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// $Id: A01DriftChamber.cc,v 1.6 2006/06/29 16:32:26 gunter Exp $
// --------------------------------------------------------------
//
#include "A01DriftChamber.hh"
#include "A01DriftChamberHit.hh"
#include "G4HCofThisEvent.hh"
#include "G4TouchableHistory.hh"
#include "G4Track.hh"
#include "G4Step.hh"
#include "G4SDManager.hh"
#include "G4Navigator.hh"
#include "G4ios.hh"

A01DriftChamber::A01DriftChamber(G4String name)
:G4VSensitiveDetector(name)
{
  G4String HCname;
  collectionName.insert(HCname="driftChamberColl");
  HCID = -1;
}

A01DriftChamber::~A01DriftChamber(){;}

void A01DriftChamber::Initialize(G4HCofThisEvent*HCE)
{
  hitsCollection = new A01DriftChamberHitsCollection
                   (SensitiveDetectorName,collectionName[0]);
  if(HCID<0)
  { HCID = G4SDManager::GetSDMpointer()->GetCollectionID(hitsCollection); }
  HCE->AddHitsCollection(HCID,hitsCollection);
}

G4bool A01DriftChamber::ProcessHits(G4Step*aStep,G4TouchableHistory* /*ROhist*/)
{
  G4double charge = aStep->GetTrack()->GetDefinition()->GetPDGCharge();
  if(charge==0.) return true;

  G4StepPoint* preStepPoint = aStep->GetPreStepPoint();
  G4TouchableHistory* theTouchable
    = (G4TouchableHistory*)(preStepPoint->GetTouchable());
  G4VPhysicalVolume* theMotherPhysical = theTouchable->GetVolume(1); // mother
  G4int copyNo = theMotherPhysical->GetCopyNo();
  G4ThreeVector worldPos = preStepPoint->GetPosition();
  G4ThreeVector localPos
    = theTouchable->GetHistory()->GetTopTransform().TransformPoint(worldPos);

  A01DriftChamberHit* aHit = new A01DriftChamberHit(copyNo);
  aHit->SetWorldPos(worldPos);
  aHit->SetLocalPos(localPos);
  aHit->SetTime(preStepPoint->GetGlobalTime());

  hitsCollection->insert(aHit);

  return true;
}

void A01DriftChamber::EndOfEvent(G4HCofThisEvent* /*HCE*/)
{;}