// Created on: 1997-07-11
// Created by: Philippe MANGIN
// Copyright (c) 1997-1999 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 _GeomFill_CircularBlendFunc_HeaderFile
#define _GeomFill_CircularBlendFunc_HeaderFile

#include "Standard.hxx"
#include "Standard_Type.hxx"

#include "gp_Pnt.hxx"
#include "Standard_Integer.hxx"
#include "Convert_ParameterisationType.hxx"
#include "Approx_SweepFunction.hxx"
#include "NCollection_Array1.hxx"
#include "gp_Pnt2d.hxx"
#include "gp_Vec.hxx"
#include "gp_Vec2d.hxx"
#include "GeomAbs_Shape.hxx"

//! Circular Blend Function to approximate by
//! SweepApproximation from Approx
class GeomFill_CircularBlendFunc : public Approx_SweepFunction
{

public:
  //! Create a Blend with a constant radius with 2
  //! guide-line. <FShape> sets the type of fillet
  //! surface. The default value is Convert_TgtThetaOver2
  //! (classical nurbs representation of circles).
  //! ChFi3d_QuasiAngular corresponds to a nurbs
  //! representation of circles which parameterisation
  //! matches the circle one. ChFi3d_Polynomial
  //! corresponds to a polynomial representation of
  //! circles.
  Standard_EXPORT GeomFill_CircularBlendFunc(const occ::handle<Adaptor3d_Curve>& Path,
                                             const occ::handle<Adaptor3d_Curve>& Curve1,
                                             const occ::handle<Adaptor3d_Curve>& Curve2,
                                             const double                        Radius,
                                             const bool Polynomial = false);

  //! compute the section for v = param
  Standard_EXPORT bool D0(const double                  Param,
                          const double                  First,
                          const double                  Last,
                          NCollection_Array1<gp_Pnt>&   Poles,
                          NCollection_Array1<gp_Pnt2d>& Poles2d,
                          NCollection_Array1<double>&   Weigths) override;

  //! compute the first derivative in v direction of the
  //! section for v = param
  Standard_EXPORT bool D1(const double                  Param,
                          const double                  First,
                          const double                  Last,
                          NCollection_Array1<gp_Pnt>&   Poles,
                          NCollection_Array1<gp_Vec>&   DPoles,
                          NCollection_Array1<gp_Pnt2d>& Poles2d,
                          NCollection_Array1<gp_Vec2d>& DPoles2d,
                          NCollection_Array1<double>&   Weigths,
                          NCollection_Array1<double>&   DWeigths) override;

  //! compute the second derivative in v direction of the
  //! section for v = param
  Standard_EXPORT bool D2(const double                  Param,
                          const double                  First,
                          const double                  Last,
                          NCollection_Array1<gp_Pnt>&   Poles,
                          NCollection_Array1<gp_Vec>&   DPoles,
                          NCollection_Array1<gp_Vec>&   D2Poles,
                          NCollection_Array1<gp_Pnt2d>& Poles2d,
                          NCollection_Array1<gp_Vec2d>& DPoles2d,
                          NCollection_Array1<gp_Vec2d>& D2Poles2d,
                          NCollection_Array1<double>&   Weigths,
                          NCollection_Array1<double>&   DWeigths,
                          NCollection_Array1<double>&   D2Weigths) override;

  //! get the number of 2d curves to approximate.
  Standard_EXPORT int Nb2dCurves() const override;

  //! get the format of an section
  Standard_EXPORT void SectionShape(int& NbPoles, int& NbKnots, int& Degree) const override;

  //! get the Knots of the section
  Standard_EXPORT void Knots(NCollection_Array1<double>& TKnots) const override;

  //! get the Multplicities of the section
  Standard_EXPORT void Mults(NCollection_Array1<int>& TMults) const override;

  //! Returns if the section is rational or not
  Standard_EXPORT bool IsRational() const override;

  //! Returns the number of intervals for continuity
  //! <S>. May be one if Continuity(me) >= <S>
  Standard_EXPORT int NbIntervals(const GeomAbs_Shape S) const override;

  //! 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()
  Standard_EXPORT void Intervals(NCollection_Array1<double>& T,
                                 const GeomAbs_Shape         S) const override;

  //! Sets the bounds of the parametric interval on
  //! the fonction
  //! This determines the derivatives in these values if the
  //! function is not Cn.
  Standard_EXPORT void SetInterval(const double First, const double Last) override;

  //! Returns the tolerance to reach in approximation
  //! to respect
  //! BoundTol error at the Boundary
  //! AngleTol tangent error at the Boundary (in radian)
  //! SurfTol error inside the surface.
  Standard_EXPORT void GetTolerance(const double                BoundTol,
                                    const double                SurfTol,
                                    const double                AngleTol,
                                    NCollection_Array1<double>& Tol3d) const override;

  //! Is useful, if (me) has to be run numerical
  //! algorithm to perform D0, D1 or D2
  Standard_EXPORT void SetTolerance(const double Tol3d, const double Tol2d) override;

  //! Get the barycentre of Surface. A very poor
  //! estimation is sufficient. This information is useful
  //! to perform well conditioned rational approximation.
  Standard_EXPORT gp_Pnt BarycentreOfSurf() const override;

  //! Returns the length of the maximum section. This
  //! information is useful to perform well conditioned rational
  //! approximation.
  Standard_EXPORT double MaximalSection() const override;

  //! Compute the minimal value of weight for each poles
  //! of all sections. This information is useful to
  //! perform well conditioned rational approximation.
  Standard_EXPORT void GetMinimalWeight(NCollection_Array1<double>& Weigths) const override;

  DEFINE_STANDARD_RTTIEXT(GeomFill_CircularBlendFunc, Approx_SweepFunction)

private:
  Standard_EXPORT void Discret();

  gp_Pnt                       myBary;
  double                       myRadius;
  double                       maxang;
  double                       minang;
  double                       distmin;
  occ::handle<Adaptor3d_Curve> myPath;
  occ::handle<Adaptor3d_Curve> myCurve1;
  occ::handle<Adaptor3d_Curve> myCurve2;
  occ::handle<Adaptor3d_Curve> myTPath;
  occ::handle<Adaptor3d_Curve> myTCurve1;
  occ::handle<Adaptor3d_Curve> myTCurve2;
  int                          myDegree;
  int                          myNbKnots;
  int                          myNbPoles;
  Convert_ParameterisationType myTConv;
  bool                         myreverse;
};

#endif // _GeomFill_CircularBlendFunc_HeaderFile