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// $Id: PrimaryGeneratorAction.cc,v 1.4 2006/11/15 14:58:10 vnivanch Exp $
// GEANT4 tag $Name:  $
//
/////////////////////////////////////////////////////////////////////////
//
// 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"

//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......

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

//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......

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

//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......

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

//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......