BeamHaloPairGenerator.cc

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#include "RecoTracker/SpecialSeedGenerators/interface/BeamHaloPairGenerator.h"
#include "RecoTracker/TkSeedingLayers/interface/SeedingLayerSetsBuilder.h"
typedef TransientTrackingRecHit::ConstRecHitPointer SeedingHit;

#include "FWCore/MessageLogger/interface/MessageLogger.h"
using namespace ctfseeding;


BeamHaloPairGenerator::BeamHaloPairGenerator(const edm::ParameterSet& conf): conf_(conf){
    edm::LogInfo("CtfSpecialSeedGenerator|BeamHaloPairGenerator") << "Constructing BeamHaloPairGenerator";
    theMaxTheta=conf.getParameter<double>("maxTheta");
    theMaxTheta=fabs(sin(theMaxTheta));
} 


SeedingLayerSets BeamHaloPairGenerator::init(const edm::EventSetup& es){
    edm::ParameterSet leyerPSet = conf_.getParameter<edm::ParameterSet>("LayerPSet");
    SeedingLayerSetsBuilder lsBuilder(leyerPSet);
    SeedingLayerSets lss = lsBuilder.layers(es);
    return lss; 
}


const OrderedSeedingHits& BeamHaloPairGenerator::run(const TrackingRegion& region,
                                        const edm::Event& e,
                                            const edm::EventSetup& es){
    hitPairs.clear();
    SeedingLayerSets lss = init(es);
    SeedingLayerSets::const_iterator iLss;
    for (iLss = lss.begin(); iLss != lss.end(); iLss++){
        SeedingLayers ls = *iLss;
        if (ls.size() != 2){
                    throw cms::Exception("CtfSpecialSeedGenerator") << "You are using " << ls.size() <<" layers in set instead of 2 ";
            }   
        std::vector<SeedingHit> innerHits  = region.hits(e, es, &ls[0]);
        std::vector<SeedingHit> outerHits  = region.hits(e, es, &ls[1]);
        std::vector<SeedingHit>::const_iterator iOuterHit;
        for (iOuterHit = outerHits.begin(); iOuterHit != outerHits.end(); iOuterHit++){
            std::vector<SeedingHit>::const_iterator iInnerHit;
            for (iInnerHit = innerHits.begin(); iInnerHit != innerHits.end(); iInnerHit++){
              //do something in there... if necessary
              const TransientTrackingRecHit::ConstRecHitPointer & crhpi = *iInnerHit;
              const TransientTrackingRecHit::ConstRecHitPointer & crhpo =  *iOuterHit;
              GlobalVector d=crhpo->globalPosition() - crhpi->globalPosition();
              double ABSsinDtheta = fabs(sin(d.theta()));
              LogDebug("BeamHaloPairGenerator")<<"position1: "<<crhpo->globalPosition()
                               <<" position2: "<<crhpi->globalPosition()
                               <<" |sin(Dtheta)|: "<< ABSsinDtheta <<((ABSsinDtheta>theMaxTheta)?" skip":" keep");

              if (ABSsinDtheta>theMaxTheta) {;continue;}

              hitPairs.push_back(OrderedHitPair(*iInnerHit,
                                *iOuterHit));
            }
        }
        }
    return hitPairs;
}