-- File:	Geom_SweptSurface.cdl
-- Created:	Wed Mar 10 10:54:18 1993
-- Author:	JCV
--		<fid@phylox>
-- Copyright:	 Matra Datavision 1993


deferred class SweptSurface from Geom inherits Surface from Geom 

        ---Purpose : Describes the common behavior for surfaces
    	-- constructed by sweeping a curve with another curve.
    	-- The Geom package provides two concrete derived
    	-- surfaces: surface of revolution (a revolved surface),
    	-- and surface of linear extrusion (an extruded surface).
       

uses Dir         from gp,
     Curve       from Geom,
     Shape       from GeomAbs

is


  Continuity (me)   returns Shape from GeomAbs;
        ---Purpose :
        --  returns the continuity of the surface : 
        --  C0 : only geometric continuity,
        --  C1 : continuity of the first derivative all along the surface,
        --  C2 : continuity of the second derivative all along the surface,
        --  C3 : continuity of the third derivative all along the surface,
        --  G1 : tangency continuity all along the surface,
        --  G2 : curvature continuity all along the surface,
        --  CN : the order of continuity is infinite.


  Direction (me)  returns Dir;
        ---Purpose :
        --  Returns the reference direction of the swept surface.
        --  For a surface of revolution it is the direction of the 
        --  revolution axis, for a surface of linear extrusion it is 
        --  the direction of extrusion.
    	---C++: return const&


  BasisCurve (me)  returns Curve from Geom;
        ---Purpose :
        --  Returns the referenced curve of the surface.
        --  For a surface of revolution it is the revolution curve,
        --  for a surface of linear extrusion it is the extruded curve.


fields

  basisCurve : Curve       from Geom    is protected;
  direction  : Dir         from gp      is protected;
  smooth     : Shape       from GeomAbs is protected;


end;