// Created on: 1995-07-17
// Created by: Laurent BUCHARD
// Copyright (c) 1995-1999 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 _BRepBlend_HCurveTool_HeaderFile
#define _BRepBlend_HCurveTool_HeaderFile

#include <Adaptor3d_Curve.hxx>
#include <GeomAbs_CurveType.hxx>
#include <GeomAbs_Shape.hxx>
#include <gp_Circ.hxx>
#include <gp_Elips.hxx>
#include <gp_Lin.hxx>
#include <gp_Parab.hxx>
#include <gp_Pnt.hxx>
#include <gp_Vec.hxx>
#include <gp_Hypr.hxx>
#include <TColStd_Array1OfReal.hxx>

class BRepBlend_HCurveTool
{
public:
  DEFINE_STANDARD_ALLOC

  static Standard_Real FirstParameter(const Handle(Adaptor3d_Curve)& C);

  static Standard_Real LastParameter(const Handle(Adaptor3d_Curve)& C);

  static GeomAbs_Shape Continuity(const Handle(Adaptor3d_Curve)& C);

  //! Returns  the number  of  intervals for  continuity
  //! <S>. May be one if Continuity(myclass) >= <S>
  static Standard_Integer NbIntervals(const Handle(Adaptor3d_Curve)& C, const GeomAbs_Shape S);

  //! Stores in <T> the  parameters bounding the intervals
  //! of continuity <S>.
  //!
  //! The array must provide  enough room to  accommodate
  //! for the parameters. i.e. T.Length() > NbIntervals()
  static void Intervals(const Handle(Adaptor3d_Curve)& C,
                        TColStd_Array1OfReal&          T,
                        const GeomAbs_Shape            S);

  static Standard_Boolean IsClosed(const Handle(Adaptor3d_Curve)& C);

  static Standard_Boolean IsPeriodic(const Handle(Adaptor3d_Curve)& C);

  static Standard_Real Period(const Handle(Adaptor3d_Curve)& C);

  //! Computes the point of parameter U on the curve.
  static gp_Pnt Value(const Handle(Adaptor3d_Curve)& C, const Standard_Real U);

  //! Computes the point of parameter U on the curve.
  static void D0(const Handle(Adaptor3d_Curve)& C, const Standard_Real U, gp_Pnt& P);

  //! Computes the point of parameter U on the curve with its
  //! first derivative.
  //! Raised if the continuity of the current interval
  //! is not C1.
  static void D1(const Handle(Adaptor3d_Curve)& C, const Standard_Real U, gp_Pnt& P, gp_Vec& V);

  //! Returns the point P of parameter U, the first and second
  //! derivatives V1 and V2.
  //! Raised if the continuity of the current interval
  //! is not C2.
  static void D2(const Handle(Adaptor3d_Curve)& C,
                 const Standard_Real            U,
                 gp_Pnt&                        P,
                 gp_Vec&                        V1,
                 gp_Vec&                        V2);

  //! Returns the point P of parameter U, the first, the second
  //! and the third derivative.
  //! Raised if the continuity of the current interval
  //! is not C3.
  static void D3(const Handle(Adaptor3d_Curve)& C,
                 const Standard_Real            U,
                 gp_Pnt&                        P,
                 gp_Vec&                        V1,
                 gp_Vec&                        V2,
                 gp_Vec&                        V3);

  //! The returned vector gives the value of the derivative for the
  //! order of derivation N.
  //! Raised if the continuity of the current interval
  //! is not CN.
  //! Raised if N < 1.
  static gp_Vec DN(const Handle(Adaptor3d_Curve)& C,
                   const Standard_Real            U,
                   const Standard_Integer         N);

  //! Returns the parametric  resolution corresponding
  //! to the real space resolution <R3d>.
  static Standard_Real Resolution(const Handle(Adaptor3d_Curve)& C, const Standard_Real R3d);

  //! Returns  the  type of the   curve  in the  current
  //! interval :   Line,   Circle,   Ellipse, Hyperbola,
  //! Parabola, BezierCurve, BSplineCurve, OtherCurve.
  static GeomAbs_CurveType GetType(const Handle(Adaptor3d_Curve)& C);

  static gp_Lin Line(const Handle(Adaptor3d_Curve)& C);

  static gp_Circ Circle(const Handle(Adaptor3d_Curve)& C);

  static gp_Elips Ellipse(const Handle(Adaptor3d_Curve)& C);

  static gp_Hypr Hyperbola(const Handle(Adaptor3d_Curve)& C);

  static gp_Parab Parabola(const Handle(Adaptor3d_Curve)& C);

  static Handle(Geom_BezierCurve) Bezier(const Handle(Adaptor3d_Curve)& C);

  static Handle(Geom_BSplineCurve) BSpline(const Handle(Adaptor3d_Curve)& C);

  Standard_EXPORT static Standard_Integer NbSamples(const Handle(Adaptor3d_Curve)& C,
                                                    const Standard_Real            U0,
                                                    const Standard_Real            U1);

protected:
private:
};

#include <BRepBlend_HCurveTool.lxx>

#endif // _BRepBlend_HCurveTool_HeaderFile
