/afs/cern.ch/work/a/aaltunda/public/www/CMSSW_5_3_14/src/RecoPixelVertexing/PixelLowPtUtilities/plugins/ClusterShapeSeedComparitor.cc

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#include "RecoTracker/TkSeedingLayers/interface/SeedComparitor.h"
#include "RecoTracker/TkSeedingLayers/interface/SeedComparitorFactory.h"
#include "FWCore/ParameterSet/interface/ParameterSet.h"
#include "RecoPixelVertexing/PixelLowPtUtilities/interface/ClusterShapeHitFilter.h"
#include "DataFormats/TrackerRecHit2D/interface/SiPixelRecHit.h"
#include "DataFormats/TrackerRecHit2D/interface/SiStripRecHit2D.h"
#include "DataFormats/TrackerRecHit2D/interface/SiStripMatchedRecHit2D.h"
#include "DataFormats/TrackerRecHit2D/interface/ProjectedSiStripRecHit2D.h"
#include "FWCore/Framework/interface/ESHandle.h"
#include "RecoTracker/Record/interface/CkfComponentsRecord.h"
#include "RecoTracker/TkSeedGenerator/interface/FastHelix.h"
#include "RecoTracker/TkSeedingLayers/interface/SeedingHitSet.h"
#include "MagneticField/Engine/interface/MagneticField.h"
#include <cstdio>
#include <cassert>

class PixelClusterShapeSeedComparitor : public SeedComparitor {
    public:
        PixelClusterShapeSeedComparitor(const edm::ParameterSet &cfg) ;
        virtual ~PixelClusterShapeSeedComparitor() ; 
        virtual void init(const edm::EventSetup& es) ;
        virtual bool compatible(const SeedingHitSet  &hits, const TrackingRegion & region) const { return true; }
        virtual bool compatible(const TrajectorySeed &seed) const { return true; }
        virtual bool compatible(const TrajectoryStateOnSurface &,
                const TransientTrackingRecHit::ConstRecHitPointer &hit) const ;
        virtual bool compatible(const SeedingHitSet  &hits, 
                const GlobalTrajectoryParameters &helixStateAtVertex,
                const FastHelix                  &helix,
                const TrackingRegion & region) const ;
        virtual bool compatible(const SeedingHitSet  &hits, 
                const GlobalTrajectoryParameters &straightLineStateAtVertex,
                const TrackingRegion & region) const ;

    private:
        bool compatibleHit(const TransientTrackingRecHit &hit, const GlobalVector &direction) const ;

        std::string filterName_;
        mutable edm::ESHandle<ClusterShapeHitFilter> filterHandle_;
        bool filterAtHelixStage_;
        bool filterPixelHits_, filterStripHits_;
};


PixelClusterShapeSeedComparitor::PixelClusterShapeSeedComparitor(const edm::ParameterSet &cfg) :
    filterName_(cfg.getParameter<std::string>("ClusterShapeHitFilterName")),
    filterAtHelixStage_(cfg.getParameter<bool>("FilterAtHelixStage")),
    filterPixelHits_(cfg.getParameter<bool>("FilterPixelHits")),
    filterStripHits_(cfg.getParameter<bool>("FilterStripHits"))
{
}

PixelClusterShapeSeedComparitor::~PixelClusterShapeSeedComparitor() 
{
}

void
PixelClusterShapeSeedComparitor::init(const edm::EventSetup& es) {
    es.get<CkfComponentsRecord>().get(filterName_, filterHandle_);
}


bool
PixelClusterShapeSeedComparitor::compatible(const TrajectoryStateOnSurface &tsos,
                const TransientTrackingRecHit::ConstRecHitPointer &hit) const
{
    if (filterAtHelixStage_) return true;
    assert(hit->isValid() && tsos.isValid());
    return compatibleHit(*hit, tsos.globalDirection());
}

bool
PixelClusterShapeSeedComparitor::compatible(const SeedingHitSet  &hits, 
        const GlobalTrajectoryParameters &straightLineStateAtVertex,
        const TrackingRegion & region) const 
{ 
    return true; 
}

bool
PixelClusterShapeSeedComparitor::compatible(const SeedingHitSet  &hits, 
        const GlobalTrajectoryParameters &helixStateAtVertex,
        const FastHelix                  &helix,
        const TrackingRegion & region) const 
{ 
    if (!filterAtHelixStage_) return true;
    float xc = helix.circle().x0(), yc = helix.circle().y0();

