include/opencascade/GeomLib_CheckBSplineCurve.hxx

0001 // Created on: 1997-05-28
0002 // Created by: Xavier BENVENISTE
0003 // Copyright (c) 1997-1999 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 _GeomLib_CheckBSplineCurve_HeaderFile
0018 #define _GeomLib_CheckBSplineCurve_HeaderFile
0019
0020 #include <Standard.hxx>
0021 #include <Standard_DefineAlloc.hxx>
0022 #include <Standard_Handle.hxx>
0023
0024 class Geom_BSplineCurve;
0025
0026 //! Checks for the end tangents : whether or not those
0027 //! are reversed regarding the third or n-3rd control
0028 class GeomLib_CheckBSplineCurve
0029 {
0030 public:
0031   DEFINE_STANDARD_ALLOC
0032
0033   Standard_EXPORT GeomLib_CheckBSplineCurve(const occ::handle<Geom_BSplineCurve>& Curve,
0034                                             const double                          Tolerance,
0035                                             const double                          AngularTolerance);
0036
0037   bool IsDone() const;
0038
0039   Standard_EXPORT void NeedTangentFix(bool& FirstFlag, bool& SecondFlag) const;
0040
0041   Standard_EXPORT void FixTangent(const bool FirstFlag, const bool LastFlag);
0042
0043   //! modifies the curve
0044   //! by fixing the first or the last tangencies
0045   //!
0046   //! if Index3D not in the Range [1,Nb3dSpaces]
0047   //! if the Approx is not Done
0048   Standard_EXPORT occ::handle<Geom_BSplineCurve> FixedTangent(const bool FirstFlag,
0049                                                               const bool LastFlag);
0050
0051 private:
0052   void FixTangentOnCurve(occ::handle<Geom_BSplineCurve>& theCurve,
0053                          const bool                      FirstFlag,
0054                          const bool                      LastFlag);
0055
0056   occ::handle<Geom_BSplineCurve> myCurve;
0057   bool                           myDone;
0058   bool                           myFixFirstTangent;
0059   bool                           myFixLastTangent;
0060   double                         myAngularTolerance;
0061   double                         myTolerance;
0062
0063   int myIndSecondPole;
0064   int myIndPrelastPole;
0065 };
0066
0067 #include <GeomLib_CheckBSplineCurve.lxx>
0068
0069 #endif // _GeomLib_CheckBSplineCurve_HeaderFile