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[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.),
1c56e311 44 fRandom(kFALSE),
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::
7c54213e 67AddGenerator(AliGenerator *Generator, const char* Name, Float_t RateExp, TFormula* formula)
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);
7c54213e 105 if (formula) entry->SetFormula(formula);
374924b5 106 fEntries->Add(entry);
fe4da5cc 107 fNGenerators++;
373c1a55 108 flnk1 = 0;
109 flnk2 = 0;
110 fRandom = kFALSE;
111 fHeader = 0;
112}
fe4da5cc 113
114 void AliGenCocktail::Init()
374924b5 115{
116// Initialisation
117 TIter next(fEntries);
118 AliGenCocktailEntry *entry;
119 //
120 // Loop over generators and initialize
121 while((entry = (AliGenCocktailEntry*)next())) {
c97002cc 122 if (fStack) entry->Generator()->SetStack(fStack);
374924b5 123 entry->Generator()->Init();
124 }
1ebe6dc8 125
126 next.Reset();
127
128 if (fRandom) {
129 fProb.Set(fNGenerators);
130 next.Reset();
131 Float_t sum = 0.;
132 while((entry = (AliGenCocktailEntry*)next())) {
133 sum += entry->Rate();
134 }
135
136 next.Reset();
137 Int_t i = 0;
138 Float_t psum = 0.;
139 while((entry = (AliGenCocktailEntry*)next())) {
140 psum += entry->Rate() / sum;
141 fProb[i++] = psum;
142 }
143 }
144 next.Reset();
374924b5 145}
fe4da5cc 146
09e2e187 147 void AliGenCocktail::FinishRun()
148{
149// Initialisation
150 TIter next(fEntries);
151 AliGenCocktailEntry *entry;
152 //
153 // Loop over generators and initialize
154 while((entry = (AliGenCocktailEntry*)next())) {
155 entry->Generator()->FinishRun();
156 }
157}
158
fe4da5cc 159 void AliGenCocktail::Generate()
374924b5 160{
161//
162// Generate event
163 TIter next(fEntries);
a8408367 164 AliGenCocktailEntry *entry = 0;
165 AliGenCocktailEntry *preventry = 0;
7c54213e 166 AliGenCocktailEntry *collentry = 0;
a8408367 167 AliGenerator* gen = 0;
4f85aa78 168 if (fHeader) delete fHeader;
c89fc3f1 169
170
4f85aa78 171 fHeader = new AliGenCocktailEventHeader("Cocktail Header");
09e2e187 172
d94af0c1 173 const TObjArray *partArray = gAlice->GetMCApp()->Particles();
c8f7f6f9 174
175//
176// Generate the vertex position used by all generators
177//
178 if(fVertexSmear == kPerEvent) Vertex();
179
67db3ff2 180 TArrayF eventVertex;
181 eventVertex.Set(3);
182 for (Int_t j=0; j < 3; j++) eventVertex[j] = fVertex[j];
183
1ebe6dc8 184 if (!fRandom) {
185 //
186 // Loop over generators and generate events
37098832 187 Int_t igen = 0;
1ebe6dc8 188 while((entry = (AliGenCocktailEntry*)next())) {
72cf8302 189 Int_t ntimes = 1;
7c54213e 190 if (fUsePerEventRate && (gRandom->Rndm() > entry->Rate())) continue;
191
192 igen++;
193 if (igen ==1) {
194 entry->SetFirst(0);
195 } else {
196 entry->SetFirst((partArray->GetEntriesFast())+1);
197 }
198 gen = entry->Generator();
199 if (gen->ProvidesCollisionGeometry()) collentry = entry;
200 //
201 // Handle case in which current generator needs collision geometry from previous generator
202 //
203 if (gen->NeedsCollisionGeometry() && (entry->Formula() == 0))
a8408367 204 {
7c54213e 205 if (preventry && preventry->Generator()->ProvidesCollisionGeometry())
1ebe6dc8 206 {
7c54213e 207 gen->SetCollisionGeometry(preventry->Generator()->CollisionGeometry());
1ebe6dc8 208 } else {
7c54213e 209 Fatal("Generate()", "No Collision Geometry Provided");
210 }
211 }
212 //
213 // Number of signals is calculated from Collision Geometry
db051b0c 214 // and entry with given centrality bin is selected
7c54213e 215 //
216 if (entry->Formula() != 0)
