Associator_DeltaRCosmics.h

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/* emacs: this is -*- c++ -*- */
 
 
#ifndef TrigInDetAnalysisUtils_Associator_DeltaRCosmics_H
#define TrigInDetAnalysisUtils_Associator_DeltaRCosmics_H
 
 
#include <iostream>
#include <string>
#include <cmath>
#include <map>
 
#include "TrigInDetAnalysis/TrackAssociator.h"
#include "TrigInDetAnalysis/Track.h"
 
 
class Associator_DeltaRCosmics : public TrackAssociator {
 
public:
  
  Associator_DeltaRCosmics(const std::string& name, double deltaR) : TrackAssociator(name), m_deltaR2(deltaR*deltaR) {} 
  
  ~Associator_DeltaRCosmics() { } 
 
  
  virtual void match(const std::vector<TIDA::Track*>& referenceTracks, 
             const std::vector<TIDA::Track*>& testTracks) {
 
    // Clear previously filled association map
    clear();
    
    // Loop over reference tracks
    std::vector<TIDA::Track*>::const_iterator reference, referenceEnd=referenceTracks.end();
    for(reference=referenceTracks.begin(); reference!=referenceEnd; reference++) {
      
      // Loop over test tracks and find the closest
      TIDA::Track* bestMatch = NULL;
      double bestDeltaR=1000;
      
      std::vector<TIDA::Track*>::const_iterator test, testEnd=testTracks.end();
      for(test=testTracks.begin(); test!=testEnd; test++) {
 
    // Evaluate distance between reference and test tracks
    double deta = (*reference)->eta() + (*test)->eta();
    double dphi = (*reference)->phi() - (*test)->phi() - M_PI;
    if(dphi>M_PI)  dphi-=2*M_PI;
    if(dphi<-M_PI) dphi+=2*M_PI;
    double deltaR =  deta*deta+dphi*dphi;
 
    // Check if this is the best match so far
    if(bestMatch==NULL || deltaR<bestDeltaR) { 
      bestDeltaR = deltaR;
      bestMatch  = (*test);
    } 
      }
 
      // Check if the best match is within delta R specifications
      if(bestMatch && bestDeltaR<m_deltaR2) { 
    // Create reference->test and test->reference associations
    mmatched.insert(map_type::value_type(*reference, bestMatch));
    mrevmatched.insert( map_type::value_type(bestMatch, *reference));
      }
    }
  }
  
private:
  
  double m_deltaR2;
  
};
 
 
#endif  // TrigInDetAnalysisUtils_Associator_DeltaRCosmics_H