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0001 // Copyright (c) 2025 OPEN CASCADE SAS 0002 // 0003 // This file is part of Open CASCADE Technology software library. 0004 // 0005 // This library is free software; you can redistribute it and/or modify it under 0006 // the terms of the GNU Lesser General Public License version 2.1 as published 0007 // by the Free Software Foundation, with special exception defined in the file 0008 // OCCT_LGPL_EXCEPTION.txt. Consult the file LICENSE_LGPL_21.txt included in OCCT 0009 // distribution for complete text of the license and disclaimer of any warranty. 0010 // 0011 // Alternatively, this file may be used under the terms of Open CASCADE 0012 // commercial license or contractual agreement. 0013 0014 #ifndef _HelixGeom_Tools_HeaderFile 0015 #define _HelixGeom_Tools_HeaderFile 0016 0017 #include <Adaptor3d_Curve.hxx> 0018 #include <GeomAbs_Shape.hxx> 0019 0020 class Geom_BSplineCurve; 0021 0022 //! Static utility class providing approximation algorithms for helix curves. 0023 //! 0024 //! This class contains static methods for: 0025 //! - Converting analytical helix curves to B-spline approximations 0026 //! - Generic curve approximation with specified tolerances and continuity 0027 //! - High-quality approximation suitable for CAD/CAM applications 0028 //! 0029 //! The approximation algorithms use advanced techniques to ensure: 0030 //! - Accurate representation within specified tolerances 0031 //! - Smooth continuity (C0, C1, C2) as required 0032 //! - Efficient B-spline parameterization 0033 //! - Robust handling of edge cases 0034 class HelixGeom_Tools 0035 { 0036 public: 0037 DEFINE_STANDARD_ALLOC 0038 0039 //! Approximates a parametric helix curve using B-spline representation. 0040 //! @param aT1 [in] Start parameter (angular position in radians) 0041 //! @param aT2 [in] End parameter (angular position in radians) 0042 //! @param aPitch [in] Helix pitch (vertical distance per 2*PI radians) 0043 //! @param aRStart [in] Starting radius at parameter aT1 0044 //! @param aTaperAngle [in] Taper angle in radians (0 = cylindrical helix) 0045 //! @param aIsCW [in] True for clockwise, false for counter-clockwise 0046 //! @param aTol [in] Approximation tolerance 0047 //! @param theBSpl [out] Resulting B-spline curve 0048 //! @param theMaxError [out] Maximum approximation error achieved 0049 //! @return 0 on success, error code otherwise 0050 Standard_EXPORT static int ApprHelix(const double aT1, 0051 const double aT2, 0052 const double aPitch, 0053 const double aRStart, 0054 const double aTaperAngle, 0055 const bool aIsCW, 0056 const double aTol, 0057 occ::handle<Geom_BSplineCurve>& theBSpl, 0058 double& theMaxError); 0059 0060 //! Approximates a generic 3D curve using B-spline representation. 0061 //! @param theHC [in] Handle to the curve adaptor to approximate 0062 //! @param theTol [in] Approximation tolerance 0063 //! @param theCont [in] Required continuity (C0, C1, C2) 0064 //! @param theMaxSeg [in] Maximum number of curve segments 0065 //! @param theMaxDeg [in] Maximum degree of B-spline curve 0066 //! @param theBSpl [out] Resulting B-spline curve 0067 //! @param theMaxError [out] Maximum approximation error achieved 0068 //! @return 0 on success, error code otherwise 0069 Standard_EXPORT static int ApprCurve3D(const occ::handle<Adaptor3d_Curve>& theHC, 0070 const double theTol, 0071 const GeomAbs_Shape theCont, 0072 const int theMaxSeg, 0073 const int theMaxDeg, 0074 occ::handle<Geom_BSplineCurve>& theBSpl, 0075 double& theMaxError); 0076 }; 0077 0078 #endif // _HelixGeom_Tools_HeaderFile
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