/afs/cern.ch/work/a/aaltunda/public/www/CMSSW_6_2_5/src/SimG4CMS/ShowerLibraryProducer/src/HcalForwardAnalysis.cc

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// system include files
#include <cmath>
#include <iostream>
#include <iomanip>

// user include files
#include "SimG4CMS/ShowerLibraryProducer/interface/HcalForwardAnalysis.h"

#include "SimG4Core/Notification/interface/BeginOfRun.h"
#include "SimG4Core/Notification/interface/BeginOfEvent.h"
#include "SimG4Core/Notification/interface/EndOfEvent.h"

#include "DataFormats/Math/interface/Point3D.h"

#include "FWCore/Framework/interface/Event.h"
#include "FWCore/Framework/interface/EventSetup.h"
#include "FWCore/Framework/interface/ESHandle.h"
#include "FWCore/MessageLogger/interface/MessageLogger.h"
#include "FWCore/ParameterSet/interface/ParameterSet.h"

#include "G4SDManager.hh"
#include "G4VProcess.hh"
#include "G4HCofThisEvent.hh"
#include "CLHEP/Units/GlobalSystemOfUnits.h"
#include "CLHEP/Units/GlobalPhysicalConstants.h"

HcalForwardAnalysis::HcalForwardAnalysis(const edm::ParameterSet &p) {

  edm::ParameterSet m_SLP = p.getParameter<edm::ParameterSet> ("HFShowerLibraryProducer");
  theNames = m_SLP.getParameter<std::vector<std::string> > ("Names");
  //LibVer = m_HS.getParameter<std::string> ("LibVer");
  //produces<HFShowerPhotonCollection> ();
  init();
  theEventCounter = 0;
  nphot = 0;
  for (int i = 0; i < 10000; ++i) {
    x[i] = 0.;
    y[i] = 0.;
    z[i] = 0.;
    t[i] = 0.;
    lambda[i] = 0.;
    fiberId[i] = 0;
  }
  primX = primY = primZ = primT = 0.;
  primMomX = primMomY = primMomZ = 0.;

}

HcalForwardAnalysis::~HcalForwardAnalysis() {
}

//
// member functions
//

void HcalForwardAnalysis::produce(edm::Event& iEvent, const edm::EventSetup&) {

        //std::auto_ptr<HFShowerPhotonCollection> product(new HFShowerPhotonCollection);
        //edm::LogInfo("HcalForwardLib") << "HcalForwardAnalysis: =====> Filling  event";
        //fillEvent(*product);
        //iEvent.put(product);
        //std::auto_ptr<PHcalForwardLibInfo> product(new PHcalForwardLibInfo);
        //fillEvent(*product);
        fillEvent();
        //iEvent.put(product);
}

void HcalForwardAnalysis::init() {

        theTree = theFile->make<TTree> ("CherenkovPhotons", "Cherenkov Photons");
        theTree->Branch("nphot", &nphot, "nphot/I");
        theTree->Branch("x", &x, "x[nphot]/F");
        theTree->Branch("y", &y, "y[nphot]/F");
        theTree->Branch("z", &z, "z[nphot]/F");
        theTree->Branch("t", &t, "t[nphot]/F");
        theTree->Branch("lambda", &lambda, "lambda[nphot]/F");
        theTree->Branch("fiberId", &fiberId, "fiberId[nphot]/I");
        theTree->Branch("primX", &primX, "primX/F");
        theTree->Branch("primY", &primY, "primY/F");
        theTree->Branch("primZ", &primZ, "primZ/F");
        theTree->Branch("primMomX", &primMomX, "primMomX/F");
        theTree->Branch("primMomY", &primMomY, "primMomY/F");
        theTree->Branch("primMomZ", &primMomZ, "primMomZ/F");
        theTree->Branch("primT", &primT, "primT/F");

        // counter
        count = 0;
        evNum = 0;
        clear();
}

void HcalForwardAnalysis::update(const BeginOfRun * run) {

        int irun = (*run)()->GetRunID();
        edm::LogInfo("HcalForwardLib") << " =====> Begin of Run = " << irun;

}

void HcalForwardAnalysis::update(const BeginOfEvent * evt) {

        evNum = (*evt)()->GetEventID();
        clear();
        edm::LogInfo("HcalForwardLib") << "HcalForwardAnalysis: =====> Begin of event = " << evNum;
}

void HcalForwardAnalysis::update(const G4Step * aStep) {
}

void HcalForwardAnalysis::update(const EndOfEvent * evt) {

        count++;

