle=fReader->NextParticle()) ) { |
147 | Int_t kf = CheckPDGCode(iparticle->GetPdgCode()); | |
148 | kf = TMath::Abs(kf); | |
149 | if (ChildSelected(kf) && KinematicSelection(iparticle, 1)) { | |
150 | nSelected++; | |
151 | } | |
380956c5 | 152 | } |
153 | if (!nSelected) continue; // No particle selected: Go to next event | |
154 | fReader->RewindEvent(); | |
155 | } | |
a48e3376 | 156 | |
380956c5 | 157 | // |
158 | // Stack filling loop | |
159 | // | |
7cf36cae | 160 | fNprimaries = 0; |
380956c5 | 161 | for (i = 0; i < nTracks; i++) { |
ea79897e | 162 | TParticle* jparticle = fReader->NextParticle(); |
163 | Bool_t selected = KinematicSelection(jparticle,0); | |
4f23c932 | 164 | if (!selected) continue; |
ea79897e | 165 | p[0] = jparticle->Px(); |
166 | p[1] = jparticle->Py(); | |
167 | p[2] = jparticle->Pz(); | |
1628e931 | 168 | p[3] = jparticle->Energy(); |
169 | ||
b7a824ae | 170 | Int_t idpart = jparticle->GetPdgCode(); |
4f23c932 | 171 | if(fVertexSmear==kPerTrack) |
172 | { | |
173 | Rndm(random,6); | |
174 | for (j = 0; j < 3; j++) { | |
175 | origin[j]=fOrigin[j]+ | |
176 | fOsigma[j]*TMath::Cos(2*random[2*j]*TMath::Pi())* | |
177 | TMath::Sqrt(-2*TMath::Log(random[2*j+1])); | |
178 | } | |
21391258 | 179 | Rndm(random,2); |
180 | time = fTimeOrigin + fOsigma[2]/TMath::Ccgs()* | |
181 | TMath::Cos(2*random[0]*TMath::Pi())* | |
182 | TMath::Sqrt(-2*TMath::Log(random[1])); | |
380956c5 | 183 | } else { |
ea79897e | 184 | origin[0] = fVertex[0] + jparticle->Vx(); |
185 | origin[1] = fVertex[1] + jparticle->Vy(); | |
186 | origin[2] = fVertex[2] + jparticle->Vz(); | |
21391258 | 187 | time = fTime + jparticle->T(); |
380956c5 | 188 | } |
8f126362 | 189 | Int_t doTracking = fTrackIt && selected && (jparticle->TestBit(kTransportBit)); |
ea79897e | 190 | Int_t parent = jparticle->GetFirstMother(); |
4f23c932 | 191 | |
eed0bb9a | 192 | PushTrack(doTracking, parent, idpart, |
21391258 | 193 | p[0], p[1], p[2], p[3], origin[0], origin[1], origin[2], time, |
eed0bb9a | 194 | polar[0], polar[1], polar[2], |
195 | kPPrimary, nt, 1., jparticle->GetStatusCode()); | |
196 | ||
4f23c932 | 197 | KeepTrack(nt); |
7cf36cae | 198 | fNprimaries++; |
380956c5 | 199 | } // track loop |
0b05fbf9 | 200 | |
201 | // Generated event header | |
4f23c932 | 202 | |
0b05fbf9 | 203 | AliGenEventHeader * header = new AliGenEventHeader(); |
7cf36cae | 204 | header->SetNProduced(fNprimaries); |
0b05fbf9 | 205 | header->SetPrimaryVertex(fVertex); |
21391258 | 206 | header->SetInteractionTime(fTime); |
7cf36cae | 207 | AddHeader(header); |
380956c5 | 208 | break; |
4f23c932 | 209 | |
380956c5 | 210 | } // event loop |
4f23c932 | 211 | |
380956c5 | 212 | SetHighWaterMark(nt); |
2c354237 | 213 | CdEventFile(); |
214 | } | |
380956c5 | 215 | |
9d188d33 | 216 | //___________________________________________________________ |
2c354237 | 217 | void AliGenExtFile::CdEventFile() |
218 | { | |
219 | // CD back to the event file | |
33c3c91a | 220 | AliRunLoader::Instance()->CdGAFile(); |
693caace | 221 | } |
222 | ||
223 | ||
693caace | 224 | |
225 | ||
226 |