// Created on: 1992-10-01
// Created by: Jacques GOUSSARD
// Copyright (c) 1992-1999 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 _IntSurf_InteriorPointTool_HeaderFile
#define _IntSurf_InteriorPointTool_HeaderFile

#include "Standard.hxx"
#include "Standard_DefineAlloc.hxx"

#include "gp_Pnt.hxx"
#include "gp_Vec.hxx"
#include "gp_Dir2d.hxx"
class IntSurf_InteriorPoint;

//! This class provides a tool on the "interior point"
//! that can be used to instantiates the Walking
//! algorithms (see package IntWalk).
class IntSurf_InteriorPointTool
{
public:
  DEFINE_STANDARD_ALLOC

  //! Returns the 3d coordinates of the starting point.
  static gp_Pnt Value3d(const IntSurf_InteriorPoint& PStart);

  //! Returns the <U,V> parameters which are associated
  //! with <P>
  //! it's the parameters which start the marching algorithm
  static void Value2d(const IntSurf_InteriorPoint& PStart, double& U, double& V);

  //! returns the tangent at the intersection in 3d space
  //! associated to <P>
  static gp_Vec Direction3d(const IntSurf_InteriorPoint& PStart);

  //! returns the tangent at the intersection in the
  //! parametric space of the parametrized surface.This tangent
  //! is associated to the value2d
  static gp_Dir2d Direction2d(const IntSurf_InteriorPoint& PStart);
};

#include "IntSurf_InteriorPointTool.lxx"

#endif // _IntSurf_InteriorPointTool_HeaderFile