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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; | |
6256e5e7 | 49 | using std::map; |
50 | ||
198bb1c7 | 51 | ClassImp(AliGenExtFile) |
380956c5 | 52 | |
53 | AliGenExtFile::AliGenExtFile() | |
1c56e311 | 54 | :AliGenMC(), |
55 | fFileName(0), | |
9d188d33 | 56 | fReader(0), |
57 | fStartEvent(0) | |
693caace | 58 | { |
f87cfe57 | 59 | // Constructor |
693caace | 60 | // |
61 | // Read all particles | |
e1b35da7 | 62 | fNpart = -1; |
693caace | 63 | } |
64 | ||
65 | AliGenExtFile::AliGenExtFile(Int_t npart) | |
1c56e311 | 66 | :AliGenMC(npart), |
67 | fFileName(0), | |
9d188d33 | 68 | fReader(0), |
69 | fStartEvent(0) | |
693caace | 70 | { |
f87cfe57 | 71 | // Constructor |
a48e3376 | 72 | fName = "ExtFile"; |
73 | fTitle = "Primaries from ext. File"; | |
693caace | 74 | } |
75 | ||
76 | //____________________________________________________________ | |
77 | AliGenExtFile::~AliGenExtFile() | |
78 | { | |
f87cfe57 | 79 | // Destructor |
a48e3376 | 80 | delete fReader; |
693caace | 81 | } |
82 | ||
a48e3376 | 83 | //___________________________________________________________ |
84 | void AliGenExtFile::Init() | |
693caace | 85 | { |
a48e3376 | 86 | // Initialize |
87 | if (fReader) fReader->Init(); | |
693caace | 88 | } |
89 | ||
9d188d33 | 90 | //___________________________________________________________ |
693caace | 91 | void AliGenExtFile::Generate() |
92 | { | |
f87cfe57 | 93 | // Generate particles |
693caace | 94 | |
eed0bb9a | 95 | Double_t polar[3] = {0,0,0}; |
693caace | 96 | // |
eed0bb9a | 97 | Double_t origin[3] = {0,0,0}; |
21391258 | 98 | Double_t time = 0.; |
1628e931 | 99 | Double_t p[4]; |
693caace | 100 | Float_t random[6]; |
df2fcbcb | 101 | Int_t i=0, j, nt; |
693caace | 102 | // |
4f23c932 | 103 | // |
104 | if (fVertexSmear == kPerEvent) Vertex(); | |
693caace | 105 | |
9d188d33 | 106 | // Fast forward up to start Event |
107 | for (Int_t ie=0; ie<fStartEvent; ++ie ) { | |
108 | Int_t nTracks = fReader->NextEvent(); | |
109 | if (nTracks == 0) { | |
110 | // printf("\n No more events !!! !\n"); | |
111 | Warning("AliGenExtFile::Generate","\nNo more events in external file!!!\nLast event may be empty or incomplete.\n"); | |
112 | return; | |
113 | } | |
df2fcbcb | 114 | for (i = 0; i < nTracks; ++i) { |
3ff7721b | 115 | if (NULL == fReader->NextParticle()) |
116 | AliFatal("Error while skipping tracks"); | |
117 | } | |
9d188d33 | 118 | cout << "Skipping event " << ie << endl; |
119 | } | |
3ff7721b | 120 | fStartEvent = 0; // do not skip events the second time |
9d188d33 | 121 | |
380956c5 | 122 | while(1) { |
123 | Int_t nTracks = fReader->NextEvent(); | |
124 | if (nTracks == 0) { | |
125 | // printf("\n No more events !!! !\n"); | |
126 | Warning("AliGenExtFile::Generate","\nNo more events in external file!!!\nLast event may be empty or incomplete.\n"); | |
693caace | 127 | return; |
380956c5 | 128 | } |
129 | ||
130 | // | |
131 | // Particle selection loop | |
132 | // | |
4f23c932 | 133 | // The selection criterium for the external file generator is as follows: |
380956c5 | 134 | // |
4f23c932 | 135 | // 1) All tracks are subject to the cuts defined by AliGenerator, i.e. |
