SpacePoint.h

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//
// Definition of SpacePoint class for LArSoft
//
// SpacePoints are 3D objects that contain pointers to Hits from multiple
// wireplanes that have been identified as matching.
//
// msoderbe@syr.edu
//

#ifndef SPACEPOINT_H
#define SPACEPOINT_H

#include <iosfwd>

#include "larcoreobj/SimpleTypesAndConstants/PhysicalConstants.h"
#include "larcoreobj/SimpleTypesAndConstants/geo_vectors.h"
#include <RtypesCore.h>

namespace recob {

  class SpacePoint {

  public:
    using ID_t = int; 

    static constexpr ID_t InvalidID = util::kBogusI;

    SpacePoint(); 

  private:
    ID_t fID;              
    Double32_t fXYZ[3];    
    Double32_t fErrXYZ[6]; 
    Double32_t fChisq;     

  public:
    SpacePoint(Double32_t const* xyz, Double32_t const* err, Double32_t chisq, int id = InvalidID);

    ID_t ID() const;
    const Double32_t* XYZ() const;
    const Double32_t* ErrXYZ() const;
    Double32_t Chisq() const;

    geo::Point_t position() const;

    double covariance(unsigned int i, unsigned int j) const;

    static constexpr std::size_t covIndex(unsigned int i, unsigned int j);

    friend std::ostream& operator<<(std::ostream& o, const SpacePoint& a);
    friend bool operator<(const SpacePoint& a, const SpacePoint& b);
  };

  inline bool operator<(SpacePoint const& s, SpacePoint::ID_t id)
  {
    return s.ID() < id;
  }
  inline bool operator<(SpacePoint::ID_t id, SpacePoint const& s)
  {
    return id < s.ID();
  }

}

inline recob::SpacePoint::ID_t recob::SpacePoint::ID() const
{
  return fID;
}
inline const Double32_t* recob::SpacePoint::XYZ() const
{
  return fXYZ;
}
inline const Double32_t* recob::SpacePoint::ErrXYZ() const
{
  return fErrXYZ;
}
inline Double32_t recob::SpacePoint::Chisq() const
{
  return fChisq;
}

inline geo::Point_t recob::SpacePoint::position() const
{
  return geo::Point_t{fXYZ[0], fXYZ[1], fXYZ[2]};
}

#endif //SPACEPOINT_H