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/// \file electromagnetic/TestEm8/src/PrimaryGeneratorAction.cc
/// \brief Implementation of the PrimaryGeneratorAction class
//
// $Id: PrimaryGeneratorAction.cc 95713 2016-02-22 08:08:38Z gcosmo $
//
/////////////////////////////////////////////////////////////////////////
//
// TestEm8: Gaseous detector
//
// Created: 31.08.2010 V.Ivanchenko
//
// Modified:
//
////////////////////////////////////////////////////////////////////////
//

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#include "PrimaryGeneratorAction.hh"
#include "G4Event.hh"
#include "G4Electron.hh"
#include "G4SystemOfUnits.hh"
#include "TestParameters.hh"

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PrimaryGeneratorAction::PrimaryGeneratorAction()
 : G4VUserPrimaryGeneratorAction(),
   fParticleGun(0)
{
  fParticleGun  = new G4ParticleGun(1);
  fParticleGun->SetParticleDefinition(G4Electron::Electron());
  fParticleGun->SetParticleMomentumDirection(G4ThreeVector(0.,0.,1.));
  fParticleGun->SetParticleEnergy(1.*GeV);
  fParam = TestParameters::GetPointer();
}

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

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void PrimaryGeneratorAction::GeneratePrimaries(G4Event* anEvent)
{
  G4double z = fParam->GetPositionZ();
  if(0 == anEvent->GetEventID()) {
    fParam->SetBeamParticle(fParticleGun->GetParticleDefinition());
    fParam->SetBeamEnergy(fParticleGun->GetParticleEnergy());
  }
  fParticleGun->SetParticlePosition(G4ThreeVector(0.,0.,z));
  fParticleGun->GeneratePrimaryVertex(anEvent);
}

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