Setter for calling Generate n-times
[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
83cb58d0 46using std::cout;
47using std::endl;
198bb1c7 48ClassImp(AliGenExtFile)
380956c5 49
50AliGenExtFile::AliGenExtFile()
1c56e311 51 :AliGenMC(),
52 fFileName(0),
9d188d33 53 fReader(0),
54 fStartEvent(0)
693caace 55{
f87cfe57 56// Constructor
693caace 57//
58// Read all particles
e1b35da7 59 fNpart = -1;
693caace 60}
61
62AliGenExtFile::AliGenExtFile(Int_t npart)
1c56e311 63 :AliGenMC(npart),
64 fFileName(0),
9d188d33 65 fReader(0),
66 fStartEvent(0)
693caace 67{
f87cfe57 68// Constructor
a48e3376 69 fName = "ExtFile";
70 fTitle = "Primaries from ext. File";
693caace 71}
72
73//____________________________________________________________
74AliGenExtFile::~AliGenExtFile()
75{
f87cfe57 76// Destructor
a48e3376 77 delete fReader;
693caace 78}
79
a48e3376 80//___________________________________________________________
81void AliGenExtFile::Init()
693caace 82{
a48e3376 83// Initialize
84 if (fReader) fReader->Init();
693caace 85}
86
9d188d33 87//___________________________________________________________
693caace 88void AliGenExtFile::Generate()
89{
f87cfe57 90// Generate particles
693caace 91
eed0bb9a 92 Double_t polar[3] = {0,0,0};
693caace 93 //
eed0bb9a 94 Double_t origin[3] = {0,0,0};
21391258 95 Double_t time = 0.;
1628e931 96 Double_t p[4];
693caace 97 Float_t random[6];
88cb7938 98 Int_t i = 0, j, nt;
693caace 99 //
4f23c932 100 //
101 if (fVertexSmear == kPerEvent) Vertex();
693caace 102
9d188d33 103 // Fast forward up to start Event
104 for (Int_t ie=0; ie<fStartEvent; ++ie ) {
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 TParticle* iparticle = 0x0;
112 while ((iparticle=fReader->NextParticle()) ) ;
113 cout << "Skipping event " << ie << endl;
114 }
115
380956c5 116 while(1) {
117 Int_t nTracks = fReader->NextEvent();
118 if (nTracks == 0) {
119 // printf("\n No more events !!! !\n");
120 Warning("AliGenExtFile::Generate","\nNo more events in external file!!!\nLast event may be empty or incomplete.\n");
693caace 121 return;
380956c5 122 }
123
124 //
125 // Particle selection loop
126 //
4f23c932 127 // The selection criterium for the external file generator is as follows:
380956c5 128 //
4f23c932 129 // 1) All tracks are subject to the cuts defined by AliGenerator, i.e.
380956c5 130 // fThetaMin, fThetaMax, fPhiMin, fPhiMax, fPMin, fPMax, fPtMin, fPtMax,
131 // fYMin, fYMax.
132 // If the particle does not satisfy these cuts, it is not put on the
133 // stack.
134 // 2) If fCutOnChild and some specific child is selected (e.g. if
135 // fForceDecay==kSemiElectronic) the event is rejected if NOT EVEN ONE
136 // child falls into the child-cuts.
88cb7938 137 TParticle* iparticle = 0x0;
138
380956c5 139 if(fCutOnChild) {
140 // Count the selected children
141 Int_t nSelected = 0;
4f23c932 142 while ((iparticle=fReader->NextParticle()) ) {
143 Int_t kf = CheckPDGCode(iparticle->GetPdgCode());
144 kf = TMath::Abs(kf);
145 if (ChildSelected(kf) && KinematicSelection(iparticle, 1)) {
146 nSelected++;
147 }
380956c5 148 }
149 if (!nSelected) continue; // No particle selected: Go to next event
150 fReader->RewindEvent();
151 }
a48e3376 152
380956c5 153 //
154 // Stack filling loop
155 //
7cf36cae 156 fNprimaries = 0;
380956c5 157 for (i = 0; i < nTracks; i++) {
ea79897e 158 TParticle* jparticle = fReader->NextParticle();
159 Bool_t selected = KinematicSelection(jparticle,0);
4f23c932 160 if (!selected) continue;
ea79897e 161 p[0] = jparticle->Px();
162 p[1] = jparticle->Py();
163 p[2] = jparticle->Pz();
1628e931 164 p[3] = jparticle->Energy();
165
b7a824ae 166 Int_t idpart = jparticle->GetPdgCode();
4f23c932 167 if(fVertexSmear==kPerTrack)
168 {
169 Rndm(random,6);
170 for (j = 0; j < 3; j++) {
171 origin[j]=fOrigin[j]+
172 fOsigma[j]*TMath::Cos(2*random[2*j]*TMath::Pi())*
173 TMath::Sqrt(-2*TMath::Log(random[2*j+1]));
174 }
21391258 175 Rndm(random,2);
176 time = fTimeOrigin + fOsigma[2]/TMath::Ccgs()*
177 TMath::Cos(2*random[0]*TMath::Pi())*
178 TMath::Sqrt(-2*TMath::Log(random[1]));
380956c5 179 } else {
ea79897e 180 origin[0] = fVertex[0] + jparticle->Vx();
181 origin[1] = fVertex[1] + jparticle->Vy();
182 origin[2] = fVertex[2] + jparticle->Vz();
21391258 183 time = fTime + jparticle->T();
380956c5 184 }
8f126362 185 Int_t doTracking = fTrackIt && selected && (jparticle->TestBit(kTransportBit));
ea79897e 186 Int_t parent = jparticle->GetFirstMother();
4f23c932 187
eed0bb9a 188 PushTrack(doTracking, parent, idpart,
21391258 189 p[0], p[1], p[2], p[3], origin[0], origin[1], origin[2], time,
eed0bb9a 190 polar[0], polar[1], polar[2],
191 kPPrimary, nt, 1., jparticle->GetStatusCode());
192
4f23c932 193 KeepTrack(nt);
7cf36cae 194 fNprimaries++;
380956c5 195 } // track loop
0b05fbf9 196
197 // Generated event header
4f23c932 198
0b05fbf9 199 AliGenEventHeader * header = new AliGenEventHeader();
7cf36cae 200 header->SetNProduced(fNprimaries);
0b05fbf9 201 header->SetPrimaryVertex(fVertex);
21391258 202 header->SetInteractionTime(fTime);
7cf36cae 203 AddHeader(header);
380956c5 204 break;
4f23c932 205
380956c5 206 } // event loop
4f23c932 207
380956c5 208 SetHighWaterMark(nt);
2c354237 209 CdEventFile();
210}
380956c5 211
9d188d33 212//___________________________________________________________
2c354237 213void AliGenExtFile::CdEventFile()
214{
215// CD back to the event file
33c3c91a 216 AliRunLoader::Instance()->CdGAFile();
693caace 217}
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693caace 220
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