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 // Created on: 1997-09-30
 // Created by: Roman BORISOV
 // 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 _Approx_CurveOnSurface_HeaderFile
 #define _Approx_CurveOnSurface_HeaderFile
 
 #include <Adaptor2d_Curve2d.hxx>
 #include <Adaptor3d_Surface.hxx>
 #include <GeomAbs_Shape.hxx>
 
 class Geom_BSplineCurve;
 class Geom2d_BSplineCurve;
 
 //! Approximation of   curve on surface
 class Approx_CurveOnSurface 
 {
 public:
 
   DEFINE_STANDARD_ALLOC
 
   //! This constructor calls perform method. This constructor is deprecated.
   Standard_DEPRECATED("This constructor is deprecated. Use other constructor and perform method instead.")
   Standard_EXPORT Approx_CurveOnSurface(const Handle(Adaptor2d_Curve2d)& C2D, const Handle(Adaptor3d_Surface)& Surf, const Standard_Real First, const Standard_Real Last, const Standard_Real Tol, const GeomAbs_Shape Continuity, const Standard_Integer MaxDegree, const Standard_Integer MaxSegments, const Standard_Boolean Only3d = Standard_False, const Standard_Boolean Only2d = Standard_False);
 
   //! This constructor does not call perform method.
   //! @param theC2D   2D Curve to be approximated in 3D.
   //! @param theSurf  Surface where 2D curve is located.
   //! @param theFirst First parameter of resulting curve.
   //! @param theFirst Last parameter of resulting curve.
   //! @param theTol   Computation tolerance.
   Standard_EXPORT Approx_CurveOnSurface(const Handle(Adaptor2d_Curve2d)& theC2D,
                                         const Handle(Adaptor3d_Surface)& theSurf,
                                         const Standard_Real               theFirst,
                                         const Standard_Real               theLast,
                                         const Standard_Real               theTol);
 
   Standard_EXPORT Standard_Boolean IsDone() const;
   
   Standard_EXPORT Standard_Boolean HasResult() const;
   
   Standard_EXPORT Handle(Geom_BSplineCurve) Curve3d() const;
   
   Standard_EXPORT Standard_Real MaxError3d() const;
   
   Standard_EXPORT Handle(Geom2d_BSplineCurve) Curve2d() const;
   
   Standard_EXPORT Standard_Real MaxError2dU() const;
   
   //! returns the maximum errors relatively to the  U component or the V component of the
   //! 2d Curve
   Standard_EXPORT Standard_Real MaxError2dV() const;
 
   //! Constructs the 3d curve. Input parameters are ignored when the input curve is
   //! U-isoline or V-isoline.
   //! @param theMaxSegments Maximal number of segments in the resulting spline.
   //! @param theMaxDegree   Maximal degree of the result.
   //! @param theContinuity  Resulting continuity.
   //! @param theOnly3d      Determines building only 3D curve.
   //! @param theOnly2d      Determines building only 2D curve.
   Standard_EXPORT void Perform(const Standard_Integer theMaxSegments, 
                                const Standard_Integer theMaxDegree, 
                                const GeomAbs_Shape    theContinuity,
                                const Standard_Boolean theOnly3d = Standard_False,
                                const Standard_Boolean theOnly2d = Standard_False);
 
 protected:
 
   //! Checks whether the 2d curve is a isoline. It can be represented by b-spline, bezier,
   //! or geometric line. This line should have natural parameterization.
   //! @param theC2D       Trimmed curve to be checked.
   //! @param theIsU       Flag indicating that line is u const.
   //! @param theParam     Line parameter.
   //! @param theIsForward Flag indicating forward parameterization on a isoline.
   //! @return Standard_True when 2d curve is a line and Standard_False otherwise.
   Standard_Boolean isIsoLine(const Handle(Adaptor2d_Curve2d)& theC2D,
                              Standard_Boolean&                theIsU,
                              Standard_Real&                   theParam,
                              Standard_Boolean&                theIsForward) const;
 
   //! Builds 3D curve for a isoline. This method takes corresponding isoline from
   //! the input surface.
   //! @param theC2D   Trimmed curve to be approximated.
   //! @param theIsU   Flag indicating that line is u const.
   //! @param theParam Line parameter.
   //! @param theIsForward Flag indicating forward parameterization on a isoline.
   //! @return Standard_True when 3d curve is built and Standard_False otherwise.
   Standard_Boolean buildC3dOnIsoLine(const Handle(Adaptor2d_Curve2d)& theC2D,
                                      const Standard_Boolean           theIsU,
                                      const Standard_Real              theParam,
                                      const Standard_Boolean           theIsForward);
 
 private:
   Approx_CurveOnSurface& operator= (const Approx_CurveOnSurface&);
 
 private:
 
   //! Input curve.
   const Handle(Adaptor2d_Curve2d) myC2D;
 
   //! Input surface.
   const Handle(Adaptor3d_Surface) mySurf;
 
   //! First parameter of the result.
   const Standard_Real myFirst;
 
   //! Last parameter of the result.
   const Standard_Real myLast;
 
   //! Tolerance.
   Standard_Real myTol;
 
   Handle(Geom2d_BSplineCurve) myCurve2d;
   Handle(Geom_BSplineCurve) myCurve3d;
   Standard_Boolean myIsDone;
   Standard_Boolean myHasResult;
   Standard_Real myError3d;
   Standard_Real myError2dU;
   Standard_Real myError2dV;
 
 };
 
 #endif // _Approx_CurveOnSurface_HeaderFile

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