include/opencascade/Geom2dGridEval_OffsetCurve.hxx

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 _Geom2dGridEval_OffsetCurve_HeaderFile
0015 #define _Geom2dGridEval_OffsetCurve_HeaderFile
0016
0017 #include <Geom2d_Curve.hxx>
0018 #include <Geom2d_OffsetCurve.hxx>
0019 #include <Geom2dGridEval.hxx>
0020 #include <NCollection_Array1.hxx>
0021 #include <Standard.hxx>
0022 #include <Standard_DefineAlloc.hxx>
0023
0024 //! @brief Batch evaluator for 2D offset curve grid points.
0025 //!
0026 //! Evaluates the 2D offset curve formula:
0027 //! P(u) = C(u) + Offset * N / ||N||
0028 //! where N = (D1.Y, -D1.X) is the normal (tangent rotated 90 degrees).
0029 //!
0030 //! Uses Geom2dGridEval_Curve for batch evaluation of the basis curve,
0031 //! then applies offset transformation.
0032 //!
0033 //! Usage:
0034 //! @code
0035 //!   Geom2dGridEval_OffsetCurve anEvaluator(myGeom2dOffset);
0036 //!   NCollection_Array1<gp_Pnt2d> aGrid = anEvaluator.EvaluateGrid(myParams);
0037 //! @endcode
0038 class Geom2dGridEval_OffsetCurve
0039 {
0040 public:
0041   DEFINE_STANDARD_ALLOC
0042
0043   //! Constructor with geometry.
0044   //! @param theOffset the 2D offset curve geometry to evaluate
0045   Geom2dGridEval_OffsetCurve(const occ::handle<Geom2d_OffsetCurve>& theOffset)
0046       : myGeom(theOffset),
0047         myOffset(0.0)
0048   {
0049     if (!myGeom.IsNull())
0050     {
0051       myOffset = myGeom->Offset();
0052       myBasis  = myGeom->BasisCurve();
0053     }
0054   }
0055
0056   //! Non-copyable and non-movable.
0057   Geom2dGridEval_OffsetCurve(const Geom2dGridEval_OffsetCurve&)            = delete;
0058   Geom2dGridEval_OffsetCurve& operator=(const Geom2dGridEval_OffsetCurve&) = delete;
0059   Geom2dGridEval_OffsetCurve(Geom2dGridEval_OffsetCurve&&)                 = delete;
0060   Geom2dGridEval_OffsetCurve& operator=(Geom2dGridEval_OffsetCurve&&)      = delete;
0061
0062   //! Returns the geometry handle.
0063   const occ::handle<Geom2d_OffsetCurve>& Geometry() const { return myGeom; }
0064
0065   //! Evaluate all grid points.
0066   //! @param theParams array of parameter values
0067   //! @return array of evaluated points (1-based indexing),
0068   //!         or empty array if geometry is null or no parameters
0069   Standard_EXPORT NCollection_Array1<gp_Pnt2d> EvaluateGrid(
0070     const NCollection_Array1<double>& theParams) const;
0071
0072   //! Evaluate all grid points with first derivative.
0073   //! @param theParams array of parameter values
0074   //! @return array of CurveD1 (1-based indexing),
0075   //!         or empty array if geometry is null or no parameters
0076   Standard_EXPORT NCollection_Array1<Geom2dGridEval::CurveD1> EvaluateGridD1(
0077     const NCollection_Array1<double>& theParams) const;
0078
0079   //! Evaluate all grid points with first and second derivatives.
0080   //! @param theParams array of parameter values
0081   //! @return array of CurveD2 (1-based indexing),
0082   //!         or empty array if geometry is null or no parameters
0083   Standard_EXPORT NCollection_Array1<Geom2dGridEval::CurveD2> EvaluateGridD2(
0084     const NCollection_Array1<double>& theParams) const;
0085
0086   //! Evaluate all grid points with derivatives up to third order.
0087   //! @param theParams array of parameter values
0088   //! @return array of CurveD3 (1-based indexing),
0089   //!         or empty array if geometry is null or no parameters
0090   Standard_EXPORT NCollection_Array1<Geom2dGridEval::CurveD3> EvaluateGridD3(
0091     const NCollection_Array1<double>& theParams) const;
0092
0093   //! Evaluate Nth derivative at all grid points.
0094   //! For orders 1-3, reuses EvaluateGridD1/D2/D3.
0095   //! For orders > 3, uses basis curve DN method.
0096   //! @param theParams array of parameter values
0097   //! @param theN derivative order (N >= 1)
0098   //! @return array of derivative vectors (1-based indexing)
0099   Standard_EXPORT NCollection_Array1<gp_Vec2d> EvaluateGridDN(
0100     const NCollection_Array1<double>& theParams,
0101     int                               theN) const;
0102
0103 private:
0104   occ::handle<Geom2d_OffsetCurve> myGeom;
0105   occ::handle<Geom2d_Curve>       myBasis;
0106   double                          myOffset;
0107 };
0108
0109 #endif // _Geom2dGridEval_OffsetCurve_HeaderFile