#ifndef TRAPEZOID_HH
#define TRAPEZOID_HH
//=============================================================================
//
//    Class       : Trapezoid
//    Created     : 4-DEC-1997 by Stephen Kahn
//    Purpose     : Characterize a GeometryElement as a TRD1 or TRD2 shape
//                  Components are inner_half_width
//                                 outer_half_width
//                                 inner_half_length
//                                 outer_half_length
//                                 half_height
//                  If outer_half_length == inner_half_length or 
//                  outer_half_length < 0 we have TRD1
//
//=============================================================================

#include <iostream>
#include <geometry_system/components/GeometryElement.hpp>
#include <geometry_system/components/CartesianCoordinate.hpp>

namespace dgs {
///  A trapezoid.
class  Trapezoid : public GeometryElement
{	
private :

  ///  Inner half-width.
  double _inner_half_width;
  ///  Outer half-width.
  double _outer_half_width;
  ///  Inner half-length
  double _inner_half_length;
  ///  Outer half-length
  double _outer_half_length;
  ///  Half-height
  double _half_height;
  /// Support for positioning children.
  CartesianCoordinate xform_to_local(const GeometryXform& )const;
  /// Support for positioning children.
  GeometryXform local_to_xform(const CartesianCoordinate& )const;

  /// Nominal Global position 
  CartesianCoordinate  _TrapCenter;

  ///  Inner edge
  CartesianCoordinate  _inner_edge;

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

public :

  ///  Default constructor
  Trapezoid(): _cvers("$Revision: 1.9 $") {}

  ///  Fill trapezoid.
  void fill_Trapezoid( double dxi, double dxo, double dzi, 
		       double dzo, double dh) ;

  ///  Get inner half-width.
  double  get_inner_half_width() const;
  ///  Get outer half-width.
  double  get_outer_half_width() const;
  ///  Get inner half-length.
  double  get_inner_half_length() const;
  ///  Get outer half-length.
  double  get_outer_half_length() const;
  ///  Get half-height.
  double  get_half_height() 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 center of trapezoid to specified Cartesian point.
  void  set_center_xyz( double, double, double);
  void  set_center_xyz();

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

  ///  Position child surface a specified local point.
  bool  position_child_at( const CartesianCoordinate& , GeometryElement& );
  bool  position_child_at( const GeometryXform&, GeometryElement& );

  ///  Get center of trapezoid.
  CartesianCoordinate  get_center() const;

  D0_OBJECT_SETUP(Trapezoid);  // persistent class
};
//#include <geometry_system/components/Trapezoid.icc>
}
#endif // TRAPEZOID_HH