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 // Created on: 1992-09-01
 // Created by: Modelistation
 // Copyright (c) 1992-1999 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 _GeomAdaptor_Curve_HeaderFile
 #define _GeomAdaptor_Curve_HeaderFile
 
 #include <Adaptor3d_Curve.hxx>
 #include <BSplCLib_Cache.hxx>
 #include <Geom_Curve.hxx>
 #include <GeomAbs_Shape.hxx>
 #include <GeomEvaluator_Curve.hxx>
 #include <Standard_NullObject.hxx>
 #include <Standard_ConstructionError.hxx>
 
 DEFINE_STANDARD_HANDLE(GeomAdaptor_Curve, Adaptor3d_Curve)
 
 //! This class provides an interface between the services provided by any
 //! curve from the package Geom and those required of the curve by algorithms which use it.
 //! Creation of the loaded curve the curve is C1 by piece.
 //!
 //! Polynomial coefficients of BSpline curves used for their evaluation are
 //! cached for better performance. Therefore these evaluations are not
 //! thread-safe and parallel evaluations need to be prevented.
 class GeomAdaptor_Curve  : public Adaptor3d_Curve
 {
   DEFINE_STANDARD_RTTIEXT(GeomAdaptor_Curve, Adaptor3d_Curve)
 public:
 
   GeomAdaptor_Curve() : myTypeCurve (GeomAbs_OtherCurve), myFirst (0.0), myLast (0.0) {}
 
   GeomAdaptor_Curve (const Handle(Geom_Curve)& theCurve)
   {
     Load (theCurve);
   }
 
   //! Standard_ConstructionError is raised if theUFirst>theULast
   GeomAdaptor_Curve (const Handle(Geom_Curve)& theCurve,
                      const Standard_Real theUFirst,
                      const Standard_Real theULast)
   {
     Load (theCurve, theUFirst, theULast);
   }
 
   //! Shallow copy of adaptor
   Standard_EXPORT virtual Handle(Adaptor3d_Curve) ShallowCopy() const Standard_OVERRIDE;
 
   //! Reset currently loaded curve (undone Load()).
   Standard_EXPORT void Reset();
 
   void Load (const Handle(Geom_Curve)& theCurve)
   {
     if (theCurve.IsNull()) { throw Standard_NullObject(); }
     load (theCurve, theCurve->FirstParameter(), theCurve->LastParameter());
   }
 
   //! Standard_ConstructionError is raised if theUFirst>theULast
   void Load (const Handle(Geom_Curve)& theCurve,
              const Standard_Real theUFirst,
              const Standard_Real theULast)
   {
     if (theCurve.IsNull()) { throw Standard_NullObject(); }
     if (theUFirst > theULast) { throw Standard_ConstructionError(); }
     load (theCurve, theUFirst, theULast);
   }
 
   //! Provides a curve inherited from Hcurve from Adaptor.
   //! This is inherited to provide easy to use constructors.
   const Handle(Geom_Curve)& Curve() const { return myCurve; }
 
   virtual Standard_Real FirstParameter() const Standard_OVERRIDE { return myFirst; }
 
   virtual Standard_Real LastParameter() const Standard_OVERRIDE { return myLast; }
 
   Standard_EXPORT GeomAbs_Shape Continuity() const Standard_OVERRIDE;
   
   //! Returns  the number  of  intervals for  continuity
   //! <S>. May be one if Continuity(me) >= <S>
   Standard_EXPORT Standard_Integer NbIntervals (const GeomAbs_Shape S) const Standard_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 (TColStd_Array1OfReal& T, const GeomAbs_Shape S) const Standard_OVERRIDE;
   
   //! Returns    a  curve equivalent   of  <me>  between
   //! parameters <First>  and <Last>. <Tol>  is used  to
   //! test for 3d points confusion.
   //! If <First> >= <Last>
   Standard_EXPORT Handle(Adaptor3d_Curve) Trim (const Standard_Real First, const Standard_Real Last, const Standard_Real Tol) const Standard_OVERRIDE;
   
   Standard_EXPORT Standard_Boolean IsClosed() const Standard_OVERRIDE;
   
   Standard_EXPORT Standard_Boolean IsPeriodic() const Standard_OVERRIDE;
   
   Standard_EXPORT Standard_Real Period() const Standard_OVERRIDE;
   
   //! Computes the point of parameter U on the curve
   Standard_EXPORT gp_Pnt Value (const Standard_Real U) const Standard_OVERRIDE;
   
   //! Computes the point of parameter U.
   Standard_EXPORT void D0 (const Standard_Real U, gp_Pnt& P) const Standard_OVERRIDE;
   
   //! Computes the point of parameter U on the curve
   //! with its first derivative.
   //!
   //! Warning : On the specific case of BSplineCurve:
   //! if the curve is cut in interval of continuity at least C1, the
   //! derivatives are computed on the current interval.
   //! else the derivatives are computed on the basis curve.
   Standard_EXPORT void D1 (const Standard_Real U, gp_Pnt& P, gp_Vec& V) const Standard_OVERRIDE;
   
