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// $Id: PrimaryGeneratorAction.cc,v 1.1 2006/10/02 13:48:10 vnivanch Exp $
// GEANT4 tag $Name: geant4-09-04-beta-01 $
// 
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#include "PrimaryGeneratorAction.hh"

#include "DetectorConstruction.hh"

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

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PrimaryGeneratorAction::PrimaryGeneratorAction(DetectorConstruction* det)
:detector(det)					       
{
  particleGun  = new G4ParticleGun(1);
  G4ParticleDefinition* particle
           = G4ParticleTable::GetParticleTable()->FindParticle("e-");
  particleGun->SetParticleDefinition(particle);
  particleGun->SetParticleEnergy(10*MeV);    
  particleGun->SetParticleMomentumDirection(G4ThreeVector(0.,0.,1.));
}

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

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void PrimaryGeneratorAction::GeneratePrimaries(G4Event* anEvent)
{
  //this function is called at the begining of event
  //
  G4double halfSize = 0.5*(detector->GetWorldSize());
  G4double z0 = - halfSize;
  
  particleGun->SetParticlePosition(G4ThreeVector(0., 0., z0));
  particleGun->GeneratePrimaryVertex(anEvent);
}

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