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 // Created on: 1993-10-06
 // Created by: Bruno DUMORTIER
 // Copyright (c) 1993-1999 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 _GeomFill_BSplineCurves_HeaderFile
 #define _GeomFill_BSplineCurves_HeaderFile
 
 #include <Standard.hxx>
 #include <Standard_DefineAlloc.hxx>
 #include <Standard_Handle.hxx>
 
 #include <GeomFill_FillingStyle.hxx>
 class Geom_BSplineSurface;
 class Geom_BSplineCurve;
 
 //! An algorithm for constructing a BSpline surface filled
 //! from contiguous BSpline curves which form its boundaries.
 //! The algorithm accepts two, three or four BSpline
 //! curves as the boundaries of the target surface.
 //! A range of filling styles - more or less rounded, more
 //! or less flat - is available.
 //! A BSplineCurves object provides a framework for:
 //! -   defining the boundaries, and the filling style of the surface
 //! -   implementing the construction algorithm
 //! -   consulting the result.
 //! Warning
 //! Some problems may show up with rational curves.
 class GeomFill_BSplineCurves
 {
 public:
   DEFINE_STANDARD_ALLOC
 
   //! Constructs a default BSpline surface framework.
   Standard_EXPORT GeomFill_BSplineCurves();
 
   Standard_EXPORT GeomFill_BSplineCurves(const Handle(Geom_BSplineCurve)& C1,
                                          const Handle(Geom_BSplineCurve)& C2,
                                          const Handle(Geom_BSplineCurve)& C3,
                                          const Handle(Geom_BSplineCurve)& C4,
                                          const GeomFill_FillingStyle      Type);
 
   Standard_EXPORT GeomFill_BSplineCurves(const Handle(Geom_BSplineCurve)& C1,
                                          const Handle(Geom_BSplineCurve)& C2,
                                          const Handle(Geom_BSplineCurve)& C3,
                                          const GeomFill_FillingStyle      Type);
 
   //! Constructs a framework for building a BSpline surface from either
   //! -   the four contiguous BSpline curves, C1, C2, C3 and C4, or
   //! -   the three contiguous BSpline curves, C1, C2 and C3, or
   //! -   the two contiguous BSpline curves, C1 and C2.
   //! The type of filling style Type to be used is one of:
   //! -   GeomFill_Stretch - the style with the flattest patch
   //! -   GeomFill_Coons - a rounded style of patch with
   //! less depth than that of Curved
   //! -   GeomFill_Curved - the style with the most rounded
   //! patch.Constructs a framework for building a BSpline
   //! surface common to the two BSpline curves, C1 and C2.
   //! Exceptions
   //! Standard_ConstructionError if the curves are not contiguous.
   Standard_EXPORT GeomFill_BSplineCurves(const Handle(Geom_BSplineCurve)& C1,
                                          const Handle(Geom_BSplineCurve)& C2,
                                          const GeomFill_FillingStyle      Type);
 
   //! if the curves cannot be joined
   Standard_EXPORT void Init(const Handle(Geom_BSplineCurve)& C1,
                             const Handle(Geom_BSplineCurve)& C2,
                             const Handle(Geom_BSplineCurve)& C3,
                             const Handle(Geom_BSplineCurve)& C4,
                             const GeomFill_FillingStyle      Type);
 
   //! if the curves cannot be joined
   Standard_EXPORT void Init(const Handle(Geom_BSplineCurve)& C1,
                             const Handle(Geom_BSplineCurve)& C2,
                             const Handle(Geom_BSplineCurve)& C3,
                             const GeomFill_FillingStyle      Type);
 
   //! Initializes or reinitializes this algorithm with two, three,
   //! or four curves - C1, C2, C3, and C4 - and Type, one
   //! of the following filling styles:
   //! -   GeomFill_Stretch - the style with the flattest patch
   //! -   GeomFill_Coons - a rounded style of patch with
   //! less depth than that of Curved
   //! -   GeomFill_Curved - the style with the most rounded patch.
   //! Exceptions
   //! Standard_ConstructionError if the curves are not contiguous.
   Standard_EXPORT void Init(const Handle(Geom_BSplineCurve)& C1,
                             const Handle(Geom_BSplineCurve)& C2,
                             const GeomFill_FillingStyle      Type);
 
   //! Returns the BSpline surface Surface resulting from
   //! the computation performed by this algorithm.
   const Handle(Geom_BSplineSurface)& Surface() const;
 
 protected:
 private:
   Handle(Geom_BSplineSurface) mySurface;
 };
 
 #include <GeomFill_BSplineCurves.lxx>
 
 #endif // _GeomFill_BSplineCurves_HeaderFile

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