#include <KDTreeLinkerPSEcal.h>

Inheritance diagram for KDTreeLinkerPSEcal:

Public Member Functions
void	buildTree ()
void	clear ()
void	insertFieldClusterElt (reco::PFBlockElement *ecalCluster)
void	insertTargetElt (reco::PFBlockElement *psCluster)
	KDTreeLinkerPSEcal ()
void	searchLinks ()
void	updatePFBlockEltWithLinks ()
	~KDTreeLinkerPSEcal ()
Private Member Functions
void	buildTree (const RecHitSet &rechitsSet, KDTreeLinkerAlgo &tree)
Private Attributes
BlockEltSet	fieldClusterSet_
const double	ps1ToEcal_
const double	ps2ToEcal_
RecHit2BlockEltMap	rechit2ClusterLinks_
RecHitSet	rechitsNegSet_
RecHitSet	rechitsPosSet_
const double	resPSlength_
const double	resPSpitch_
BlockElt2BlockEltMap	target2ClusterLinks_
BlockEltSet	targetSet_
KDTreeLinkerAlgo	treeNeg_
KDTreeLinkerAlgo	treePos_

Detailed Description

Definition at line 12 of file KDTreeLinkerPSEcal.h.

Constructor & Destructor Documentation

KDTreeLinkerPSEcal::KDTreeLinkerPSEcal ( )

Definition at line 6 of file KDTreeLinkerPSEcal.cc.

  : KDTreeLinkerBase(),
    resPSpitch_ (0.19),
    resPSlength_ (6.1),
    ps1ToEcal_ (1.072),
    ps2ToEcal_ (1.057)
{}

KDTreeLinkerPSEcal::~KDTreeLinkerPSEcal ( )

Definition at line 14 of file KDTreeLinkerPSEcal.cc.

References clear().

{
  clear();
}

Member Function Documentation

void KDTreeLinkerPSEcal::buildTree ( ) [virtual]

Implements KDTreeLinkerBase.

Definition at line 68 of file KDTreeLinkerPSEcal.cc.

References rechitsNegSet_, rechitsPosSet_, treeNeg_, and treePos_.

{
  buildTree(rechitsNegSet_, treeNeg_);
  buildTree(rechitsPosSet_, treePos_);
}

void KDTreeLinkerPSEcal::buildTree	(	const RecHitSet &	rechitsSet,
		KDTreeLinkerAlgo &	tree
	)		`[private]`

Definition at line 75 of file KDTreeLinkerPSEcal.cc.

References KDTreeLinkerAlgo::build(), and reco::PFRecHit::position().

{
  // List of pseudo-rechits that will be used to create the KDTree
  std::vector<KDTreeNodeInfo> eltList;

  // Filling of this eltList
  for(RecHitSet::const_iterator it = rechitsSet.begin(); 
      it != rechitsSet.end(); it++) {

    const reco::PFRecHit* rh = *it;
    const math::XYZPoint& posxyz = rh->position();
        
    KDTreeNodeInfo rhinfo (rh, posxyz.X(), posxyz.Y());
    eltList.push_back(rhinfo);
  }

  // xmin-xmax, ymain-ymax
  KDTreeBox region(-150., 150., -150., 150.);

  // We may now build the KDTree
  tree.build(eltList, region);
}

void KDTreeLinkerPSEcal::clear ( void ) [virtual]

Implements KDTreeLinkerBase.

Definition at line 230 of file KDTreeLinkerPSEcal.cc.

References KDTreeLinkerAlgo::clear(), fieldClusterSet_, rechit2ClusterLinks_, rechitsNegSet_, rechitsPosSet_, target2ClusterLinks_, targetSet_, treeNeg_, and treePos_.

Referenced by ~KDTreeLinkerPSEcal().

{
  targetSet_.clear();
  fieldClusterSet_.clear();

  rechitsNegSet_.clear();
  rechitsPosSet_.clear();

  rechit2ClusterLinks_.clear();
  target2ClusterLinks_.clear();

  treeNeg_.clear();
  treePos_.clear();
}

void KDTreeLinkerPSEcal::insertFieldClusterElt ( reco::PFBlockElement * ecalCluster ) [virtual]

Implements KDTreeLinkerBase.

Definition at line 35 of file KDTreeLinkerPSEcal.cc.

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

Referenced by PFBlockAlgo::setInput().

{
  reco::PFClusterRef clusterref = ecalCluster->clusterRef();

  if (clusterref->layer() != PFLayer::ECAL_ENDCAP)
    return;
          
  const std::vector<reco::PFRecHitFraction> &fraction = clusterref->recHitFractions();

  // We create a list of cluster
  fieldClusterSet_.insert(ecalCluster);

  double clusterz = clusterref->position().Z();
  RecHitSet& rechitsSet = (clusterz < 0) ? rechitsNegSet_ : rechitsPosSet_;

  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 Clusters
    rechit2ClusterLinks_[&rechit].insert(ecalCluster);
    
    // We create a liste of rechits
    rechitsSet.insert(&rechit);
  }
}

void KDTreeLinkerPSEcal::insertTargetElt ( reco::PFBlockElement * psCluster ) [virtual]

Implements KDTreeLinkerBase.