    GlobalPoint  vertex = helixStateAtVertex.position();
    GlobalVector momvtx = helixStateAtVertex.momentum();
    float x0 = vertex.x(), y0 = vertex.y();
    for (unsigned int i = 0, n = hits.size(); i < n; ++i) {
        const TransientTrackingRecHit &hit = *hits[i];
        GlobalPoint pos = hit.globalPosition();
        float x1 = pos.x(), y1 = pos.y(), dx1 = x1 - xc, dy1 = y1 - yc;

        // now figure out the proper tangent vector
        float perpx = -dy1, perpy = dx1;
        if (perpx * (x1-x0) + perpy * (y1 - y0) < 0) {
            perpy = -perpy; perpx = -perpx;
        }
       
        // now normalize (perpx, perpy, 1.0) to momentum (px, py, pz)
        float perp2 = perpx*perpx + perpy*perpy; 
        float pmom2 = momvtx.x()*momvtx.x() + momvtx.y()*momvtx.y(), momz2 = momvtx.z()*momvtx.z(), mom2 = pmom2 + momz2;
        float perpscale = sqrt(pmom2/mom2 / perp2), zscale = sqrt((1-pmom2/mom2));
        GlobalVector gdir(perpx*perpscale, perpy*perpscale, (momvtx.z() > 0 ? zscale : -zscale));

        if (!compatibleHit(hit, gdir)) {
            return false; // not yet
        }
    }
    return true; 
}

bool 
PixelClusterShapeSeedComparitor::compatibleHit(const TransientTrackingRecHit &hit, const GlobalVector &direction) const 
{
    if (hit.geographicalId().subdetId() <= 2) {
        if (!filterPixelHits_) return true;    
        const SiPixelRecHit *pixhit = dynamic_cast<const SiPixelRecHit *>(hit.hit());
        if (pixhit == 0) throw cms::Exception("LogicError", "Found a valid hit on the pixel detector which is not a SiPixelRecHit\n");
        //printf("Cheching hi hit on detid %10d, local direction is x = %9.6f, y = %9.6f, z = %9.6f\n", hit.geographicalId().rawId(), direction.x(), direction.y(), direction.z());
        return filterHandle_->isCompatible(*pixhit, direction);
    } else {
        if (!filterStripHits_) return true;
        const std::type_info &tid = typeid(*hit.hit());
        if (tid == typeid(SiStripMatchedRecHit2D)) {
            const SiStripMatchedRecHit2D* matchedHit = dynamic_cast<const SiStripMatchedRecHit2D *>(hit.hit());
            assert(matchedHit != 0);
            return (filterHandle_->isCompatible(DetId(matchedHit->monoId()), matchedHit->monoCluster(), direction) &&
                    filterHandle_->isCompatible(DetId(matchedHit->stereoId()), matchedHit->stereoCluster(), direction));
        } else if (tid == typeid(SiStripRecHit2D)) {
            const SiStripRecHit2D* recHit = dynamic_cast<const SiStripRecHit2D *>(hit.hit());
            assert(recHit != 0);
            return filterHandle_->isCompatible(*recHit, direction);
        } else if (tid == typeid(ProjectedSiStripRecHit2D)) {
            const ProjectedSiStripRecHit2D* precHit = dynamic_cast<const ProjectedSiStripRecHit2D *>(hit.hit());
            assert(precHit != 0);
            return filterHandle_->isCompatible(precHit->originalHit(), direction);
        } else {
            //printf("Questo e' un %s, che ci fo?\n", tid.name());
            return true;
        }
    }
}

DEFINE_EDM_PLUGIN(SeedComparitorFactory, PixelClusterShapeSeedComparitor, "PixelClusterShapeSeedComparitor");