//*****************************************************
// Class : TrackConversion.hpp
// 
// Author: M. Narain - F. Stichelbaut
//
// Date  : 16-APR-1998
//         23-APR-1998 : Modify arguments of TrackConvertEtoI.
//         12-AUG-1998 : Conversion in the constructor.
//*****************************************************
#ifndef  TRACKCONVERSION_H
#define  TRACKCONVERSION_H

#include "LinearAlgebra/Matrix.h"
#include "trfbase/ETrack.h"

/** Track conversion class.
    This class is used to convert the track parameters from their 
    external format ({\bf ETrack}) to their internal format ({\bf ITrack})
    which is used by the {\em valgimp} package. The new error matrix
    is also provided. The {\bf ETrack} object contains the track at the
    distance of closest approach wrt the origin, 
    defined by the parameters: $\epsilon^d$, $\epsilon_z$, $\phi_{direction}$,
     $\tan\theta$ and $q/p_T$. The internal parameters are: 
    $x_c$, $y_c$, $z_c$, $R$ and $\cot(\theta)$.
    @see ETrack, ITrack */

namespace vertex {

class TrackConversion {

public: 

     /**@name   Methods   */
     //@{

     /** Constructor.
         This constructor is used to do the conversion from external to
         internal format. This internal parameterization is returned into
         the arguments {\bf itrack, eitrack} and {\bf phi\_pos}. */

     TrackConversion(const ETrack& my_etrack, ColumnVector& itrack,
                     Matrix& eitrack, double& phi_pos);
     /// Destructor
     ~TrackConversion();

     //@}
};

}
#endif