#include <KDTreeLinkerTrackEcal.h>

Inheritance diagram for KDTreeLinkerTrackEcal:

Public Member Functions
void	buildTree ()

void	clear ()

void	insertFieldClusterElt (reco::PFBlockElement *ecalCluster)

void	insertTargetElt (reco::PFBlockElement *track)

	KDTreeLinkerTrackEcal ()

void	searchLinks ()

void	updatePFBlockEltWithLinks ()

	~KDTreeLinkerTrackEcal ()

Public Member Functions inherited from KDTreeLinkerBase
float	getCristalPhiEtaMaxSize () const

float	getCristalXYMaxSize () const

float	getPhiOffset () const

	KDTreeLinkerBase ()

virtual void	process ()

void	setCristalPhiEtaMaxSize (float size)

void	setCristalXYMaxSize (float size)

void	setDebug (bool isDebug)

void	setPhiOffset (double phiOffset)

virtual	~KDTreeLinkerBase ()

Private Attributes
BlockEltSet	fieldClusterSet_

RecHit2BlockEltMap	rechit2ClusterLinks_

RecHitSet	rechitsSet_

BlockElt2BlockEltMap	target2ClusterLinks_

BlockEltSet	targetSet_

KDTreeLinkerAlgo	tree_

Additional Inherited Members
Protected Attributes inherited from KDTreeLinkerBase
float	cristalPhiEtaMaxSize_

float	cristalXYMaxSize_

bool	debug_

float	phiOffset_

Detailed Description

Definition at line 12 of file KDTreeLinkerTrackEcal.h.

Constructor & Destructor Documentation

KDTreeLinkerTrackEcal::KDTreeLinkerTrackEcal ( )

Definition at line 6 of file KDTreeLinkerTrackEcal.cc.

7 : KDTreeLinkerBase()

8 {}

KDTreeLinkerBase::KDTreeLinkerBase

KDTreeLinkerBase()

Definition: KDTreeLinkerBase.cc:3

KDTreeLinkerTrackEcal::~KDTreeLinkerTrackEcal ( )

Definition at line 10 of file KDTreeLinkerTrackEcal.cc.

References clear().

 {
   clear();
 }

Member Function Documentation

void KDTreeLinkerTrackEcal::buildTree ( )

virtual

Implements KDTreeLinkerBase.

Definition at line 54 of file KDTreeLinkerTrackEcal.cc.

References KDTreeLinkerAlgo< DATA >::build(), KDTreeLinkerBase::getPhiOffset(), M_PI, phi, phimax, phimin, rechitsSet_, and tree_.

 {
   // List of pseudo-rechits that will be used to create the KDTree
   std::vector<KDTreeNodeInfo> eltList;
 
   // Filling of this list
   for(RecHitSet::const_iterator it = rechitsSet_.begin(); 
       it != rechitsSet_.end(); it++) {
     
     const reco::PFRecHit::REPPoint &posrep = (*it)->positionREP();
     
     KDTreeNodeInfo rh1 (*it, posrep.Eta(), posrep.Phi());
     eltList.push_back(rh1);
     
     // Here we solve the problem of phi circular set by duplicating some rechits
     // too close to -Pi (or to Pi) and adding (substracting) to them 2 * Pi.
     if (rh1.dim2 > (M_PI - getPhiOffset())) {
       double phi = rh1.dim2 - 2 * M_PI;
       KDTreeNodeInfo rh2(*it, posrep.Eta(), phi); 
       eltList.push_back(rh2);
     }
 
     if (rh1.dim2 < (M_PI * -1.0 + getPhiOffset())) {
       double phi = rh1.dim2 + 2 * M_PI;
       KDTreeNodeInfo rh3(*it, posrep.Eta(), phi); 
       eltList.push_back(rh3);
     }
   }
 
   // Here we define the upper/lower bounds of the 2D space (eta/phi).
   double phimin = -1.0 * M_PI - getPhiOffset();
   double phimax = M_PI + getPhiOffset();
 
   // etamin-etamax, phimin-phimax
   KDTreeBox region(-3.0, 3.0, phimin, phimax);
 
   // We may now build the KDTree
   tree_.build(eltList, region);
 }

void KDTreeLinkerTrackEcal::clear ( void )

virtual

Implements KDTreeLinkerBase.

Definition at line 230 of file KDTreeLinkerTrackEcal.cc.

References KDTreeLinkerAlgo< DATA >::clear(), fieldClusterSet_, rechit2ClusterLinks_, rechitsSet_, target2ClusterLinks_, targetSet_, and tree_.

Referenced by ~KDTreeLinkerTrackEcal().

