ZiggZaggXY.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/SignCurvatureXY.h>
 
#include <vector>
#include <algorithm>
 
#define ZIGGZAGGXY_NAME ZiggZaggXY
 
namespace Belle2 {
  template <typename PointType, typename PointContainerType >
  class ZIGGZAGGXY_NAME : public SelectionVariable< PointContainerType, 0, int > {
  public:
    PUT_NAME_FUNCTION(ZIGGZAGGXY_NAME);
 
 
    static int value(const PointContainerType& hitContainer)
    {
      if (hitContainer.size() < 4) return 1;
 
      std::vector<int> chargeSigns;
      chargeSigns.reserve(hitContainer.size() - 2);
 
      auto iterPos = hitContainer.begin();
      auto stopPos = hitContainer.end() - 2;
 
      for (; iterPos < stopPos; ++iterPos) {
        int signVal = SignCurvatureXY<PointType>::value(**iterPos, **(iterPos + 1), **(iterPos + 2));
        chargeSigns.push_back(signVal);
      }
 
      std::sort(chargeSigns.begin(), chargeSigns.end());
      auto newEnd = std::unique(chargeSigns.begin(), chargeSigns.end());
 
      return std::distance(chargeSigns.begin(), newEnd);
    } // return unit: none
  };
 
}