SetSeed implementation
[u/mrichter/AliRoot.git] / EVGEN / AliGenCocktail.cxx
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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
88cb7938 16/* $Id$ */
4c039060 17
675e9664 18// Container class for AliGenerator through recursion.
19// Container is itself an AliGenerator.
20// What is stored are not the pointers to the generators directly but to objects of type
21// AliGenCocktail entry.
22// The class provides also iterator functionality.
23// Author: andreas.morsch@cern.ch
24//
25
116cbefd 26#include <TList.h>
27#include <TObjArray.h>
7c54213e 28#include <TFormula.h>
116cbefd 29
fe4da5cc 30#include "AliGenCocktail.h"
374924b5 31#include "AliGenCocktailEntry.h"
09e2e187 32#include "AliCollisionGeometry.h"
fe4da5cc 33#include "AliRun.h"
7c54213e 34#include "AliLog.h"
5d12ce38 35#include "AliMC.h"
4f85aa78 36#include "AliGenCocktailEventHeader.h"
fe4da5cc 37
38ClassImp(AliGenCocktail)
39
40AliGenCocktail::AliGenCocktail()
1c56e311 41 :AliGenerator(),
42 fNGenerators(0),
8058ead1 43 fTotalRate(0.),
ab834258 44 fSRandom(kFALSE),
1c56e311 45 fUsePerEventRate(kFALSE),
46 fProb(0),
47 fEntries(0),
48 flnk1(0),
49 flnk2(0),
50 fHeader(0)
fe4da5cc 51{
374924b5 52// Constructor
8b31bfac 53 fName = "Cocktail";
54 fTitle= "Particle Generator using cocktail of generators";
fe4da5cc 55}
56
fe4da5cc 57AliGenCocktail::~AliGenCocktail()
58{
374924b5 59// Destructor
fe4da5cc 60 delete fEntries;
373c1a55 61 fEntries = 0;
62 // delete fHeader; // It is removed in AliRunLoader
63 fHeader = 0;
fe4da5cc 64}
65
66void AliGenCocktail::
8c1efaa8 67AddGenerator(AliGenerator *Generator, const char* Name, Float_t RateExp, TFormula* formula, Int_t ntimes)
fe4da5cc 68{
69//
b1403e15 70// Add a generator to the list
71// First check that list exists
72 if (!fEntries) fEntries = new TList();
8058ead1 73 fTotalRate += RateExp;
b1403e15 74//
fe4da5cc 75// Forward parameters to the new generator
212bcf04 76 if(TestBit(kPtRange) && !(Generator->TestBit(kPtRange)) && !(Generator->TestBit(kMomentumRange)))
77 Generator->SetPtRange(fPtMin,fPtMax);
78 if(TestBit(kMomentumRange) && !(Generator->TestBit(kPtRange)) && !(Generator->TestBit(kMomentumRange)))
79 Generator->SetMomentumRange(fPMin,fPMax);
80
565cc9c0 81 if (TestBit(kYRange) && !(Generator->TestBit(kYRange)))
212bcf04 82 Generator->SetYRange(fYMin,fYMax);
565cc9c0 83 if (TestBit(kPhiRange) && !(Generator->TestBit(kPhiRange)))
212bcf04 84 Generator->SetPhiRange(fPhiMin*180/TMath::Pi(),fPhiMax*180/TMath::Pi());
565cc9c0 85 if (TestBit(kThetaRange) && !(Generator->TestBit(kThetaRange)) && !(Generator->TestBit(kEtaRange)))
212bcf04 86 Generator->SetThetaRange(fThetaMin*180/TMath::Pi(),fThetaMax*180/TMath::Pi());
2b597689 87 if (!(Generator->TestBit(kVertexRange))) {
212bcf04 88 Generator->SetOrigin(fOrigin[0], fOrigin[1], fOrigin[2]);
4a6ca8fc 89 Generator->SetSigma(fOsigma[0], fOsigma[1], fOsigma[2]);
90 Generator->SetVertexSmear(fVertexSmear);
91 Generator->SetVertexSource(kContainer);
92 }
c8f7f6f9 93 Generator->SetTrackingFlag(fTrackIt);
4f85aa78 94 Generator->SetContainer(this);
7c54213e 95
c97002cc 96
fe4da5cc 97//
98// Add generator to list
c5c3e4b0 99 char theName[256];
04a640a7 100 snprintf(theName, 256, "%s_%d",Name, fNGenerators);
c5c3e4b0 101 Generator->SetName(theName);
102
374924b5 103 AliGenCocktailEntry *entry =
fe4da5cc 104 new AliGenCocktailEntry(Generator, Name, RateExp);
8c1efaa8 105 if (formula) entry->SetFormula(formula);
