Store all the particles in the stack, but track only the selected ones
[u/mrichter/AliRoot.git] / EVGEN / AliGenExtFile.cxx
CommitLineData
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
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
675e9664 31
159ec319 32#include <Riostream.h>
084c1b4a 33
693caace 34#include "AliGenExtFile.h"
693caace 35#include "AliRun.h"
5c3fd7ea 36
a48e3376 37#include <TParticle.h>
693caace 38#include <TFile.h>
a48e3376 39#include <TTree.h>
40
5c3fd7ea 41
693caace 42 ClassImp(AliGenExtFile)
380956c5 43
44AliGenExtFile::AliGenExtFile()
45 :AliGenMC()
693caace 46{
f87cfe57 47// Constructor
693caace 48//
49// Read all particles
a48e3376 50 fNpart =- 1;
51 fReader = 0;
693caace 52}
53
54AliGenExtFile::AliGenExtFile(Int_t npart)
380956c5 55 :AliGenMC(npart)
693caace 56{
f87cfe57 57// Constructor
a48e3376 58 fName = "ExtFile";
59 fTitle = "Primaries from ext. File";
60 fReader = 0;
693caace 61}
62
f87cfe57 63AliGenExtFile::AliGenExtFile(const AliGenExtFile & ExtFile)
64{
65// copy constructor
66}
693caace 67//____________________________________________________________
68AliGenExtFile::~AliGenExtFile()
69{
f87cfe57 70// Destructor
a48e3376 71 delete fReader;
693caace 72}
73
a48e3376 74//___________________________________________________________
75void AliGenExtFile::Init()
693caace 76{
a48e3376 77// Initialize
78 if (fReader) fReader->Init();
693caace 79}
80
a48e3376 81
693caace 82void AliGenExtFile::Generate()
83{
f87cfe57 84// Generate particles
693caace 85
a48e3376 86 Float_t polar[3] = {0,0,0};
693caace 87 //
a48e3376 88 Float_t origin[3] = {0,0,0};
693caace 89 Float_t p[3];
90 Float_t random[6];
a48e3376 91 Int_t i, j, nt;
693caace 92 //
693caace 93 for (j=0;j<3;j++) origin[j]=fOrigin[j];
a48e3376 94 if(fVertexSmear == kPerTrack) {
65fb704d 95 Rndm(random,6);
a48e3376 96 for (j = 0; j < 3; j++) {
97 origin[j] += fOsigma[j]*TMath::Cos(2*random[2*j]*TMath::Pi())*
693caace 98 TMath::Sqrt(-2*TMath::Log(random[2*j+1]));
99 }
100 }
101
380956c5 102 while(1) {
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");
693caace 107 return;
380956c5 108 }
109
110 //
111 // Particle selection loop
112 //
113 // The selction criterium for the external file generator is as follows:
114 //
115 // 1) All tracs are subjects to the cuts defined by AliGenerator, i.e.
116 // fThetaMin, fThetaMax, fPhiMin, fPhiMax, fPMin, fPMax, fPtMin, fPtMax,
117 // fYMin, fYMax.
118 // If the particle does not satisfy these cuts, it is not put on the
119 // stack.
120 // 2) If fCutOnChild and some specific child is selected (e.g. if
121 // fForceDecay==kSemiElectronic) the event is rejected if NOT EVEN ONE
122 // child falls into the child-cuts.
123 if(fCutOnChild) {
124 // Count the selected children
125 Int_t nSelected = 0;
126
127 for (i = 0; i < nTracks; i++) {
128 TParticle* iparticle = fReader->NextParticle();
129 Int_t kf = CheckPDGCode(iparticle->GetPdgCode());
130 kf = TMath::Abs(kf);
131 if (ChildSelected(kf) && KinematicSelection(iparticle, 1)) {
132 nSelected++;
133 }
134 }
135 if (!nSelected) continue; // No particle selected: Go to next event
136 fReader->RewindEvent();
137 }
a48e3376 138
380956c5 139 //
140 // Stack filling loop
141 //
142 for (i = 0; i < nTracks; i++) {
14412d0b 143
a48e3376 144 TParticle* iparticle = fReader->NextParticle();
7b8b3898 145 Bool_t selected = KinematicSelection(iparticle,0);
146 if (!selected) {
380956c5 147 Double_t pz = iparticle->Pz();
148 Double_t e = iparticle->Energy();
149 Double_t y;
150 if ((e-pz) == 0) {
a48e3376 151 y = 20.;
380956c5 152 } else if ((e+pz) == 0.) {
a48e3376 153 y = -20.;
380956c5 154 } else {
a48e3376 155 y = 0.5*TMath::Log((e+pz)/(e-pz));
380956c5 156 }
157 printf("\n Not selected %d %f %f %f %f %f", i,
158 iparticle->Theta(),
159 iparticle->Phi(),
160 iparticle->P(),
161 iparticle->Pt(),
162 y);
602ca0fb 163 //PH delete iparticle;
7b8b3898 164 // continue;
a48e3376 165 }
166 p[0] = iparticle->Px();
167 p[1] = iparticle->Py();
168 p[2] = iparticle->Pz();
169 Int_t idpart = iparticle->GetPdgCode();
170 if(fVertexSmear==kPerTrack) {
171 Rndm(random,6);
172 for (j = 0; j < 3; j++) {
173 origin[j]=fOrigin[j]
174 +fOsigma[j]*TMath::Cos(2*random[2*j]*TMath::Pi())*
175 TMath::Sqrt(-2*TMath::Log(random[2*j+1]));
693caace 176 }
693caace 177 }
380956c5 178 Int_t decayed = iparticle->GetFirstDaughter();
179 Int_t doTracking = fTrackIt && (decayed < 0) &&
7b8b3898 180 (TMath::Abs(idpart) > 10) && selected;
380956c5 181 // printf("*** pdg, first daughter, trk = %d, %d, %d\n",
182 // idpart,decayed, doTracking);
25454878 183 //PH SetTrack(doTracking,-1,idpart,p,origin,polar,0,kPPrimary,nt);
184 Int_t parent = iparticle->GetFirstMother();
185 SetTrack(doTracking,parent,idpart,p,origin,polar,0,kPPrimary,nt);
380956c5 186 KeepTrack(nt);
187 } // track loop
188
189 break;
190
191 } // event loop
192
193 SetHighWaterMark(nt);
2c354237 194 CdEventFile();
195}
380956c5 196
2c354237 197void AliGenExtFile::CdEventFile()
198{
199// CD back to the event file
a48e3376 200 TFile *pFile=0;
a48e3376 201 if (!gAlice) {
202 gAlice = (AliRun*)pFile->Get("gAlice");
203 if (gAlice) printf("AliRun object found on file\n");
204 if (!gAlice) gAlice = new AliRun("gAlice","Alice test program");
205 }
206 TTree *fAli=gAlice->TreeK();
207 if (fAli) pFile =fAli->GetCurrentFile();
2c354237 208 pFile->cd();
693caace 209}
210
211
f87cfe57 212AliGenExtFile& AliGenExtFile::operator=(const AliGenExtFile& rhs)
213{
214// Assignment operator
215 return *this;
216}
217
693caace 218
219
220
221
222
223
224