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>
48 ClassImp(AliGenExtFile)
50 AliGenExtFile::AliGenExtFile()
62 AliGenExtFile::AliGenExtFile(Int_t npart)
70 fTitle = "Primaries from ext. File";
73 //____________________________________________________________
74 AliGenExtFile::~AliGenExtFile()
80 //___________________________________________________________
81 void AliGenExtFile::Init()
84 if (fReader) fReader->Init();
87 //___________________________________________________________
88 void AliGenExtFile::Generate()
92 Double_t polar[3] = {0,0,0};
94 Double_t origin[3] = {0,0,0};
101 if (fVertexSmear == kPerEvent) Vertex();
103 // Fast forward up to start Event
104 for (Int_t ie=0; ie<fStartEvent; ++ie ) {
105 Int_t nTracks = fReader->NextEvent();
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");
111 TParticle* iparticle = 0x0;
112 while ((iparticle=fReader->NextParticle()) ) ;
113 cout << "Skipping event " << ie << endl;
117 Int_t nTracks = fReader->NextEvent();
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");
125 // Particle selection loop
127 // The selection criterium for the external file generator is as follows:
129 // 1) All tracks are subject to the cuts defined by AliGenerator, i.e.
130 // fThetaMin, fThetaMax, fPhiMin, fPhiMax, fPMin, fPMax, fPtMin, fPtMax,
132 // If the particle does not satisfy these cuts, it is not put on the
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.
137 TParticle* iparticle = 0x0;
140 // Count the selected children
142 while ((iparticle=fReader->NextParticle()) ) {
143 Int_t kf = CheckPDGCode(iparticle->GetPdgCode());
145 if (ChildSelected(kf) && KinematicSelection(iparticle, 1)) {
149 if (!nSelected) continue; // No particle selected: Go to next event
150 fReader->RewindEvent();
154 // Stack filling loop
157 for (i = 0; i < nTracks; i++) {
158 TParticle* jparticle = fReader->NextParticle();
159 Bool_t selected = KinematicSelection(jparticle,0);
160 if (!selected) continue;
161 p[0] = jparticle->Px();
162 p[1] = jparticle->Py();
163 p[2] = jparticle->Pz();
164 p[3] = jparticle->Energy();
166 Int_t idpart = jparticle->GetPdgCode();
167 if(fVertexSmear==kPerTrack)
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]));
176 time = fTimeOrigin + fOsigma[2]/TMath::Ccgs()*
177 TMath::Cos(2*random[0]*TMath::Pi())*
178 TMath::Sqrt(-2*TMath::Log(random[1]));
180 origin[0] = fVertex[0] + jparticle->Vx();
181 origin[1] = fVertex[1] + jparticle->Vy();
182 origin[2] = fVertex[2] + jparticle->Vz();
183 time = fTime + jparticle->T();
185 Int_t doTracking = fTrackIt && selected && (jparticle->TestBit(kTransportBit));
186 Int_t parent = jparticle->GetFirstMother();
188 PushTrack(doTracking, parent, idpart,
189 p[0], p[1], p[2], p[3], origin[0], origin[1], origin[2], time,
190 polar[0], polar[1], polar[2],
191 kPPrimary, nt, 1., jparticle->GetStatusCode());
197 // Generated event header
199 AliGenEventHeader * header = new AliGenEventHeader();
200 header->SetNProduced(fNprimaries);
201 header->SetPrimaryVertex(fVertex);
202 header->SetInteractionTime(fTime);
208 SetHighWaterMark(nt);
212 //___________________________________________________________
213 void AliGenExtFile::CdEventFile()
215 // CD back to the event file
216 AliRunLoader::Instance()->CdGAFile();