ZiggZaggXY.h

/**************************************************************************
* BASF2 (Belle Analysis Framework 2)                                     *
* Copyright(C) 2014 - Belle II Collaboration                             *
*                                                                        *
* Author: The Belle II Collaboration                                     *
* Contributors: Jakob Lettenbichler (jakob.lettenbichler@oeaw.ac.at)     *
*                                                                        *
* This software is provided "as is" without any warranty.                *
**************************************************************************/
 
#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
  };
 
}