#ifndef __DRCSURFCYL_H__
#define __DRCSURFCYL_H__

/*! 
  \brief Representation of a cylinder surface
*/

class DrcSurfCyl : public DrcSurfAbs
{
 private:

//!                                               First point of cylinder axis
  XYZPoint m_p1;                        
//!                                               Second point of cylinder axis
  XYZPoint m_p2;                        
//!                                               Radius of cylinder.
  double   m_radius;                    




 private:
  /*! \brief Auxiliary function for assignment operator and copy constructor..
    \param s The object to copy.
  */
  void copy(const DrcSurfCyl& s);         


 public:

  DrcSurfCyl();                    //!< Empty constructor.

  /*! \brief Copy constructor.
    \param s Object to copy.
  */
  DrcSurfCyl(const DrcSurfCyl& s);

  /*! \brief Assignment operator.
    \param s Object to assign.
  */
  DrcSurfCyl& operator=(const DrcSurfCyl& s);


  /*! \brief Add a surface boundary point.
    \param r1 First point of cylinder axis.
    \param r2 Second point of cylinder axis.
    \param radius Radius of cylinder.
  */
  void     set(XYZPoint r1, XYZPoint r2, double radius);       


  // implemetation of pure virtual functions.
  virtual  DrcSurfCyl* clone() const;
  XYZVector normal(const XYZPoint& point)   const; 
  bool     surfaceHit(DrcPhoton& ph, 
		      XYZPoint&  pos_new, 
		      double&    path_length) const;
  void     print(fstream& stream)          const;
  void     addTransform(const Transform3D& trans);
  virtual bool isFlat(){return false;};


};
#endif