-- File:	GeomConvert_ApproxSurface.cdl
-- Created:	Tue Aug 26 10:44:03 1997
-- Author:	Stepan MISHIN
--		<smn@toctox.nnov.matra-dtv.fr>
---Copyright:	 Matra Datavision 1997


class ApproxSurface from GeomConvert 

        ---Purpose: A framework to convert a surface to a BSpline
    	-- surface. This is done by approximation to a BSpline
    	-- surface within a given tolerance.
        
uses 

    Pnt             from gp,
    Surface         from Geom,
    OffsetSurface   from Geom,
    BSplineSurface  from Geom, 
    Shape           from GeomAbs,     
    ApproxAFunc2Var from AdvApp2Var, 
    OutOfRange      from Standard 
    
raises OutOfRange from Standard

is
    
    Create(Surf: Surface from Geom;
    	   Tol3d: Real; 
           UContinuity : Shape from GeomAbs;
           VContinuity : Shape from GeomAbs;
           MaxDegU : Integer;
       	   MaxDegV : Integer;	   
    	   MaxSegments: Integer; 
	   PrecisCode : Integer) returns ApproxSurface ;
    	---Purpose: Constructs a surface approximation framework defined by
    	-- -   the conic Surf
    	-- -   the tolerance value Tol3d
    	-- -   the degree of continuity UContinuity, VContinuity
    	--  in the directions of the U and V parameters
    	-- -   the highest degree MaxDegU, MaxDegV which
    	--   the polynomial defining the BSpline curve may
    	--   have in the directions of the U and V parameters
    	-- -   the maximum number of segments MaxSegments
    	--   allowed in the resulting BSpline curve
    	-- -   the index of precision PrecisCode.  


    Surface(me)   returns BSplineSurface from Geom;
    	---Purpose: Returns the BSpline surface resulting from the approximation algorithm.
    

    IsDone(me)    returns  Boolean  from  Standard; 
    	--- Purpose: Returns Standard_True if the approximation has be done
      
    HasResult(me) returns Boolean;
    	--- Purpose: Returns true if the approximation did come out with a result that
    	--  is not NECESSARILY within the required tolerance or a result
    	--  that is not recognized with the wished continuities. 
    
    MaxError(me)  returns Real  from  Standard;
    	--- Purpose: Returns the greatest distance between a point on the
    	-- source conic surface and the BSpline surface
    	-- resulting from the approximation (>0 when an approximation
        --   has been done, 0 if no  approximation )
     
    Dump(me ; o : in out OStream);
    	---Purpose: Prints on the stream o informations on the current state of the object.
             
fields
 
    mySurf     : Surface         from Geom;
    myIsDone   : Boolean         from Standard; 
    myHasResult: Boolean         from Standard; 
    myBSplSurf : BSplineSurface  from Geom; 
    myMaxError : Real            from Standard;
end;