/afs/cern.ch/work/a/aaltunda/public/www/CMSSW_6_2_7/src/Calibration/IsolatedParticles/src/FindDistCone.cc

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#include "Calibration/IsolatedParticles/interface/FindDistCone.h"

#include <iostream>

namespace spr {

  // Cone clustering core
  double getDistInPlaneTrackDir(const GlobalPoint&  caloPoint, const GlobalVector& caloVector, const GlobalPoint&  rechitPoint) {
  
    const GlobalVector caloIntersectVector(caloPoint.x(), 
                                           caloPoint.y(), 
                                           caloPoint.z()); //p

    const GlobalVector caloUnitVector = caloVector.unit();
    const GlobalVector rechitVector(rechitPoint.x(),
                                    rechitPoint.y(),
                                    rechitPoint.z());
    const GlobalVector rechitUnitVector = rechitVector.unit();
    double dotprod_denominator = caloUnitVector.dot(rechitUnitVector);
    double dotprod_numerator   = caloUnitVector.dot(caloIntersectVector);
    double rechitdist = dotprod_numerator/dotprod_denominator;
    const GlobalVector effectiveRechitVector = rechitdist*rechitUnitVector;
    const GlobalPoint effectiveRechitPoint(effectiveRechitVector.x(),
                                           effectiveRechitVector.y(),
                                           effectiveRechitVector.z());
    GlobalVector distance_vector = effectiveRechitPoint-caloPoint;
    if (dotprod_denominator > 0. && dotprod_numerator > 0.) {
      return distance_vector.mag();
    } else {
      return 999999.;
    }
  }

  // Not used, but here for reference
  double getDistInCMatEcal(double eta1, double phi1, double eta2, double phi2){

    double dR, Rec;
    if (fabs(eta1)<1.479) Rec=129;
    else Rec=317;
    double ce1=cosh(eta1);
    double ce2=cosh(eta2);
    double te1=tanh(eta1);
    double te2=tanh(eta2);
  
    double z=cos(phi1-phi2)/ce1/ce2+te1*te2;
    if(z!=0) dR=fabs(Rec*ce1*sqrt(1./z/z-1.));
    else     dR=999999.;
    return dR;
  }


  // Not used, but here for reference
  double getDistInCMatHcal(double eta1, double phi1, double eta2, double phi2){

    // Radii and eta from Geometry/HcalCommonData/data/hcalendcapalgo.xml
    // and Geometry/HcalCommonData/data/hcalbarrelalgo.xml

    double dR, Rec;
    if (fabs(eta1)<1.392) Rec=177.5; 
    else Rec=391.95;
    double ce1=cosh(eta1);
    double ce2=cosh(eta2);
    double te1=tanh(eta1);
    double te2=tanh(eta2);
  
    double z=cos(phi1-phi2)/ce1/ce2+te1*te2;
    if(z!=0) dR=fabs(Rec*ce1*sqrt(1./z/z-1.));
    else     dR=999999.;
    return dR;
  }

  void getEtaPhi(HBHERecHitCollection::const_iterator hit, std::vector<int>& RH_ieta, std::vector<int>& RH_iphi, std::vector<double>& RH_ene) {

    RH_ieta.push_back(hit->id().ieta());
    RH_iphi.push_back(hit->id().iphi());
    RH_ene.push_back(hit->energy());
  }

  void getEtaPhi(edm::PCaloHitContainer::const_iterator hit, std::vector<int>& RH_ieta, std::vector<int>& RH_iphi, std::vector<double>& RH_ene)  {
    // SimHit function not yet implemented.
    RH_ieta.push_back(-9);
    RH_iphi.push_back(-9);
    RH_ene.push_back(-9.);
  }

  void getEtaPhi(EcalRecHitCollection::const_iterator hit, std::vector<int>& RH_ieta, std::vector<int>& RH_iphi, std::vector<double>& RH_ene) {
    // Ecal function not yet implemented.
    RH_ieta.push_back(-9);
    RH_iphi.push_back(-9);
    RH_ene.push_back(-9.);
  }

  void getEtaPhi(HBHERecHitCollection::const_iterator hit,int& ieta,int& iphi){
    ieta = hit->id().ieta();
    iphi = hit->id().iphi();
  }

  void getEtaPhi(edm::PCaloHitContainer::const_iterator hit,int& ieta,int& iphi){
    DetId id = DetId(hit->id());
    if (id.det() == DetId::Hcal) {
      ieta = ((HcalDetId)(hit->id())).ieta();
      iphi = ((HcalDetId)(hit->id())).iphi();
    } else if (id.det() == DetId::Ecal && id.subdetId() == EcalBarrel) {
      ieta = ((EBDetId)(id)).ieta();
      iphi = ((EBDetId)(id)).iphi();
    } else {
      ieta = 999;
      iphi = 999;
    }
  }

  void getEtaPhi(EcalRecHitCollection::const_iterator hit,int& ieta,int& iphi){
    DetId id = hit->id();
    if (id.subdetId() == EcalBarrel) {
      ieta = ((EBDetId)(id)).ieta();
      iphi = ((EBDetId)(id)).iphi();
    } else {
      ieta = 999;
      iphi = 999;
    }
  }

  double getEnergy(HBHERecHitCollection::const_iterator hit) {
    return hit->energy();
  }

  double getEnergy(EcalRecHitCollection::const_iterator hit) {
    return hit->energy();
  }
  
  double getEnergy(edm::PCaloHitContainer::const_iterator hit) {
    // This will not yet handle Ecal CaloHits!!
    double samplingWeight = 1.;
    // Hard coded sampling weights from JFH analysis of iso tracks
    // Sept 2009.
    HcalDetId detId(hit->id());
    if (detId.subdet() == HcalBarrel)
      samplingWeight = 114.1;
    else if (detId.subdet() == HcalEndcap) 
      samplingWeight = 167.3;
    else {
      // ONLY protection against summing HO, HF simhits
      return 0.;
    }
    
    return samplingWeight*hit->energy();
  }

  GlobalPoint getGpos(const CaloGeometry* geo,HBHERecHitCollection::const_iterator hit) {
    DetId detId(hit->id());
    return geo->getPosition(detId);
  }

  GlobalPoint getGpos(const CaloGeometry* geo,edm::PCaloHitContainer::const_iterator hit) {
    DetId detId(hit->id());
    return geo->getPosition(detId);
  }

  GlobalPoint getGpos(const CaloGeometry* geo, EcalRecHitCollection::const_iterator hit) {
    // Not tested for EcalRecHits!!
    if (hit->id().subdetId() == EcalEndcap) {
      EEDetId EEid = EEDetId(hit->id());
      return geo->getPosition(EEid);
    } else { // (hit->id().subdetId() == EcalBarrel)
      EBDetId EBid = EBDetId(hit->id());
      return geo->getPosition(EBid);
    }
  }
}