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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 "AliStack.h" | |
38 | #include "AliGenEventHeader.h" | |
39 | #include "AliGenReader.h" | |
40 | ||
41 | #include <TParticle.h> | |
42 | #include <TFile.h> | |
43 | #include <TTree.h> | |
44 | ||
45 | ||
46 | ClassImp(AliGenExtFile) | |
47 | ||
48 | AliGenExtFile::AliGenExtFile() | |
49 | :AliGenMC(), | |
50 | fFileName(0), | |
51 | fReader(0) | |
52 | { | |
53 | // Constructor | |
54 | // | |
55 | // Read all particles | |
56 | fNpart =- 1; | |
57 | } | |
58 | ||
59 | AliGenExtFile::AliGenExtFile(Int_t npart) | |
60 | :AliGenMC(npart), | |
61 | fFileName(0), | |
62 | fReader(0) | |
63 | { | |
64 | // Constructor | |
65 | fName = "ExtFile"; | |
66 | fTitle = "Primaries from ext. File"; | |
67 | } | |
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 | Double_t polar[3] = {0,0,0}; | |
89 | // | |
90 | Double_t origin[3] = {0,0,0}; | |
91 | Double_t p[4]; | |
92 | Float_t random[6]; | |
93 | Int_t i = 0, j, nt; | |
94 | // | |
95 | // | |
96 | if (fVertexSmear == kPerEvent) Vertex(); | |
97 | ||
98 | while(1) { | |
99 | Int_t nTracks = fReader->NextEvent(); | |
100 | if (nTracks == 0) { | |
101 | // printf("\n No more events !!! !\n"); | |
102 | Warning("AliGenExtFile::Generate","\nNo more events in external file!!!\nLast event may be empty or incomplete.\n"); | |
103 | return; | |
104 | } | |
105 | ||
106 | // | |
107 | // Particle selection loop | |
108 | // | |
109 | // The selection criterium for the external file generator is as follows: | |
110 | // | |
111 | // 1) All tracks are subject to the cuts defined by AliGenerator, i.e. | |
112 | // fThetaMin, fThetaMax, fPhiMin, fPhiMax, fPMin, fPMax, fPtMin, fPtMax, | |
113 | // fYMin, fYMax. | |
114 | // If the particle does not satisfy these cuts, it is not put on the | |
115 | // stack. | |
116 | // 2) If fCutOnChild and some specific child is selected (e.g. if | |
117 | // fForceDecay==kSemiElectronic) the event is rejected if NOT EVEN ONE | |
118 | // child falls into the child-cuts. | |
119 | TParticle* iparticle = 0x0; | |
120 | ||
121 | if(fCutOnChild) { | |
122 | // Count the selected children | |
123 | Int_t nSelected = 0; | |
124 | while ((iparticle=fReader->NextParticle()) ) { | |
125 | Int_t kf = CheckPDGCode(iparticle->GetPdgCode()); | |
126 | kf = TMath::Abs(kf); | |
127 | if (ChildSelected(kf) && KinematicSelection(iparticle, 1)) { | |
128 | nSelected++; | |
129 | } | |
130 | } | |
131 | if (!nSelected) continue; // No particle selected: Go to next event | |
132 | fReader->RewindEvent(); | |
133 | } | |
134 | ||
135 | // | |
136 | // Stack filling loop | |
137 | // | |
138 | fNprimaries = 0; | |
139 | for (i = 0; i < nTracks; i++) { | |
140 | TParticle* jparticle = fReader->NextParticle(); | |
141 | Bool_t selected = KinematicSelection(jparticle,0); | |
142 | if (!selected) continue; | |
143 | p[0] = jparticle->Px(); | |
144 | p[1] = jparticle->Py(); | |
145 | p[2] = jparticle->Pz(); | |
146 | p[3] = jparticle->Energy(); | |
147 | ||
148 | Int_t idpart = jparticle->GetPdgCode(); | |
149 | if(fVertexSmear==kPerTrack) | |
150 | { | |
151 | Rndm(random,6); | |
152 | for (j = 0; j < 3; j++) { | |
153 | origin[j]=fOrigin[j]+ | |
154 | fOsigma[j]*TMath::Cos(2*random[2*j]*TMath::Pi())* | |
155 | TMath::Sqrt(-2*TMath::Log(random[2*j+1])); | |
156 | } | |
157 | } else { | |
158 | origin[0] = fVertex[0] + jparticle->Vx(); | |
159 | origin[1] = fVertex[1] + jparticle->Vy(); | |
160 | origin[2] = fVertex[2] + jparticle->Vz(); | |
161 | } | |
162 | Double_t tof = jparticle->T(); | |
163 | Int_t doTracking = fTrackIt && selected && (jparticle->TestBit(kTransportBit)); | |
164 | Int_t parent = jparticle->GetFirstMother(); | |
165 | ||
166 | PushTrack(doTracking, parent, idpart, | |
167 | p[0], p[1], p[2], p[3], origin[0], origin[1], origin[2], tof, | |
168 | polar[0], polar[1], polar[2], | |
169 | kPPrimary, nt, 1., jparticle->GetStatusCode()); | |
170 | ||
171 | KeepTrack(nt); | |
172 | fNprimaries++; | |
173 | } // track loop | |
174 | ||
175 | // Generated event header | |
176 | ||
177 | AliGenEventHeader * header = new AliGenEventHeader(); | |
178 | header->SetNProduced(fNprimaries); | |
179 | header->SetPrimaryVertex(fVertex); | |
180 | AddHeader(header); | |
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::Instance()->CdGAFile(); | |
193 | } | |
194 | ||
195 | ||
196 | ||
197 | ||
198 |