        //fill the buffer
        LogDebug("HcalForwardLib")<< "HcalForwardAnalysis::Fill event "
        << (*evt)()->GetEventID();
        setPhotons(evt);

        int iEvt = (*evt)()->GetEventID();
        if (iEvt < 10)
        edm::LogInfo("HcalForwardLib") << "HcalForwardAnalysis:: Event " << iEvt;
        else if ((iEvt < 100) && (iEvt%10 == 0))
        edm::LogInfo("HcalForwardLib") << "HcalForwardAnalysis:: Event " << iEvt;
        else if ((iEvt < 1000) && (iEvt%100 == 0))
        edm::LogInfo("HcalForwardLib") << "HcalForwardAnalysis:: Event " << iEvt;
        else if ((iEvt < 10000) && (iEvt%1000 == 0))
        edm::LogInfo("HcalForwardLib") << "HcalForwardAnalysis:: Event " << iEvt;
}

void HcalForwardAnalysis::setPhotons(const EndOfEvent * evt) {

        int idHC, j;
        FiberG4HitsCollection* theHC;
        // Look for the Hit Collection of HCal
        G4HCofThisEvent* allHC = (*evt)()->GetHCofThisEvent();
        std::string sdName = theNames[0];//name for fiber hits
        idHC = G4SDManager::GetSDMpointer()->GetCollectionID(sdName);
        theHC = (FiberG4HitsCollection*) allHC->GetHC(idHC);
        LogDebug("HcalForwardLib")<< "HcalForwardAnalysis::setPhotons() Hit Collection for " << sdName
        << " of ID " << idHC << " is obtained at " << theHC;
        std::vector<HFShowerPhoton> ShortFiberPhotons;
        std::vector<HFShowerPhoton> LongFiberPhotons;
        LongFiberPhotons.clear();
        ShortFiberPhotons.clear();
        if (idHC >= 0 && theHC> 0) {
                std::cout << "FiberhitSize " << theHC->entries() << std::endl;
                for (j = 0; j < theHC->entries(); j++) {
                        FiberG4Hit* aHit = (*theHC)[j];
                        std::vector<HFShowerPhoton> thePhotonsFromHit = aHit->photon();
                        std::cout << "Fiberhit " << j << " has " << thePhotonsFromHit.size() << " photons." << std::endl;
                        int fTowerId = -1;
                        int fCellId = -1;
                        int fFiberId = -1;
                        parseDetId(aHit->towerId(), fTowerId, fCellId, fFiberId);
                        for(unsigned int iph = 0; iph < thePhotonsFromHit.size(); ++iph){
                            if(aHit->depth() == 1)LongFiberPhotons.push_back(thePhotonsFromHit[iph]);
                            if(aHit->depth() == 2)ShortFiberPhotons.push_back(thePhotonsFromHit[iph]);
                        }
                        LogDebug("HcalForwardLib") << "HcalForwardAnalysis::setPhotons() NbPhotons " << thePhotonsFromHit.size()
                        << " towerId " << fTowerId << " cellId " << fCellId << " fiberId " << fFiberId << " depth " << aHit->depth();
                }
        }else{
                LogDebug("HcalForwardLib") << "HcalForwardAnalysis::setPhotons(): No Photons!";
                return;
        }
        LogDebug("HcalForwardLib") << "HcalForwardAnalysis::setPhotons() LongFibPhotons: "
           << LongFiberPhotons.size() << " ShortFibPhotons: " << ShortFiberPhotons.size();
        std::cout << "HcalForwardAnalysis::setPhotons() LongFibPhotons: "
                   << LongFiberPhotons.size() << " ShortFibPhotons: " << ShortFiberPhotons.size() << std::endl;

