SignCurvatureXY.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 <boost/math/special_functions/sign.hpp>
 
#include <framework/geometry/B2Vector3.h>
 
#define SIGNCURVATUREXY_NAME SignCurvatureXY
 
namespace Belle2 {
  template <typename PointType >
  class SIGNCURVATUREXY_NAME : public SelectionVariable< PointType, 3, int > {
  public:
 
    PUT_NAME_FUNCTION(SIGNCURVATUREXY_NAME);
 
    static int value(const PointType& a, const PointType& b, const PointType& c)
    {
      using boost::math::sign;
      B2Vector3D ba(a.X() - b.X(), a.Y() - b.Y(), 0.0);
      B2Vector3D bc(b.X() - c.X(), b.Y() - c.Y(), 0.0);
      return sign(bc.Orthogonal() * ba); //normal vector of m_vecBC times segment of ba
    }
  };
 
}