Dicom2PrimaryGeneratorAction.cc

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// $Id: Dicom2PrimaryGeneratorAction.cc 94307 2015-11-11 13:42:46Z gcosmo $
//

#include "Dicom2PrimaryGeneratorAction.hh"

#include "G4LogicalVolumeStore.hh"
#include "G4LogicalVolume.hh"
#include "G4Box.hh"
#include "G4RunManager.hh"
#include "G4ParticleGun.hh"
#include "G4ParticleTable.hh"
#include "G4ParticleDefinition.hh"
#include "G4SystemOfUnits.hh"
#include "Randomize.hh"

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Dicom2PrimaryGeneratorAction::Dicom2PrimaryGeneratorAction()
: G4VUserPrimaryGeneratorAction(),
  fParticleGun(0), 
  fEnvelopeBox(0)
{
    G4int n_particle = 1;
    fParticleGun  = new G4ParticleGun(n_particle);

    // default particle kinematic
    G4ParticleTable* particleTable = G4ParticleTable::GetParticleTable();
    G4String particleName;
    G4ParticleDefinition* particle
            = particleTable->FindParticle(particleName="gamma");
    fParticleGun->SetParticleDefinition(particle);
    fParticleGun->SetParticleMomentumDirection(G4ThreeVector(0.,0.,1.));
    fParticleGun->SetParticleEnergy(6.*MeV);
}

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Dicom2PrimaryGeneratorAction::~Dicom2PrimaryGeneratorAction()
{
    delete fParticleGun;
}

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void Dicom2PrimaryGeneratorAction::GeneratePrimaries(G4Event* anEvent)
{
    //this function is called at the begining of ecah event
    //

    // In order to avoid dependence of PrimaryGeneratorAction
    // on DetectorConstruction class we get phantomContainer volume
    // from G4LogicalVolumeStore.

    G4double envSizeXY = 0;
    G4double envSizeZ = 0;

    if (!fEnvelopeBox)
    {
        G4LogicalVolume* envLV
                = G4LogicalVolumeStore::GetInstance()->GetVolume("phantomContainer");
        if ( envLV ) fEnvelopeBox = dynamic_cast<G4Box*>(envLV->GetSolid());
    }

    if ( fEnvelopeBox ) {
        envSizeXY = fEnvelopeBox->GetXHalfLength()*2.;
        envSizeZ = fEnvelopeBox->GetZHalfLength()*2.;
    }
    else  {
        G4ExceptionDescription msg;
        msg << "Envelope volume of box shape not found.\n";
        msg << "Perhaps you have changed geometry.\n";
        msg << "The gun will be place at the center.";
        G4Exception("Dicom2PrimaryGeneratorAction::GeneratePrimaries()",
                    "MyCode0002",JustWarning,msg);
    }

    G4double size = 0.8;
    G4double x0 = size * envSizeXY * (G4UniformRand()-0.5);
    G4double y0 = size * envSizeXY * (G4UniformRand()-0.5);
    G4double z0 = -0.5 * envSizeZ;

    fParticleGun->SetParticlePosition(G4ThreeVector(x0,y0,z0));

    fParticleGun->GeneratePrimaryVertex(anEvent);
}

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