OCCT

// Created on: 1991-10-10
// Created by: Jean Claude VAUTHIER
// Copyright (c) 1991-1999 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 _Convert_TorusToBSplineSurface_HeaderFile
#define _Convert_TorusToBSplineSurface_HeaderFile

#include <Standard.hxx>
#include <Standard_DefineAlloc.hxx>
#include <Standard_Handle.hxx>

#include <Convert_ElementarySurfaceToBSplineSurface.hxx>
#include <Standard_Boolean.hxx>
class gp_Torus;

//! This algorithm converts a bounded Torus into a rational
//! B-spline surface. The torus is a Torus from package gp.
//! The parametrization of the torus is :
//! P (U, V) =
//! Loc + MinorRadius * std::sin(V) * Zdir +
//! (MajorRadius+MinorRadius*std::cos(V)) * (std::cos(U)*Xdir + std::sin(U)*Ydir)
//! where Loc is the center of the torus, Xdir, Ydir and Zdir are the
//! normalized directions of the local cartesian coordinate system of
//! the Torus. The parametrization range is U [0, 2PI], V [0, 2PI].
//! KeyWords :
//! Convert, Torus, BSplineSurface.
class Convert_TorusToBSplineSurface : public Convert_ElementarySurfaceToBSplineSurface
{
public:
  DEFINE_STANDARD_ALLOC

  //! The equivalent B-spline surface as the same orientation as the
  //! torus in the U and V parametric directions.
  //!
  //! Raised if U1 = U2 or U1 = U2 + 2.0 * Pi
  //! Raised if V1 = V2 or V1 = V2 + 2.0 * Pi
  Standard_EXPORT Convert_TorusToBSplineSurface(const gp_Torus& T,
                                                const double    U1,
                                                const double    U2,
                                                const double    V1,
                                                const double    V2);

  //! The equivalent B-spline surface as the same orientation as the
  //! torus in the U and V parametric directions.
  //!
  //! Raised if Param1 = Param2 or Param1 = Param2 + 2.0 * Pi
  Standard_EXPORT Convert_TorusToBSplineSurface(const gp_Torus& T,
                                                const double    Param1,
                                                const double    Param2,
                                                const bool      UTrim = true);

  //! The equivalent B-spline surface as the same orientation as the
  //! torus in the U and V parametric directions.
  Standard_EXPORT Convert_TorusToBSplineSurface(const gp_Torus& T);
};

#endif // _Convert_TorusToBSplineSurface_HeaderFile