Import Geant4 5.0.0 source tree

2016-06-08 16:57:27 +02:00
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+//
+// ********************************************************************
+// * DISCLAIMER                                                       *
+// *                                                                  *
+// * The following disclaimer summarizes all the specific disclaimers *
+// * of contributors to this software. The specific disclaimers,which *
+// * govern, are listed with their locations in:                      *
+// *   http://cern.ch/geant4/license                                  *
+// *                                                                  *
+// * Neither the authors of this software system, nor their employing *
+// * institutes,nor the agencies providing financial support for this *
+// * work  make  any representation or  warranty, express or implied, *
+// * regarding  this  software system or assume any liability for its *
+// * use.                                                             *
+// *                                                                  *
+// * This  code  implementation is the  intellectual property  of the *
+// * GEANT4 collaboration.                                            *
+// * By copying,  distributing  or modifying the Program (or any work *
+// * based  on  the Program)  you indicate  your  acceptance of  this *
+// * statement, and all its terms.                                    *
+// ********************************************************************
+// $Id: example_MyPythia.cc,v 1.3 2002/12/13 11:42:38 gcosmo Exp $
+// ====================================================================
+//   example_MyPythia.cc
+//
+//   sample event generation using Pythia and HepMC(CLHEP)
+// ====================================================================
+
+#include "CLHEP/HepMC/CBhepevt.h"
+#include "CLHEP/HepMC/WriteHepMC.h"
+#include "CLHEP/HepMC/ReadHepMC.h"
+#include "CLHEP/HepMC/include/PythiaWrapper6_2.h"
+
+#include <string>
+#include <fstream>
+
+// global parameters
+hepev2_t hepev2_;
+hepev3_t hepev3_;
+hepev4_t hepev4_;
+hepev5_t hepev5_;
+
+int main() { 
+  // initialize Pythia...
+  // select W+gamma process (process number 20) 
+  pysubs.msel= 0;
+  pysubs.msub[20-1]= 1;
+  // set random number seed (mandatory!)
+  pydatr.mrpy[0]= 55122 ;
+  // tell Pythia not to write multiple copies of particles in event record.
+  pypars.mstp[128-1]= 2;
+  // example of setting a Pythia parameter: set the top mass 
+  pydat2.pmas[1-1][6-1]= 175;  
+  // call pythia initialization
+  call_pyinit( "CMS", "p", "p", 14000. );
+  
+  // prepare HepMC-HEPEVT interface...
+  HepMC::CBhepevt* hepevtio= new HepMC::CBhepevt;
+  
+  std::ofstream to;
+  std::string fname= "example_MyPythia.dat";
+  to.open(fname.c_str(), std::ios::out);
+
+  HepMC::writeComment(to, "generate sample pythia events...");
+  for ( int i = 1; i <= 10; i++ ) {
+    if ( i%50==1 ) std::cout << "Processing Event Number " 
+			     << i << std::endl;
+    call_pyevnt();  // generate one event with Pythia
+    // pythia pyhepc routine converts common PYJETS in common HEPEVT
+    call_pyhepc( 1 );
+    
+    HepMC::GenEvent* evt= new HepMC::GenEvent();
+    hepevtio-> toGenEvent(evt, false);
+    hepevtio-> clean(); // clear HEPEVT
+    
+    // add some information to the event
+    evt-> set_event_number(i);
+    evt-> set_signal_process_id(20);
+    
+    // write the event out to the ascii file
+    to << evt;
+    
+    // we also need to delete the created event from memory
+    delete evt;
+  }
+
+  // write out some information from Pythia to the screen
+  call_pystat(1);
+  to.close();
+  delete hepevtio;
+  
+  return 0;
+}
+