1 -- Created on: 1991-10-10
2 -- Created by: Jean Claude VAUTHIER
3 -- Copyright (c) 1991-1999 Matra Datavision
4 -- Copyright (c) 1999-2014 OPEN CASCADE SAS
6 -- This file is part of Open CASCADE Technology software library.
8 -- This library is free software; you can redistribute it and / or modify it
9 -- under the terms of the GNU Lesser General Public version 2.1 as published
10 -- by the Free Software Foundation, with special exception defined in the file
11 -- OCCT_LGPL_EXCEPTION.txt. Consult the file LICENSE_LGPL_21.txt included in OCCT
12 -- distribution for complete text of the license and disclaimer of any warranty.
14 -- Alternatively, this file may be used under the terms of Open CASCADE
15 -- commercial license or contractual agreement.
17 class ParabolaToBSplineCurve from Convert inherits ConicToBSplineCurve
20 -- This algorithm converts a parabola into a non rational B-spline
22 -- The parabola is a Parab2d from package gp with the parametrization
23 -- P (U) = Loc + F * (U*U * Xdir + 2 * U * Ydir) where Loc is the
24 -- apex of the parabola, Xdir is the normalized direction of the
25 -- symmetry axis of the parabola, Ydir is the normalized direction of
26 -- the directrix and F is the focal length.
28 -- Convert, Parabola, BSplineCurve, 2D .
35 Create (Prb : Parab2d; U1, U2 : Real) returns ParabolaToBSplineCurve;
37 -- The parabola Prb is limited between the parametric values U1, U2
38 -- and the equivalent B-spline curve as the same orientation as the
42 end ParabolaToBSplineCurve;