// ThinZPlaneMS.h

#ifndef ThinZPlaneMS_H
#define ThinZPlaneMS_H

#include "trfbase/Interactor.h"

// Class for modifying the covariance matrix of a track to
// account for multiple scattering at a Z-plane.

namespace trf {

class ETrack;

class ThinZPlaneMS : public Interactor {

public:  // static methods

  // Return the type name.
  static TypeName get_type_name() { return "ThinZPlaneMS"; }

  // Return the creator.
  static ObjCreator get_creator();

  // Return the type.
  static Type get_static_type() { return get_creator(); }

public:

  // Constructor.  The Interactor is constructed with the
  // ppropriate number of radiation lengths.
  ThinZPlaneMS( double radLength );

  // destructor
  ~ThinZPlaneMS();

   // method for adding the interaction
  void interact(ETrack& tre) const;

  // return the number of radiation lengths
  double get_rad_length() const;

  // make a clone of this object
  Interactor* new_copy() const;

  // Return the type.
  Type get_type() const { return get_static_type(); }

  // Write the object data.
  ObjData write_data() const;


private:
  double _radLength;

};

}  // end namespace trf

#endif