--- /dev/null
+// Copyright (c) 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 _BSplCLib_Cache_Headerfile
+#define _BSplCLib_Cache_Headerfile
+
+#include <Standard.hxx>
+#include <Standard_Macro.hxx>
+#include <Standard_DefineHandle.hxx>
+#include <Standard_Transient.hxx>
+
+#include <Handle_TColStd_HArray1OfReal.hxx>
+#include <Handle_TColStd_HArray2OfReal.hxx>
+
+#include <gp_Pnt2d.hxx>
+#include <gp_Pnt.hxx>
+#include <gp_Vec2d.hxx>
+#include <gp_Vec.hxx>
+
+class Handle(BSplCLib_Cache);
+class TColStd_Array1OfReal;
+class TColgp_Array1OfPnt;
+class TColgp_Array1OfPnt2d;
+
+#ifndef NOWEIGHTS_CURVE
+#define NOWEIGHTS_CURVE (*((TColStd_Array1OfReal*) NULL))
+#endif
+
+//! \brief A cache class for B-spline curves.
+//!
+//! Defines all data, that can be cached on a span of B-spline curve.
+//! The data should be recalculated in going from span to span.
+class BSplCLib_Cache : public Standard_Transient
+{
+public:
+ //! Default constructor
+ Standard_EXPORT BSplCLib_Cache();
+ //! Constructor for caching of 2D curves
+ //! \param theDegree degree of the B-spline
+ //! \param thePeriodic identify the B-spline is periodic
+ //! \param theFlatKnots knots of B-spline curve (with repetitions)
+ //! \param thePoles2d array of poles of 2D B-spline
+ //! \param theWeights array of weights of corresponding poles
+ Standard_EXPORT BSplCLib_Cache(const Standard_Integer& theDegree,
+ const Standard_Boolean& thePeriodic,
+ const TColStd_Array1OfReal& theFlatKnots,
+ const TColgp_Array1OfPnt2d& thePoles2d,
+ const TColStd_Array1OfReal& theWeights = NOWEIGHTS_CURVE);
+ //! Constructor for caching of 3D curves
+ //! \param theDegree degree of the B-spline
+ //! \param thePeriodic identify the B-spline is periodic
+ //! \param theFlatKnots knots of B-spline curve (with repetitions)
+ //! \param thePoles array of poles of 3D B-spline
+ //! \param theWeights array of weights of corresponding poles
+ Standard_EXPORT BSplCLib_Cache(const Standard_Integer& theDegree,
+ const Standard_Boolean& thePeriodic,
+ const TColStd_Array1OfReal& theFlatKnots,
+ const TColgp_Array1OfPnt& thePoles,
+ const TColStd_Array1OfReal& theWeights = NOWEIGHTS_CURVE);
+
+ //! Verifies validity of the cache using flat parameter of the point
+ //! \param theParameter parameter of the point placed in the span
+ Standard_EXPORT Standard_Boolean IsCacheValid(Standard_Real theParameter) const;
+
+ //! Recomputes the cache data for 2D curves. Does not verify validity of the cache
+ //! \param theParameter the value on the knot's axis to identify the span
+ //! \param theDegree degree of the B-spline
+ //! \param thePeriodic identify the B-spline is periodic
+ //! \param theFlatKnots knots of B-spline curve (with repetitions)
+ //! \param thePoles2d array of poles of 2D B-spline
+ //! \param theWeights array of weights of corresponding poles
+ Standard_EXPORT void BuildCache(const Standard_Real& theParameter,
+ const Standard_Integer& theDegree,
+ const Standard_Boolean& thePeriodic,
+ const TColStd_Array1OfReal& theFlatKnots,
+ const TColgp_Array1OfPnt2d& thePoles2d,
+ const TColStd_Array1OfReal& theWeights = NOWEIGHTS_CURVE);
+ //! Recomputes the cache data for 3D curves. Does not verify validity of the cache
+ //! \param theParameter the value on the knot's axis to identify the span
+ //! \param theDegree degree of the B-spline
+ //! \param thePeriodic identify the B-spline is periodic
+ //! \param theFlatKnots knots of B-spline curve (with repetitions)
+ //! \param thePoles array of poles of 3D B-spline
+ //! \param theWeights array of weights of corresponding poles
+ Standard_EXPORT void BuildCache(const Standard_Real& theParameter,
+ const Standard_Integer& theDegree,
+ const Standard_Boolean& thePeriodic,
+ const TColStd_Array1OfReal& theFlatKnots,
+ const TColgp_Array1OfPnt& thePoles,
+ const TColStd_Array1OfReal& theWeights = NOWEIGHTS_CURVE);
+
+ //! Calculates the point on B-spline in the selected point
+ //! \param[in] theParameter parameter of calculation of the value
+ //! \param[out] thePoint the result of calculation (the point on B-spline)
