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 // Copyright (c) 2025 OPEN CASCADE SAS
 //
 // This file is part of Open CASCADE Technology software library.
 //
 // This library is free software; you can redistribute it and/or modify it under
 // the terms of the GNU Lesser General Public License version 2.1 as published
 // by the Free Software Foundation, with special exception defined in the file
 // OCCT_LGPL_EXCEPTION.txt. Consult the file LICENSE_LGPL_21.txt included in OCCT
 // distribution for complete text of the license and disclaimer of any warranty.
 //
 // Alternatively, this file may be used under the terms of Open CASCADE
 // commercial license or contractual agreement.
 
 #ifndef _GeomGridEval_HeaderFile
 #define _GeomGridEval_HeaderFile
 
 #include <Geom_Curve.hxx>
 #include <Geom_Surface.hxx>
 #include <gp_Pnt2d.hxx>
 #include <NCollection_Array1.hxx>
 #include <NCollection_Array2.hxx>
 
 //! @brief Namespace containing type aliases and template helpers for grid evaluators.
 //!
 //! Provides type aliases to common evaluation result structures defined in Geom_Curve and
 //! Geom_Surface and template helpers for iterating over parameter grids.
 namespace GeomGridEval
 {
 
 using CurveD1 = Geom_Curve::ResD1;
 using CurveD2 = Geom_Curve::ResD2;
 using CurveD3 = Geom_Curve::ResD3;
 using SurfD1  = Geom_Surface::ResD1;
 using SurfD2  = Geom_Surface::ResD2;
 using SurfD3  = Geom_Surface::ResD3;
 
 //=================================================================================================
 // Template helpers for parametric surface evaluation.
 // These provide the iteration pattern, while the actual computation is delegated to a functor.
 //=================================================================================================
 
 //! Evaluate grid points using a point evaluator functor.
 //! @tparam Evaluator functor type with operator()(double theU, double theV) -> gp_Pnt
 //! @param theUParams array of U parameter values
 //! @param theVParams array of V parameter values
 //! @param theEval evaluator functor
 //! @return 2D array of evaluated points (1-based indexing)
 template <typename Evaluator>
 NCollection_Array2<gp_Pnt> EvaluateGridHelper(const NCollection_Array1<double>& theUParams,
                                               const NCollection_Array1<double>& theVParams,
                                               Evaluator                         theEval)
 {
   const int aNbU = theUParams.Length();
   const int aNbV = theVParams.Length();
   if (aNbU == 0 || aNbV == 0)
   {
     return NCollection_Array2<gp_Pnt>();
   }
 
   NCollection_Array2<gp_Pnt> aResult(1, aNbU, 1, aNbV);
   for (int iU = 1; iU <= aNbU; ++iU)
   {
     const double aU = theUParams.Value(theUParams.Lower() + iU - 1);
     for (int iV = 1; iV <= aNbV; ++iV)
     {
       const double aV = theVParams.Value(theVParams.Lower() + iV - 1);
       aResult.SetValue(iU, iV, theEval(aU, aV));
     }
   }
   return aResult;
 }
 
 //! Evaluate grid points with D1 using an evaluator functor.
 //! @tparam Evaluator functor type with operator()(double theU, double theV) -> SurfD1
 template <typename Evaluator>
 NCollection_Array2<SurfD1> EvaluateGridD1Helper(const NCollection_Array1<double>& theUParams,
                                                 const NCollection_Array1<double>& theVParams,
                                                 Evaluator                         theEval)
 {
   const int aNbU = theUParams.Length();
   const int aNbV = theVParams.Length();
   if (aNbU == 0 || aNbV == 0)
   {
     return NCollection_Array2<SurfD1>();
   }
 
   NCollection_Array2<SurfD1> aResult(1, aNbU, 1, aNbV);
   for (int iU = 1; iU <= aNbU; ++iU)
   {
     const double aU = theUParams.Value(theUParams.Lower() + iU - 1);
     for (int iV = 1; iV <= aNbV; ++iV)
     {
       const double aV             = theVParams.Value(theVParams.Lower() + iV - 1);
       aResult.ChangeValue(iU, iV) = theEval(aU, aV);
     }
   }
   return aResult;
 }
 
 //! Evaluate grid points with D2 using an evaluator functor.
 //! @tparam Evaluator functor type with operator()(double theU, double theV) -> SurfD2
 template <typename Evaluator>
 NCollection_Array2<SurfD2> EvaluateGridD2Helper(const NCollection_Array1<double>& theUParams,
                                                 const NCollection_Array1<double>& theVParams,
                                                 Evaluator                         theEval)
 {
   const int aNbU = theUParams.Length();
   const int aNbV = theVParams.Length();
   if (aNbU == 0 || aNbV == 0)
   {
     return NCollection_Array2<SurfD2>();
   }
 
   NCollection_Array2<SurfD2> aResult(1, aNbU, 1, aNbV);
   for (int iU = 1; iU <= aNbU; ++iU)
   {
     const double aU = theUParams.Value(theUParams.Lower() + iU - 1);
     for (int iV = 1; iV <= aNbV; ++iV)
     {
       const double aV             = theVParams.Value(theVParams.Lower() + iV - 1);
       aResult.ChangeValue(iU, iV) = theEval(aU, aV);
     }
   }
   return aResult;
 }
 
 //! Evaluate grid points with D3 using an evaluator functor.
 //! @tparam Evaluator functor type with operator()(double theU, double theV) -> SurfD3
 template <typename Evaluator>
 NCollection_Array2<SurfD3> EvaluateGridD3Helper(const NCollection_Array1<double>& theUParams,
                                                 const NCollection_Array1<double>& theVParams,
                                                 Evaluator                         theEval)
 {
   const int aNbU = theUParams.Length();
   const int aNbV = theVParams.Length();
   if (aNbU == 0 || aNbV == 0)
   {
     return NCollection_Array2<SurfD3>();
   }
 
   NCollection_Array2<SurfD3> aResult(1, aNbU, 1, aNbV);
   for (int iU = 1; iU <= aNbU; ++iU)
   {
     const double aU = theUParams.Value(theUParams.Lower() + iU - 1);
     for (int iV = 1; iV <= aNbV; ++iV)
     {
       const double aV             = theVParams.Value(theVParams.Lower() + iV - 1);
       aResult.ChangeValue(iU, iV) = theEval(aU, aV);
     }
   }
   return aResult;
 }
 
 //! Evaluate grid DN using an evaluator functor.
 //! @tparam Evaluator functor type with operator()(double theU, double theV) -> gp_Vec
 template <typename Evaluator>
 NCollection_Array2<gp_Vec> EvaluateGridDNHelper(const NCollection_Array1<double>& theUParams,
                                                 const NCollection_Array1<double>& theVParams,
                                                 Evaluator                         theEval)
 {
   const int aNbU = theUParams.Length();
   const int aNbV = theVParams.Length();
   if (aNbU == 0 || aNbV == 0)
   {
     return NCollection_Array2<gp_Vec>();
   }
 
   NCollection_Array2<gp_Vec> aResult(1, aNbU, 1, aNbV);
   for (int iU = 1; iU <= aNbU; ++iU)
   {
     const double aU = theUParams.Value(theUParams.Lower() + iU - 1);
     for (int iV = 1; iV <= aNbV; ++iV)
     {
       const double aV = theVParams.Value(theVParams.Lower() + iV - 1);
       aResult.SetValue(iU, iV, theEval(aU, aV));
     }
   }
   return aResult;
 }
 
 } // namespace GeomGridEval
 
 #endif // _GeomGridEval_HeaderFile

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