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 // Created on: 1995-06-02
 // Created by: Xavier BENVENISTE
 // 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 _Approx_SameParameter_HeaderFile
 #define _Approx_SameParameter_HeaderFile
 
 #include <Adaptor3d_CurveOnSurface.hxx>
 #include <Adaptor3d_Surface.hxx>
 
 class Geom_Curve;
 class Geom2d_Curve;
 class Geom_Surface;
 
 //! Approximation of a  PCurve  on a surface to  make its
 //! parameter be the same that the parameter of a given 3d
 //! reference curve.
 class Approx_SameParameter 
 {
 public:
 
   DEFINE_STANDARD_ALLOC
 
   //! Warning: the C3D and C2D must have the same parametric domain.
   Standard_EXPORT Approx_SameParameter(const Handle(Geom_Curve)& C3D,
                                        const Handle(Geom2d_Curve)& C2D,
                                        const Handle(Geom_Surface)& S,
                                        const Standard_Real Tol);
 
   //! Warning: the C3D and C2D must have the same parametric domain.
   Standard_EXPORT Approx_SameParameter(const Handle(Adaptor3d_Curve)& C3D,
                                        const Handle(Geom2d_Curve)& C2D,
                                        const Handle(Adaptor3d_Surface)& S,
                                        const Standard_Real Tol);
 
   //! Warning: the C3D and C2D must have the same parametric domain.
   Standard_EXPORT Approx_SameParameter(const Handle(Adaptor3d_Curve)& C3D,
                                        const Handle(Adaptor2d_Curve2d)& C2D,
                                        const Handle(Adaptor3d_Surface)& S,
                                        const Standard_Real Tol);
 
   //!@Returns .false. if calculations failed,
   //! .true. if calculations succeed
   Standard_Boolean IsDone() const
   {
     return myDone;
   }
 
   //!@Returns tolerance (maximal distance) between 3d curve
   //! and curve on surface, generated by 2d curve and surface. 
   Standard_Real TolReached() const
   {
     return myTolReached;
   }
 
   //! Tells whether the original data had already the same
   //! parameter up to the tolerance : in that case nothing
   //! is done.
   Standard_Boolean IsSameParameter() const
   {
     return mySameParameter;
   }
 
   //! Returns the 2D curve that has the same parameter as
   //! the 3D curve once evaluated on the surface up to the
   //! specified tolerance.
   Handle(Geom2d_Curve) Curve2d() const
   {
     return myCurve2d;
   }
 
   //! Returns the 3D curve that has the same parameter as
   //! the 3D curve once evaluated on the surface up to the
   //! specified tolerance.
   Handle(Adaptor3d_Curve) Curve3d() const
   {
     return myC3d;
   }
 
   //! Returns the 3D curve on surface that has the same parameter as
   //! the 3D curve up to the specified tolerance.
   Handle(Adaptor3d_CurveOnSurface) CurveOnSurface() const
   {
     return myCurveOnSurface;
   }
 
 private:
 
   //! Internal data structure to unify access to the most actively used data.
   //! This structure is not intended to be class field since
   //! a lot of memory is used in intermediate computations.
   struct Approx_SameParameter_Data
   {
     Adaptor3d_CurveOnSurface myCOnS; // Curve on surface.
     Standard_Integer myNbPnt; // Number of points.
     Standard_Real *myPC3d; // Parameters on 3d curve.
     Standard_Real *myPC2d; // Parameters on 2d curve.
 
     // Second data arrays. Used in loop over poles.
     Standard_Real *myNewPC3d; // Parameters on 3d curve.
     Standard_Real *myNewPC2d; // Parameters on 2d curve.
 
     // Parameters ranges.
     Standard_Real myC3dPF; // Curve 3d Parameter First.
     Standard_Real myC3dPL; // Curve 3d Parameter Last.
     Standard_Real myC2dPF; // Curve 2d Parameter First.
     Standard_Real myC2dPL; // Curve 2d Parameter Last.
 
     Standard_Real myTol; // Working tolerance.
 
     // Swap data arrays and update number of points.
     void Swap(const Standard_Integer theNewNbPoints)
     {
       myNbPnt = theNewNbPoints;
       Standard_Real * temp;
 
       // 3-D
       temp = myPC3d;
       myPC3d = myNewPC3d;
       myNewPC3d = temp;
 
       // 2-D
       temp = myPC2d;
       myPC2d = myNewPC2d;
       myNewPC2d = temp;
     }
   };
 
 
   Approx_SameParameter(const Approx_SameParameter &);
   Approx_SameParameter& operator=(const Approx_SameParameter &);
 
   //! Computes the pcurve (internal use only).
   Standard_EXPORT void Build (const Standard_Real Tol);
 
   //! Computes initial point distribution.
   Standard_Boolean BuildInitialDistribution(Approx_SameParameter_Data &theData) const;
 
   //! Increases initial number of samples in case of the C0 continuity.
   //! Return new number of points and corresponding data arrays.
   //@return true if new number of samples is good and false otherwise.
   Standard_Boolean IncreaseInitialNbSamples(Approx_SameParameter_Data &theData) const;
 
   //! Computes tangents on boundary points.
   //@return true if tangents are not null and false otherwise.
   Standard_Boolean ComputeTangents(const Adaptor3d_CurveOnSurface & theCOnS,
                                    Standard_Real &theFirstTangent,
                                    Standard_Real &theLastTangent) const;
 
   //! Method to check same parameter state
   //! and build dependency between 2d and 3d curves.
   //@return true if 2d and 3d curves have same parameter state and false otherwise.
   Standard_Boolean CheckSameParameter(Approx_SameParameter_Data &theData,
                                       Standard_Real &theSqDist) const;
 
   //! Computes interpolated values.
   //!@Returns .false. if computations failed;
   Standard_Boolean Interpolate(const Approx_SameParameter_Data & theData,
                    const Standard_Real aTangFirst,
                    const Standard_Real aTangLast,
                    TColStd_Array1OfReal & thePoles,
                    TColStd_Array1OfReal & theFlatKnots) const;
 
   //! Increases number of poles in poles loop.
   //@return true if poles is changed and false otherwise.
   Standard_Boolean IncreaseNbPoles(const TColStd_Array1OfReal & thePoles,
                                    const TColStd_Array1OfReal & theFlatKnots,
                                    Approx_SameParameter_Data & theData,
                                    Standard_Real &theBestSqTol) const;
 
   static const Standard_Integer myNbSamples = 22; // To be consistent with "checkshape".
   static const Standard_Integer myMaxArraySize = 1000;
   const Standard_Real myDeltaMin; // Initialization is allowed only for integral types.
 
   Standard_Boolean mySameParameter;
   Standard_Boolean myDone;
   Standard_Real myTolReached;
   Handle(Geom2d_Curve) myCurve2d;
   Handle(Adaptor2d_Curve2d) myHCurve2d;
   Handle(Adaptor3d_Curve) myC3d;
   Handle(Adaptor3d_Surface) mySurf;
   Handle(Adaptor3d_CurveOnSurface) myCurveOnSurface;
 };
 
 #endif // _Approx_SameParameter_HeaderFile

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