// 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 Handle(Geom_Surface)& Surf, const Standard_Real Tol3d, const GeomAbs_Shape UContinuity, const GeomAbs_Shape VContinuity, const Standard_Integer MaxDegU, const Standard_Integer MaxDegV, const Standard_Integer MaxSegments, const Standard_Integer 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 Handle(Adaptor3d_Surface)& Surf, const Standard_Real Tol3d, const GeomAbs_Shape UContinuity, const GeomAbs_Shape VContinuity, const Standard_Integer MaxDegU, const Standard_Integer MaxDegV, const Standard_Integer MaxSegments, const Standard_Integer PrecisCode);
  
  //! Returns the BSpline surface resulting from the approximation algorithm.
  Standard_EXPORT Handle(Geom_BSplineSurface) Surface() const;
  
  //! Returns Standard_True if the approximation has be done
  Standard_EXPORT Standard_Boolean 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 Standard_Boolean 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 Standard_Real MaxError() const;
  
  //! Prints on the stream o information on the current state of the object.
  Standard_EXPORT void Dump (Standard_OStream& o) const;




protected:





private:

  
  //! Converts a surface to B-spline
  Standard_EXPORT void Approximate (const Handle(Adaptor3d_Surface)& theSurf, const Standard_Real theTol3d, const GeomAbs_Shape theUContinuity, const GeomAbs_Shape theVContinuity, const Standard_Integer theMaxDegU, const Standard_Integer theMaxDegV, const Standard_Integer theMaxSegments, const Standard_Integer thePrecisCode);


  Standard_Boolean myIsDone;
  Standard_Boolean myHasResult;
  Handle(Geom_BSplineSurface) myBSplSurf;
  Standard_Real myMaxError;


};







#endif // _GeomConvert_ApproxSurface_HeaderFile