#ifndef  POLYVOL_HH
#define  POLYVOL_HH
#include <geometry_system/components/GeometryElement.hpp>
#include <geometry_system/components/CartesianCoordinate.hpp>

namespace dgs {
/// A generalized polygon.
class  PolyVol :  public  GeometryElement
{  
private :
  /// number of sides in x-y plane 
  int _numberSides;
  /// half width along local z-direction
  double  _dz;
  /// half lengths of sides in x-y plane
  double  _halfLengths[10];
  /// angles of sides in local x-y plane
  double  _angles[10]; 

  /// position of volume corner at (0,0) in local x-y coord.
  CartesianCoordinate  _volPos;

  /// Support for positioning children.
  CartesianCoordinate  xform_to_local(const GeometryXform&) const;
		
  /// Support for positioning children.
  GeometryXform  local_to_xform(const CartesianCoordinate&) const;

  /// RCS version
  std::string _cvers;  // Replaced at checkout

public :

  ///  Default constructor.
  PolyVol(): _cvers("Revision:$") {}

  ///  Fill volume
  void fill_Vol(int ns, double dz, double hl[10], double ang[10]);
		
  /// returns number of sides
  int get_number_sides() const;
  ///  resturns half width
  double  get_dz() const;
  /// returns half lengths
  void get_half_lengths(double *half_lengths) const;
  /// returns angles
  void get_angles(double *angles) const;
 
  ///  Convert local point to global one.
  SpacePoint local_to_global( const CartesianCoordinate&) const;

  ///  Convert global point to local one.
  CartesianCoordinate global_to_local(const SpacePoint&) const;

  ///  Set corner of volume to specified Cartesian point.
  void  set_corner_xyz();

  ///  Set Xform.
  void  set_Xform(double, double, double, double);

  ///  Position child surface at specfied local point.
  bool  position_child_at( const CartesianCoordinate& ,
			   GeometryElement& );

  ///  Get position of volume.
  CartesianCoordinate get_corner() const { return _volPos;}
  
  /// Get source code version. Kept to allow following code changes
  const std::string& code_version() const { return _cvers; }

  D0_OBJECT_SETUP(PolyVol);    // persistent class	
};
}
#endif  // POLYVOL_HH