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 // Created on: 1994-03-17
 // Created by: Bruno DUMORTIER
 // Copyright (c) 1994-1999 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 _GeomAPI_ProjectPointOnSurf_HeaderFile
 #define _GeomAPI_ProjectPointOnSurf_HeaderFile
 
 #include <Standard.hxx>
 #include <Standard_DefineAlloc.hxx>
 #include <Standard_Handle.hxx>
 
 #include <Standard_Integer.hxx>
 #include <Extrema_ExtPS.hxx>
 #include <GeomAdaptor_Surface.hxx>
 #include <Extrema_ExtAlgo.hxx>
 #include <Extrema_ExtFlag.hxx>
 class gp_Pnt;
 class Geom_Surface;
 
 //! This class implements methods for computing all the orthogonal
 //! projections of a point onto a surface.
 class GeomAPI_ProjectPointOnSurf
 {
 public:
   DEFINE_STANDARD_ALLOC
 
   //! Creates an empty object. Use the
   //! Init function for further initialization.
   Standard_EXPORT GeomAPI_ProjectPointOnSurf();
 
   //! Create the projection of a point <P> on a surface
   //! <Surface>
   Standard_EXPORT GeomAPI_ProjectPointOnSurf(const gp_Pnt&                    P,
                                              const occ::handle<Geom_Surface>& Surface,
                                              const Extrema_ExtAlgo Algo = Extrema_ExtAlgo_Grad);
 
   //! Create the projection of a point <P> on a surface
   //! <Surface>
   //! Create the projection of a point <P> on a surface
   //! <Surface>. The solution are computed in the domain
   //! [Umin,Usup] [Vmin,Vsup] of the surface.
   Standard_EXPORT GeomAPI_ProjectPointOnSurf(const gp_Pnt&                    P,
                                              const occ::handle<Geom_Surface>& Surface,
                                              const double                     Tolerance,
                                              const Extrema_ExtAlgo Algo = Extrema_ExtAlgo_Grad);
 
   Standard_EXPORT GeomAPI_ProjectPointOnSurf(const gp_Pnt&                    P,
                                              const occ::handle<Geom_Surface>& Surface,
                                              const double                     Umin,
                                              const double                     Usup,
                                              const double                     Vmin,
                                              const double                     Vsup,
                                              const double                     Tolerance,
                                              const Extrema_ExtAlgo Algo = Extrema_ExtAlgo_Grad);
 
   //! Init the projection of a point <P> on a surface
   //! <Surface>
   Standard_EXPORT GeomAPI_ProjectPointOnSurf(const gp_Pnt&                    P,
                                              const occ::handle<Geom_Surface>& Surface,
                                              const double                     Umin,
                                              const double                     Usup,
                                              const double                     Vmin,
                                              const double                     Vsup,
                                              const Extrema_ExtAlgo Algo = Extrema_ExtAlgo_Grad);
 
   Standard_EXPORT void Init(const gp_Pnt&                    P,
                             const occ::handle<Geom_Surface>& Surface,
                             const double                     Tolerance,
                             const Extrema_ExtAlgo            Algo = Extrema_ExtAlgo_Grad);
 
   //! Init the projection of a point <P> on a surface
   //! <Surface>. The solution are computed in the domain
   //! [Umin,Usup] [Vmin,Vsup] of the surface.
   Standard_EXPORT void Init(const gp_Pnt&                    P,
                             const occ::handle<Geom_Surface>& Surface,
                             const Extrema_ExtAlgo            Algo = Extrema_ExtAlgo_Grad);
 
   Standard_EXPORT void Init(const gp_Pnt&                    P,
                             const occ::handle<Geom_Surface>& Surface,
                             const double                     Umin,
                             const double                     Usup,
                             const double                     Vmin,
                             const double                     Vsup,
                             const double                     Tolerance,
                             const Extrema_ExtAlgo            Algo = Extrema_ExtAlgo_Grad);
 
