examples/extended/exoticphysics/monopole/src/PrimaryGeneratorAction.cc

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// $Id: PrimaryGeneratorAction.cc 104872 2017-06-23 14:19:16Z gcosmo $
//
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#include "PrimaryGeneratorAction.hh"
#include "DetectorConstruction.hh"
#include "G4ParticleGun.hh"
#include "G4ParticleDefinition.hh"
#include "G4Event.hh"
#include "G4SystemOfUnits.hh"

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PrimaryGeneratorAction::PrimaryGeneratorAction(DetectorConstruction* det)
  :G4VUserPrimaryGeneratorAction(),fParticleGun(0),fDetector(det),
   bPrimPositionDefined(false)
{
  fParticleGun  = new G4ParticleGun(1);
  fParticleGun->SetParticleEnergy(100 * GeV);
  fParticleGun->SetParticleMomentumDirection(G4ThreeVector(1., 0., 0.));
}

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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
  if(0 == anEvent->GetEventID() || !bPrimPositionDefined) {
    G4double x0 = -0.5*(fDetector->GetWorldSizeX()) + 1*um;
    fParticleGun->SetParticlePosition(G4ThreeVector(x0,0.0,0.0));
    bPrimPositionDefined = true;
  }  

  fParticleGun->GeneratePrimaryVertex(anEvent);
}

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