CircleRadius.h

/**************************************************************************
 * 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.                  *
 **************************************************************************/
 
#pragma once
 
#include <tracking/trackFindingVXD/filterMap/filterFramework/SelectionVariable.h>
#include <tracking/trackFindingVXD/filterMap/threeHitVariables/CircleCenterXY.h>
#include <framework/geometry/B2Vector3.h>
 
#define CIRCLERADIUS_NAME CircleRadius
namespace Belle2 {
  template <typename PointType >
  class CIRCLERADIUS_NAME : public SelectionVariable< PointType, 3, double > {
  public:
 
    PUT_NAME_FUNCTION(CIRCLERADIUS_NAME);
 
 
    static double value(const PointType& outerHit, const PointType& centerHit, const PointType& innerHit)
    {
      B2Vector3D circleCenter = CircleCenterXY<PointType>::value(outerHit, centerHit, innerHit);
 
      return CIRCLERADIUS_NAME<PointType>::calcAvgDistanceXY(outerHit, centerHit, innerHit, circleCenter);
    } // return unit: cm
 
    static double calcAvgDistanceXY(const PointType& a, const PointType& b, const PointType& c, const B2Vector3<double>& center)
    {
      return (sqrt(std::pow(center.X() - a.X(), 2) + std::pow(center.Y() - a.Y(), 2)) +
              sqrt(std::pow(center.X() - b.X(), 2) + std::pow(center.Y() - b.Y(), 2)) +
              sqrt(std::pow(center.X() - c.X(), 2) + std::pow(center.Y() - c.Y(), 2))) / 3.;
    } // = radius in [cm], sign here not needed. normally: signKappaAB/normAB1
 
 
  };
 
}