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>
34 #include "AliGenExtFile.h"
35 #include "AliRunLoader.h"
36 #include "AliHeader.h"
38 #include "AliGenEventHeader.h"
39 #include "AliGenReader.h"
41 #include <TParticle.h>
46 ClassImp(AliGenExtFile)
48 AliGenExtFile::AliGenExtFile()
60 AliGenExtFile::AliGenExtFile(Int_t npart)
68 fTitle = "Primaries from ext. File";
71 //____________________________________________________________
72 AliGenExtFile::~AliGenExtFile()
78 //___________________________________________________________
79 void AliGenExtFile::Init()
82 if (fReader) fReader->Init();
85 //___________________________________________________________
86 void AliGenExtFile::Generate()
90 Double_t polar[3] = {0,0,0};
92 Double_t origin[3] = {0,0,0};
99 if (fVertexSmear == kPerEvent) Vertex();
101 // Fast forward up to start Event
102 for (Int_t ie=0; ie<fStartEvent; ++ie ) {
103 Int_t nTracks = fReader->NextEvent();
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");
109 TParticle* iparticle = 0x0;
110 while ((iparticle=fReader->NextParticle()) ) ;
111 cout << "Skipping event " << ie << endl;
115 Int_t nTracks = fReader->NextEvent();
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");
123 // Particle selection loop
125 // The selection criterium for the external file generator is as follows:
127 // 1) All tracks are subject to the cuts defined by AliGenerator, i.e.
128 // fThetaMin, fThetaMax, fPhiMin, fPhiMax, fPMin, fPMax, fPtMin, fPtMax,
130 // If the particle does not satisfy these cuts, it is not put on the
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.
135 TParticle* iparticle = 0x0;
138 // Count the selected children
140 while ((iparticle=fReader->NextParticle()) ) {
141 Int_t kf = CheckPDGCode(iparticle->GetPdgCode());
143 if (ChildSelected(kf) && KinematicSelection(iparticle, 1)) {
147 if (!nSelected) continue; // No particle selected: Go to next event
148 fReader->RewindEvent();
152 // Stack filling loop
155 for (i = 0; i < nTracks; i++) {
156 TParticle* jparticle = fReader->NextParticle();
157 Bool_t selected = KinematicSelection(jparticle,0);
158 if (!selected) continue;
159 p[0] = jparticle->Px();
160 p[1] = jparticle->Py();
161 p[2] = jparticle->Pz();
162 p[3] = jparticle->Energy();
164 Int_t idpart = jparticle->GetPdgCode();
165 if(fVertexSmear==kPerTrack)
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]));
174 time = fTimeOrigin + fOsigma[2]/TMath::Ccgs()*
175 TMath::Cos(2*random[0]*TMath::Pi())*
176 TMath::Sqrt(-2*TMath::Log(random[1]));
178 origin[0] = fVertex[0] + jparticle->Vx();
179 origin[1] = fVertex[1] + jparticle->Vy();
180 origin[2] = fVertex[2] + jparticle->Vz();
181 time = fTime + jparticle->T();
183 Int_t doTracking = fTrackIt && selected && (jparticle->TestBit(kTransportBit));
184 Int_t parent = jparticle->GetFirstMother();
186 PushTrack(doTracking, parent, idpart,
187 p[0], p[1], p[2], p[3], origin[0], origin[1], origin[2], time,
188 polar[0], polar[1], polar[2],
189 kPPrimary, nt, 1., jparticle->GetStatusCode());
195 // Generated event header
197 AliGenEventHeader * header = new AliGenEventHeader();
198 header->SetNProduced(fNprimaries);
199 header->SetPrimaryVertex(fVertex);
200 header->SetInteractionTime(fTime);
206 SetHighWaterMark(nt);
210 //___________________________________________________________
211 void AliGenExtFile::CdEventFile()
213 // CD back to the event file
214 AliRunLoader::Instance()->CdGAFile();