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/// \file persistency/gdml/G04/src/G04PrimaryGeneratorAction.cc
/// \brief Implementation of the G04PrimaryGeneratorAction class
//
//
// $Id: G04PrimaryGeneratorAction.cc 68025 2013-03-13 13:43:46Z gcosmo $
//
//

#include "G04PrimaryGeneratorAction.hh"
#include "G4Event.hh"
#include "G4ParticleGun.hh"
#include "G4ParticleTable.hh"
#include "G4ParticleDefinition.hh"
#include "G4SystemOfUnits.hh"

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

G04PrimaryGeneratorAction::G04PrimaryGeneratorAction()
 : G4VUserPrimaryGeneratorAction(), 
   fParticleGun(0)
{
  G4int n_particle = 1;
  fParticleGun = new G4ParticleGun(n_particle);

  G4ParticleTable* particleTable = G4ParticleTable::GetParticleTable();
  G4String particleName;
  fParticleGun->SetParticleDefinition(
               particleTable->FindParticle(particleName="geantino"));
  fParticleGun->SetParticleEnergy(1.0*GeV);
  fParticleGun->SetParticlePosition(G4ThreeVector(-2.0*m, 0.1, 0.1));
}

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

G04PrimaryGeneratorAction::~G04PrimaryGeneratorAction()
{
  delete fParticleGun;
}

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

void G04PrimaryGeneratorAction::GeneratePrimaries(G4Event* anEvent)
{
  G4int i = anEvent->GetEventID() % 3;
  G4ThreeVector v(1.0,0.0,0.0);
  switch(i)
  {
    case 0:
      break;
    case 1:
      v.setY(0.1);
      break;
    case 2:
      v.setZ(0.1);
      break;
  }
  fParticleGun->SetParticleMomentumDirection(v);
  fParticleGun->GeneratePrimaryVertex(anEvent);
}
