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//
// $Id: ExN01PrimaryGeneratorAction.cc,v 1.5 2006/06/29 19:10:48 gunter Exp $
// GEANT4 tag $Name:  $
//

#include "ExN01PrimaryGeneratorAction.hh"

#include "G4Event.hh"
#include "G4ParticleGun.hh"
#include "G4ParticleTable.hh"
#include "G4ParticleDefinition.hh"
#include "globals.hh"

ExN01PrimaryGeneratorAction::ExN01PrimaryGeneratorAction()
{
  G4int n_particle = 1;
  particleGun = new G4ParticleGun(n_particle);

  G4ParticleTable* particleTable = G4ParticleTable::GetParticleTable();
  G4String particleName;
  particleGun->SetParticleDefinition(particleTable->FindParticle(particleName="geantino"));
  particleGun->SetParticleEnergy(1.0*GeV);
  particleGun->SetParticlePosition(G4ThreeVector(-2.0*m, 0.0, 0.0));
}

ExN01PrimaryGeneratorAction::~ExN01PrimaryGeneratorAction()
{
  delete particleGun;
}

void ExN01PrimaryGeneratorAction::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;
  }
  particleGun->SetParticleMomentumDirection(v);
  particleGun->GeneratePrimaryVertex(anEvent);
}