WLSPhotonDetSD.cc

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#include "WLSPhotonDetSD.hh"
#include "WLSPhotonDetHit.hh"
#include "WLSUserTrackInformation.hh"

#include "G4Track.hh"
#include "G4ThreeVector.hh"
#include "G4Step.hh"
#include "G4ParticleDefinition.hh"
#include "G4VTouchable.hh"
#include "G4TouchableHistory.hh"
#include "G4ios.hh"
#include "G4ParticleTypes.hh"
#include "G4ParticleDefinition.hh"

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WLSPhotonDetSD::WLSPhotonDetSD(G4String name)
  : G4VSensitiveDetector(name), fPhotonDetHitCollection(0)
{
  collectionName.insert("PhotonDetHitCollection");
}

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WLSPhotonDetSD::~WLSPhotonDetSD() { }

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void WLSPhotonDetSD::Initialize(G4HCofThisEvent* HCE)
{
  fPhotonDetHitCollection =
       new WLSPhotonDetHitsCollection(SensitiveDetectorName,collectionName[0]);
  //Store collection with event and keep ID
  static G4int HCID = -1;
  if (HCID<0) HCID = GetCollectionID(0);
  HCE->AddHitsCollection( HCID, fPhotonDetHitCollection );
}

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G4bool WLSPhotonDetSD::ProcessHits(G4Step* , G4TouchableHistory* )
{
  return false;
}

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G4bool WLSPhotonDetSD::ProcessHits_constStep(const G4Step* aStep,
                                             G4TouchableHistory* )
//Generates a hit and uses the postStepPoint; PostStepPoint because the hit
//is generated manually when the photon hits the detector
{
  if (aStep == NULL) return false;
  G4Track* theTrack = aStep->GetTrack();

  // Need to know if this is an optical photon
  if(theTrack->GetDefinition()
     != G4OpticalPhoton::OpticalPhotonDefinition()) return false;

  // Find out information regarding the hit
  G4StepPoint* thePostPoint = aStep->GetPostStepPoint();
 
  WLSUserTrackInformation* trackInformation
      = (WLSUserTrackInformation*)theTrack->GetUserInformation();
 
  G4TouchableHistory* theTouchable
      = (G4TouchableHistory*)(thePostPoint->GetTouchable());
 
  G4ThreeVector photonExit   = trackInformation -> GetExitPosition();
  G4ThreeVector photonArrive = thePostPoint -> GetPosition();
  G4double      arrivalTime  = theTrack -> GetGlobalTime();

  // Convert the global coordinate for arriving photons into
  // the local coordinate of the detector
  photonArrive = theTouchable->GetHistory()->
                                GetTopTransform().TransformPoint(photonArrive);

  // Creating the hit and add it to the collection
  fPhotonDetHitCollection->
            insert(new WLSPhotonDetHit(photonExit, photonArrive, arrivalTime));

  return true;
}