-- Created on: 1997-05-28
-- Created by: Xavier BENVENISTE
-- Copyright (c) 1997-1999 Matra Datavision
-- Copyright (c) 1999-2012 OPEN CASCADE SAS
--
-- The content of this file is subject to the Open CASCADE Technology Public
-- License Version 6.5 (the "License"). You may not use the content of this file
-- except in compliance with the License. Please obtain a copy of the License
-- at http://www.opencascade.org and read it completely before using this file.
--
-- The Initial Developer of the Original Code is Open CASCADE S.A.S., having its
-- main offices at: 1, place des Freres Montgolfier, 78280 Guyancourt, France.
--
-- The Original Code and all software distributed under the License is
-- distributed on an "AS IS" basis, without warranty of any kind, and the
-- Initial Developer hereby disclaims all such warranties, including without
-- limitation, any warranties of merchantability, fitness for a particular
-- purpose or non-infringement. Please see the License for the specific terms
-- and conditions governing the rights and limitations under the License.




class CheckBSplineCurve from GeomLib

	---Purpose: this class is used to  construct the BSpline curve
	--          from an Approximation ( ApproxAFunction from AdvApprox).
    	

uses
    Pnt	            from gp,
    BSplineCurve    from Geom,
    BSplineCurve    from Geom2d

raises

    NotDone    from StdFail,
    OutOfRange from Standard
    
is

    Create( Curve : BSplineCurve from Geom ;
    	    Tolerance        : Real from Standard ;
            AngularTolerance : Real from Standard) 
    returns CheckBSplineCurve from GeomLib;
    
    IsDone(me) returns Boolean from Standard
	---C++: inline
    is static;
    
    NeedTangentFix(me; FirstFlag : in out Boolean from Standard ;
    	         SecondFlag : in out Boolean from Standard) ;
    FixTangent  (me : in out ; FirstFlag : Boolean from Standard ;
              		       LastFlag  : Boolean from Standard)  ;	 
	
    FixedTangent  (me : in out ; FirstFlag : Boolean from Standard ;
              		       LastFlag  : Boolean from Standard) 
    ---Purpose:  modifies the curve
    -- by fixing the first or the last tangencies 
    -- 
    returns BSplineCurve from Geom
    raises
    	OutOfRange from Standard,
    	---Purpose: if Index3D not in the Range [1,Nb3dSpaces]
	NotDone    from StdFail
	---Purpose: if the Approx is not Done
    is static;
 

fields

    myCurve            : BSplineCurve from Geom ;
    myDone             : Boolean from Standard ;
    myFixFirstTangent  : Boolean from Standard ;
    myFixLastTangent   : Boolean from Standard ;
    myAngularTolerance : Real from Standard ;
    myTolerance        : Real from Standard ;
    myFirstPole        : Pnt from gp ;
    	-- the second pole that controls first tangency
    myLastPole         : Pnt from gp ;
    	-- the before last pole that controls last tangency

end CheckBSplineCurve;