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 // Created on: 1995-07-18
 // Created by: Modelistation
 // Copyright (c) 1995-1999 Matra Datavision
 // Copyright (c) 1999-2014 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 _Extrema_GenExtPS_HeaderFile
 #define _Extrema_GenExtPS_HeaderFile
 
 #include <Bnd_Sphere.hxx>
 #include <NCollection_Array1.hxx>
 #include <NCollection_HArray1.hxx>
 #include <Extrema_POnSurfParams.hxx>
 #include <NCollection_Array2.hxx>
 #include <NCollection_UBTreeFiller.hxx>
 #include <NCollection_Handle.hxx>
 #include <Extrema_FuncPSNorm.hxx>
 #include <Extrema_ExtFlag.hxx>
 #include <Extrema_ExtAlgo.hxx>
 
 class Adaptor3d_Surface;
 
 //! It calculates all the extremum distances
 //! between a point and a surface.
 //! These distances can be minimum or maximum.
 class Extrema_GenExtPS
 {
 public:
   DEFINE_STANDARD_ALLOC
 
   //! Empty constructor.
   Standard_EXPORT Extrema_GenExtPS();
 
   //! Destructor.
   Standard_EXPORT ~Extrema_GenExtPS();
 
   //! It calculates all the distances.
   //! The function F(u,v)=distance(P,S(u,v)) has an
   //! extremum when gradient(F)=0. The algorithm searches
   //! all the zeros inside the definition ranges of the
   //! surface.
   //! NbU and NbV are used to locate the close points
   //! to find the zeros. They must be great enough
   //! such that if there is N extrema, there will
   //! be N extrema between P and the grid.
   //! TolU et TolV are used to determine the conditions
   //! to stop the iterations; at the iteration number n:
   //! (Un - Un-1) < TolU and (Vn - Vn-1) < TolV .
   Standard_EXPORT Extrema_GenExtPS(const gp_Pnt&            P,
                                    const Adaptor3d_Surface& S,
                                    const int                NbU,
                                    const int                NbV,
                                    const double             TolU,
                                    const double             TolV,
                                    const Extrema_ExtFlag    F = Extrema_ExtFlag_MINMAX,
                                    const Extrema_ExtAlgo    A = Extrema_ExtAlgo_Grad);
 
   //! It calculates all the distances.
   //! The function F(u,v)=distance(P,S(u,v)) has an
   //! extremum when gradient(F)=0. The algorithm searches
   //! all the zeros inside the definition ranges of the
   //! surface.
   //! NbU and NbV are used to locate the close points
   //! to find the zeros. They must be great enough
   //! such that if there is N extrema, there will
   //! be N extrema between P and the grid.
   //! TolU et TolV are used to determine the conditions
   //! to stop the iterations; at the iteration number n:
   //! (Un - Un-1) < TolU and (Vn - Vn-1) < TolV .
   Standard_EXPORT Extrema_GenExtPS(const gp_Pnt&            P,
                                    const Adaptor3d_Surface& S,
                                    const int                NbU,
                                    const int                NbV,
                                    const double             Umin,
                                    const double             Usup,
                                    const double             Vmin,
                                    const double             Vsup,
                                    const double             TolU,
                                    const double             TolV,
                                    const Extrema_ExtFlag    F = Extrema_ExtFlag_MINMAX,
                                    const Extrema_ExtAlgo    A = Extrema_ExtAlgo_Grad);
 
   Standard_EXPORT void Initialize(const Adaptor3d_Surface& S,
                                   const int                NbU,
                                   const int                NbV,
                                   const double             TolU,
                                   const double             TolV);
 
   Standard_EXPORT void Initialize(const Adaptor3d_Surface& S,
                                   const int                NbU,
                                   const int                NbV,
                                   const double             Umin,
                                   const double             Usup,
                                   const double             Vmin,
                                   const double             Vsup,
                                   const double             TolU,
                                   const double             TolV);
 
   //! the algorithm is done with the point P.
   //! An exception is raised if the fields have not
   //! been initialized.
   Standard_EXPORT void Perform(const gp_Pnt& P);
 
   Standard_EXPORT void SetFlag(const Extrema_ExtFlag F);
 
   Standard_EXPORT void SetAlgo(const Extrema_ExtAlgo A);
 
   //! Returns True if the distances are found.
   Standard_EXPORT bool IsDone() const;
 
   //! Returns the number of extremum distances.
   Standard_EXPORT int NbExt() const;
 
   //! Returns the value of the Nth resulting square distance.
   Standard_EXPORT double SquareDistance(const int N) const;
 
   //! Returns the point of the Nth resulting distance.
   Standard_EXPORT const Extrema_POnSurf& Point(const int N) const;
 
 private:
   Standard_EXPORT void BuildTree();
 
   Standard_EXPORT void FindSolution(const gp_Pnt& P, const Extrema_POnSurfParams& theParams);
 
   //! Selection of points to build grid, depending on the type of surface
   Standard_EXPORT void GetGridPoints(const Adaptor3d_Surface& theSurf);
 
   //! Creation of grid of parametric points
   Standard_EXPORT void BuildGrid(const gp_Pnt& thePoint);
 
   //! Compute new edge parameters.
   Standard_EXPORT const Extrema_POnSurfParams& ComputeEdgeParameters(
     const bool                   IsUEdge,
     const Extrema_POnSurfParams& theParam0,
     const Extrema_POnSurfParams& theParam1,
     const gp_Pnt&                thePoints,
     const double                 theDiffTol);
 
 private:
   // disallow copies
   Extrema_GenExtPS(const Extrema_GenExtPS&)            = delete;
   Extrema_GenExtPS& operator=(const Extrema_GenExtPS&) = delete;
 
 private:
   bool   myDone;
   bool   myInit;
   double myumin;
   double myusup;
   double myvmin;
   double myvsup;
   int    myusample;
   int    myvsample;
   double mytolu;
   double mytolv;
 
   NCollection_Array2<Extrema_POnSurfParams>               myPoints;
   NCollection_Handle<NCollection_UBTree<int, Bnd_Sphere>> mySphereUBTree;
   occ::handle<NCollection_HArray1<Bnd_Sphere>>            mySphereArray;
   Extrema_FuncPSNorm                                      myF;
   const Adaptor3d_Surface*                                myS;
   Extrema_ExtFlag                                         myFlag;
   Extrema_ExtAlgo                                         myAlgo;
   occ::handle<NCollection_HArray1<double>>                myUParams;
   occ::handle<NCollection_HArray1<double>>                myVParams;
   NCollection_Array2<Extrema_POnSurfParams>               myFacePntParams;
   NCollection_Array2<Extrema_POnSurfParams>               myUEdgePntParams;
   NCollection_Array2<Extrema_POnSurfParams>               myVEdgePntParams;
   Extrema_POnSurfParams                                   myGridParam;
 };
 
 #endif // _Extrema_GenExtPS_HeaderFile

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