 {
   targetSet_.clear();
   fieldClusterSet_.clear();
 
   rechitsSet_.clear();
 
   rechit2ClusterLinks_.clear();
   target2ClusterLinks_.clear();
 
   tree_.clear();
 }

void KDTreeLinkerTrackEcal::insertFieldClusterElt ( reco::PFBlockElement * ecalCluster )

virtual

Implements KDTreeLinkerBase.

Definition at line 23 of file KDTreeLinkerTrackEcal.cc.

References reco::PFBlockElement::clusterRef(), fieldClusterSet_, funct::fract(), edm::Ref< C, T, F >::isNull(), rechit2ClusterLinks_, and rechitsSet_.

Referenced by PFBlockAlgo::setInput().

 {
   reco::PFClusterRef clusterref = ecalCluster->clusterRef();
 
   // This test is more or less done in PFBlockAlgo.h. In others cases, it should be switch on.
   //   if (!((clusterref->layer() == PFLayer::ECAL_ENDCAP) ||
   //    (clusterref->layer() == PFLayer::ECAL_BARREL)))
   //     return;
 
   const std::vector<reco::PFRecHitFraction> &fraction = clusterref->recHitFractions();
 
   // We create a list of ecalCluster
   fieldClusterSet_.insert(ecalCluster);
   for(size_t rhit = 0; rhit < fraction.size(); ++rhit) {
     const reco::PFRecHitRef& rh = fraction[rhit].recHitRef();
     double fract = fraction[rhit].fraction();
 
     if ((rh.isNull()) || (fract < 1E-4))
       continue;
       
     const reco::PFRecHit& rechit = *rh;
       
     // We save the links rechit to EcalClusters
     rechit2ClusterLinks_[&rechit].insert(ecalCluster);
     
     // We create a liste of rechits
     rechitsSet_.insert(&rechit);
   }
 }

void KDTreeLinkerTrackEcal::insertTargetElt ( reco::PFBlockElement * track )

virtual

Implements KDTreeLinkerBase.

Definition at line 16 of file KDTreeLinkerTrackEcal.cc.

References targetSet_.

Referenced by PFBlockAlgo::setInput().

 {
   targetSet_.insert(track);
 }

void KDTreeLinkerTrackEcal::searchLinks ( )

virtual

Implements KDTreeLinkerBase.

Definition at line 95 of file KDTreeLinkerTrackEcal.cc.

References reco::PFTrajectoryPoint::ClosestApproach, PFLayer::ECAL_BARREL, reco::PFTrajectoryPoint::ECALShowerMax, reco::tau::disc::Eta(), KDTreeLinkerBase::getCristalPhiEtaMaxSize(), reco::PFTrajectoryPoint::isValid(), M_PI, bookConverter::min, reco::PFTrajectoryPoint::momentum(), colinearityKinematic::Phi, reco::PFTrajectoryPoint::position(), reco::PFTrajectoryPoint::positionREP(), rechit2ClusterLinks_, run_regression::ret, KDTreeLinkerAlgo< DATA >::search(), mathSSE::sqrt(), target2ClusterLinks_, targetSet_, listHistos::trackPt, tree_, x, and detailsBasic3DVector::y.

 {
   // Must of the code has been taken from LinkByRecHit.cc
 
   // We iterate over the tracks.
   for(BlockEltSet::iterator it = targetSet_.begin(); 
       it != targetSet_.end(); it++) {
     
     reco::PFRecTrackRef trackref = (*it)->trackRefPF();
 
     // We set the multilinks flag of the track to true. It will allow us to 
     // use in an optimized way our algo results in the recursive linking algo.
     (*it)->setIsValidMultilinks(true);
 
     const reco::PFTrajectoryPoint& atECAL = 
       trackref->extrapolatedPoint(reco::PFTrajectoryPoint::ECALShowerMax);
 
     // The track didn't reach ecal
     if( ! atECAL.isValid() ) continue;
     
     const reco::PFTrajectoryPoint& atVertex = 
       trackref->extrapolatedPoint( reco::PFTrajectoryPoint::ClosestApproach );
     
     double trackPt = sqrt(atVertex.momentum().Vect().Perp2());
     double tracketa = atECAL.positionREP().Eta();
     double trackphi = atECAL.positionREP().Phi();
     double trackx = atECAL.position().X();
     double tracky = atECAL.position().Y();
     double trackz = atECAL.position().Z();
     
     // Estimate the maximal envelope in phi/eta that will be used to find rechit candidates.
     // Same envelope for cap et barrel rechits.
     double range = getCristalPhiEtaMaxSize() * (2.0 + 1.0 / std::min(1., trackPt / 2.)); 
 
