/afs/cern.ch/work/a/aaltunda/public/www/CMSSW_6_2_5/src/RecoTracker/DebugTools/src/FTSFromSimHitFactory.cc

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#include "RecoTracker/DebugTools/interface/FTSFromSimHitFactory.h"
#include "SimDataFormats/TrackingHit/interface/PSimHit.h"
#include "Geometry/CommonDetUnit/interface/GeomDetUnit.h"
#include "TrackingTools/TrajectoryParametrization/interface/GlobalTrajectoryParameters.h"
#include <algorithm>

FreeTrajectoryState FTSFromSimHitFactory::operator()( const PSimHit& hit, 
                                                      const GeomDetUnit& det,
                                                      const MagneticField& field) const
{
  GlobalVector momenta = det.toGlobal( hit.momentumAtEntry());
  TrackCharge ch = charge( hit.particleType());
  GlobalTrajectoryParameters param( det.toGlobal( hit.localPosition()), momenta, ch, &field);
  return FreeTrajectoryState( param);
}

TrackCharge FTSFromSimHitFactory::charge( int particleId) const
{
  if (std::abs( particleId) < 20) {
    // lepton 
    return TrackCharge( (particleId > 0) ? -1 : 1);
  }
  else {
    // only correct for stable mesoms and baryons
    return TrackCharge( (particleId > 0) ? 1 : -1);
  }
}