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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 "AliRunLoader.h" | |
36 | #include "AliHeader.h" | |
37 | #include "AliGenEventHeader.h" | |
38 | ||
39 | #include <TParticle.h> | |
40 | #include <TFile.h> | |
41 | #include <TTree.h> | |
42 | ||
43 | ||
44 | ClassImp(AliGenExtFile) | |
45 | ||
46 | AliGenExtFile::AliGenExtFile() | |
47 | :AliGenMC(), | |
48 | fFileName(0), | |
49 | fReader(0) | |
50 | { | |
51 | // Constructor | |
52 | // | |
53 | // Read all particles | |
54 | fNpart =- 1; | |
55 | } | |
56 | ||
57 | AliGenExtFile::AliGenExtFile(Int_t npart) | |
58 | :AliGenMC(npart), | |
59 | fFileName(0), | |
60 | fReader(0) | |
61 | { | |
62 | // Constructor | |
63 | fName = "ExtFile"; | |
64 | fTitle = "Primaries from ext. File"; | |
65 | } | |
66 | ||
67 | AliGenExtFile::AliGenExtFile(const AliGenExtFile & ExtFile): | |
68 | AliGenMC(ExtFile), | |
69 | fFileName(0), | |
70 | fReader(0) | |
71 | { | |
72 | // Copy constructor | |
73 | ExtFile.Copy(*this); | |
74 | } | |
75 | //____________________________________________________________ | |
76 | AliGenExtFile::~AliGenExtFile() | |
77 | { | |
78 | // Destructor | |
79 | delete fReader; | |
80 | } | |
81 | ||
82 | //___________________________________________________________ | |
83 | void AliGenExtFile::Init() | |
84 | { | |
85 | // Initialize | |
86 | if (fReader) fReader->Init(); | |
87 | } | |
88 | ||
89 | ||
90 | void AliGenExtFile::Generate() | |
91 | { | |
92 | // Generate particles | |
93 | ||
94 | Float_t polar[3] = {0,0,0}; | |
95 | // | |
96 | Float_t origin[3] = {0,0,0}; | |
97 | Float_t p[3]; | |
98 | Float_t random[6]; | |
99 | Int_t i = 0, j, nt; | |
100 | // | |
101 | // | |
102 | if (fVertexSmear == kPerEvent) Vertex(); | |
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 selection criterium for the external file generator is as follows: | |
116 | // | |
117 | // 1) All tracks are subject 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 | Int_t kf = CheckPDGCode(iparticle->GetPdgCode()); | |
132 | kf = TMath::Abs(kf); | |
133 | if (ChildSelected(kf) && KinematicSelection(iparticle, 1)) { | |
134 | nSelected++; | |
135 | } | |
136 | } | |
137 | if (!nSelected) continue; // No particle selected: Go to next event | |
138 | fReader->RewindEvent(); | |
139 | } | |
140 | ||
141 | // | |
142 | // Stack filling loop | |
143 | // | |
144 | for (i = 0; i < nTracks; i++) { | |
145 | TParticle* iparticle = fReader->NextParticle(); | |
146 | Bool_t selected = KinematicSelection(iparticle,0); | |
147 | if (!selected) continue; | |
148 | p[0] = iparticle->Px(); | |
149 | p[1] = iparticle->Py(); | |
150 | p[2] = iparticle->Pz(); | |
151 | Int_t idpart = iparticle->GetPdgCode(); | |
152 | if(fVertexSmear==kPerTrack) | |
153 | { | |
154 | Rndm(random,6); | |
155 | for (j = 0; j < 3; j++) { | |
156 | origin[j]=fOrigin[j]+ | |
157 | fOsigma[j]*TMath::Cos(2*random[2*j]*TMath::Pi())* | |
158 | TMath::Sqrt(-2*TMath::Log(random[2*j+1])); | |
159 | } | |
160 | } else { | |
161 | origin[0] = fVertex[0] + iparticle->Vx(); | |
162 | origin[1] = fVertex[1] + iparticle->Vy(); | |
163 | origin[2] = fVertex[2] + iparticle->Vz(); | |
164 | } | |
165 | ||
166 | Int_t decayed = iparticle->GetFirstDaughter(); | |
167 | Int_t doTracking = fTrackIt && (decayed < 0) && (TMath::Abs(idpart) > 10) && selected; | |
168 | Int_t parent = iparticle->GetFirstMother(); | |
169 | ||
170 | PushTrack(doTracking,parent,idpart,p,origin,polar,0,kPPrimary,nt); | |
171 | KeepTrack(nt); | |
172 | } // track loop | |
173 | ||
174 | // Generated event header | |
175 | ||
176 | AliGenEventHeader * header = new AliGenEventHeader(); | |
177 | header->SetNProduced(nt+1); | |
178 | header->SetPrimaryVertex(fVertex); | |
179 | AliRunLoader::GetRunLoader()->GetHeader()->SetGenEventHeader(header); | |
180 | ||
181 | break; | |
182 | ||
183 | } // event loop | |
184 | ||
185 | SetHighWaterMark(nt); | |
186 | CdEventFile(); | |
187 | } | |
188 | ||
189 | void AliGenExtFile::CdEventFile() | |
190 | { | |
191 | // CD back to the event file | |
192 | (AliRunLoader::GetRunLoader())->CdGAFile(); | |
193 | } | |
194 | ||
195 | ||
196 | AliGenExtFile& AliGenExtFile::operator=(const AliGenExtFile& rhs) | |
197 | { | |
198 | // Assignment operator | |
199 | rhs.Copy(*this); | |
200 | return *this; | |
201 | } | |
202 | ||
203 | ||
204 | void AliGenExtFile::Copy(TObject&) const | |
205 | { | |
206 | // | |
207 | // Copy | |
208 | // | |
209 | Fatal("Copy","Not implemented!\n"); | |
210 | } | |
211 | ||
212 | ||
213 | ||
214 | ||
215 | ||
216 | ||
217 |