217 {
218 if (!collentry) {
219 Fatal("Generate()", "No Collision Geometry Provided");
220 return;
221 }
222 AliCollisionGeometry* coll = (collentry->Generator())->CollisionGeometry();
223 Float_t b = coll->ImpactParameter();
224 Int_t nsig = Int_t(entry->Formula()->Eval(b));
db051b0c 225 Int_t bin = entry->Bin() - 100;
226 if (bin > 0) {
227 if (bin != nsig) continue;
228 } else {
229 if (nsig < 1) nsig = 1;
230 AliInfo(Form("Signal Events %13.3f %5d %5d\n", b, coll->HardScatters(), nsig));
231 ntimes = nsig;
232 }
a8408367 233 }
2b597689 234
db051b0c 235 gen->SetVertex(fVertex.At(0), fVertex.At(1), fVertex.At(2));
72cf8302 236
db051b0c 237 for (Int_t i = 0; i < ntimes; i++) gen->Generate();
7c54213e 238 entry->SetLast(partArray->GetEntriesFast());
239 preventry = entry;
240 }
c89fc3f1 241 } else if (fRandom) {
1ebe6dc8 242 //
243 // Select a generator randomly
244 //
245 Int_t i;
246 Float_t p0 = gRandom->Rndm();
247
248 for (i = 0; i < fNGenerators; i++) {
249 if (p0 < fProb[i]) break;
a8408367 250 }
1ebe6dc8 251
252 entry = (AliGenCocktailEntry*) fEntries->At(i);
253 entry->SetFirst(0);
254 gen = entry->Generator();
08bffa4d 255 gen->SetVertex(fVertex.At(0), fVertex.At(1), fVertex.At(2));
256 gen->Generate();
374924b5 257 entry->SetLast(partArray->GetEntriesFast());
c89fc3f1 258 }
1ebe6dc8 259
374924b5 260 next.Reset();
4f85aa78 261
67db3ff2 262// Event Vertex
4f85aa78 263 fHeader->SetPrimaryVertex(eventVertex);
bcee5fdf 264 fHeader->CalcNProduced();
4f85aa78 265 gAlice->SetGenEventHeader(fHeader);
374924b5 266}
fe4da5cc 267
c44d1c08 268void AliGenCocktail::SetVertexSmear(VertexSmear_t smear)
269{
270// Set vertex smearing and propagate it to the generators
271
272 AliGenerator::SetVertexSmear(smear);
273 TIter next(fEntries);
274 while (AliGenCocktailEntry* entry = (AliGenCocktailEntry*)next()) {
275 entry->Generator()->SetVertexSmear(smear);
276 }
277}
278
fe4da5cc 279AliGenCocktailEntry * AliGenCocktail::FirstGenerator()
280{
374924b5 281// Iterator over generators: Initialisation
fe4da5cc 282 flnk1 = fEntries->FirstLink();
283 if (flnk1) {
284 return (AliGenCocktailEntry*) (flnk1->GetObject());
285 } else {
286 return 0;
287 }
288}
289
290AliGenCocktailEntry* AliGenCocktail::NextGenerator()
291{
374924b5 292// Iterator over generators: Increment
fe4da5cc 293 flnk1 = flnk1->Next();
294 if (flnk1) {
295 return (AliGenCocktailEntry*) (flnk1->GetObject());
296 } else {
297 return 0;
298 }
299}
300
301void AliGenCocktail::
302FirstGeneratorPair(AliGenCocktailEntry*& e1, AliGenCocktailEntry*& e2)
303{
374924b5 304// Iterator over generator pairs: Initialisation
fe4da5cc 305 flnk2 = flnk1 = fEntries->FirstLink();
306 if (flnk1) {
307 e2 = e1 = (AliGenCocktailEntry*) (flnk1->GetObject());
308 } else {
309 e2= e1 = 0;
310 }
311}
312
313void AliGenCocktail::
314NextGeneratorPair(AliGenCocktailEntry*& e1, AliGenCocktailEntry*& e2)
315{
374924b5 316// Iterator over generators: Increment
fe4da5cc 317 flnk2 = flnk2->Next();
318 if (flnk2) {
319 e1 = (AliGenCocktailEntry*) (flnk1->GetObject());
320 e2 = (AliGenCocktailEntry*) (flnk2->GetObject());
321 } else {
322 flnk2 = flnk1 = flnk1->Next();
323 if (flnk1) {
324 e1 = (AliGenCocktailEntry*) (flnk1->GetObject());
325 e2 = (AliGenCocktailEntry*) (flnk2->GetObject());
326 } else {
327 e1=0;
328 e2=0;
329 }
330 }
331}
332
4f85aa78 333void AliGenCocktail::AddHeader(AliGenEventHeader* header)
334{
335// Add a header to the list
336 if (fHeader) fHeader->AddHeader(header);
337}
fe4da5cc 338
198bb1c7 339
340
fe4da5cc 341