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 // Created on: 1997-08-26
 // Created by: Stepan MISHIN
 // Copyright (c) 1997-1999 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 _GeomConvert_ApproxSurface_HeaderFile
 #define _GeomConvert_ApproxSurface_HeaderFile
 
 #include <Adaptor3d_Surface.hxx>
 #include <GeomAbs_Shape.hxx>
 #include <Standard_OStream.hxx>
 
 class Geom_BSplineSurface;
 class Geom_Surface;
 
 //! A framework to convert a surface to a BSpline
 //! surface. This is done by approximation to a BSpline
 //! surface within a given tolerance.
 class GeomConvert_ApproxSurface
 {
 public:
   DEFINE_STANDARD_ALLOC
 
   //! Constructs a surface approximation framework defined by
   //! -   the conic Surf
   //! -   the tolerance value Tol3d
   //! -   the degree of continuity UContinuity, VContinuity
   //! in the directions of the U and V parameters
   //! -   the highest degree MaxDegU, MaxDegV which
   //! the polynomial defining the BSpline curve may
   //! have in the directions of the U and V parameters
   //! -   the maximum number of segments MaxSegments
   //! allowed in the resulting BSpline curve
   //! -   the index of precision PrecisCode.
   Standard_EXPORT GeomConvert_ApproxSurface(const occ::handle<Geom_Surface>& Surf,
                                             const double                     Tol3d,
                                             const GeomAbs_Shape              UContinuity,
                                             const GeomAbs_Shape              VContinuity,
                                             const int                        MaxDegU,
                                             const int                        MaxDegV,
                                             const int                        MaxSegments,
                                             const int                        PrecisCode);
 
   //! Constructs a surface approximation framework defined by
   //! -   the Surf
   //! -   the tolerance value Tol3d
   //! -   the degree of continuity UContinuity, VContinuity
   //! in the directions of the U and V parameters
   //! -   the highest degree MaxDegU, MaxDegV which
   //! the polynomial defining the BSpline curve may
   //! have in the directions of the U and V parameters
   //! -   the maximum number of segments MaxSegments
   //! allowed in the resulting BSpline curve
   //! -   the index of precision PrecisCode.
   Standard_EXPORT GeomConvert_ApproxSurface(const occ::handle<Adaptor3d_Surface>& Surf,
                                             const double                          Tol3d,
                                             const GeomAbs_Shape                   UContinuity,
                                             const GeomAbs_Shape                   VContinuity,
                                             const int                             MaxDegU,
                                             const int                             MaxDegV,
                                             const int                             MaxSegments,
                                             const int                             PrecisCode);
 
   //! Returns the BSpline surface resulting from the approximation algorithm.
   Standard_EXPORT occ::handle<Geom_BSplineSurface> Surface() const;
 
   //! Returns true if the approximation has be done
   Standard_EXPORT bool IsDone() const;
 
   //! Returns true if the approximation did come out with a result that
   //! is not NECESSARILY within the required tolerance or a result
   //! that is not recognized with the wished continuities.
   Standard_EXPORT bool HasResult() const;
 
   //! Returns the greatest distance between a point on the
   //! source conic surface and the BSpline surface
   //! resulting from the approximation (>0 when an approximation
   //! has been done, 0 if no  approximation )
   Standard_EXPORT double MaxError() const;
 
   //! Prints on the stream o information on the current state of the object.
   Standard_EXPORT void Dump(Standard_OStream& o) const;
 
 private:
   //! Converts a surface to B-spline
   Standard_EXPORT void Approximate(const occ::handle<Adaptor3d_Surface>& theSurf,
                                    const double                          theTol3d,
                                    const GeomAbs_Shape                   theUContinuity,
                                    const GeomAbs_Shape                   theVContinuity,
                                    const int                             theMaxDegU,
                                    const int                             theMaxDegV,
                                    const int                             theMaxSegments,
                                    const int                             thePrecisCode);
 
   bool                             myIsDone;
   bool                             myHasResult;
   occ::handle<Geom_BSplineSurface> myBSplSurf;
   double                           myMaxError;
 };
 
 #endif // _GeomConvert_ApproxSurface_HeaderFile

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