include/opencascade/Convert_ParabolaToBSplineCurve.hxx

0001 // Created on: 1991-10-10
0002 // Created by: Jean Claude VAUTHIER
0003 // Copyright (c) 1991-1999 Matra Datavision
0004 // Copyright (c) 1999-2014 OPEN CASCADE SAS
0005 //
0006 // This file is part of Open CASCADE Technology software library.
0007 //
0008 // This library is free software; you can redistribute it and/or modify it under
0009 // the terms of the GNU Lesser General Public License version 2.1 as published
0010 // by the Free Software Foundation, with special exception defined in the file
0011 // OCCT_LGPL_EXCEPTION.txt. Consult the file LICENSE_LGPL_21.txt included in OCCT
0012 // distribution for complete text of the license and disclaimer of any warranty.
0013 //
0014 // Alternatively, this file may be used under the terms of Open CASCADE
0015 // commercial license or contractual agreement.
0016
0017 #ifndef _Convert_ParabolaToBSplineCurve_HeaderFile
0018 #define _Convert_ParabolaToBSplineCurve_HeaderFile
0019
0020 #include <Standard.hxx>
0021 #include <Standard_DefineAlloc.hxx>
0022 #include <Standard_Handle.hxx>
0023
0024 #include <Convert_ConicToBSplineCurve.hxx>
0025 class gp_Parab2d;
0026
0027 //! This algorithm converts a parabola into a non rational B-spline
0028 //! curve.
0029 //! The parabola is a Parab2d from package gp with the parametrization
0030 //! P (U) = Loc + F * (U*U * Xdir + 2 * U * Ydir) where Loc is the
0031 //! apex of the parabola, Xdir is the normalized direction of the
0032 //! symmetry axis of the parabola, Ydir is the normalized direction of
0033 //! the directrix and F is the focal length.
0034 //! KeyWords :
0035 //! Convert, Parabola, BSplineCurve, 2D .
0036 class Convert_ParabolaToBSplineCurve : public Convert_ConicToBSplineCurve
0037 {
0038 public:
0039   DEFINE_STANDARD_ALLOC
0040
0041   //! The parabola Prb is limited between the parametric values U1, U2
0042   //! and the equivalent B-spline curve as the same orientation as the
0043   //! parabola Prb.
0044   Standard_EXPORT Convert_ParabolaToBSplineCurve(const gp_Parab2d& Prb,
0045                                                  const double      U1,
0046                                                  const double      U2);
0047 };
0048
0049 #endif // _Convert_ParabolaToBSplineCurve_HeaderFile