// ETrackGenerator.hpp

#ifndef ETrackGenerator_H
#define ETrackGenerator_H

// Generates ETrack objects with parameters drawn randomly
// from a flat distribution in the parameter space.
// The track surface and the ranges for the parameters are
// specified in the constructor.

#include "trfbase/VTrackGenerator.h"
#include "trfbase/Surface.h"
#include "trfbase/SurfacePtr.h"
#include "trfutil/RandomGenerator.h"
#include "trfbase/TrackVector.h"
#include "trfbase/VTrack.h"
#include "trfbase/ETrack.h"
#include "trffit/HTrackGenerator.h"
#include "trfbase/HitGenerator.h"
#include "ETrackGeneratorLimits.hpp"

// class ETrack;

class ETrackGenerator : public trf::VTrackGenerator {

private:  // attributes

  // min and max values for each parameter.
  trf::TrackError _emin,_emax;

public:

  // constructors

  // ...with quick and easy limits
  ETrackGenerator(const trf::SurfacePtr srf, 
                  const ETrackGeneratorLimits etgLimits);

  // ...with manual limits, but otherwise as above
  ETrackGenerator(const trf::SurfacePtr srf,
    const trf::TrackVector& min,  const trf::TrackVector& max,
    const trf::TrackError& emin,  const trf::TrackError& emax);

  // note that only the diagonals of the TrackError matrix
  // will limit the result, the off-diagonals will be functions
  // of the diagonals.

  // destructor
  ~ETrackGenerator() {};

  // Generate a new track.  User must delete.
  trf::ETrack* new_track();

};

  using std::sqrt; // needed for error matrix generation
#endif