//
// ********************************************************************
// * License and Disclaimer                                           *
// *                                                                  *
// * The  Geant4 software  is  copyright of the Copyright Holders  of *
// * the Geant4 Collaboration.  It is provided  under  the terms  and *
// * conditions of the Geant4 Software License,  included in the file *
// * LICENSE and available at  http://cern.ch/geant4/license .  These *
// * include a list of copyright holders.                             *
// *                                                                  *
// * Neither the authors of this software system, nor their employing *
// * institutes,nor the agencies providing financial support for this *
// * work  make  any representation or  warranty, express or implied, *
// * regarding  this  software system or assume any liability for its *
// * use.  Please see the license in the file  LICENSE  and URL above *
// * for the full disclaimer and the limitation of liability.         *
// *                                                                  *
// * This  code  implementation is the result of  the  scientific and *
// * technical work of the GEANT4 collaboration.                      *
// * By using,  copying,  modifying or  distributing the software (or *
// * any work based  on the software)  you  agree  to acknowledge its *
// * use  in  resulting  scientific  publications,  and indicate your *
// * acceptance of all terms of the Geant4 Software license.          *
// ********************************************************************
//
/// \file DetectorConstruction.cc
/// \brief Implementation of the DetectorConstruction class
//
// 
//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......

#include "DetectorConstruction.hh"

#include "G4NistManager.hh"
#include "G4Box.hh"
#include "G4LogicalVolume.hh"
#include "G4PVPlacement.hh"
#include "G4SystemOfUnits.hh"

//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......

DetectorConstruction::DetectorConstruction()
 : G4VUserDetectorConstruction()
{
  fWorldSize = 20*mm;
}

//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......

DetectorConstruction::~DetectorConstruction()
{}

//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......

G4VPhysicalVolume* DetectorConstruction::Construct()
{
  //
  // define a material
  //   
  G4Material* Air =
  G4NistManager::Instance()->FindOrBuildMaterial("G4_AIR"); 
  
  //     
  // World
  //
  G4Box*  
  solidWorld = new G4Box("World",                          //its name
                   fWorldSize/2,fWorldSize/2,fWorldSize/2);//its size
                   
  G4LogicalVolume*                         
  logicWorld = new G4LogicalVolume(solidWorld,             //its solid
                                   Air,                    //its material
                                   "World");               //its name
  G4VPhysicalVolume*                                   
  physiWorld = new G4PVPlacement(0,                      //no rotation
                                 G4ThreeVector(),        //at (0,0,0)
                                 logicWorld,             //its logical volume
                                 "World",                //its name
                                 0,                      //its mother  volume
                                 false,                  //no boolean operation
                                 0);                     //copy number
                
  //
  //always return the physical World
  //  
  return physiWorld;
}

//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
