1 -- Created on: 1991-10-10
2 -- Created by: Jean Claude VAUTHIER
3 -- Copyright (c) 1991-1999 Matra Datavision
4 -- Copyright (c) 1999-2012 OPEN CASCADE SAS
6 -- The content of this file is subject to the Open CASCADE Technology Public
7 -- License Version 6.5 (the "License"). You may not use the content of this file
8 -- except in compliance with the License. Please obtain a copy of the License
9 -- at http://www.opencascade.org and read it completely before using this file.
11 -- The Initial Developer of the Original Code is Open CASCADE S.A.S., having its
12 -- main offices at: 1, place des Freres Montgolfier, 78280 Guyancourt, France.
14 -- The Original Code and all software distributed under the License is
15 -- distributed on an "AS IS" basis, without warranty of any kind, and the
16 -- Initial Developer hereby disclaims all such warranties, including without
17 -- limitation, any warranties of merchantability, fitness for a particular
18 -- purpose or non-infringement. Please see the License for the specific terms
19 -- and conditions governing the rights and limitations under the License.
24 class ParabolaToBSplineCurve from Convert inherits ConicToBSplineCurve
27 -- This algorithm converts a parabola into a non rational B-spline
29 -- The parabola is a Parab2d from package gp with the parametrization
30 -- P (U) = Loc + F * (U*U * Xdir + 2 * U * Ydir) where Loc is the
31 -- apex of the parabola, Xdir is the normalized direction of the
32 -- symmetry axis of the parabola, Ydir is the normalized direction of
33 -- the directrix and F is the focal length.
35 -- Convert, Parabola, BSplineCurve, 2D .
42 Create (Prb : Parab2d; U1, U2 : Real) returns ParabolaToBSplineCurve;
44 -- The parabola Prb is limited between the parametric values U1, U2
45 -- and the equivalent B-spline curve as the same orientation as the
49 end ParabolaToBSplineCurve;