examples/extended/medical/dna/slowing/src/PrimaryGeneratorAction.cc

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//
// This example is provided by the Geant4-DNA collaboration
// Any report or published results obtained using the Geant4-DNA software 
// shall cite the following Geant4-DNA collaboration publications:
// Phys. Med. 31 (2015) 861-874
// Med. Phys. 37 (2010) 4692-4708
// The Geant4-DNA web site is available at http://geant4-dna.org
//
// $Id$
//

#include "PrimaryGeneratorAction.hh"

#include "G4ParticleTable.hh"
#include "G4StateManager.hh"
#include "G4SystemOfUnits.hh"
#include "G4RandomDirection.hh"

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PrimaryGeneratorAction::PrimaryGeneratorAction()
:G4VUserPrimaryGeneratorAction(),
fpParticleGun(0)
{
  G4int n_particle = 1;
  fpParticleGun  = new G4ParticleGun(n_particle);

  G4ParticleDefinition* particle
           = G4ParticleTable::GetParticleTable()->FindParticle("e-");
  fpParticleGun->SetParticleDefinition(particle);
  fpParticleGun->SetParticleEnergy(100*eV);
  fpParticleGun->SetParticlePosition(G4ThreeVector(0.,0.,0.));
  fpParticleGun->SetParticleMomentumDirection(G4RandomDirection());
}

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PrimaryGeneratorAction::~PrimaryGeneratorAction()
{
  G4StateManager::GetStateManager()->DeregisterDependent(this);
  if (fpParticleGun) delete fpParticleGun;
}

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void PrimaryGeneratorAction::GeneratePrimaries(G4Event* anEvent)
{
  fpParticleGun->GeneratePrimaryVertex(anEvent);
}

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G4bool PrimaryGeneratorAction::Notify(G4ApplicationState requestedState)
{
  if(requestedState == G4State_Idle)
  {
    if(fpParticleGun != 0) return true;

    fpParticleGun  = new G4ParticleGun(1);

    // Define default primary
    G4ParticleDefinition* particle
             = G4ParticleTable::GetParticleTable()->FindParticle("e-");
    fpParticleGun->SetParticleDefinition(particle);
    fpParticleGun->SetParticleEnergy(100*eV);
    fpParticleGun->SetParticlePosition(G4ThreeVector(0.,0.,0.));
    fpParticleGun->SetParticleMomentumDirection(G4RandomDirection());
  }

  return true;
}

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