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 under
9 // the terms of the GNU Lesser General Public License 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 #ifndef _Convert_ParabolaToBSplineCurve_HeaderFile
18 #define _Convert_ParabolaToBSplineCurve_HeaderFile
20 #include <Standard.hxx>
21 #include <Standard_DefineAlloc.hxx>
22 #include <Standard_Handle.hxx>
24 #include <Convert_ConicToBSplineCurve.hxx>
25 #include <Standard_Real.hxx>
30 //! This algorithm converts a parabola into a non rational B-spline
32 //! The parabola is a Parab2d from package gp with the parametrization
33 //! P (U) = Loc + F * (U*U * Xdir + 2 * U * Ydir) where Loc is the
34 //! apex of the parabola, Xdir is the normalized direction of the
35 //! symmetry axis of the parabola, Ydir is the normalized direction of
36 //! the directrix and F is the focal length.
38 //! Convert, Parabola, BSplineCurve, 2D .
39 class Convert_ParabolaToBSplineCurve : public Convert_ConicToBSplineCurve
47 //! The parabola Prb is limited between the parametric values U1, U2
48 //! and the equivalent B-spline curve as the same orientation as the
50 Standard_EXPORT Convert_ParabolaToBSplineCurve(const gp_Parab2d& Prb, const Standard_Real U1, const Standard_Real U2);
75 #endif // _Convert_ParabolaToBSplineCurve_HeaderFile