Seed.h

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//
// \brief 3D seed object for kalman tracking and
//           bezier tracking
//
// \author Ben Jones, MIT
//         bjpjones@mit.edu
//

#ifndef SEED_H
#define SEED_H

#include <iosfwd>

namespace recob {

  class SpacePoint;

  class Seed {
  public:
    // Basic constructors
    Seed();

  private:
    double fSeedPoint[3];
    double fSeedDirection[3];
    double fSeedPointError[3];
    double fSeedDirectionError[3];
    bool fIsValid;

  public:
    Seed(double* Pt, double* Dir, double* PtErr, double* DirErr);

    // Getters and setters
    void GetDirection(double* Dir, double* Err) const;
    void GetPoint(double* Pt, double* Err) const;
    double GetLength() const;

    void Print() const;

    void SetDirection(double* Dir, double* Err);
    void SetPoint(double* Pt, double* Err);

    double GetAngle(Seed const& AnotherSeed) const;
    double GetProjDiscrepancy(Seed const& AnotherSeed) const;
    double GetProjAngleDiscrepancy(Seed const& AnotherSeed) const;
    double GetDistance(Seed const& AnotherSeed) const;

    Seed Reverse();
    void GetVectorBetween(Seed const& AnotherSeed, double* xyz) const;

    double GetDistanceFrom(SpacePoint const& SomePoint) const;

    int GetPointingSign(Seed const& AnotherSeed) const;

    // Methods for errorless seeds
    Seed(double* Pt, double* Dir);
    void SetDirection(double* Dir);
    void SetPoint(double* Pt);

    // Seed validity checks
    bool IsValid() const;
    void SetValidity(bool Validity);

    friend std::ostream& operator<<(std::ostream& stream, Seed const& a);

    friend bool operator<(const Seed& a, const Seed& b);
  };

  void CrossProd(double, double, double, double, double, double, double&, double&, double&);
}

#endif // SEED_H