PCASeedFinderAlg.h

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/**
 *  @file   PCASeedFinderAlg.h
 *
 *  @brief  This is an algorithm for finding recob::Seed objects in 3D clusters
 *
 */
#ifndef PCASeedFinderAlg_h
#define PCASeedFinderAlg_h

// Framework Includes
namespace fhicl { class ParameterSet; }

// LArSoft includes
#include "larreco/RecoAlg/Cluster3DAlgs/Cluster3D.h"
#include "larreco/RecoAlg/Cluster3DAlgs/PrincipalComponentsAlg.h"
#include "larreco/RecoAlg/Cluster3DAlgs/SeedFinderAlgBase.h"
namespace geo {
  class Geometry;
}

// ROOT includes
class TVector3;

//------------------------------------------------------------------------------------------------------------------------------------------

namespace lar_cluster3d {

  /**
 *  @brief  PCASeedFinderAlg class
 */
  class PCASeedFinderAlg final : public SeedFinderAlgBase {
  public:
    /**
     *  @brief  Constructor
     *
     *  @param  pset
     */
    PCASeedFinderAlg(fhicl::ParameterSet const& pset);

    /**
     *  @brief Given the list of hits this will search for candidate Seed objects and return them
     */
    bool findTrackSeeds(reco::HitPairListPtr& hitPairListPtr,
                        reco::PrincipalComponents& inputPCA,
                        SeedHitPairListPairVec& seedHitMap) const override;

  private:
    /**
     *  @brief Separate function to find hits at the ends of the input hits
     */
    bool getHitsAtEnd(reco::HitPairListPtr& hit3DList, reco::PrincipalComponents& seedPca) const;

    void LineFit2DHits(const reco::HitPairListPtr& hitList,
                       double XOrigin,
                       TVector3& Pos,
                       TVector3& Dir,
                       double& ChiDOF) const;

    geo::Geometry const* m_geometry; // pointer to the Geometry service

    double m_gapDistance;      ///<
    size_t m_numSeed2DHits;    ///<
    double m_minAllowedCosAng; ///< The minimum cos(ang) between input and seed axes

    PrincipalComponentsAlg m_pcaAlg; // For running Principal Components Analysis
  };

} // namespace lar_cluster3d
#endif