380956c5 | 136 | // fThetaMin, fThetaMax, fPhiMin, fPhiMax, fPMin, fPMax, fPtMin, fPtMax, |
137 | // fYMin, fYMax. | |
138 | // If the particle does not satisfy these cuts, it is not put on the | |
139 | // stack. | |
140 | // 2) If fCutOnChild and some specific child is selected (e.g. if | |
141 | // fForceDecay==kSemiElectronic) the event is rejected if NOT EVEN ONE | |
142 | // child falls into the child-cuts. | |
88cb7938 | 143 | TParticle* iparticle = 0x0; |
144 | ||
380956c5 | 145 | if(fCutOnChild) { |
146 | // Count the selected children | |
147 | Int_t nSelected = 0; | |
4f23c932 | 148 | while ((iparticle=fReader->NextParticle()) ) { |
149 | Int_t kf = CheckPDGCode(iparticle->GetPdgCode()); | |
150 | kf = TMath::Abs(kf); | |
151 | if (ChildSelected(kf) && KinematicSelection(iparticle, 1)) { | |
152 | nSelected++; | |
153 | } | |
380956c5 | 154 | } |
155 | if (!nSelected) continue; // No particle selected: Go to next event | |
156 | fReader->RewindEvent(); | |
157 | } | |
a48e3376 | 158 | |
0d1e7588 | 159 | // |
160 | // Stack selection loop | |
161 | // | |
162 | class SelectorLogic { // need to do recursive back tracking, requires a "nested" function | |
163 | private: | |
5263658e | 164 | Int_t idCount; |
0d1e7588 | 165 | map<Int_t,Int_t> firstMotherMap; |
166 | map<Int_t,Int_t> secondMotherMap; | |
167 | map<Int_t,Bool_t> selectedIdMap; | |
5263658e | 168 | map<Int_t,Int_t> newIdMap; |
0d1e7588 | 169 | void selectMothersToo(Int_t particleId) { |
89c6e78b | 170 | Int_t mum1 = firstMotherMap[particleId]; |
0d1e7588 | 171 | if (mum1 > -1 && !selectedIdMap[mum1]) { |
172 | selectedIdMap[mum1] = true; | |
173 | selectMothersToo(mum1); | |
174 | } | |
175 | Int_t mum2 = secondMotherMap[particleId]; | |
176 | if (mum2 > -1 && !selectedIdMap[mum2]) { | |
177 | selectedIdMap[mum2] = true; | |
178 | selectMothersToo(mum2); | |
179 | } | |
180 | } | |
181 | public: | |
89c6e78b | 182 | SelectorLogic():idCount(0), firstMotherMap(), secondMotherMap(), selectedIdMap(), newIdMap() {} |
183 | void init() { | |
5263658e | 184 | idCount = 0; |
185 | } | |
0d1e7588 | 186 | void setData(Int_t id, Int_t mum1, Int_t mum2, Bool_t selected) { |
5263658e | 187 | idCount++; // we know that this function is called in succession of ids, so counting is fine to determine max id |
0d1e7588 | 188 | firstMotherMap[id] = mum1; |
189 | secondMotherMap[id] = mum2; | |
190 | selectedIdMap[id] = selected; | |
5263658e | 191 | } |
192 | void reselectCuttedMothersAndRemapIDs() { | |
193 | for (Int_t id = 0; id < idCount; ++id) { | |
194 | if (selectedIdMap[id]) { | |
195 | selectMothersToo(id); | |
196 | } | |
197 | } | |
89c6e78b | 198 | Int_t newId0 = 0; |
5263658e | 199 | for (Int_t id = 0; id < idCount; id++) { |
200 | if (selectedIdMap[id]) { | |
89c6e78b | 201 | newIdMap[id] = newId0; ++newId0; |
396b3bc9 | 202 | } else { |
203 | newIdMap[id] = -1; | |
5263658e | 204 | } |
0d1e7588 | 205 | } |
206 | } | |
207 | Bool_t isSelected(Int_t id) { | |
208 | return selectedIdMap[id]; | |
209 | } | |
5263658e | 210 | Int_t newId(Int_t id) { |
211 | if (id == -1) return -1; | |
212 | return newIdMap[id]; | |
213 | } | |
0d1e7588 | 214 | }; |
215 | SelectorLogic selector; | |
5263658e | 216 | selector.init(); |
df2fcbcb | 217 | for (i = 0; i < nTracks; i++) { |