+ Standard_EXPORT void D0(const Standard_Real& theParameter, gp_Pnt2d& thePoint) const;
+ Standard_EXPORT void D0(const Standard_Real& theParameter, gp_Pnt& thePoint) const;
+
+ //! Calculates the point on B-spline and its first derivative in the selected point
+ //! \param[in] theParameter parameter of calculation of the value
+ //! \param[out] thePoint the result of calculation (the point on B-spline)
+ //! \param[out] theTangent tangent vector (first derivatives) for B-spline in the calculated point
+ Standard_EXPORT void D1(const Standard_Real& theParameter, gp_Pnt2d& thePoint, gp_Vec2d& theTangent) const;
+ Standard_EXPORT void D1(const Standard_Real& theParameter, gp_Pnt& thePoint, gp_Vec& theTangent) const;
+
+ //! Calculates the point on B-spline and two derivatives in the selected point
+ //! \param[in] theParameter parameter of calculation of the value
+ //! \param[out] thePoint the result of calculation (the point on B-spline)
+ //! \param[out] theTangent tangent vector (1st derivatives) for B-spline in the calculated point
+ //! \param[out] theCurvature curvature vector (2nd derivatives) for B-spline in the calculated point
+ Standard_EXPORT void D2(const Standard_Real& theParameter,
+ gp_Pnt2d& thePoint,
+ gp_Vec2d& theTangent,
+ gp_Vec2d& theCurvature) const;
+ Standard_EXPORT void D2(const Standard_Real& theParameter,
+ gp_Pnt& thePoint,
+ gp_Vec& theTangent,
+ gp_Vec& theCurvature) const;
+
+ //! Calculates the point on B-spline and three derivatives in the selected point
+ //! \param[in] theParameter parameter of calculation of the value
+ //! \param[out] thePoint the result of calculation (the point on B-spline)
+ //! \param[out] theTangent tangent vector (1st derivatives) for B-spline in the calculated point
+ //! \param[out] theCurvature curvature vector (2nd derivatives) for B-spline in the calculated point
+ //! \param[out] theTorsion second curvature vector (3rd derivatives) for B-spline in the calculated point
+ Standard_EXPORT void D3(const Standard_Real& theParameter,
+ gp_Pnt2d& thePoint,
+ gp_Vec2d& theTangent,
+ gp_Vec2d& theCurvature,
+ gp_Vec2d& theTorsion) const;
+ Standard_EXPORT void D3(const Standard_Real& theParameter,
+ gp_Pnt& thePoint,
+ gp_Vec& theTangent,
+ gp_Vec& theCurvature,
+ gp_Vec& theTorsion) const;
+
+
+ DEFINE_STANDARD_RTTI(BSplCLib_Cache)
+
+protected:
+ //! Normalizes the parameter for periodical B-splines
+ //! \param theFlatKnots knots with repetitions
+ //! \param theParameter the value to be normalized into the knots array
+ void PeriodicNormalization(const TColStd_Array1OfReal& theFlatKnots, Standard_Real& theParameter) const;
+
+ //! Fills array of derivatives in the selected point of the B-spline
+ //! \param[in] theParameter parameter of the calculation
+ //! \param[in] theDerivative maximal derivative to be calculated (computes all derivatives lesser than specified)
+ //! \param[out] theDerivArray result array of derivatives (with size (theDerivative+1)*(PntDim+1),
+ //! where PntDim = 2 or 3 is a dimension of B-spline curve)
+ void CalculateDerivative(const Standard_Real& theParameter,
+ const Standard_Integer& theDerivative,
+ Standard_Real& theDerivArray) const;
+
+private:
+ Handle(TColStd_HArray2OfReal) myPolesWeights; ///< array of poles and weights of calculated cache
+ // the array has following structure:
+ // x1 y1 [z1] [w1]
+ // x2 y2 [z2] [w2] etc
+ // for 2D-curves there is no z conponent, for non-rational curves there is no weight
+
+ Standard_Boolean myIsRational; ///< identifies the rationality of B-spline
+ Standard_Real mySpanStart; ///< parameter for the first point of the span
+ Standard_Real mySpanLength; ///< length of the span
+ Standard_Integer mySpanIndex; ///< index of the span on B-spline curve
+ Standard_Integer mySpanIndexMax; ///< maximal number of spans on B-spline curve
+ Standard_Integer myDegree; ///< degree of B-spline
+ Handle(TColStd_HArray1OfReal) myFlatKnots; ///< knots of B-spline (used for periodic normalization of parameters, exists only for periodical splines)
+};
+
+DEFINE_STANDARD_HANDLE(BSplCLib_Cache, Standard_Transient)
+
+#endif