examples/extended/medical/dna/slowing/src/DetectorConstruction.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 
// shall cite the following Geant4-DNA collaboration publications:
// Phys. Med. 31 (2015) 861-874
// Med. Phys. 37 (2010) 4692-4708
// The Geant4-DNA web site is available at http://geant4-dna.org
//
// $Id$
//

#include "DetectorConstruction.hh"
#include "DetectorMessenger.hh"

#include "G4SystemOfUnits.hh"
#include "G4UserLimits.hh"
#include "G4NistManager.hh"
#include "G4UnitsTable.hh"
#include "G4LogicalVolumeStore.hh"
#include "G4RunManager.hh"

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DetectorConstruction::DetectorConstruction() :
    G4VUserDetectorConstruction(), fWaterMaterial(0)
{
  // create commands for interactive definition of the detector  
  fDetectorMessenger = new DetectorMessenger(this);

  //default tracking cut  
  fTrackingCut = 7.4*eV;
}

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DetectorConstruction::~DetectorConstruction()
{
  delete fDetectorMessenger;
}

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G4VPhysicalVolume* DetectorConstruction::Construct()

{
  DefineMaterials();
  return ConstructDetector();
}

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void DetectorConstruction::DefineMaterials()
{

  // Water is defined from NIST material database
  G4NistManager * man = G4NistManager::Instance();

  G4Material * H2O = man->FindOrBuildMaterial("G4_WATER");

  fWaterMaterial = H2O;

  G4cout << *(G4Material::GetMaterialTable()) << G4endl;
}

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G4VPhysicalVolume* DetectorConstruction::ConstructDetector()
{

  // WORLD VOLUME

  G4double worldSizeX = 1 * m;
  G4double worldSizeY = worldSizeX;
  G4double worldSizeZ = worldSizeX;

  G4Box* solidWorld = new G4Box("World",               //its name
      worldSizeX / 2, worldSizeY / 2, worldSizeZ / 2); //its size

  fLogicWorld = new G4LogicalVolume(solidWorld, //its solid
      fWaterMaterial, //its material
      "World"); //its name

  G4PVPlacement* physiWorld = new G4PVPlacement(
      0, //no rotation
      G4ThreeVector(), //at (0,0,0)
      fLogicWorld,
      "World", //its name
      0, //its mother  volume
      false, //no boolean operation
      0); //copy number

  // Visualization attributes
  G4VisAttributes* worldVisAtt = new G4VisAttributes(G4Colour(1.0, 1.0, 1.0));
  worldVisAtt->SetVisibility(true);
  fLogicWorld->SetVisAttributes(worldVisAtt);

  G4VisAttributes* worldVisAtt1 = new G4VisAttributes(G4Colour(1.0, 0.0, 0.0));
  worldVisAtt1->SetVisibility(true);

  // Tracking cut
  fLogicWorld->SetUserLimits(new G4UserLimits(DBL_MAX,DBL_MAX,DBL_MAX,
    fTrackingCut));    

  PrintParameters();

  return physiWorld;
}

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void DetectorConstruction::SetMaterial(G4String materialChoice)
{
  // search the material by its name   
  G4Material* pttoMaterial = G4Material::GetMaterial(materialChoice);     
  if (pttoMaterial) fWaterMaterial = pttoMaterial;
  G4RunManager::GetRunManager()->PhysicsHasBeenModified();  
}

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void DetectorConstruction::SetTrackingCut(G4double value)
{
  fTrackingCut = value;
  G4RunManager::GetRunManager()->ReinitializeGeometry();  
}

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void DetectorConstruction::PrintParameters() const
{
  G4cout << "\n---------------------------------------------------------\n";
  G4cout << "---> The tracking cut is set to " 
         << G4BestUnit(fTrackingCut,"Energy") << G4endl;
  G4cout << "\n---------------------------------------------------------\n";
}

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