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_EllipseToBSplineCurve_HeaderFile
18 #define _Convert_EllipseToBSplineCurve_HeaderFile
20 #include <Standard.hxx>
21 #include <Standard_DefineAlloc.hxx>
22 #include <Standard_Handle.hxx>
24 #include <Convert_ConicToBSplineCurve.hxx>
25 #include <Convert_ParameterisationType.hxx>
30 //! This algorithm converts a ellipse into a rational B-spline curve.
31 //! The ellipse is represented an Elips2d from package gp with
32 //! the parametrization :
34 //! Loc + (MajorRadius * Cos(U) * Xdir + MinorRadius * Sin(U) * Ydir)
35 //! where Loc is the center of the ellipse, Xdir and Ydir are the
36 //! normalized directions of the local cartesian coordinate system of
37 //! the ellipse. The parametrization range is U [0, 2PI].
39 //! Convert, Ellipse, BSplineCurve, 2D .
40 class Convert_EllipseToBSplineCurve : public Convert_ConicToBSplineCurve
47 //! The equivalent B-spline curve has the same orientation
49 Standard_EXPORT Convert_EllipseToBSplineCurve(const gp_Elips2d& E, const Convert_ParameterisationType Parameterisation = Convert_TgtThetaOver2);
52 //! The ellipse E is limited between the parametric values U1, U2.
53 //! The equivalent B-spline curve is oriented from U1 to U2 and has
54 //! the same orientation as E.
56 //! Raised if U1 = U2 or U1 = U2 + 2.0 * Pi
57 Standard_EXPORT Convert_EllipseToBSplineCurve(const gp_Elips2d& E, const Standard_Real U1, const Standard_Real U2, const Convert_ParameterisationType Parameterisation = Convert_TgtThetaOver2);
82 #endif // _Convert_EllipseToBSplineCurve_HeaderFile