include/opencascade/Convert_CircleToBSplineCurve.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_CircleToBSplineCurve_HeaderFile
0018 #define _Convert_CircleToBSplineCurve_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_Circ2d;
0027
0028
0029
0030 //! This algorithm converts a circle into a rational B-spline curve.
0031 //! The circle is a Circ2d from package gp and its parametrization is :
0032 //! P (U) = Loc + R * (Cos(U) * Xdir + Sin(U) * YDir) where Loc is the
0033 //! center of the circle Xdir and Ydir are the normalized directions
0034 //! of the local cartesian coordinate system of the circle.
0035 //! The parametrization range for the circle is U [0, 2Pi].
0036 //!
0037 //! Warnings :
0038 //! The parametrization range for the B-spline curve is not [0, 2Pi].
0039 //!
0040 //! KeyWords :
0041 //! Convert, Circle, BSplineCurve, 2D .
0042 class Convert_CircleToBSplineCurve  : public Convert_ConicToBSplineCurve
0043 {
0044 public:
0045
0046   DEFINE_STANDARD_ALLOC
0047
0048
0049
0050   //! The equivalent B-spline curve has the same orientation
0051   //! as the circle C.
0052   Standard_EXPORT Convert_CircleToBSplineCurve(const gp_Circ2d& C, const Convert_ParameterisationType Parameterisation = Convert_TgtThetaOver2);
0053
0054
0055   //! The circle C is limited between the parametric values U1, U2
0056   //! in radians. U1 and U2 [0.0, 2*Pi] .
0057   //! The equivalent B-spline curve is oriented from U1 to U2 and has
0058   //! the same orientation as the circle C.
0059   //!
0060   //! Raised if U1 = U2 or U1 = U2 + 2.0 * Pi
0061   Standard_EXPORT Convert_CircleToBSplineCurve(const gp_Circ2d& C, const Standard_Real U1, const Standard_Real U2, const Convert_ParameterisationType Parameterisation = Convert_TgtThetaOver2);
0062
0063
0064
0065
0066 protected:
0067
0068
0069
0070
0071
0072 private:
0073
0074
0075
0076
0077
0078 };
0079
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0085
0086 #endif // _Convert_CircleToBSplineCurve_HeaderFile