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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 | ||
16 | /* $Id$ */ | |
17 | ||
18 | // Event generator that using an instance of type AliGenReader | |
19 | // reads particles from a file and applies cuts. | |
20 | // Example: In your Config.C you can include the following lines | |
21 | // AliGenExtFile *gener = new AliGenExtFile(-1); | |
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 | ||
31 | ||
32 | #include <Riostream.h> | |
33 | ||
34 | #include "AliGenExtFile.h" | |
35 | #include "AliRun.h" | |
36 | ||
37 | #include <TParticle.h> | |
38 | #include <TFile.h> | |
39 | #include <TTree.h> | |
40 | ||
41 | ||
42 | ClassImp(AliGenExtFile) | |
43 | ||
44 | AliGenExtFile::AliGenExtFile() | |
45 | :AliGenMC() | |
46 | { | |
47 | // Constructor | |
48 | // | |
49 | // Read all particles | |
50 | fNpart =- 1; | |
51 | fReader = 0; | |
52 | } | |
53 | ||
54 | AliGenExtFile::AliGenExtFile(Int_t npart) | |
55 | :AliGenMC(npart) | |
56 | { | |
57 | // Constructor | |
58 | fName = "ExtFile"; | |
59 | fTitle = "Primaries from ext. File"; | |
60 | fReader = 0; | |
61 | } | |
62 | ||
63 | AliGenExtFile::AliGenExtFile(const AliGenExtFile & ExtFile): | |
64 | AliGenMC(ExtFile) | |
65 | { | |
66 | // Copy constructor | |
67 | ExtFile.Copy(*this); | |
68 | } | |
69 | //____________________________________________________________ | |
70 | AliGenExtFile::~AliGenExtFile() | |
71 | { | |
72 | // Destructor | |
73 | delete fReader; | |
74 | } | |
75 | ||
76 | //___________________________________________________________ | |
77 | void AliGenExtFile::Init() | |
78 | { | |
79 | // Initialize | |
80 | if (fReader) fReader->Init(); | |
81 | } | |
82 | ||
83 | ||
84 | void AliGenExtFile::Generate() | |
85 | { | |
86 | // Generate particles | |
87 | ||
88 | Float_t polar[3] = {0,0,0}; | |
89 | // | |
90 | Float_t origin[3] = {0,0,0}; | |
91 | Float_t p[3]; | |
92 | Float_t random[6]; | |
93 | Int_t i = 0, j, nt; | |
94 | // | |
95 | for (j=0;j<3;j++) origin[j]=fOrigin[j]; | |
96 | if(fVertexSmear == kPerTrack) { | |
97 | Rndm(random,6); | |
98 | for (j = 0; j < 3; j++) { | |
99 | origin[j] += fOsigma[j]*TMath::Cos(2*random[2*j]*TMath::Pi())* | |
100 | TMath::Sqrt(-2*TMath::Log(random[2*j+1])); | |
101 | } | |
102 | } | |
103 | ||
104 | while(1) { | |
105 | Int_t nTracks = fReader->NextEvent(); | |
106 | if (nTracks == 0) { | |
107 | // printf("\n No more events !!! !\n"); | |
108 | Warning("AliGenExtFile::Generate","\nNo more events in external file!!!\nLast event may be empty or incomplete.\n"); | |
109 | return; | |
110 | } | |
111 | ||
112 | // | |
113 | // Particle selection loop | |
114 | // | |
115 | // The selction criterium for the external file generator is as follows: | |
116 | // | |
117 | // 1) All tracks are subjects to the cuts defined by AliGenerator, i.e. | |
118 | // fThetaMin, fThetaMax, fPhiMin, fPhiMax, fPMin, fPMax, fPtMin, fPtMax, | |
119 | // fYMin, fYMax. | |
120 | // If the particle does not satisfy these cuts, it is not put on the | |
121 | // stack. | |
122 | // 2) If fCutOnChild and some specific child is selected (e.g. if | |
123 | // fForceDecay==kSemiElectronic) the event is rejected if NOT EVEN ONE | |
124 | // child falls into the child-cuts. | |
125 | TParticle* iparticle = 0x0; | |
126 | ||
