-- File:	BRepBuilderAPI_MakeShell.cdl
-- Created:	Wed Feb 16 16:56:46 1994
-- Author:	Remi LEQUETTE
--		<rle@zerox>
--		xab:19Nov96 correction de doc
---Copyright:	 Matra Datavision 1994



class MakeShell from BRepBuilderAPI inherits MakeShape from BRepBuilderAPI

	---Purpose: Describes functions to build a
    	-- shape corresponding to the skin of a surface.
    	-- Note that the term shell in the class name has the same definition
    	-- as that of a shell in STEP, in other words the skin of a shape,
    	-- and not a solid model defined by surface and thickness. If you want
    	-- to build the second sort of shell, you must use
    	-- BRepOffsetAPI_MakeOffsetShape. A shell is made of a series of
    	-- faces connected by their common edges.
    	-- If the underlying surface of a face is not C2 continuous and 
    	-- the flag Segment is True, MakeShell breaks the surface down into
    	-- several faces which are all C2 continuous and which are
    	-- connected along the non-regular curves on the surface.
    	-- The resulting shell contains all these faces.
    	-- Construction of a Shell from a non-C2 continuous Surface
    	-- A MakeShell object provides a framework for:
    	-- -      defining the construction of a shell,
    	-- -      implementing the construction algorithm, and
    	-- -      consulting the result.
    	-- Warning
    	-- The connected C2 faces in the shell resulting from a decomposition of
    	-- the surface are not sewn. For a sewn result, you need to use
    	-- BRepOffsetAPI_Sewing. For a shell with thickness, you need to use
    	-- BRepOffsetAPI_MakeOffsetShape.
        
uses

    Surface    from Geom,
    Shell      from TopoDS,
    Face       from TopoDS,
    ShellError from BRepBuilderAPI,
    MakeShell  from BRepLib
    

raises
    NotDone from StdFail

is
    Create  
	---Purpose: Constructs an empty shell framework. The Init
    	-- function is used to define the construction arguments.
    	-- Warning
    	-- The function Error will return
    	-- BRepBuilderAPI_EmptyShell if it is called before the function Init.
    returns MakeShell from BRepBuilderAPI;
    
    ----------------------------------------------
    -- From a set of face
    ----------------------------------------------

    ----------------------------------------------
    -- From a surface
    ----------------------------------------------

    Create(S : Surface from Geom;
    	   Segment : Boolean from Standard = Standard_False)
	---Purpose: Constructs a shell from the surface S.
    returns MakeShell from BRepBuilderAPI;
    
    Create(S : Surface from Geom; UMin, UMax, VMin, VMax : Real;
       	   Segment : Boolean from Standard = Standard_False)

	---Purpose: Constructs a shell from the surface S,
    	--      limited in the u parametric direction by the two
    	--      parameter values UMin and UMax, and limited in the v
    	--      parametric direction by the two parameter values VMin and VMax.
    returns MakeShell from BRepBuilderAPI;

    Init(me : in out; S : Surface from Geom; UMin, UMax, VMin, VMax : Real;
       	              Segment : Boolean from Standard = Standard_False)
    	---Purpose: Defines or redefines the arguments
    	-- for the construction of a shell. The construction is initialized
    	-- with the surface S, limited in the u parametric direction by the
    	-- two parameter values UMin and UMax, and in the v parametric
    	-- direction by the two parameter values VMin and VMax.
    	-- Warning
    	-- The function Error returns:
    	-- -      BRepBuilderAPI_ShellParametersOutOfRange
    	--    when the given parameters are outside the bounds of the
    	--    surface or the basis surface if S is trimmed
    is static;


    ----------------------------------------------
    -- Results
    ----------------------------------------------

    IsDone(me) returns Boolean
	---Purpose: Returns true if the shell is built.
    is redefined;

    Error(me) returns ShellError from BRepBuilderAPI
	---Purpose: Returns the construction status:
    	-- -   BRepBuilderAPI_ShellDone if the shell is built, or
    	-- -   another value of the BRepBuilderAPI_ShellError
    	--   enumeration indicating why the construction failed.
    	--   This is frequently BRepBuilderAPI_ShellParametersOutOfRange
    	-- indicating that the given parameters are outside the bounds of the surface.
    is static;

    Shell(me) returns Shell from TopoDS
	---Purpose: Returns the new Shell.
	--          
	---C++: return const &
	---C++: alias "Standard_EXPORT operator TopoDS_Shell() const;"
	---Level: Public
    raises
    	NotDone from StdFail
    is static; 
    
fields
    myMakeShell : MakeShell from BRepLib;

end MakeShell;