// Created on: 1992-03-26
// Created by: Laurent BUCHARD
// 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 _IntCurve_IConicTool_HeaderFile
#define _IntCurve_IConicTool_HeaderFile

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

#include <gp_Ax22d.hxx>
#include <GeomAbs_CurveType.hxx>
#include <gp_Trsf2d.hxx>
class gp_Elips2d;
class gp_Lin2d;
class gp_Circ2d;
class gp_Parab2d;
class gp_Hypr2d;
class gp_Pnt2d;
class gp_Vec2d;

//! Implementation of the ImpTool from IntImpParGen
//! for conics of gp.
class IntCurve_IConicTool
{
public:
  DEFINE_STANDARD_ALLOC

  Standard_EXPORT IntCurve_IConicTool();

  Standard_EXPORT IntCurve_IConicTool(const IntCurve_IConicTool& IT);

  Standard_EXPORT IntCurve_IConicTool(const gp_Elips2d& E);

  Standard_EXPORT IntCurve_IConicTool(const gp_Lin2d& L);

  Standard_EXPORT IntCurve_IConicTool(const gp_Circ2d& C);

  Standard_EXPORT IntCurve_IConicTool(const gp_Parab2d& P);

  Standard_EXPORT IntCurve_IConicTool(const gp_Hypr2d& H);

  Standard_EXPORT gp_Pnt2d Value(const double X) const;

  Standard_EXPORT void D1(const double U, gp_Pnt2d& P, gp_Vec2d& T) const;

  Standard_EXPORT void D2(const double U, gp_Pnt2d& P, gp_Vec2d& T, gp_Vec2d& N) const;

  //! Computes the value of the signed distance between
  //! the point P and the implicit curve.
  Standard_EXPORT double Distance(const gp_Pnt2d& P) const;

  //! Computes the Gradient of the Signed Distance
  //! between a point and the implicit curve, at the
  //! point P.
  Standard_EXPORT gp_Vec2d GradDistance(const gp_Pnt2d& P) const;

  //! Returns the parameter U of the point on the implicit curve corresponding to the point P.
  //! The correspondence between P and the point P(U) on the
  //! implicit curve must be coherent with the way of determination of the signed distance.
  Standard_EXPORT double FindParameter(const gp_Pnt2d& P) const;

private:
  double            prm1;
  double            prm2;
  double            prm3;
  gp_Ax22d          Axis;
  GeomAbs_CurveType type;
  gp_Trsf2d         Abs_To_Object;
};

#endif // _IntCurve_IConicTool_HeaderFile
