DriftChamberSD.cc

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/// \file B5/src/DriftChamberSD.cc
/// \brief Implementation of the B5::DriftChamber class
 
#include "DriftChamberSD.hh"
#include "DriftChamberHit.hh"
 
#include "G4HCofThisEvent.hh"
#include "G4TouchableHistory.hh"
#include "G4Track.hh"
#include "G4Step.hh"
#include "G4SDManager.hh"
#include "G4ios.hh"
 
namespace B5
{
 
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DriftChamberSD::DriftChamberSD(G4String name)
: G4VSensitiveDetector(name)
{
  collectionName.insert("driftChamberColl");
}
 
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void DriftChamberSD::Initialize(G4HCofThisEvent* hce)
{
  fHitsCollection
    = new DriftChamberHitsCollection(SensitiveDetectorName,collectionName[0]);
 
  if (fHCID<0) {
     fHCID = G4SDManager::GetSDMpointer()->GetCollectionID(fHitsCollection);
  }
  hce->AddHitsCollection(fHCID,fHitsCollection);
}
 
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G4bool DriftChamberSD::ProcessHits(G4Step* step, G4TouchableHistory*)
{
  auto charge = step->GetTrack()->GetDefinition()->GetPDGCharge();
  if (charge==0.) return true;
 
  auto preStepPoint = step->GetPreStepPoint();
 
  auto touchable = step->GetPreStepPoint()->GetTouchable();
  auto motherPhysical = touchable->GetVolume(1); // mother
  auto copyNo = motherPhysical->GetCopyNo();
 
  auto worldPos = preStepPoint->GetPosition();
  auto localPos
    = touchable->GetHistory()->GetTopTransform().TransformPoint(worldPos);
 
  auto hit = new DriftChamberHit(copyNo);
  hit->SetWorldPos(worldPos);
  hit->SetLocalPos(localPos);
  hit->SetTime(preStepPoint->GetGlobalTime());
 
  fHitsCollection->insert(hit);
 
  return true;
}
 
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}