     // We search for all candidate recHits, ie all recHits contained in the maximal size envelope.
     std::vector<KDTreeNodeInfo> recHits;
     KDTreeBox trackBox(tracketa-range, tracketa+range, trackphi-range, trackphi+range);
     tree_.search(trackBox, recHits);
     
     // Here we check all rechit candidates using the non-approximated method.
     for(std::vector<KDTreeNodeInfo>::const_iterator rhit = recHits.begin(); 
     rhit != recHits.end(); ++rhit) {
            
       const std::vector< math::XYZPoint >& cornersxyz      = rhit->ptr->getCornersXYZ();
       const math::XYZPoint& posxyz             = rhit->ptr->position();
       const reco::PFRecHit::REPPoint &rhrep        = rhit->ptr->positionREP();
       const std::vector<reco::PFRecHit::REPPoint>& corners = rhit->ptr->getCornersREP();
       if(corners.size() != 4) continue;
       
       double rhsizeEta = fabs(corners[0].Eta() - corners[2].Eta());
       double rhsizePhi = fabs(corners[0].Phi() - corners[2].Phi());
       if ( rhsizePhi > M_PI ) rhsizePhi = 2.*M_PI - rhsizePhi;
       
       double deta = fabs(rhrep.Eta() - tracketa);
       double dphi = fabs(rhrep.Phi() - trackphi);
       if ( dphi > M_PI ) dphi = 2.*M_PI - dphi;
       
       // Find all clusters associated to given rechit
       RecHit2BlockEltMap::iterator ret = rechit2ClusterLinks_.find(rhit->ptr);
       
       for(BlockEltSet::const_iterator clusterIt = ret->second.begin(); 
       clusterIt != ret->second.end(); clusterIt++) {
     
     reco::PFClusterRef clusterref = (*clusterIt)->clusterRef();
     double clusterz = clusterref->position().Z();
     int fracsNbr = clusterref->recHitFractions().size();
 
     if (clusterref->layer() == PFLayer::ECAL_BARREL){ // BARREL
       // Check if the track is in the barrel
       if (fabs(trackz) > 300.) continue;
 
       double _rhsizeEta = rhsizeEta * (2.00 + 1.0 / (fracsNbr * std::min(1.,trackPt/2.)));
       double _rhsizePhi = rhsizePhi * (2.00 + 1.0 / (fracsNbr * std::min(1.,trackPt/2.)));
       
       // Check if the track and the cluster are linked
       if(deta < (_rhsizeEta / 2.) && dphi < (_rhsizePhi / 2.))
         target2ClusterLinks_[*it].insert(*clusterIt);
 
       
     } else { // ENDCAP
 
       // Check if the track is in the cap
       if (fabs(trackz) < 300.) continue;
       if (trackz * clusterz < 0.) continue;
       
       double x[5];
       double y[5];
       for ( unsigned jc=0; jc<4; ++jc ) {
         math::XYZPoint cornerposxyz = cornersxyz[jc];
         x[jc] = cornerposxyz.X() + (cornerposxyz.X()-posxyz.X())
           * (1.00+0.50/fracsNbr /std::min(1.,trackPt/2.));
         y[jc] = cornerposxyz.Y() + (cornerposxyz.Y()-posxyz.Y())
           * (1.00+0.50/fracsNbr /std::min(1.,trackPt/2.));
       }
       
       x[4] = x[0];
       y[4] = y[0];
       
       bool isinside = TMath::IsInside(trackx,
                       tracky,
                       5,x,y);
       
       // Check if the track and the cluster are linked
       if( isinside )
         target2ClusterLinks_[*it].insert(*clusterIt);
     }
       }
     }
   }
 }

void KDTreeLinkerTrackEcal::updatePFBlockEltWithLinks ( )

virtual

Implements KDTreeLinkerBase.

Definition at line 207 of file KDTreeLinkerTrackEcal.cc.

References reco::PFMultiLinksTC::linkedClusters, and target2ClusterLinks_.

 {
   //TODO YG : Check if cluster positionREP() is valid ?
 
   // Here we save in each track the list of phi/eta values of linked clusters.
   for (BlockElt2BlockEltMap::iterator it = target2ClusterLinks_.begin();
        it != target2ClusterLinks_.end(); ++it) {
     reco::PFMultiLinksTC multitracks(true);
 
     for (BlockEltSet::iterator jt = it->second.begin();
      jt != it->second.end(); ++jt) {
 
       double clusterPhi = (*jt)->clusterRef()->positionREP().Phi();
       double clusterEta = (*jt)->clusterRef()->positionREP().Eta();
 
       multitracks.linkedClusters.push_back(std::make_pair(clusterPhi, clusterEta));
     }
 
     it->first->setMultilinks(multitracks);
   }
 }