// Created on: 1996-08-09
// Created by: Herve LOUESSARD
// Copyright (c) 1996-1999 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 _LocalAnalysis_CurveContinuity_HeaderFile
#define _LocalAnalysis_CurveContinuity_HeaderFile

#include "Standard.hxx"
#include "Standard_DefineAlloc.hxx"
#include "Standard_Handle.hxx"

#include "GeomAbs_Shape.hxx"
#include "LocalAnalysis_StatusErrorType.hxx"
class Geom_Curve;
#include "GeomLProp_CLProps.hxx"

//! This class gives tools to check local continuity C0
//! C1 C2 G1 G2 between two points situated on two curves
class LocalAnalysis_CurveContinuity
{
public:
  DEFINE_STANDARD_ALLOC

  //! -u1 is the parameter of the point on Curv1
  //! -u2 is the parameter of the point on Curv2
  //! -Order is the required continuity:
  //! GeomAbs_C0 GeomAbs_C1 GeomAbs_C2
  //! GeomAbs_G1 GeomAbs_G2
  //!
  //! -EpsNul is used to detect a vector with null
  //! magnitude (in mm)
  //!
  //! -EpsC0 is used for C0 continuity to confuse two
  //! points (in mm)
  //!
  //! -EpsC1 is an angular tolerance in radians used
  //! for C1 continuity to compare the angle between
  //! the first derivatives
  //!
  //! -EpsC2 is an angular tolerance in radians used
  //! for C2 continuity to compare the angle between
  //! the second derivatives
  //!
  //! -EpsG1 is an angular tolerance in radians used
  //! for G1 continuity to compare the angle between
  //! the tangents
  //!
  //! -EpsG2 is an angular tolerance in radians used
  //! for G2 continuity to compare the angle between
  //! the normals
  //!
  //! - percent: percentage of curvature variation (unitless)
  //! used for G2 continuity
  //!
  //! - Maxlen is the maximum length of Curv1 or Curv2 in
  //! meters used to detect nul curvature (in mm)
  //!
  //! the constructor computes the quantities which are
  //! necessary to check the continuity in the following cases:
  //!
  //! case C0
  //! -------
  //! - the distance between P1 and P2 with P1=Curv1 (u1) and
  //! P2=Curv2(u2)
  //!
  //! case C1
  //! -------
  //!
  //! - the angle between the first derivatives
  //! dCurv1(u1)           dCurv2(u2)
  //! --------     and     ---------
  //! du                   du
  //!
  //! - the ratio between the magnitudes of the first
  //! derivatives
  //!
  //! the angle value is between 0 and PI/2
  //!
  //! case C2
  //! -------
  //! - the angle between the second derivatives
  //! 2                   2
  //! d  Curv1(u1)       d Curv2(u2)
  //! ----------        ----------
  //! 2                   2
  //! du                  du
  //!
  //! the angle value is between 0 and PI/2
  //!
  //! - the ratio between the magnitudes of the second
  //! derivatives
  //!
  //! case G1
  //! -------
  //! the angle between the tangents at each point
  //!
  //! the angle value is between 0 and PI/2
  //!
  //! case G2
  //! -------
  //! -the angle between the normals at each point
  //!
  //! the angle value is between 0 and PI/2
  //!
  //! - the relative variation of curvature:
  //! |curvat1-curvat2|
  //! ------------------
  //! 1/2
  //! (curvat1*curvat2)
  //!
  //! where curvat1 is the curvature at the first point
  //! and curvat2 the curvature at the second point
  Standard_EXPORT LocalAnalysis_CurveContinuity(const occ::handle<Geom_Curve>& Curv1,
                                                const double                   u1,
                                                const occ::handle<Geom_Curve>& Curv2,
                                                const double                   u2,
                                                const GeomAbs_Shape            Order,
                                                const double                   EpsNul  = 0.001,
                                                const double                   EpsC0   = 0.001,
                                                const double                   EpsC1   = 0.001,
                                                const double                   EpsC2   = 0.001,
                                                const double                   EpsG1   = 0.001,
                                                const double                   EpsG2   = 0.001,
                                                const double                   Percent = 0.01,
                                                const double                   Maxlen  = 10000);

  Standard_EXPORT bool IsDone() const;

  Standard_EXPORT LocalAnalysis_StatusErrorType StatusError() const;

  Standard_EXPORT GeomAbs_Shape ContinuityStatus() const;

  Standard_EXPORT double C0Value() const;

  Standard_EXPORT double C1Angle() const;

  Standard_EXPORT double C1Ratio() const;

  Standard_EXPORT double C2Angle() const;

  Standard_EXPORT double C2Ratio() const;

  Standard_EXPORT double G1Angle() const;

  Standard_EXPORT double G2Angle() const;

  Standard_EXPORT double G2CurvatureVariation() const;

  Standard_EXPORT bool IsC0() const;

  Standard_EXPORT bool IsC1() const;

  Standard_EXPORT bool IsC2() const;

  Standard_EXPORT bool IsG1() const;

  Standard_EXPORT bool IsG2() const;

private:
  Standard_EXPORT void CurvC0(GeomLProp_CLProps& Curv1, GeomLProp_CLProps& Curv2);

  Standard_EXPORT void CurvC1(GeomLProp_CLProps& Curv1, GeomLProp_CLProps& Curv2);

  Standard_EXPORT void CurvC2(GeomLProp_CLProps& Curv1, GeomLProp_CLProps& Curv2);

  Standard_EXPORT void CurvG1(GeomLProp_CLProps& Curv1, GeomLProp_CLProps& Curv2);

  Standard_EXPORT void CurvG2(GeomLProp_CLProps& Curv1, GeomLProp_CLProps& Curv2);

  double                        myContC0;
  double                        myContC1;
  double                        myContC2;
  double                        myContG1;
  double                        myContG2;
  double                        myCourbC1;
  double                        myCourbC2;
  double                        myG2Variation;
  double                        myLambda1;
  double                        myLambda2;
  GeomAbs_Shape                 myTypeCont;
  double                        myepsnul;
  double                        myepsC0;
  double                        myepsC1;
  double                        myepsC2;
  double                        myepsG1;
  double                        myepsG2;
  double                        myMaxLon;
  double                        myperce;
  bool                          myIsDone;
  LocalAnalysis_StatusErrorType myErrorStatus;
};

#endif // _LocalAnalysis_CurveContinuity_HeaderFile