   //! Init the projection for many points on a surface
   //! <Surface>. The solutions will be computed in the domain
   //! [Umin,Usup] [Vmin,Vsup] of the surface.
   Standard_EXPORT void Init(const gp_Pnt&                    P,
                             const occ::handle<Geom_Surface>& Surface,
                             const double                     Umin,
                             const double                     Usup,
                             const double                     Vmin,
                             const double                     Vsup,
                             const Extrema_ExtAlgo            Algo = Extrema_ExtAlgo_Grad);
 
   Standard_EXPORT void Init(const occ::handle<Geom_Surface>& Surface,
                             const double                     Umin,
                             const double                     Usup,
                             const double                     Vmin,
                             const double                     Vsup,
                             const double                     Tolerance,
                             const Extrema_ExtAlgo            Algo = Extrema_ExtAlgo_Grad);
 
   Standard_EXPORT void Init(const occ::handle<Geom_Surface>& Surface,
                             const double                     Umin,
                             const double                     Usup,
                             const double                     Vmin,
                             const double                     Vsup,
                             const Extrema_ExtAlgo            Algo = Extrema_ExtAlgo_Grad);
 
   //! Sets the Extrema search algorithm - Grad or Tree.
   //! By default the Extrema is initialized with Grad algorithm.
   void SetExtremaAlgo(const Extrema_ExtAlgo theAlgo) { myExtPS.SetAlgo(theAlgo); }
 
   //! Sets the Extrema search flag - MIN or MAX or MINMAX.
   //! By default the Extrema is set to search the MinMax solutions.
   void SetExtremaFlag(const Extrema_ExtFlag theExtFlag) { myExtPS.SetFlag(theExtFlag); }
 
   //! Performs the projection of a point on the current surface.
   Standard_EXPORT void Perform(const gp_Pnt& P);
 
   Standard_EXPORT bool IsDone() const;
 
   //! Returns the number of computed orthogonal projection points.
   //! Note: if projection fails, NbPoints returns 0.
   Standard_EXPORT int NbPoints() const;
   Standard_EXPORT     operator int() const;
 
   //! Returns the orthogonal projection
   //! on the surface. Index is a number of a computed point.
   //! Exceptions
   //! Standard_OutOfRange if Index is not in the range [ 1,NbPoints ], where
   //! NbPoints is the number of solution points.
   Standard_EXPORT gp_Pnt Point(const int Index) const;
 
   //! Returns the parameters (U,V) on the
   //! surface of the orthogonal projection. Index is a number of a
   //! computed point.
   //! Exceptions
   //! Standard_OutOfRange if Index is not in the range [ 1,NbPoints ], where
   //! NbPoints is the number of solution points.
   Standard_EXPORT void Parameters(const int Index, double& U, double& V) const;
 
   //! Computes the distance between the
   //! point and its orthogonal projection on the surface. Index is a number
   //! of a computed point.
   //! Exceptions
   //! Standard_OutOfRange if Index is not in the range [ 1,NbPoints ], where
   //! NbPoints is the number of solution points.
   Standard_EXPORT double Distance(const int Index) const;
 
   //! Returns the nearest orthogonal projection of the point
   //! on the surface.
   //! Exceptions
   //! StdFail_NotDone if projection fails.
   Standard_EXPORT gp_Pnt NearestPoint() const;
   Standard_EXPORT        operator gp_Pnt() const;
 
   //! Returns the parameters (U,V) on the
   //! surface of the nearest computed orthogonal projection of the point.
   //! Exceptions
   //! StdFail_NotDone if projection fails.
   Standard_EXPORT void LowerDistanceParameters(double& U, double& V) const;
 
   //! Computes the distance between the
   //! point and its nearest orthogonal projection on the surface.
   //! Exceptions
   //! StdFail_NotDone if projection fails.
   Standard_EXPORT double LowerDistance() const;
   Standard_EXPORT        operator double() const;
 
   //! return the algorithmic object from Extrema
   const Extrema_ExtPS& Extrema() const;
 
 private:
   Standard_EXPORT void Init();
 
   bool                myIsDone;
   int                 myIndex;
   Extrema_ExtPS       myExtPS;
   GeomAdaptor_Surface myGeomAdaptor;
 };
 
 #include <GeomAPI_ProjectPointOnSurf.lxx>
 
 #endif // _GeomAPI_ProjectPointOnSurf_HeaderFile

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