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//
// $Id: MyPrimaryGeneratorAction.cc,v 1.6 2006/06/29 21:34:30 gunter Exp $
// GEANT4 tag $Name:  $
//

#include "MyPrimaryGeneratorAction.hh"

#include "G4Event.hh"

#ifdef GPS
#include "G4GeneralParticleSource.hh"
#else
#include "G4ParticleGun.hh"
#endif

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

MyPrimaryGeneratorAction::MyPrimaryGeneratorAction()
{
  G4int n_particle = 1;
#ifdef GPS
  particleGun = new G4GeneralParticleSource;
#else
  particleGun = new G4ParticleGun(n_particle);
#endif
  G4ParticleTable* particleTable = G4ParticleTable::GetParticleTable();
  G4String particleName;
  G4ParticleDefinition* particle 
    = particleTable->FindParticle(particleName="geantino");
  particleGun->SetParticleDefinition(particle);

#ifndef GPS
  particleGun->SetParticleMomentumDirection(G4ThreeVector(0.,1.,0.));
  particleGun->SetParticleEnergy(100.*GeV);
  particleGun->SetParticlePosition(G4ThreeVector(0.*cm,-300.*cm,0.*cm));
#endif
}

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

void MyPrimaryGeneratorAction::GeneratePrimaries(G4Event* anEvent)
{
  particleGun->GeneratePrimaryVertex(anEvent);
}

#ifdef GPS
G4GeneralParticleSource* MyPrimaryGeneratorAction::GetGeneralParticleSource()
{
  return particleGun;
} 
#else
G4ParticleGun* MyPrimaryGeneratorAction::GetParticleGun()
{
  return particleGun;
} 
#endif