 
   //! Returns the point P of parameter U, the first and second
   //! derivatives V1 and V2.
   //!
   //! Warning : On the specific case of BSplineCurve:
   //! if the curve is cut in interval of continuity at least C2, the
   //! derivatives are computed on the current interval.
   //! else the derivatives are computed on the basis curve.
   Standard_EXPORT void D2 (const Standard_Real U, gp_Pnt& P, gp_Vec& V1, gp_Vec& V2) const Standard_OVERRIDE;
   
 
   //! Returns the point P of parameter U, the first, the second
   //! and the third derivative.
   //!
   //! Warning : On the specific case of BSplineCurve:
   //! if the curve is cut in interval of continuity at least C3, the
   //! derivatives are computed on the current interval.
   //! else the derivatives are computed on the basis curve.
   Standard_EXPORT void D3 (const Standard_Real U, gp_Pnt& P, gp_Vec& V1, gp_Vec& V2, gp_Vec& V3) const Standard_OVERRIDE;
   
 
   //! The returned vector gives the value of the derivative for the
   //! order of derivation N.
   //! Warning : On the specific case of BSplineCurve:
   //! if the curve is cut in interval of continuity CN, the
   //! derivatives are computed on the current interval.
   //! else the derivatives are computed on the basis curve.
   //! Raised if N < 1.
   Standard_EXPORT gp_Vec DN (const Standard_Real U, const Standard_Integer N) const Standard_OVERRIDE;
   
   //! returns the parametric resolution
   Standard_EXPORT Standard_Real Resolution (const Standard_Real R3d) const Standard_OVERRIDE;
 
   virtual GeomAbs_CurveType GetType() const Standard_OVERRIDE { return myTypeCurve; }
 
   Standard_EXPORT gp_Lin Line() const Standard_OVERRIDE;
   
   Standard_EXPORT gp_Circ Circle() const Standard_OVERRIDE;
   
   Standard_EXPORT gp_Elips Ellipse() const Standard_OVERRIDE;
   
   Standard_EXPORT gp_Hypr Hyperbola() const Standard_OVERRIDE;
   
   Standard_EXPORT gp_Parab Parabola() const Standard_OVERRIDE;
   
 
   //! this should NEVER make a copy
   //! of the underlying curve to read
   //! the relevant information
   Standard_EXPORT Standard_Integer Degree() const Standard_OVERRIDE;
   
 
   //! this should NEVER make a copy
   //! of the underlying curve to read
   //! the relevant information
   Standard_EXPORT Standard_Boolean IsRational() const Standard_OVERRIDE;
   
 
   //! this should NEVER make a copy
   //! of the underlying curve to read
   //! the relevant information
   Standard_EXPORT Standard_Integer NbPoles() const Standard_OVERRIDE;
   
 
   //! this should NEVER make a copy
   //! of the underlying curve to read
   //! the relevant information
   Standard_EXPORT Standard_Integer NbKnots() const Standard_OVERRIDE;
   
   //! this will NOT make a copy of the
   //! Bezier Curve : If you want to modify
   //! the Curve please make a copy yourself
   //! Also it will NOT trim the surface to
   //! myFirst/Last.
   Standard_EXPORT Handle(Geom_BezierCurve) Bezier() const Standard_OVERRIDE;
   
   //! this will NOT make a copy of the
   //! BSpline Curve : If you want to modify
   //! the Curve please make a copy yourself
   //! Also it will NOT trim the surface to
   //! myFirst/Last.
   Standard_EXPORT Handle(Geom_BSplineCurve) BSpline() const Standard_OVERRIDE;
 
   Standard_EXPORT Handle(Geom_OffsetCurve) OffsetCurve() const Standard_OVERRIDE;
 
 friend class GeomAdaptor_Surface;
 
 private:
 
   Standard_EXPORT GeomAbs_Shape LocalContinuity (const Standard_Real U1, const Standard_Real U2) const;
   
   Standard_EXPORT void load (const Handle(Geom_Curve)& C, const Standard_Real UFirst, const Standard_Real ULast);
   
   //! Check theU relates to start or finish point of B-spline curve and return indices of span the point is located
   Standard_Boolean IsBoundary(const Standard_Real theU, Standard_Integer& theSpanStart, Standard_Integer& theSpanFinish) const;
 
   //! Rebuilds B-spline cache
   //! \param theParameter the value on the knot axis which identifies the caching span
   void RebuildCache (const Standard_Real theParameter) const;
 
 private:
 
   Handle(Geom_Curve) myCurve;
   GeomAbs_CurveType myTypeCurve;
   Standard_Real myFirst;
   Standard_Real myLast;
   
   Handle(Geom_BSplineCurve) myBSplineCurve; ///< B-spline representation to prevent castings
   mutable Handle(BSplCLib_Cache) myCurveCache; ///< Cached data for B-spline or Bezier curve
   Handle(GeomEvaluator_Curve) myNestedEvaluator; ///< Calculates value of offset curve
 
 };
 
 #endif // _GeomAdaptor_Curve_HeaderFile

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