UncertainPerigeeCircle.cc

/**************************************************************************
 * basf2 (Belle II Analysis Software Framework)                           *
 * Author: The Belle II Collaboration                                     *
 *                                                                        *
 * See git log for contributors and copyright holders.                    *
 * This file is licensed under LGPL-3.0, see LICENSE.md.                  *
 **************************************************************************/
#include <tracking/trackingUtilities/geometry/UncertainPerigeeCircle.h>
 
#include <tracking/trackingUtilities/geometry/PerigeeCircle.h>
#include <tracking/trackingUtilities/geometry/PerigeeParameters.h>
 
#include <ostream>
 
using namespace Belle2;
using namespace TrackingUtilities;
 
UncertainPerigeeCircle
UncertainPerigeeCircle::average(const UncertainPerigeeCircle& fromPerigeeCircle,
                                const UncertainPerigeeCircle& toPerigeeCircle)
{
  const PerigeeParameters& fromPar = fromPerigeeCircle.perigeeParameters();
  const PerigeeCovariance& fromCov = fromPerigeeCircle.perigeeCovariance();
 
  const PerigeeParameters& toPar = toPerigeeCircle.perigeeParameters();
  const PerigeeCovariance& toCov = toPerigeeCircle.perigeeCovariance();
 
  PerigeeParameters avgPar;
  PerigeeCovariance avgCov;
 
  double loc_chi2 = PerigeeUtil::average(fromPar, fromCov, toPar, toCov, avgPar, avgCov);
 
  // Calculating 3 parameters from 6 input parameters. 3 NDF remaining.
  size_t loc_ndf = 3;
 
  return UncertainPerigeeCircle(avgPar, avgCov, loc_chi2, loc_ndf);
}
 
std::ostream& TrackingUtilities::operator<<(std::ostream& output, const UncertainPerigeeCircle& circle)
{
  return output << "UncertainPerigeeCircle("
         << "curvature=" << circle->curvature() << ","
         << "phi0=" << circle->phi0() << ","
         << "impact=" << circle->impact() << ")";
}