0d1e7588 | 218 | TParticle* jparticle = fReader->NextParticle(); |
219 | selector.setData(i, | |
220 | jparticle->GetFirstMother(), | |
221 | jparticle->GetSecondMother(), | |
222 | KinematicSelection(jparticle,0)); | |
223 | } | |
5263658e | 224 | selector.reselectCuttedMothersAndRemapIDs(); |
0d1e7588 | 225 | fReader->RewindEvent(); |
226 | ||
380956c5 | 227 | // |
228 | // Stack filling loop | |
229 | // | |
7cf36cae | 230 | fNprimaries = 0; |
380956c5 | 231 | for (i = 0; i < nTracks; i++) { |
bce6240d | 232 | TParticle* jparticle = fReader->NextParticle(); |
0d1e7588 | 233 | Bool_t selected = selector.isSelected(i); |
bce6240d | 234 | if (!selected) { |
bce6240d | 235 | continue; |
236 | } | |
5263658e | 237 | Int_t parent = selector.newId(jparticle->GetFirstMother()); |
238 | // printf("particle %d -> %d, with mother %d -> %d\n", i, selector.newId(i), jparticle->GetFirstMother(), parent); | |
bce6240d | 239 | |
ea79897e | 240 | p[0] = jparticle->Px(); |
241 | p[1] = jparticle->Py(); | |
242 | p[2] = jparticle->Pz(); | |
1628e931 | 243 | p[3] = jparticle->Energy(); |
244 | ||
b7a824ae | 245 | Int_t idpart = jparticle->GetPdgCode(); |
4f23c932 | 246 | if(fVertexSmear==kPerTrack) |
247 | { | |
248 | Rndm(random,6); | |
249 | for (j = 0; j < 3; j++) { | |
250 | origin[j]=fOrigin[j]+ | |
251 | fOsigma[j]*TMath::Cos(2*random[2*j]*TMath::Pi())* | |
252 | TMath::Sqrt(-2*TMath::Log(random[2*j+1])); | |
253 | } | |
21391258 | 254 | Rndm(random,2); |
255 | time = fTimeOrigin + fOsigma[2]/TMath::Ccgs()* | |
256 | TMath::Cos(2*random[0]*TMath::Pi())* | |
257 | TMath::Sqrt(-2*TMath::Log(random[1])); | |
380956c5 | 258 | } else { |
ea79897e | 259 | origin[0] = fVertex[0] + jparticle->Vx(); |
260 | origin[1] = fVertex[1] + jparticle->Vy(); | |
261 | origin[2] = fVertex[2] + jparticle->Vz(); | |
21391258 | 262 | time = fTime + jparticle->T(); |
380956c5 | 263 | } |
8f126362 | 264 | Int_t doTracking = fTrackIt && selected && (jparticle->TestBit(kTransportBit)); |
4f23c932 | 265 | |
eed0bb9a | 266 | PushTrack(doTracking, parent, idpart, |
21391258 | 267 | p[0], p[1], p[2], p[3], origin[0], origin[1], origin[2], time, |
eed0bb9a | 268 | polar[0], polar[1], polar[2], |
269 | kPPrimary, nt, 1., jparticle->GetStatusCode()); | |
270 | ||
4f23c932 | 271 | KeepTrack(nt); |
7cf36cae | 272 | fNprimaries++; |
380956c5 | 273 | } // track loop |
0b05fbf9 | 274 | |
275 | // Generated event header | |
7a005d69 | 276 | AliGenEventHeader * header = fReader->GetGenEventHeader(); |
277 | if (!header) header = new AliGenEventHeader(); | |
7cf36cae | 278 | header->SetNProduced(fNprimaries); |
0b05fbf9 | 279 | header->SetPrimaryVertex(fVertex); |
21391258 | 280 | header->SetInteractionTime(fTime); |
7cf36cae | 281 | AddHeader(header); |
380956c5 | 282 | break; |
4f23c932 | 283 | |
380956c5 | 284 | } // event loop |
4f23c932 | 285 | |
380956c5 | 286 | SetHighWaterMark(nt); |
2c354237 | 287 | CdEventFile(); |
288 | } | |
380956c5 | 289 | |
9d188d33 | 290 | //___________________________________________________________ |
2c354237 | 291 | void AliGenExtFile::CdEventFile() |
292 | { | |
293 | // CD back to the event file | |
33c3c91a | 294 | AliRunLoader::Instance()->CdGAFile(); |
693caace | 295 | } |
296 | ||
297 | ||
693caace | 298 | |
299 | ||
300 |