examples/extended/hadronic/Hadr01/src/PrimaryGeneratorAction.cc

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/// \file hadronic/Hadr01/src/PrimaryGeneratorAction.cc
/// \brief Implementation of the PrimaryGeneratorAction class
//
// $Id: PrimaryGeneratorAction.cc 70761 2013-06-05 12:30:51Z gcosmo $
//
/////////////////////////////////////////////////////////////////////////
//
// PrimaryGeneratorAction
//
// 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 "G4SystemOfUnits.hh"
#include "HistoManager.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* anEvent)
{
  if(fHisto->DefaultBeamPosition()) {
    G4double zVertex = -(5.0*mm + fHisto->Length());
    fParticleGun->SetParticlePosition(G4ThreeVector(0.,0.,zVertex));
  }
  fParticleGun->GeneratePrimaryVertex(anEvent);
}

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