// Created on: 2000-05-22
// Created by: Peter KURNEV
// Copyright (c) 2000-2014 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 _IntTools_Root_HeaderFile
#define _IntTools_Root_HeaderFile

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

#include "Standard_Real.hxx"
#include "TopAbs_State.hxx"
#include "Standard_Boolean.hxx"

//! The class is to describe the root of
//! function of one variable for Edge/Edge
//! and Edge/Surface algorithms.
class IntTools_Root
{
public:
  DEFINE_STANDARD_ALLOC

  //! Empty constructor
  Standard_EXPORT IntTools_Root();

  //! Initializes my by range of parameters
  //! and type of root
  Standard_EXPORT IntTools_Root(const double aRoot, const int aType);

  //! Sets the Root's value
  Standard_EXPORT void SetRoot(const double aRoot);

  //! Sets the Root's Type
  Standard_EXPORT void SetType(const int aType);

  //! Set the value of the state before the root
  //! (at t=Root-dt)
  Standard_EXPORT void SetStateBefore(const TopAbs_State aState);

  //! Set the value of the state after the root
  //! (at t=Root-dt)
  Standard_EXPORT void SetStateAfter(const TopAbs_State aState);

  //! Not used in Edge/Edge algorithm
  Standard_EXPORT void SetLayerHeight(const double aHeight);

  //! Sets the interval from which the Root was
  //! found [t1,t2] and the corresponding values
  //! of the function on the bounds f(t1), f(t2).
  Standard_EXPORT void SetInterval(const double t1,
                                   const double t2,
                                   const double f1,
                                   const double f2);

  //! Returns the Root value
  Standard_EXPORT double Root() const;

  //! Returns the type of the root
  //! =0 - Simple (was found by bisection method);
  //! =2 - Smart when f1=0, f2!=0 or vice versa
  //! (was found by Fibbonacci method);
  //! =1 - Pure (pure zero for all t [t1,t2]);
  Standard_EXPORT int Type() const;

  //! Returns the state before the root
  Standard_EXPORT TopAbs_State StateBefore() const;

  //! Returns the state after the root
  Standard_EXPORT TopAbs_State StateAfter() const;

  //! Not used in Edge/Edge algorithm
  Standard_EXPORT double LayerHeight() const;

  //! Returns the validity flag for the root,
  //! True if
  //! myStateBefore==TopAbs_OUT && myStateAfter==TopAbs_IN or
  //! myStateBefore==TopAbs_OUT && myStateAfter==TopAbs_ON or
  //! myStateBefore==TopAbs_ON  && myStateAfter==TopAbs_OUT or
  //! myStateBefore==TopAbs_IN  && myStateAfter==TopAbs_OUT
  //! For other cases it returns False.
  Standard_EXPORT bool IsValid() const;

  //! Returns the values of interval from which the Root was
  //! found [t1,t2] and the corresponding values
  //! of the function on the bounds f(t1), f(t2).
  Standard_EXPORT void Interval(double& t1, double& t2, double& f1, double& f2) const;

private:
  double       myRoot;
  int          myType;
  double       myLayerHeight;
  TopAbs_State myStateBefore;
  TopAbs_State myStateAfter;
  double       myt1;
  double       myt2;
  double       myf1;
  double       myf2;
};

#endif // _IntTools_Root_HeaderFile