examples/extended/hadronic/Hadr02/src/PrimaryGeneratorAction.cc

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// $Id: PrimaryGeneratorAction.cc 81932 2014-06-06 15:39:45Z gcosmo $
//
//
// EventActionMessenger
//
// Created: 31.01.03 V.Ivanchenko
//
// Modified:
// 04.06.2006 Adoptation of hadr01 (V.Ivanchenko)
// 16.11.2006 Add option allowing to have user defined beam position (VI)
//
//

#include "PrimaryGeneratorAction.hh"
#include "G4ParticleGun.hh"
#include "HistoManager.hh"
#include "G4Event.hh"
#include "G4SystemOfUnits.hh"

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PrimaryGeneratorAction::PrimaryGeneratorAction()
 : G4VUserPrimaryGeneratorAction(),
   fParticleGun(0),
   fHisto(0)
{
  fParticleGun  = new G4ParticleGun(1);
  fParticleGun->SetParticleMomentumDirection(G4ThreeVector(0.,0.,1.));
  fHisto = HistoManager::GetPointer();
}

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PrimaryGeneratorAction::~PrimaryGeneratorAction()
{
  delete fParticleGun;
}

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void PrimaryGeneratorAction::GeneratePrimaries(G4Event* event)
{
  if (event->GetEventID() == 0) {
    if (fHisto->DefaultBeamPosition()) {
      G4double zVertex = -(5.0*mm + fHisto->Length());
      fParticleGun->SetParticlePosition(G4ThreeVector(0.,0.,zVertex));
    }
  }
  fParticleGun->GeneratePrimaryVertex(event);
}

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