HGCal3DClustering.h

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#ifndef RecoLocalCalo_HGCalRecAlgos_HGCal3DClustering
#define RecoLocalCalo_HGCalRecAlgos_HGCal3DClustering


#include "DataFormats/Math/interface/Point3D.h"
#include "DataFormats/EgammaReco/interface/BasicCluster.h"
#include "DataFormats/ParticleFlowReco/interface/HGCalMultiCluster.h"

#include <vector>
#include <array>

#include "RecoLocalCalo/HGCalRecAlgos/interface/RecHitTools.h"
#include "RecoLocalCalo/HGCalRecAlgos/interface/ClusterTools.h"
#include "RecoLocalCalo/HGCalRecProducers/interface/HGCalClusteringAlgoBase.h"

#include "KDTreeLinkerAlgoT.h"

class HGCal3DClustering
{
public:

 HGCal3DClustering() : radii({0.,0.,0.}), minClusters(0), clusterTools(nullptr)
  {
  }

 HGCal3DClustering(const edm::ParameterSet& conf, edm::ConsumesCollector& sumes, const std::vector<double>& radii_in, uint32_t min_clusters) :
  radii(radii_in),
  minClusters(min_clusters),
  points(2*(maxlayer+1)),
  minpos(2*(maxlayer+1),{ {0.0f,0.0f} }),
  maxpos(2*(maxlayer+1),{ {0.0f,0.0f} }),
  es(0),
  zees(2*(maxlayer+1),0.),
  clusterTools(std::make_unique<hgcal::ClusterTools>(conf,sumes))
  {
  }

  void getEvent(const edm::Event& ev) { clusterTools->getEvent(ev); }
  void getEventSetup(const edm::EventSetup& es)
  {
    clusterTools->getEventSetup(es);
    rhtools_.getEventSetup(es);
  }

  typedef std::vector<reco::BasicCluster> ClusterCollection;

  std::vector<reco::HGCalMultiCluster> makeClusters(const reco::HGCalMultiCluster::ClusterCollection &);

private:

  void organizeByLayer(const reco::HGCalMultiCluster::ClusterCollection &);
  void reset(){
    for( auto& it: points)
      {
        it.clear();
        std::vector<KDNode>().swap(it);
      }
    std::fill(zees.begin(), zees.end(), 0.);
    for(unsigned int i = 0; i < minpos.size(); i++)
      {
    minpos[i][0]=0.;minpos[i][1]=0.;
    maxpos[i][0]=0.;maxpos[i][1]=0.;
      }
  }
  void layerIntersection(std::array<double,3> &to, const std::array<double,3> &from) const;

  //max number of layers
  static const unsigned int maxlayer = HGCalClusteringAlgoBase::maxlayer;

  std::vector<double> radii;
  uint32_t minClusters;
  struct ClusterRef {
    int ind;
    float z;
    ClusterRef(int ind_i, float z_i): ind(ind_i),z(z_i){}
    ClusterRef(): ind(-1),z(0.){}
  };

  typedef KDTreeLinkerAlgo<ClusterRef,2> KDTree;
  typedef KDTreeNodeInfoT<ClusterRef,2> KDNode;
  std::vector< std::vector<KDNode> > points;
  std::vector<std::array<float,2> > minpos;
  std::vector<std::array<float,2> > maxpos;
  std::vector<size_t> es; 
  std::vector<float> zees; 
  std::unique_ptr<hgcal::ClusterTools> clusterTools; 
  hgcal::RecHitTools rhtools_; 
  static const unsigned int lastLayerEE = 28;
  static const unsigned int lastLayerFH = 40;
  static const unsigned int lastLayerBH = 52;

};

#endif