Modifications in AliRoot for re-processing a selected event.
[u/mrichter/AliRoot.git] / EVGEN / AliGenExtFile.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
25454878 16/* $Id$ */
675e9664 17
a48e3376 18// Event generator that using an instance of type AliGenReader
25454878 19// reads particles from a file and applies cuts.
20// Example: In your Config.C you can include the following lines
4f23c932 21// AliGenExtFile *gener = new AliGenExtFile(-1);
25454878 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
675e9664 31
159ec319 32#include <Riostream.h>
084c1b4a 33
693caace 34#include "AliGenExtFile.h"
4f23c932 35#include "AliRunLoader.h"
9ad9d6f5 36#include "AliHeader.h"
aa4e331d 37#include "AliStack.h"
9ad9d6f5 38#include "AliGenEventHeader.h"
4a33c50d 39#include "AliGenReader.h"
5c3fd7ea 40
a48e3376 41#include <TParticle.h>
693caace 42#include <TFile.h>
a48e3376 43#include <TTree.h>
44
5c3fd7ea 45
198bb1c7 46ClassImp(AliGenExtFile)
380956c5 47
48AliGenExtFile::AliGenExtFile()
1c56e311 49 :AliGenMC(),
50 fFileName(0),
9d188d33 51 fReader(0),
52 fStartEvent(0)
693caace 53{
f87cfe57 54// Constructor
693caace 55//
56// Read all particles
e1b35da7 57 fNpart = -1;
693caace 58}
59
60AliGenExtFile::AliGenExtFile(Int_t npart)
1c56e311 61 :AliGenMC(npart),
62 fFileName(0),
9d188d33 63 fReader(0),
64 fStartEvent(0)
693caace 65{
f87cfe57 66// Constructor
a48e3376 67 fName = "ExtFile";
68 fTitle = "Primaries from ext. File";
693caace 69}
70
71//____________________________________________________________
72AliGenExtFile::~AliGenExtFile()
73{
f87cfe57 74// Destructor
a48e3376 75 delete fReader;
693caace 76}
77
a48e3376 78//___________________________________________________________
79void AliGenExtFile::Init()
693caace 80{
a48e3376 81// Initialize
82 if (fReader) fReader->Init();
693caace 83}
84
9d188d33 85//___________________________________________________________
693caace 86void AliGenExtFile::Generate()
87{
f87cfe57 88// Generate particles
693caace 89
eed0bb9a 90 Double_t polar[3] = {0,0,0};
693caace 91 //
eed0bb9a 92 Double_t origin[3] = {0,0,0};
21391258 93 Double_t time = 0.;
1628e931 94 Double_t p[4];
693caace 95 Float_t random[6];
88cb7938 96 Int_t i = 0, j, nt;
693caace 97 //
4f23c932 98 //
99 if (fVertexSmear == kPerEvent) Vertex();
693caace 100
9d188d33 101 // Fast forward up to start Event
102 for (Int_t ie=0; ie<fStartEvent; ++ie ) {
103 Int_t nTracks = fReader->NextEvent();
104 if (nTracks == 0) {
105 // printf("\n No more events !!! !\n");
106 Warning("AliGenExtFile::Generate","\nNo more events in external file!!!\nLast event may be empty or incomplete.\n");
107 return;
108 }
109 TParticle* iparticle = 0x0;
110 while ((iparticle=fReader->NextParticle()) ) ;
111 cout << "Skipping event " << ie << endl;
112 }
113
380956c5 114 while(1) {
115 Int_t nTracks = fReader->NextEvent();
116 if (nTracks == 0) {
117 // printf("\n No more events !!! !\n");
118 Warning("AliGenExtFile::Generate","\nNo more events in external file!!!\nLast event may be empty or incomplete.\n");
693caace 119 return;
380956c5 120 }
121
122 //
123 // Particle selection loop
124 //
4f23c932 125 // The selection criterium for the external file generator is as follows:
380956c5 126 //
4f23c932 127 // 1) All tracks are subject to the cuts defined by AliGenerator, i.e.
