1 /**************************************************************************
2 * Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. *
4 * Author: The ALICE Off-line Project. *
5 * Contributors are mentioned in the code where appropriate. *
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 **************************************************************************/
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);
32 #include <Riostream.h>
35 #include "AliGenExtFile.h"
36 #include "AliRunLoader.h"
37 #include "AliHeader.h"
39 #include "AliGenEventHeader.h"
40 #include "AliGenReader.h"
42 #include <TParticle.h>
49 ClassImp(AliGenExtFile)
51 AliGenExtFile::AliGenExtFile()
63 AliGenExtFile::AliGenExtFile(Int_t npart)
71 fTitle = "Primaries from ext. File";
74 //____________________________________________________________
75 AliGenExtFile::~AliGenExtFile()
81 //___________________________________________________________
82 void AliGenExtFile::Init()
85 if (fReader) fReader->Init();
88 //___________________________________________________________
89 void AliGenExtFile::Generate()
93 Double_t polar[3] = {0,0,0};
95 Double_t origin[3] = {0,0,0};
102 if (fVertexSmear == kPerEvent) Vertex();
104 // Fast forward up to start Event
105 for (Int_t ie=0; ie<fStartEvent; ++ie ) {
106 Int_t nTracks = fReader->NextEvent();
108 // printf("\n No more events !!! !\n");
109 Warning("AliGenExtFile::Generate","\nNo more events in external file!!!\nLast event may be empty or incomplete.\n");
112 for (Int_t i=0; i<nTracks; ++i) {
113 if (NULL == fReader->NextParticle())
114 AliFatal("Error while skipping tracks");
116 cout << "Skipping event " << ie << endl;
118 fStartEvent = 0; // do not skip events the second time
121 Int_t nTracks = fReader->NextEvent();
123 // printf("\n No more events !!! !\n");
124 Warning("AliGenExtFile::Generate","\nNo more events in external file!!!\nLast event may be empty or incomplete.\n");
129 // Particle selection loop
131 // The selection criterium for the external file generator is as follows:
133 // 1) All tracks are subject to the cuts defined by AliGenerator, i.e.
134 // fThetaMin, fThetaMax, fPhiMin, fPhiMax, fPMin, fPMax, fPtMin, fPtMax,
136 // If the particle does not satisfy these cuts, it is not put on the
138 // 2) If fCutOnChild and some specific child is selected (e.g. if
139 // fForceDecay==kSemiElectronic) the event is rejected if NOT EVEN ONE
140 // child falls into the child-cuts.
141 TParticle* iparticle = 0x0;
144 // Count the selected children
146 while ((iparticle=fReader->NextParticle()) ) {
147 Int_t kf = CheckPDGCode(iparticle->GetPdgCode());
149 if (ChildSelected(kf) && KinematicSelection(iparticle, 1)) {
153 if (!nSelected) continue; // No particle selected: Go to next event
154 fReader->RewindEvent();
158 // Stack filling loop
161 for (i = 0; i < nTracks; i++) {
162 TParticle* jparticle = fReader->NextParticle();
163 Bool_t selected = KinematicSelection(jparticle,0);
164 if (!selected) continue;
165 p[0] = jparticle->Px();
166 p[1] = jparticle->Py();
167 p[2] = jparticle->Pz();
168 p[3] = jparticle->Energy();
170 Int_t idpart = jparticle->GetPdgCode();
171 if(fVertexSmear==kPerTrack)
174 for (j = 0; j < 3; j++) {
175 origin[j]=fOrigin[j]+
176 fOsigma[j]*TMath::Cos(2*random[2*j]*TMath::Pi())*
177 TMath::Sqrt(-2*TMath::Log(random[2*j+1]));
180 time = fTimeOrigin + fOsigma[2]/TMath::Ccgs()*
181 TMath::Cos(2*random[0]*TMath::Pi())*
182 TMath::Sqrt(-2*TMath::Log(random[1]));
184 origin[0] = fVertex[0] + jparticle->Vx();
185 origin[1] = fVertex[1] + jparticle->Vy();
186 origin[2] = fVertex[2] + jparticle->Vz();
187 time = fTime + jparticle->T();
189 Int_t doTracking = fTrackIt && selected && (jparticle->TestBit(kTransportBit));
190 Int_t parent = jparticle->GetFirstMother();
192 PushTrack(doTracking, parent, idpart,
193 p[0], p[1], p[2], p[3], origin[0], origin[1], origin[2], time,
194 polar[0], polar[1], polar[2],
195 kPPrimary, nt, 1., jparticle->GetStatusCode());
201 // Generated event header
203 AliGenEventHeader * header = new AliGenEventHeader();
204 header->SetNProduced(fNprimaries);
205 header->SetPrimaryVertex(fVertex);
206 header->SetInteractionTime(fTime);
212 SetHighWaterMark(nt);
216 //___________________________________________________________
217 void AliGenExtFile::CdEventFile()
219 // CD back to the event file
220 AliRunLoader::Instance()->CdGAFile();