// Created on: 1997-02-12
// Created by: Laurent BOURESCHE
// 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 _Blend_SurfPointFuncInv_HeaderFile
#define _Blend_SurfPointFuncInv_HeaderFile

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

#include <math_FunctionSetWithDerivatives.hxx>
#include <Standard_Integer.hxx>
#include <Standard_Boolean.hxx>
#include <math_Vector.hxx>
#include <Standard_Real.hxx>
class math_Matrix;
class gp_Pnt;


//! Deferred   class  for a  function  used  to compute  a
//! blending surface between a  surface and a curve, using
//! a  guide  line.   This   function is  used  to find  a
//! solution on a done point of the curve.
//!
//! The vector <X>  used in Value, Values and  Derivatives
//! methods  has  to   be the  vector   of the  parametric
//! coordinates w, U,  V where w is  the parameter  on the
//! guide line, U,V   are the parametric coordinates of  a
//! point on the partner surface.
class Blend_SurfPointFuncInv  : public math_FunctionSetWithDerivatives
{
public:

  DEFINE_STANDARD_ALLOC

  
  //! Returns 3.
  Standard_EXPORT Standard_Integer NbVariables() const;
  
  //! returns the number of equations of the function.
  Standard_EXPORT virtual Standard_Integer NbEquations() const = 0;
  
  //! computes the values <F> of the Functions for the
  //! variable <X>.
  //! Returns True if the computation was done successfully,
  //! False otherwise.
  Standard_EXPORT virtual Standard_Boolean Value (const math_Vector& X, math_Vector& F) = 0;
  
  //! returns the values <D> of the derivatives for the
  //! variable <X>.
  //! Returns True if the computation was done successfully,
  //! False otherwise.
  Standard_EXPORT virtual Standard_Boolean Derivatives (const math_Vector& X, math_Matrix& D) = 0;
  
  //! returns the values <F> of the functions and the derivatives
  //! <D> for the variable <X>.
  //! Returns True if the computation was done successfully,
  //! False otherwise.
  Standard_EXPORT virtual Standard_Boolean Values (const math_Vector& X, math_Vector& F, math_Matrix& D) = 0;
  
  //! Set the Point on which a solution has to be found.
  Standard_EXPORT virtual void Set (const gp_Pnt& P) = 0;
  
  //! Returns in the vector Tolerance the parametric tolerance
  //! for each of the 3 variables;
  //! Tol is the tolerance used in 3d space.
  Standard_EXPORT virtual void GetTolerance (math_Vector& Tolerance, const Standard_Real Tol) const = 0;
  
  //! Returns in the vector InfBound the lowest values allowed
  //! for each of the 3 variables.
  //! Returns in the vector SupBound the greatest values allowed
  //! for each of the 3 variables.
  Standard_EXPORT virtual void GetBounds (math_Vector& InfBound, math_Vector& SupBound) const = 0;
  
  //! Returns Standard_True if Sol is a zero of the function.
  //! Tol is the tolerance used in 3d space.
  Standard_EXPORT virtual Standard_Boolean IsSolution (const math_Vector& Sol, const Standard_Real Tol) = 0;




protected:





private:





};







#endif // _Blend_SurfPointFuncInv_HeaderFile
