---

TkPixelMeasurementDet.cc

Go to the documentation of this file.

#include "RecoTracker/MeasurementDet/interface/TkPixelMeasurementDet.h"
#include "TrackingTools/TransientTrackingRecHit/interface/InvalidTransientRecHit.h"
#include "Geometry/CommonTopologies/interface/PixelTopology.h"
#include "TrackingTools/MeasurementDet/interface/MeasurementDetException.h"
#include "TrackingTools/PatternTools/interface/TrajectoryMeasurement.h"
#include "RecoTracker/TransientTrackingRecHit/interface/TSiPixelRecHit.h"
#include "DataFormats/TrackerRecHit2D/interface/SiPixelRecHit.h"
#include "TrackingTools/PatternTools/interface/MeasurementEstimator.h"
#include "TrackingTools/PatternTools/interface/TrajMeasLessEstim.h"

TkPixelMeasurementDet::TkPixelMeasurementDet( const GeomDet* gdet,
                                              const PixelClusterParameterEstimator* cpe) : 
    MeasurementDet (gdet),
    theCPE(cpe),
    empty(true),
    active_(true)
  {
    thePixelGDU = dynamic_cast<const PixelGeomDetUnit*>(gdet);
    if (thePixelGDU == 0) {
      throw MeasurementDetException( "TkPixelMeasurementDet constructed with a GeomDet which is not a PixelGeomDetUnit");
    }
  }

std::vector<TrajectoryMeasurement> 
TkPixelMeasurementDet::fastMeasurements( const TrajectoryStateOnSurface& stateOnThisDet, 
                                         const TrajectoryStateOnSurface& startingState, 
                                         const Propagator&, 
                                         const MeasurementEstimator& est) const
{
  std::vector<TrajectoryMeasurement> result;

  if (active_ == false) {
    result.push_back( TrajectoryMeasurement( stateOnThisDet, 
                InvalidTransientRecHit::build(&geomDet(), TrackingRecHit::inactive), 
                0.F));
    return result;
  }
 
  MeasurementDet::RecHitContainer allHits = recHits( stateOnThisDet);
  for (RecHitContainer::const_iterator ihit=allHits.begin();
       ihit != allHits.end(); ihit++) {
    std::pair<bool,double> diffEst = est.estimate( stateOnThisDet, **ihit);
    if ( diffEst.first) {
      result.push_back( TrajectoryMeasurement( stateOnThisDet, *ihit, 
                                               diffEst.second));
    }
    //RC else delete *ihit; // we own allHits and have to delete the ones we don't return
  }
  if ( result.empty()) {
    // create a TrajectoryMeasurement with an invalid RecHit and zero estimate
    result.push_back( TrajectoryMeasurement( stateOnThisDet, 
                                             InvalidTransientRecHit::build(&geomDet()), 0.F)); 
  }
  else {
    // sort results according to estimator value
    if ( result.size() > 1) {
      sort( result.begin(), result.end(), TrajMeasLessEstim());
    }
  }
  return result;
}

TransientTrackingRecHit::RecHitPointer
TkPixelMeasurementDet::buildRecHit( const SiPixelClusterRef & cluster,
                                    const LocalTrajectoryParameters & ltp) const
{
  const GeomDetUnit& gdu( specificGeomDet());
  LocalValues lv = theCPE->localParameters( * cluster, gdu, ltp );
  return TSiPixelRecHit::build( lv.first, lv.second, &geomDet(), cluster, theCPE);
}

TkPixelMeasurementDet::RecHitContainer 
TkPixelMeasurementDet::recHits( const TrajectoryStateOnSurface& ts ) const
{
  RecHitContainer result;
  if (empty == true ) return result;
  if (active_ == false) return result; 
  for ( const_iterator ci = detSet_.begin(); ci != detSet_.end(); ++ ci ) {
    SiPixelClusterRef cluster = edmNew::makeRefTo( handle_, ci ); 
    result.push_back( buildRecHit( cluster, ts.localParameters() ) );
  }
  return result;
}

---