// Created on: 1994-09-05
// Created by: Yves FRICAUD
// Copyright (c) 1994-1999 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.

#include <Geom2dLProp_NumericCurInf2d.ixx>

#include <Geom2dLProp_FuncCurExt.hxx>
#include <Geom2dLProp_FuncCurNul.hxx>

#include <Geom2dLProp_Curve2dTool.hxx>
#include <math_FunctionRoots.hxx>
#include <math_BracketedRoot.hxx>
#include <Precision.hxx>

//=======================================================================
//function : 
//purpose  : 
//=======================================================================
Geom2dLProp_NumericCurInf2d::Geom2dLProp_NumericCurInf2d()
{
}
//=======================================================================
//function : PerformCurExt
//purpose  : 
//=======================================================================
void Geom2dLProp_NumericCurInf2d::PerformCurExt (const Handle(Geom2d_Curve)& C,LProp_CurAndInf& Result)
{
  PerformCurExt(C,Geom2dLProp_Curve2dTool::FirstParameter(C),Geom2dLProp_Curve2dTool::LastParameter(C),Result);
}

//=======================================================================
//function : PerformCurExt
//purpose  : 
//=======================================================================
void Geom2dLProp_NumericCurInf2d::PerformCurExt (const Handle(Geom2d_Curve)& C,
                                                 const Standard_Real UMin,
                                                 const Standard_Real UMax,
                                                 LProp_CurAndInf&    Result)
{
  isDone = Standard_True;

  Standard_Real    EpsH = 1.e-4*(UMax - UMin);
  Standard_Real    Tol  = Precision::PConfusion();

  // la premiere recherce se fait avec une tolerance assez grande
  // car la derivee de la fonction est estimee assez grossierement.

  Geom2dLProp_FuncCurExt    F(C,EpsH);
  Standard_Integer NbSamples = 100;
  Standard_Boolean SolType;

  math_FunctionRoots SolRoot (F,UMin,UMax,NbSamples,EpsH,EpsH,EpsH);

  if (SolRoot.IsDone()) {
    for (Standard_Integer j = 1; j <= SolRoot.NbSolutions(); j++) {
      Standard_Real Param = SolRoot.Value(j);
      // la solution est affinee.
      math_BracketedRoot BS (F,
        Param - EpsH,
        Param + EpsH,
        Tol);
      if (BS.IsDone()) {Param = BS.Root();}
      SolType = F.IsMinKC(Param);
      Result.AddExtCur(Param,SolType);
    }
  }
  else {
    isDone = Standard_False;
  }
}

//=======================================================================
//function : PerformInf
//purpose  : 
//=======================================================================
void Geom2dLProp_NumericCurInf2d::PerformInf(const Handle(Geom2d_Curve)& C,LProp_CurAndInf& Result)
{  
  PerformInf(C,Geom2dLProp_Curve2dTool::FirstParameter(C),Geom2dLProp_Curve2dTool::LastParameter(C),Result);
}

//=======================================================================
//function : PerformInf
//purpose  : 
//=======================================================================
void Geom2dLProp_NumericCurInf2d::PerformInf(const Handle(Geom2d_Curve)& C,					 
                                             const Standard_Real UMin,
                                             const Standard_Real UMax,
                                             LProp_CurAndInf& Result)
{
  isDone = Standard_True;
  Geom2dLProp_FuncCurNul    F(C);
  Standard_Real    EpsX = 1.e-6;
  Standard_Real    EpsF = 1.e-6;
  Standard_Integer NbSamples = 30;

  math_FunctionRoots SolRoot (F,UMin,UMax,NbSamples,EpsX,EpsF,EpsX);

  if (SolRoot.IsDone()) {
    for (Standard_Integer j = 1; j <= SolRoot.NbSolutions(); j++) {
      Result.AddInflection(SolRoot.Value(j));
    }
  }
  else {
    isDone = Standard_False;
  }  
}

//=======================================================================
//function : IsDone
//purpose  : 
//=======================================================================
Standard_Boolean Geom2dLProp_NumericCurInf2d::IsDone() const
{
  return isDone;
}