// Created on: 1992-01-20
// Created by: Remi GILET
// 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.


#include <Geom2dAdaptor_Curve.hxx>
#include <Geom2dGcc_CurveTool.hxx>
#include <Geom2dGcc_FunctionTanObl.hxx>
#include <gp_Dir2d.hxx>
#include <gp_Pnt2d.hxx>
#include <gp_Vec2d.hxx>

Geom2dGcc_FunctionTanObl::
Geom2dGcc_FunctionTanObl(const Geom2dAdaptor_Curve& C,
                         const gp_Dir2d& Dir    )
{
  TheCurv = C;
  TheDirection = Dir;
}


Standard_Boolean Geom2dGcc_FunctionTanObl::
Value (const Standard_Real  X,
       Standard_Real& Fval ) {
         gp_Pnt2d Point;
         gp_Vec2d Vect;
         Geom2dGcc_CurveTool::D1(TheCurv,X,Point,Vect);
         Standard_Real NormeD1 = Vect.Magnitude();
         Fval = TheDirection.XY().Crossed(Vect.XY())/NormeD1;
         return Standard_True;
}

Standard_Boolean Geom2dGcc_FunctionTanObl::
Derivative (const Standard_Real  X,
            Standard_Real& Deriv )
{
  gp_Pnt2d Point;
  gp_Vec2d Vec1;
  gp_Vec2d Vec2;
  Geom2dGcc_CurveTool::D2(TheCurv,X,Point,Vec1,Vec2);
  Standard_Real NormeD1 = Vec1.Magnitude();
  Deriv = TheDirection.XY().Crossed(Vec2.XY())/NormeD1-
    Vec1.XY().Dot(Vec2.XY())*TheDirection.XY().Crossed(Vec1.XY())/NormeD1;
  return Standard_True;
}

Standard_Boolean Geom2dGcc_FunctionTanObl::
Values (const Standard_Real  X     ,
        Standard_Real& Fval  ,
        Standard_Real& Deriv ) {
          gp_Pnt2d Point;
          gp_Vec2d Vec1;
          gp_Vec2d Vec2;
          Geom2dGcc_CurveTool::D2(TheCurv,X,Point,Vec1,Vec2);
          Standard_Real NormeD1 = Vec1.Magnitude();
          Fval = TheDirection.XY().Crossed(Vec1.XY())/NormeD1;
          Deriv = TheDirection.XY().Crossed(Vec2.XY())/NormeD1-
            Vec1.XY().Dot(Vec2.XY())*TheDirection.XY().Crossed(Vec1.XY())/NormeD1;
          return Standard_True;
}