examples/extended/physicslists/shared/src/PrimaryGeneratorAction.cc

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// $Id: PrimaryGeneratorAction 100946 2016-11-03 11:28:08Z gcosmo $
// 

#include "PrimaryGeneratorAction.hh"

#include "G4RunManager.hh"
#include "G4LogicalVolumeStore.hh"
#include "G4LogicalVolume.hh"
#include "G4Box.hh"
#include "G4Event.hh"
#include "G4ParticleGun.hh"
#include "G4ParticleTable.hh"
#include "G4Proton.hh"
#include "G4SystemOfUnits.hh"
#include "Randomize.hh"

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PrimaryGeneratorAction::PrimaryGeneratorAction()
 : G4VUserPrimaryGeneratorAction(),
   fParticleGun(nullptr)
{
  G4int nofParticles = 1;
  fParticleGun = new G4ParticleGun(nofParticles);

  // default particle kinematic
  fParticleGun->SetParticleMomentumDirection(G4ThreeVector(0.,0.,1.));
  fParticleGun->SetParticleEnergy(1.*GeV);
  fParticleGun->SetParticleDefinition(G4Proton::Proton());
}

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

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void PrimaryGeneratorAction::GeneratePrimaries(G4Event* anEvent)
{
  // This function is called at the begining of event

  // In order to avoid dependence of PrimaryGeneratorAction
  // on DetectorConstruction class we get world volume 
  // from G4LogicalVolumeStore
  //
  G4double worldZHalfLength = 0.;
  auto worldLV = G4LogicalVolumeStore::GetInstance()->GetVolume("World");

  // Check that the world volume has box shape
  G4Box* worldBox = nullptr;
  if (  worldLV ) {
    worldBox = dynamic_cast<G4Box*>(worldLV->GetSolid());
  }

  if ( worldBox ) {
    worldZHalfLength = worldBox->GetZHalfLength();  
  }
  else  {
    G4ExceptionDescription msg;
    msg << "World volume of box shape not found." << G4endl;
    msg << "Perhaps you have changed geometry." << G4endl;
    msg << "The gun will be place in the center.";
    G4Exception("PrimaryGeneratorAction::GeneratePrimaries()",
      "MyCode0002", JustWarning, msg);
  } 
  
  // Set gun position
  fParticleGun
    ->SetParticlePosition(G4ThreeVector(0., 0., -worldZHalfLength));

  fParticleGun->GeneratePrimaryVertex(anEvent);
}

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