127 | if(fCutOnChild) { | |
128 | // Count the selected children | |
129 | Int_t nSelected = 0; | |
130 | while ( (iparticle=fReader->NextParticle()) ) { | |
131 | ; | |
132 | Int_t kf = CheckPDGCode(iparticle->GetPdgCode()); | |
133 | kf = TMath::Abs(kf); | |
134 | if (ChildSelected(kf) && KinematicSelection(iparticle, 1)) { | |
135 | nSelected++; | |
136 | } | |
137 | } | |
138 | if (!nSelected) continue; // No particle selected: Go to next event | |
139 | fReader->RewindEvent(); | |
140 | } | |
141 | ||
142 | // | |
143 | // Stack filling loop | |
144 | // | |
145 | for (i = 0; i < nTracks; i++) { | |
146 | ||
147 | TParticle* iparticle = fReader->NextParticle(); | |
148 | Bool_t selected = KinematicSelection(iparticle,0); | |
149 | if (!selected) { | |
150 | Double_t pz = iparticle->Pz(); | |
151 | Double_t e = iparticle->Energy(); | |
152 | Double_t y; | |
153 | if ((e-pz) == 0) { | |
154 | y = 20.; | |
155 | } else if ((e+pz) == 0.) { | |
156 | y = -20.; | |
157 | } else { | |
158 | y = 0.5*TMath::Log((e+pz)/(e-pz)); | |
159 | } | |
160 | printf("\n Not selected %d %f %f %f %f %f", i, | |
161 | iparticle->Theta(), | |
162 | iparticle->Phi(), | |
163 | iparticle->P(), | |
164 | iparticle->Pt(), | |
165 | y); | |
166 | //PH delete iparticle; | |
167 | // continue; | |
168 | } | |
169 | p[0] = iparticle->Px(); | |
170 | p[1] = iparticle->Py(); | |
171 | p[2] = iparticle->Pz(); | |
172 | Int_t idpart = iparticle->GetPdgCode(); | |
173 | if(fVertexSmear==kPerTrack) | |
174 | { | |
175 | Rndm(random,6); | |
176 | for (j = 0; j < 3; j++) { | |
177 | origin[j]=fOrigin[j]+ | |
178 | fOsigma[j]*TMath::Cos(2*random[2*j]*TMath::Pi())* | |
179 | TMath::Sqrt(-2*TMath::Log(random[2*j+1])); | |
180 | } | |
181 | } | |
182 | Int_t decayed = iparticle->GetFirstDaughter(); | |
183 | Int_t doTracking = fTrackIt && (decayed < 0) && | |
184 | (TMath::Abs(idpart) > 10) && selected; | |
185 | // printf("*** pdg, first daughter, trk = %d, %d, %d\n", | |
186 | // idpart,decayed, doTracking); | |
187 | //PH PushTrack(doTracking,-1,idpart,p,origin,polar,0,kPPrimary,nt); | |
188 | Int_t parent = iparticle->GetFirstMother(); | |
189 | PushTrack(doTracking,parent,idpart,p,origin,polar,0,kPPrimary,nt); | |
190 | KeepTrack(nt); | |
191 | } // track loop | |
192 | ||
193 | break; | |
194 | ||
195 | } // event loop | |
196 | ||
197 | SetHighWaterMark(nt); | |
198 | CdEventFile(); | |
199 | } | |
200 | ||
201 | void AliGenExtFile::CdEventFile() | |
202 | { | |
203 | // CD back to the event file | |
204 | TFile *pFile=0; | |
205 | if (!gAlice) { | |
206 | gAlice = (AliRun*)pFile->Get("gAlice"); | |
207 | if (gAlice) printf("AliRun object found on file\n"); | |
208 | if (!gAlice) gAlice = new AliRun("gAlice","Alice test program"); | |
209 | } | |
210 | TTree *fAli=gAlice->TreeK(); | |
211 | if (fAli) pFile =fAli->GetCurrentFile(); | |
212 | pFile->cd(); | |
213 | } | |
214 | ||
215 | ||
216 | AliGenExtFile& AliGenExtFile::operator=(const AliGenExtFile& rhs) | |
217 | { | |
218 | // Assignment operator | |
219 | rhs.Copy(*this); | |
220 | return *this; | |
221 | } | |
222 | ||
223 | ||
224 | void AliGenExtFile::Copy(TObject&) const | |
225 | { | |
226 | // | |
227 | // Copy | |
228 | // | |
229 | Fatal("Copy","Not implemented!\n"); | |
230 | } | |
231 | ||
232 | ||
233 | ||
234 | ||
235 | ||
236 | ||
237 |