DetectorConstruction0.cc

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#include "DetectorConstruction0.hh"

#include "G4Material.hh"
#include "G4NistManager.hh"
#include "G4Box.hh"
#include "G4LogicalVolume.hh"
#include "G4PVPlacement.hh"
#include "G4GenericMessenger.hh"

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DetectorConstruction0::DetectorConstruction0(
                              const G4String& materialName,
                              G4double hx, G4double hy, G4double hz)
 : G4VUserDetectorConstruction(),
   fMessenger(nullptr),
   fMaterialName(materialName),
   fDimensions(hx, hy, hz),
   fWorldVolume(nullptr)
{
  DefineCommands();
}

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DetectorConstruction0::~DetectorConstruction0()
{
  delete fMessenger;
}

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G4VPhysicalVolume* DetectorConstruction0::Construct()
{
  // Define materials via NIST manager
  //
  auto nistManager = G4NistManager::Instance();

  auto material = nistManager->FindOrBuildMaterial(fMaterialName);
 
  // World
  //
  auto sWorld 
    = new G4Box("World",                        //name
                 fDimensions.x(),               //dimensions (half-lentghs)
                 fDimensions.y(), 
                 fDimensions.z());

  fWorldVolume 
    = new G4LogicalVolume(sWorld,               //shape
                          material,             //material
                          "World");             //name

  auto pWorld 
    = new G4PVPlacement(0,                      //no rotation
                        G4ThreeVector(),        //at (0,0,0)
                        fWorldVolume,           //logical volume
                        "World",                //name
                        0,                      //mother  volume
                        false,                  //no boolean operation
                        0);                     //copy number

  //always return the root volume
  //
  return pWorld;
}

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void DetectorConstruction0::SetMaterial(const G4String& materialName)
{
  auto nistManager = G4NistManager::Instance();

  auto newMaterial = nistManager->FindOrBuildMaterial(materialName);
  if ( ! newMaterial ) {
    G4cerr << "Material " << materialName << " not found." << G4endl;
    G4cerr << "The box material was not changed." << G4endl;
    return;
  }  
   
  if ( fWorldVolume ) fWorldVolume->SetMaterial(newMaterial);
  G4cout << "Material of box changed to " << materialName << G4endl;
}

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void DetectorConstruction0::SetDimensions(G4ThreeVector dimensions)
{

  fDimensions = dimensions;
}  
                                     
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void DetectorConstruction0::DefineCommands()
{
  // Define /B5/detector command directory using generic messenger class
  fMessenger = new G4GenericMessenger(this, 
                                      "/detector/", 
                                      "Detector control");

  // setMaterial command
  auto& setMaterialCmd
    = fMessenger->DeclareMethod("setMaterial",
        &DetectorConstruction0::SetMaterial, 
        "Set world material name.");
  setMaterialCmd.SetParameterName("materialName", false);
  setMaterialCmd.SetDefaultValue("G4_AIR");
  setMaterialCmd.SetStates(G4State_PreInit);

  // setDimensions command
  auto& setDimensionsCmd
    = fMessenger->DeclareMethodWithUnit("setDimensions", "mm",
        &DetectorConstruction0::SetDimensions, 
        "Set world dimensions (in half lentgh).");
  setDimensionsCmd.SetParameterName("dimensions", false);
  setDimensionsCmd.SetStates(G4State_PreInit);
}
                                     
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