// ThinCylMS.h

#ifndef ThinCylMS_H
#define ThinCylMS_H

// Class for modifying the covariance matrix of a track which
// has been propagated to an InteractingLayer containing 
// a LayerCylinder.
//
// ObjStream example:
//
// [ myint ThinCylMS rad_length=0.00123 ]
//

#include "trfbase/Interactor.h"

namespace trf {

class ETrack;

class ThinCylMS : public Interactor {

public:  // static methods

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

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

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

private:

  double _rad_length;

public:
  
  // constructor.  The Interactor is constructed with the 
  // ppropriate number of radiation lengths.
  ThinCylMS(double rad_length);

  // destructor
  ~ThinCylMS();

  // make a clone of this object
  Interactor* new_copy() const{ return new ThinCylMS(*this); }

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

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

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

  // return the number of radiation lengths:
  double get_rad_length() const { return _rad_length; }

};

}  // end namespace trf

#endif