examples/advanced/dnageometry/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 
// and the DNA geometry given in the Geom_DNA example 
// shall cite the following Geant4-DNA collaboration publications:
// [1] NIM B 298 (2013) 47-54
// [2] Med. Phys. 37 (2010) 4692-4708
// The Geant4-DNA web site is available at http://geant4-dna.org
//
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#include "PrimaryGeneratorAction.hh"
#include "G4SystemOfUnits.hh"
#include "Randomize.hh"

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PrimaryGeneratorAction::PrimaryGeneratorAction(DetectorConstruction* DC)
:Detector(DC)
{
  G4int n_particle = 1;
  particleGun  = new G4ParticleGun(n_particle);

  // default gun parameters
  particleGun->SetParticleEnergy(1.*MeV);
  particleGun->SetParticleMomentumDirection(G4ThreeVector(0.,0.,1.));
  
}

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

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void PrimaryGeneratorAction::GeneratePrimaries(G4Event* anEvent)
{
G4double x0,y0,z0;

x0=((16.0*G4UniformRand())-8.0)*micrometer;
y0=((8.0*G4UniformRand())-4.0)*micrometer;
z0=-2.99*micrometer;
  particleGun->SetParticlePosition(G4ThreeVector(x0,y0,z0));
  particleGun->GeneratePrimaryVertex(anEvent);
}