Definition at line 21 of file KDTreeLinkerPSEcal.cc.

References reco::PFBlockElement::clusterRef(), and targetSet_.

Referenced by PFBlockAlgo::setInput().

{
  reco::PFClusterRef clusterref = psCluster->clusterRef();

  // This test is more or less done in PFBlockAlgo.h. In others cases, it should be switch on.
  //   if (!((clusterref->layer() == PFLayer::PS1) || 
  //    (clusterref->layer() == PFLayer::PS2)))
  //     return;

  targetSet_.insert(psCluster);
}

void KDTreeLinkerPSEcal::searchLinks ( ) [virtual]

Implements KDTreeLinkerBase.

Definition at line 100 of file KDTreeLinkerPSEcal.cc.

References KDTreeLinkerBase::getCristalXYMaxSize(), reco::PFCluster::layer(), reco::CaloCluster::position(), reco::PFCluster::positionREP(), PFLayer::PS1, ps1ToEcal_, ps2ToEcal_, rechit2ClusterLinks_, resPSlength_, resPSpitch_, runTheMatrix::ret, KDTreeLinkerAlgo::search(), target2ClusterLinks_, targetSet_, treeNeg_, treePos_, x, and detailsBasic3DVector::y.

{
  // Must of the code has been taken from LinkByRecHit.cc

  // We iterate over the PS clusters.
  for(BlockEltSet::iterator it = targetSet_.begin(); 
      it != targetSet_.end(); it++) {

    (*it)->setIsValidMultilinks(true);
        
    reco::PFClusterRef clusterPSRef = (*it)->clusterRef();
    const reco::PFCluster& clusterPS = *clusterPSRef;

    // PS cluster position, extrapolated to ECAL
    double zPS = clusterPS.position().Z();
    double xPS = clusterPS.position().X();
    double yPS = clusterPS.position().Y();

    double etaPS = fabs(clusterPS.positionREP().eta());
    double deltaX = 0.;
    double deltaY = 0.;
    double xPSonEcal = xPS;
    double yPSonEcal = yPS;

    if (clusterPS.layer() == PFLayer::PS1) { // PS1

      // vertical strips, measure x with pitch precision
      deltaX = resPSpitch_;
      deltaY = resPSlength_;
      xPSonEcal *= ps1ToEcal_;
      yPSonEcal *= ps1ToEcal_;

    } else { // PS2

      // horizontal strips, measure y with pitch precision
      deltaY = resPSpitch_;
      deltaX = resPSlength_;
      xPSonEcal *= ps2ToEcal_;
      yPSonEcal *= ps2ToEcal_;

    }
 
    
    // Estimate the maximal envelope in phi/eta that will be used to find rechit candidates.
    // Same envelope for cap et barrel rechits.
    
    
    double maxEcalRadius = getCristalXYMaxSize() / 2.;

    // The inflation factor includes the approximate projection from Preshower to ECAL
    double inflation = 2.4 - (etaPS-1.6);
    double rangeX = maxEcalRadius * (1 + (0.05 + 1.0 / maxEcalRadius * deltaX / 2.)) * inflation; 
    double rangeY = maxEcalRadius * (1 + (0.05 + 1.0 / maxEcalRadius * deltaY / 2.)) * inflation; 
    
    // We search for all candidate recHits, ie all recHits contained in the maximal size envelope.
    std::vector<KDTreeNodeInfo> recHits;
    KDTreeBox trackBox(xPSonEcal - rangeX, xPSonEcal + rangeX, 
                  yPSonEcal - rangeY, yPSonEcal + rangeY);

    if (zPS < 0)
      treeNeg_.search(trackBox, recHits);
    else
      treePos_.search(trackBox, recHits);


    for(std::vector<KDTreeNodeInfo>::const_iterator rhit = recHits.begin(); 
        rhit != recHits.end(); ++rhit) {
           
      const std::vector< math::XYZPoint >& corners = rhit->ptr->getCornersXYZ();
      if(corners.size() != 4) continue;

      // 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();

        const math::XYZPoint& posxyz = rhit->ptr->position() * zPS / clusterz;

        double x[5];
        double y[5];
        for ( unsigned jc=0; jc<4; ++jc ) {
          math::XYZPoint cornerpos = corners[jc] * zPS / clusterz;
          x[jc] = cornerpos.X() + (cornerpos.X()-posxyz.X()) * (0.05 +1.0/fabs((cornerpos.X()-posxyz.X()))*deltaX/2.);
          y[jc] = cornerpos.Y() + (cornerpos.Y()-posxyz.Y()) * (0.05 +1.0/fabs((cornerpos.Y()-posxyz.Y()))*deltaY/2.);
        }

        x[4] = x[0];
        y[4] = y[0];
        
        bool isinside = TMath::IsInside(xPS,
                                        yPS,
                                        5,x,y);
        
        // Check if the track and the cluster are linked
        if( isinside )
          target2ClusterLinks_[*it].insert(*clusterIt); 
      }
    }
    
  }
}

void KDTreeLinkerPSEcal::updatePFBlockEltWithLinks ( ) [virtual]

Implements KDTreeLinkerBase.

Definition at line 207 of file KDTreeLinkerPSEcal.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);
  }
}