OCCT

// Created: 2009-01-20
//
// Copyright (c) 2009-2013 OPEN CASCADE SAS
//
// This file is part of commercial software by OPEN CASCADE SAS,
// furnished in accordance with the terms and conditions of the contract
// and with the inclusion of this copyright notice.
// This file or any part thereof may not be provided or otherwise
// made available to any third party.
//
// No ownership title to the software is transferred hereby.
//
// OPEN CASCADE SAS makes no representation or warranties with respect to the
// performance of this software, and specifically disclaims any responsibility
// for any damages, special or consequential, connected with its use.

#ifndef _Geom2dConvert_ApproxArcsSegments_HeaderFile
#define _Geom2dConvert_ApproxArcsSegments_HeaderFile

#include <Geom2d_Curve.hxx>
#include <NCollection_Sequence.hxx>
#include <Geom2dConvert_PPoint.hxx>
#include <Geom2d_TrimmedCurve.hxx>
class Geom2dConvert_PPoint;

//! Approximation of a free-form curve by a sequence of arcs+segments.
class Geom2dConvert_ApproxArcsSegments
{
public:
  // ---------- PUBLIC METHODS ----------

  enum Status
  {
    StatusOK = 0,
    StatusNotDone,
    StatusError
  };

  //! Constructor.
  Standard_EXPORT Geom2dConvert_ApproxArcsSegments(const Adaptor2d_Curve2d& theCurve,
                                                   const double             theTolerance,
                                                   const double             theAngleTol);

  //! Get the result curve after approximation.
  const NCollection_Sequence<occ::handle<Geom2d_Curve>>& GetResult() const { return mySeqCurves; }

private:
  //! Create arc of circle by three points (knowing that myCurve is circle).
  occ::handle<Geom2d_Curve> makeCircle(const Geom2dConvert_PPoint& theFirst,
                                       const Geom2dConvert_PPoint& theLast) const;

  //! Create an arc of circle using 2 points and a derivative in the first point.
  bool makeArc(const Geom2dConvert_PPoint&       theParam1,
               Geom2dConvert_PPoint&             theParam2,
               const bool                        isFirst,
               occ::handle<Geom2d_TrimmedCurve>& theCurve) const;

  //! Make a line from myCurve in the limits by parameter from theFirst to theLast
  occ::handle<Geom2d_TrimmedCurve> makeLine(Geom2dConvert_PPoint& theFirst,
                                            Geom2dConvert_PPoint& theLast,
                                            const bool            isCheck) const;

  //! Create a sequence of elementary curves from a free-form adaptor curve.
  bool makeFreeform();

  //! Obtain the linear intervals on the curve using as criteria
  //! curvature tolerance (indicating either linear part or inflection)
  void getLinearParts(NCollection_Sequence<Geom2dConvert_PPoint>& theSeqParam);

  //! Dichotomic search of the boundary of inflection interval, between
  //! two parameters on the Curve
  Geom2dConvert_PPoint findInflection(const Geom2dConvert_PPoint& theParamIsIn,
                                      const Geom2dConvert_PPoint& theParamNoIn) const;

  //! Make approximation non-linear part of the other curve.
  bool makeApproximation(Geom2dConvert_PPoint& theFirstParam, Geom2dConvert_PPoint& theLastParam);

  //! Method for calculation of a biarc.
  bool calculateBiArcs(Geom2dConvert_PPoint& theFirstParam, Geom2dConvert_PPoint& theLastParam);

  //! Method for calculation of a linear interpolation.
  bool calculateLines(Geom2dConvert_PPoint& theFirstParam, Geom2dConvert_PPoint& theLastParam);

  //! Checking max deflection Geom curve from Adaptor Curve
  bool checkCurve(const occ::handle<Geom2d_Curve>& aCurve,
                  const double                     theFirstParam,
                  const double                     theLastParam) const;

private:
  // ---------- PRIVATE FIELDS ----------

  const Adaptor2d_Curve2d& myCurve;
  Geom2dConvert_PPoint     myExt[2];

  occ::handle<NCollection_BaseAllocator> myAlloc;
  double                                 myTolerance;
  double                                 myAngleTolerance;

  NCollection_Sequence<Geom2dConvert_PPoint>      mySeqParams;
  NCollection_Sequence<occ::handle<Geom2d_Curve>> mySeqCurves;
  Status                                          myStatus;

  //! Protection against compiler warning
  void operator=(const Geom2dConvert_ApproxArcsSegments&) = delete;
};

#endif