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//
/// \file fpDetectorConstruction.cc
/// \brief Implementation of the fpDetectorConstruction class

#include "fpDetectorConstruction.hh"

#include "G4RunManager.hh"
#include "G4NistManager.hh"
#include "G4Box.hh"
#include "G4Cons.hh"
#include "G4Orb.hh"
#include "G4Sphere.hh"
#include "G4Trd.hh"
#include "G4LogicalVolume.hh"
#include "G4PVPlacement.hh"
#include "G4SystemOfUnits.hh"
#include "G4Tubs.hh"
#include "G4Element.hh"
#include "G4Material.hh"

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fpDetectorConstruction::fpDetectorConstruction()                                       //fpDetectorConstruction��Ĺ��캯��
	: G4VUserDetectorConstruction{},                                                   //��ԱG4VUserDetectorConstruction��ʼ��
	fScoringVolume{}       
  
{ }

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fpDetectorConstruction::~fpDetectorConstruction()                                       //fpDetectorConstruction�����������
{ }

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G4VPhysicalVolume* fpDetectorConstruction::Construct()                                 //fpDetectorConstruction���Construct����
{  
  // Get nist material manager
  G4NistManager* nist = G4NistManager::Instance();    
  
  // Envelope parameters
  //
 
  
   
  // Option to switch on/off checking of volumes overlaps
  //
  G4bool checkOverlaps = true;

  //     
  // World
  //
 
  G4Material* world_mat = nist->FindOrBuildMaterial("G4_Galactic");
  
  G4Sphere* solidWorld =    
    new G4Sphere("World",                                       //its name
      0,50*cm,0,360*deg,0,180*deg);                             //its size
      
  G4LogicalVolume* logicWorld =                         
    new G4LogicalVolume(solidWorld,                             //its solid
                        world_mat,                              //its material
                        "World");                               //its name
                                   
  G4VPhysicalVolume* physWorld = 
    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
                      checkOverlaps);                           //overlaps checking


 
                     
  //     
  //  Polyethylene Using Thermal Scattering Data by Using Name "TS_H_of_Polyethylene"
  //  and Setting Concerning PhysicsList 
  // 
  G4Element* H1 = new  G4Element("Hydrogen", "H", 1, 1.01 * g / mole);
  G4Element* C = new  G4Element("Carbon", "C", 6, 12 * g / mole);
  G4Element* He = new  G4Element("He", "He", 2, 4.01 * g / mole);


 // G4Material* gas = new G4Material("Gas", 1.79732e-4 * g / cm3, 3,kStateGas,1.2*atmosphere,293.15*kelvin);
  G4Material* gas = new G4Material("Gas", 1.79732e-4 * g / cm3, 3,kStateGas,293.15*kelvin,1.2*atmosphere);
  gas->AddElement(H1, 0.8);
  gas->AddElement(C, 0.2);
  gas->AddElement(He, 1);


  
  G4Box* solid_detector =
      new G4Box("detector",                                            //its name
          2.5 * cm, 2.5 * cm, 2.5 * cm);                               //its size
      
  G4LogicalVolume* logic_detector =                         
    new G4LogicalVolume(solid_detector,                                 //its solid
		                    gas,                                            //its material
                        "detector");                                   //its name
               
  G4VPhysicalVolume* physical_detector=
      new G4PVPlacement(0,                                          //no rotation
                    G4ThreeVector(0,0,0),                           //at (0,0,0)
	                  logic_detector,                                     //its logical volume
                    "detector",                                 //its name
                    logicWorld,                                     //its mother  volume
                    false,                                          //no boolean operation
                    0,                                              //copy number
                    checkOverlaps);                                 //overlaps checking
 
 



  //
  fScoringVolume = physical_detector;
  
  //
  //always return the physical World
  //
  return physWorld;
}

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