// Created on: 2016-02-04
// Created by: Anastasia BORISOVA
// Copyright (c) 2016 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 _Prs3d_ToolSphere_HeaderFile
#define _Prs3d_ToolSphere_HeaderFile

#include "Prs3d_ToolQuadric.hxx"

//! Standard presentation algorithm that outputs graphical primitives for spherical surface.
class Prs3d_ToolSphere : public Prs3d_ToolQuadric
{
public:
  //! Generate primitives for 3D quadric surface.
  //! @param[in] theRadius    sphere radius
  //! @param[in] theNbSlices  number of slices within U parameter
  //! @param[in] theNbStacks  number of stacks within V parameter
  //! @param[in] theTrsf      optional transformation to apply
  //! @return generated triangulation
  Standard_EXPORT static occ::handle<Graphic3d_ArrayOfTriangles> Create(const double   theRadius,
                                                                        const int      theNbSlices,
                                                                        const int      theNbStacks,
                                                                        const gp_Trsf& theTrsf);

public:
  //! Initializes the algorithm creating a sphere.
  //! @param[in] theRadius    sphere radius
  //! @param[in] theNbSlices  number of slices within U parameter
  //! @param[in] theNbStacks  number of stacks within V parameter
  Standard_EXPORT Prs3d_ToolSphere(const double theRadius,
                                   const int    theNbSlices,
                                   const int    theNbStacks);

protected:
  //! Computes vertex at given parameter location of the surface.
  Standard_EXPORT gp_Pnt Vertex(const double theU, const double theV) const override;

  //! Computes normal at given parameter location of the surface.
  Standard_EXPORT gp_Dir Normal(const double theU, const double theV) const override;

protected:
  double myRadius; //!< sphere radius
};

#endif