include/opencascade/Convert_EllipseToBSplineCurve.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_EllipseToBSplineCurve_HeaderFile
0018 #define _Convert_EllipseToBSplineCurve_HeaderFile
0019
0020 #include <Standard.hxx>
0021 #include <Standard_DefineAlloc.hxx>
0022 #include <Standard_Handle.hxx>
0023
0024 #include <Convert_ConicToBSplineCurve.hxx>
0025 #include <Convert_ParameterisationType.hxx>
0026 class gp_Elips2d;
0027
0028 //! This algorithm converts a ellipse into a rational B-spline curve.
0029 //! The ellipse is represented an Elips2d from package gp with
0030 //! the parametrization :
0031 //! P (U) =
0032 //! Loc + (MajorRadius * Cos(U) * Xdir + MinorRadius * Sin(U) * Ydir)
0033 //! where Loc is the center of the ellipse, Xdir and Ydir are the
0034 //! normalized directions of the local cartesian coordinate system of
0035 //! the ellipse. The parametrization range is U [0, 2PI].
0036 //! KeyWords :
0037 //! Convert, Ellipse, BSplineCurve, 2D .
0038 class Convert_EllipseToBSplineCurve : public Convert_ConicToBSplineCurve
0039 {
0040 public:
0041   DEFINE_STANDARD_ALLOC
0042
0043   //! The equivalent B-spline curve has the same orientation
0044   //! as the ellipse E.
0045   Standard_EXPORT Convert_EllipseToBSplineCurve(
0046     const gp_Elips2d&                  E,
0047     const Convert_ParameterisationType Parameterisation = Convert_TgtThetaOver2);
0048
0049   //! The ellipse E is limited between the parametric values U1, U2.
0050   //! The equivalent B-spline curve is oriented from U1 to U2 and has
0051   //! the same orientation as E.
0052   //!
0053   //! Raised if U1 = U2 or U1 = U2 + 2.0 * Pi
0054   Standard_EXPORT Convert_EllipseToBSplineCurve(
0055     const gp_Elips2d&                  E,
0056     const Standard_Real                U1,
0057     const Standard_Real                U2,
0058     const Convert_ParameterisationType Parameterisation = Convert_TgtThetaOver2);
0059
0060 protected:
0061 private:
0062 };
0063
0064 #endif // _Convert_EllipseToBSplineCurve_HeaderFile