-- File:	GeomFill_BezierCurves.cdl
-- Created:	Wed Oct  6 10:30:09 1993
-- Author:	Bruno DUMORTIER
--		<dub@sdsun1>
---Copyright:	 Matra Datavision 1993


class BezierCurves from GeomFill

	---Purpose: This class provides an algorithm for constructing a Bezier surface filled from
    	-- contiguous Bezier curves which form its boundaries.
    	-- The algorithm accepts two, three or four Bezier curves
    	-- as the boundaries of the target surface.
    	-- A range of filling styles - more or less rounded, more or less flat - is available.
    	-- A BezierCurves object provides a framework for:
    	-- -   defining the boundaries, and the filling style of the surface
    	-- -   implementing the construction algorithm
    	-- -   consulting the result.
    	-- Warning
    	-- Some problems may show up with rational curves.

uses
    BezierCurve    from Geom,
    BezierSurface  from Geom,
    FillingStyle  from GeomFill

raises
    ConstructionError from Standard

is
    Create;
    	--- Purpose: Constructs an empty framework for building a Bezier
    	-- surface from contiguous Bezier curves.
    	-- You use the Init function to define the boundaries of the surface.   
    Create( C1, C2, C3, C4 : BezierCurve   from Geom;
    	    Type           : FillingStyle from GeomFill)
    returns BezierCurves from GeomFill;
    	---Purpose: Constructs a framework for building a Bezier surface
    	-- from the four contiguous Bezier curves, C1, C2, C3 and C4
    	-- Raises Standard_ConstructionError if the curves are not contiguous.   
    
    Create( C1, C2, C3 : BezierCurve   from Geom;
    	    Type       : FillingStyle from GeomFill)
    returns BezierCurves from GeomFill;
    	---Purpose: Constructs a framework for building a Bezier surface
    	-- from the three contiguous Bezier curves, C1, C2 and C3
    	-- Raises Standard_ConstructionError if the curves are not contiguous.     
    Create( C1, C2 : BezierCurve   from Geom;
    	    Type   : FillingStyle from GeomFill)
    returns BezierCurves from GeomFill;
    	---Purpose: Constructs a framework for building a Bezier surface
    	-- from the two contiguous Bezier curves, C1 and C2
    	-- Raises Standard_ConstructionError if the curves are not contiguous.        
    Init( me : in out;
    	  C1, C2, C3, C4 : BezierCurve   from Geom;
    	  Type           : FillingStyle from GeomFill)
    raises
    	ConstructionError from Standard
	---Purpose: if the curves cannot be joined
    is static;
    
    Init( me : in out;
          C1, C2, C3 : BezierCurve   from Geom;
    	  Type       : FillingStyle from GeomFill)
    raises
    	ConstructionError from Standard
	---Purpose: if the curves cannot be joined
    is static;
    
    Init( me : in out;
          C1, C2 : BezierCurve   from Geom;
          Type   : FillingStyle from GeomFill)
    is static;
    	---Purpose: Initializes or reinitializes this algorithm with two, three,
    	-- or four curves - C1, C2, C3, and C4 - and Type, one
    	-- of the following filling styles:
    	-- -   GeomFill_Stretch - the style with the flattest patch
    	-- -   GeomFill_Coons - a rounded style of patch with
    	--   less depth than that of Curved
    	-- -   GeomFill_Curved - the style with the most rounded patch.
    	--  Exceptions
    	-- Standard_ConstructionError if the curves are not contiguous.    
    Surface(me) returns BezierSurface from Geom
    	---Purpose: Returns the Bezier surface resulting from the
    	-- computation performed by this algorithm.
    	---C++: return const&
    	---C++: inline
    is static;
    
fields

    mySurface : BezierSurface from Geom;
    
end BezierCurves;