106 entry->SetNTimes(ntimes);
374924b5 107 fEntries->Add(entry);
fe4da5cc 108 fNGenerators++;
373c1a55 109 flnk1 = 0;
110 flnk2 = 0;
ab834258 111 fSRandom = kFALSE;
373c1a55 112 fHeader = 0;
113}
fe4da5cc 114
115 void AliGenCocktail::Init()
374924b5 116{
117// Initialisation
118 TIter next(fEntries);
119 AliGenCocktailEntry *entry;
120 //
121 // Loop over generators and initialize
122 while((entry = (AliGenCocktailEntry*)next())) {
c97002cc 123 if (fStack) entry->Generator()->SetStack(fStack);
ab71c6e6 124 entry->Generator()->SetSeed(fSeed);
374924b5 125 entry->Generator()->Init();
126 }
1ebe6dc8 127
128 next.Reset();
129
ab834258 130 if (fSRandom) {
1ebe6dc8 131 fProb.Set(fNGenerators);
132 next.Reset();
133 Float_t sum = 0.;
134 while((entry = (AliGenCocktailEntry*)next())) {
135 sum += entry->Rate();
136 }
137
138 next.Reset();
139 Int_t i = 0;
140 Float_t psum = 0.;
141 while((entry = (AliGenCocktailEntry*)next())) {
142 psum += entry->Rate() / sum;
143 fProb[i++] = psum;
144 }
145 }
146 next.Reset();
374924b5 147}
fe4da5cc 148
09e2e187 149 void AliGenCocktail::FinishRun()
150{
151// Initialisation
152 TIter next(fEntries);
153 AliGenCocktailEntry *entry;
154 //
155 // Loop over generators and initialize
156 while((entry = (AliGenCocktailEntry*)next())) {
157 entry->Generator()->FinishRun();
158 }
159}
160
fe4da5cc 161 void AliGenCocktail::Generate()
374924b5 162{
163//
164// Generate event
165 TIter next(fEntries);
a8408367 166 AliGenCocktailEntry *entry = 0;
167 AliGenCocktailEntry *preventry = 0;
7c54213e 168 AliGenCocktailEntry *collentry = 0;
a8408367 169 AliGenerator* gen = 0;
4f85aa78 170 if (fHeader) delete fHeader;
c89fc3f1 171
172
4f85aa78 173 fHeader = new AliGenCocktailEventHeader("Cocktail Header");
09e2e187 174
d94af0c1 175 const TObjArray *partArray = gAlice->GetMCApp()->Particles();
c8f7f6f9 176
177//
178// Generate the vertex position used by all generators
179//
180 if(fVertexSmear == kPerEvent) Vertex();
181
67db3ff2 182 TArrayF eventVertex;
183 eventVertex.Set(3);
184 for (Int_t j=0; j < 3; j++) eventVertex[j] = fVertex[j];
185
ab834258 186 if (!fSRandom) {
1ebe6dc8 187 //
188 // Loop over generators and generate events
37098832 189 Int_t igen = 0;
1ebe6dc8 190 while((entry = (AliGenCocktailEntry*)next())) {
8c1efaa8 191 Int_t ntimes = entry->NTimes();
7c54213e 192 if (fUsePerEventRate && (gRandom->Rndm() > entry->Rate())) continue;
193
194 igen++;
195 if (igen ==1) {
196 entry->SetFirst(0);
197 } else {
198 entry->SetFirst((partArray->GetEntriesFast())+1);
199 }
200 gen = entry->Generator();
201 if (gen->ProvidesCollisionGeometry()) collentry = entry;
202 //
203 // Handle case in which current generator needs collision geometry from previous generator
204 //
205 if (gen->NeedsCollisionGeometry() && (entry->Formula() == 0))
a8408367 206 {
7c54213e 207 if (preventry && preventry->Generator()->ProvidesCollisionGeometry())
1ebe6dc8 208 {
7c54213e 209 gen->SetCollisionGeometry(preventry->Generator()->CollisionGeometry());
1ebe6dc8 210 } else {
7c54213e 211 Fatal("Generate()", "No Collision Geometry Provided");
212 }
213 }
214 //
215 // Number of signals is calculated from Collision Geometry
db051b0c 216 // and entry with given centrality bin is selected
7c54213e 217 //
218 if (entry->Formula() != 0)
219 {
220 if (!collentry) {
221 Fatal("Generate()", "No Collision Geometry Provided");
222 return;
223 }
224 AliCollisionGeometry* coll = (collentry->Generator())->CollisionGeometry();
