PHG4ConeSteppingAction.cc

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#include "PHG4ConeSteppingAction.h"
#include "PHG4ConeDetector.h"

#include <g4main/PHG4Hit.h>
#include <g4main/PHG4HitContainer.h>
#include <g4main/PHG4Hitv1.h>
#include <g4main/PHG4Shower.h>
#include <g4main/PHG4SteppingAction.h>  // for PHG4SteppingAction
#include <g4main/PHG4TrackUserInfoV1.h>

#include <phool/getClass.h>

#include <Geant4/G4ParticleDefinition.hh>  // for G4ParticleDefinition
#include <Geant4/G4Step.hh>
#include <Geant4/G4StepPoint.hh>              // for G4StepPoint
#include <Geant4/G4StepStatus.hh>             // for fGeomBoundary, fUndefined
#include <Geant4/G4String.hh>                 // for G4String
#include <Geant4/G4SystemOfUnits.hh>          // for cm, nanosecond, GeV
#include <Geant4/G4ThreeVector.hh>            // for G4ThreeVector
#include <Geant4/G4TouchableHandle.hh>        // for G4TouchableHandle
#include <Geant4/G4Track.hh>                  // for G4Track
#include <Geant4/G4TrackStatus.hh>            // for fStopAndKill
#include <Geant4/G4Types.hh>                  // for G4double
#include <Geant4/G4VTouchable.hh>             // for G4VTouchable
#include <Geant4/G4VUserTrackInformation.hh>  // for G4VUserTrackInformation

#include <iostream>
#include <string>  // for string, operator+, oper...

class G4VPhysicalVolume;
class PHCompositeNode;

using namespace std;
//____________________________________________________________________________..
PHG4ConeSteppingAction::PHG4ConeSteppingAction(PHG4ConeDetector* detector)
  : PHG4SteppingAction(detector->GetName())
  , detector_(detector)
  , hits_(nullptr)
  , hit(nullptr)
  , saveshower(nullptr)
{
}

PHG4ConeSteppingAction::~PHG4ConeSteppingAction()
{
  // if the last hit was a zero energie deposit hit, it is just reset
  // and the memory is still allocated, so we need to delete it here
  // if the last hit was saved, hit is a nullptr pointer which are
  // legal to delete (it results in a no operation)
  delete hit;
}

//____________________________________________________________________________..
bool PHG4ConeSteppingAction::UserSteppingAction(const G4Step* aStep, bool)
{
  // get volume of the current step
  G4VPhysicalVolume* volume = aStep->GetPreStepPoint()->GetTouchableHandle()->GetVolume();

  // collect energy and track length step by step
  G4double edep = aStep->GetTotalEnergyDeposit() / GeV;

  const G4Track* aTrack = aStep->GetTrack();

  int layer_id = detector_->get_Layer();
  // make sure we are in a volume
  if (detector_->IsInConeActive(volume))
  {
    bool geantino = false;
    // the check for the pdg code speeds things up, I do not want to make
    // an expensive string compare for every track when we know
    // geantino or chargedgeantino has pid=0
    if (aTrack->GetParticleDefinition()->GetPDGEncoding() == 0 &&
        aTrack->GetParticleDefinition()->GetParticleName().find("geantino") != string::npos)
    {
      geantino = true;
    }
    G4StepPoint* prePoint = aStep->GetPreStepPoint();
    G4StepPoint* postPoint = aStep->GetPostStepPoint();
    //       cout << "track id " << aTrack->GetTrackID() << endl;
    //       cout << "time prepoint: " << prePoint->GetGlobalTime() << endl;
    //       cout << "time postpoint: " << postPoint->GetGlobalTime() << endl;
    switch (prePoint->GetStepStatus())
    {
    case fGeomBoundary:
    case fUndefined:
      if (!hit)
      {
        hit = new PHG4Hitv1();
      }
      //here we set the entrance values in cm
      hit->set_x(0, prePoint->GetPosition().x() / cm);
      hit->set_y(0, prePoint->GetPosition().y() / cm);
      hit->set_z(0, prePoint->GetPosition().z() / cm);
      // time in ns
      hit->set_t(0, prePoint->GetGlobalTime() / nanosecond);
      //set the track ID
      hit->set_trkid(aTrack->GetTrackID());
      //set the initial energy deposit
      hit->set_edep(0);

      if (G4VUserTrackInformation* p = aTrack->GetUserInformation())
      {
        if (PHG4TrackUserInfoV1* pp = dynamic_cast<PHG4TrackUserInfoV1*>(p))
        {
          hit->set_trkid(pp->GetUserTrackId());
          hit->set_shower_id(pp->GetShower()->get_id());
          saveshower = pp->GetShower();
        }
      }

      break;
    default:
      break;
    }
    // here we just update the exit values, it will be overwritten
    // for every step until we leave the volume or the particle
    // ceases to exist
    hit->set_x(1, postPoint->GetPosition().x() / cm);
    hit->set_y(1, postPoint->GetPosition().y() / cm);
    hit->set_z(1, postPoint->GetPosition().z() / cm);

    hit->set_t(1, postPoint->GetGlobalTime() / nanosecond);
    //sum up the energy to get total deposited
    hit->set_edep(hit->get_edep() + edep);
    if (geantino)
    {
      hit->set_edep(-1);  // only energy=0 g4hits get dropped, this way geantinos survive the g4hit compression
    }
    if (edep > 0)
    {
      if (G4VUserTrackInformation* p = aTrack->GetUserInformation())
      {
        if (PHG4TrackUserInfoV1* pp = dynamic_cast<PHG4TrackUserInfoV1*>(p))
        {
          pp->SetKeep(1);  // we want to keep the track
        }
      }
    }

    // if any of these conditions is true this is the last step in
    // this volume and we need to save the hit
    // postPoint->GetStepStatus() == fGeomBoundary: track leaves this volume
    // postPoint->GetStepStatus() == fWorldBoundary: track leaves this world
    // (not sure if this will ever be the case)
    // aTrack->GetTrackStatus() == fStopAndKill: track ends
    if (postPoint->GetStepStatus() == fGeomBoundary || postPoint->GetStepStatus() == fWorldBoundary || aTrack->GetTrackStatus() == fStopAndKill)
    {
      // save only hits with energy deposit (or -1 for geantino)
      if (hit->get_edep())
      {
        hits_->AddHit(layer_id, hit);
        if (saveshower)
        {
          saveshower->add_g4hit_id(hits_->GetID(), hit->get_hit_id());
        }
        // ownership has been transferred to container, set to null
        // so we will create a new hit for the next track
        hit = nullptr;
      }
      else
      {
        // if this hit has no energy deposit, just reset it for reuse
        // this means we have to delete it in the dtor. If this was
        // the last hit we processed the memory is still allocated
        hit->Reset();
      }
    }
    // return true to indicate the hit was used
    return true;
  }
  else
  {
    return false;
  }
}

//____________________________________________________________________________..
void PHG4ConeSteppingAction::SetInterfacePointers(PHCompositeNode* topNode)
{
  string hitnodename;
  if (detector_->SuperDetector() != "NONE")
  {
    hitnodename = "G4HIT_" + detector_->SuperDetector();
  }
  else
  {
    hitnodename = "G4HIT_" + detector_->GetName();
  }

  //now look for the map and grab a pointer to it.
  hits_ = findNode::getClass<PHG4HitContainer>(topNode, hitnodename.c_str());

  // if we do not find the node we need to scream.
  if (!hits_)
  {
    std::cout << "PHG4ConeSteppingAction::SetTopNode - unable to find " << hitnodename << std::endl;
  }
}