380956c5 128 // fThetaMin, fThetaMax, fPhiMin, fPhiMax, fPMin, fPMax, fPtMin, fPtMax,
129 // fYMin, fYMax.
130 // If the particle does not satisfy these cuts, it is not put on the
131 // stack.
132 // 2) If fCutOnChild and some specific child is selected (e.g. if
133 // fForceDecay==kSemiElectronic) the event is rejected if NOT EVEN ONE
134 // child falls into the child-cuts.
88cb7938 135 TParticle* iparticle = 0x0;
136
380956c5 137 if(fCutOnChild) {
138 // Count the selected children
139 Int_t nSelected = 0;
4f23c932 140 while ((iparticle=fReader->NextParticle()) ) {
141 Int_t kf = CheckPDGCode(iparticle->GetPdgCode());
142 kf = TMath::Abs(kf);
143 if (ChildSelected(kf) && KinematicSelection(iparticle, 1)) {
144 nSelected++;
145 }
380956c5 146 }
147 if (!nSelected) continue; // No particle selected: Go to next event
148 fReader->RewindEvent();
149 }
a48e3376 150
380956c5 151 //
152 // Stack filling loop
153 //
7cf36cae 154 fNprimaries = 0;
380956c5 155 for (i = 0; i < nTracks; i++) {
ea79897e 156 TParticle* jparticle = fReader->NextParticle();
157 Bool_t selected = KinematicSelection(jparticle,0);
4f23c932 158 if (!selected) continue;
ea79897e 159 p[0] = jparticle->Px();
160 p[1] = jparticle->Py();
161 p[2] = jparticle->Pz();
1628e931 162 p[3] = jparticle->Energy();
163
b7a824ae 164 Int_t idpart = jparticle->GetPdgCode();
4f23c932 165 if(fVertexSmear==kPerTrack)
166 {
167 Rndm(random,6);
168 for (j = 0; j < 3; j++) {
169 origin[j]=fOrigin[j]+
170 fOsigma[j]*TMath::Cos(2*random[2*j]*TMath::Pi())*
171 TMath::Sqrt(-2*TMath::Log(random[2*j+1]));
172 }
21391258 173 Rndm(random,2);
174 time = fTimeOrigin + fOsigma[2]/TMath::Ccgs()*
175 TMath::Cos(2*random[0]*TMath::Pi())*
176 TMath::Sqrt(-2*TMath::Log(random[1]));
380956c5 177 } else {
ea79897e 178 origin[0] = fVertex[0] + jparticle->Vx();
179 origin[1] = fVertex[1] + jparticle->Vy();
180 origin[2] = fVertex[2] + jparticle->Vz();
21391258 181 time = fTime + jparticle->T();
380956c5 182 }
8f126362 183 Int_t doTracking = fTrackIt && selected && (jparticle->TestBit(kTransportBit));
ea79897e 184 Int_t parent = jparticle->GetFirstMother();
4f23c932 185
eed0bb9a 186 PushTrack(doTracking, parent, idpart,
21391258 187 p[0], p[1], p[2], p[3], origin[0], origin[1], origin[2], time,
eed0bb9a 188 polar[0], polar[1], polar[2],
189 kPPrimary, nt, 1., jparticle->GetStatusCode());
190
4f23c932 191 KeepTrack(nt);
7cf36cae 192 fNprimaries++;
380956c5 193 } // track loop
0b05fbf9 194
195 // Generated event header
4f23c932 196
0b05fbf9 197 AliGenEventHeader * header = new AliGenEventHeader();
7cf36cae 198 header->SetNProduced(fNprimaries);
0b05fbf9 199 header->SetPrimaryVertex(fVertex);
21391258 200 header->SetInteractionTime(fTime);
7cf36cae 201 AddHeader(header);
380956c5 202 break;
4f23c932 203
380956c5 204 } // event loop
4f23c932 205
380956c5 206 SetHighWaterMark(nt);
2c354237 207 CdEventFile();
208}
380956c5 209
9d188d33 210//___________________________________________________________
2c354237 211void AliGenExtFile::CdEventFile()
212{
213// CD back to the event file
33c3c91a 214 AliRunLoader::Instance()->CdGAFile();
693caace 215}
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