225 Float_t b = coll->ImpactParameter();
226 Int_t nsig = Int_t(entry->Formula()->Eval(b));
db051b0c 227 Int_t bin = entry->Bin() - 100;
228 if (bin > 0) {
229 if (bin != nsig) continue;
230 } else {
231 if (nsig < 1) nsig = 1;
232 AliInfo(Form("Signal Events %13.3f %5d %5d\n", b, coll->HardScatters(), nsig));
233 ntimes = nsig;
234 }
a8408367 235 }
735e0707 236 gen->SetVertex(fVertex.At(0), fVertex.At(1), fVertex.At(2), fTime);
72cf8302 237
d5615b85 238 gen->GenerateN(ntimes);
7c54213e 239 entry->SetLast(partArray->GetEntriesFast());
240 preventry = entry;
241 }
ab834258 242 } else if (fSRandom) {
1ebe6dc8 243 //
244 // Select a generator randomly
245 //
246 Int_t i;
247 Float_t p0 = gRandom->Rndm();
248
249 for (i = 0; i < fNGenerators; i++) {
250 if (p0 < fProb[i]) break;
a8408367 251 }
1ebe6dc8 252
253 entry = (AliGenCocktailEntry*) fEntries->At(i);
254 entry->SetFirst(0);
255 gen = entry->Generator();
735e0707 256 gen->SetVertex(fVertex.At(0), fVertex.At(1), fVertex.At(2), fTime);
08bffa4d 257 gen->Generate();
374924b5 258 entry->SetLast(partArray->GetEntriesFast());
c89fc3f1 259 }
1ebe6dc8 260
374924b5 261 next.Reset();
4f85aa78 262
45c05df7 263 // Event Vertex
4f85aa78 264 fHeader->SetPrimaryVertex(eventVertex);
bcee5fdf 265 fHeader->CalcNProduced();
45c05df7 266 if (fContainer) {
267 fHeader->SetName(fName);
268 fContainer->AddHeader(fHeader);
269 } else {
270 gAlice->SetGenEventHeader(fHeader);
271 }
374924b5 272}
fe4da5cc 273
c44d1c08 274void AliGenCocktail::SetVertexSmear(VertexSmear_t smear)
275{
276// Set vertex smearing and propagate it to the generators
277
278 AliGenerator::SetVertexSmear(smear);
279 TIter next(fEntries);
280 while (AliGenCocktailEntry* entry = (AliGenCocktailEntry*)next()) {
281 entry->Generator()->SetVertexSmear(smear);
282 }
283}
284
fe4da5cc 285AliGenCocktailEntry * AliGenCocktail::FirstGenerator()
286{
374924b5 287// Iterator over generators: Initialisation
fe4da5cc 288 flnk1 = fEntries->FirstLink();
289 if (flnk1) {
290 return (AliGenCocktailEntry*) (flnk1->GetObject());
291 } else {
292 return 0;
293 }
294}
295
296AliGenCocktailEntry* AliGenCocktail::NextGenerator()
297{
374924b5 298// Iterator over generators: Increment
fe4da5cc 299 flnk1 = flnk1->Next();
300 if (flnk1) {
301 return (AliGenCocktailEntry*) (flnk1->GetObject());
302 } else {
303 return 0;
304 }
305}
306
307void AliGenCocktail::
308FirstGeneratorPair(AliGenCocktailEntry*& e1, AliGenCocktailEntry*& e2)
309{
374924b5 310// Iterator over generator pairs: Initialisation
fe4da5cc 311 flnk2 = flnk1 = fEntries->FirstLink();
312 if (flnk1) {
313 e2 = e1 = (AliGenCocktailEntry*) (flnk1->GetObject());
314 } else {
315 e2= e1 = 0;
316 }
317}
318
319void AliGenCocktail::
320NextGeneratorPair(AliGenCocktailEntry*& e1, AliGenCocktailEntry*& e2)
321{
374924b5 322// Iterator over generators: Increment
fe4da5cc 323 flnk2 = flnk2->Next();
324 if (flnk2) {
325 e1 = (AliGenCocktailEntry*) (flnk1->GetObject());
326 e2 = (AliGenCocktailEntry*) (flnk2->GetObject());
327 } else {
328 flnk2 = flnk1 = flnk1->Next();
329 if (flnk1) {
330 e1 = (AliGenCocktailEntry*) (flnk1->GetObject());
331 e2 = (AliGenCocktailEntry*) (flnk2->GetObject());
332 } else {
333 e1=0;
334 e2=0;
335 }
336 }
337}
338
4f85aa78 339void AliGenCocktail::AddHeader(AliGenEventHeader* header)
340{
341// Add a header to the list
342 if (fHeader) fHeader->AddHeader(header);
343}
fe4da5cc 344
198bb1c7 345
346
fe4da5cc 347