        //Chamber hits to find information about primary particle on surface
        HFShowerG4HitsCollection* theChamberHC;
        G4HCofThisEvent* allChamberHC = (*evt)()->GetHCofThisEvent();
        sdName= theNames[1];
        idHC = G4SDManager::GetSDMpointer()->GetCollectionID(sdName);
        theChamberHC = (HFShowerG4HitsCollection*) allChamberHC->GetHC(idHC);
        math::XYZPoint primPosOnSurf(0,0,0);
        math::XYZPoint primMomDirOnSurf(0,0,0);
        float primTimeOnSurf = 0;
        //      the chamber hit is for primary particle, but step size can be small
        //      (in newer Geant4 versions) and as a result primary particle may have
        //      multiple hits. We want to take last one which is close the HF absorber
        if(idHC >= 0 && theChamberHC> 0) {
                LogDebug("HcalForwardLib") << "HcalForwardAnalysis::setPhotons() Chamber Hits size: " << theChamberHC->entries();
                for(j = 0; j < theChamberHC->entries();++j) {
                        HFShowerG4Hit* aHit = (*theChamberHC)[j];
                        LogDebug("HcalForwardLib") << "HcalForwardAnalysis::setPhotons() Chamber Hit id " << aHit->hitId()
                        << " track id " << aHit->trackId() << " prim. pos. " << aHit->globalPosition() << " prom mom. dir. "
                        << aHit->primaryMomDir() << " time " << aHit->time();
                        primPosOnSurf.SetXYZ(aHit->globalPosition().x(), aHit->globalPosition().y(), aHit->globalPosition().z());
                        primMomDirOnSurf.SetXYZ(aHit->primaryMomDir().x(), aHit->primaryMomDir().y(), aHit->primaryMomDir().z());
                        primTimeOnSurf = aHit->time();
                }
        }else{
                LogDebug("HcalForwardLib") << "HcalForwardAnalysis::setPhotons(): No Chamber hits. Something is wrong!";
                return;
        }
        primX = primPosOnSurf.x();
        primY = primPosOnSurf.y();
        primZ = primPosOnSurf.z();
        primT = primTimeOnSurf;
        primMomX = primMomDirOnSurf.x();
        primMomY = primMomDirOnSurf.y();
        primMomZ = primMomDirOnSurf.z();
        //production point of Cherenkov photons in long fibers w.r.t local coordinates
        float photonProdX = 0.;
        float photonProdY = 0.;
        float photonProdZ = 0.;
        float photonProdTime = 0.;
  //angles for rotation matrices
  double theta = primMomDirOnSurf.theta();
  double phi = primMomDirOnSurf.phi();

        for(unsigned int k = 0; k < LongFiberPhotons.size(); ++k){
                HFShowerPhoton aPhoton =  LongFiberPhotons[k];
                photonProdX =  aPhoton.x()*cos(theta)*cos(phi) + aPhoton.y()*cos(theta)*sin(phi) - aPhoton.z()*sin(theta) - primPosOnSurf.x();
                photonProdY =  -aPhoton.x()*sin(phi) + aPhoton.y()*cos(phi) - primPosOnSurf.y();
                photonProdZ = aPhoton.x()*sin(theta)*cos(phi) + aPhoton.y()*sin(theta)*sin(phi) + aPhoton.z()*cos(theta) - primPosOnSurf.z();
                photonProdTime = aPhoton.t()- primTimeOnSurf;
                thePhotons.push_back(Photon(1, photonProdX, photonProdY, photonProdZ, photonProdTime, aPhoton.lambda()));
        }
        for(unsigned int k = 0; k < ShortFiberPhotons.size(); ++k){
                        HFShowerPhoton aPhoton =  ShortFiberPhotons[k];
                        photonProdX =  aPhoton.x()*cos(theta)*cos(phi) + aPhoton.y()*cos(theta)*sin(phi) - aPhoton.z()*sin(theta) - primPosOnSurf.x();
                        photonProdY =  -aPhoton.x()*sin(phi) + aPhoton.y()*cos(phi) - primPosOnSurf.y();
                        photonProdZ = aPhoton.x()*sin(theta)*cos(phi) + aPhoton.y()*sin(theta)*sin(phi) + aPhoton.z()*cos(theta) - primPosOnSurf.z();
                        photonProdTime = aPhoton.t()- primTimeOnSurf;
                        thePhotons.push_back(Photon(2, photonProdX, photonProdY, photonProdZ, photonProdTime, aPhoton.lambda()));
        }
}
void HcalForwardAnalysis::fillEvent() {
        /*
         edm::LogInfo("HcalForwardLib") << "HcalForwardAnalysis: =====> filledEvent";
         */
        nphot = int(thePhotons.size());
        for (int i = 0; i < nphot; ++i) {
                x[i] = thePhotons[i].x;
                y[i] = thePhotons[i].y;
                z[i] = thePhotons[i].z;
                t[i] = thePhotons[i].t;
                lambda[i] = thePhotons[i].lambda;
                fiberId[i] = thePhotons[i].fiberId;
        }
        theTree->Fill();
}
void HcalForwardAnalysis::parseDetId(int id, int& tower, int& cell, int& fiber) {
        tower = id / 10000;
        cell = id / 10 - tower * 10;
        fiber = id - tower * 10000 - cell * 10;
}

void HcalForwardAnalysis::clear() {
        nphot = 0;
        for (int i = 0; i < 10000; ++i) {
                x[i] = 0.;
                y[i] = 0.;
                z[i] = 0.;
                t[i] = 0.;
                lambda[i] = 0.;
                fiberId[i] = 0;
        }
        primX = primY = primZ = primT = 0.;
        primMomX = primMomY = primMomZ = 0.;

        thePhotons.clear();
}