#include <TColgp_Array1OfPnt.hxx>
#include <TColgp_Array1OfPnt2d.hxx>
-//! \brief A cache class for B-spline curves.
+//! \brief A cache class for Bezier and B-spline curves.
//!
-//! Defines all data, that can be cached on a span of B-spline curve.
+//! Defines all data, that can be cached on a span of a curve.
//! The data should be recalculated in going from span to span.
class BSplCLib_Cache : public Standard_Transient
{
//! 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 theDegree degree of the curve
+ //! \param thePeriodic identify the curve is periodic
+ //! \param theFlatKnots knots of Bezier/B-spline curve (with repetitions)
+ //! \param thePoles2d array of poles of 2D curve
//! \param theWeights array of weights of corresponding poles
Standard_EXPORT BSplCLib_Cache(const Standard_Integer& theDegree,
const Standard_Boolean& thePeriodic,
const TColgp_Array1OfPnt2d& thePoles2d,
const TColStd_Array1OfReal* theWeights = NULL);
//! 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 theDegree degree of the curve
+ //! \param thePeriodic identify the curve is periodic
+ //! \param theFlatKnots knots of Bezier/B-spline curve (with repetitions)
+ //! \param thePoles array of poles of 3D curve
//! \param theWeights array of weights of corresponding poles
Standard_EXPORT BSplCLib_Cache(const Standard_Integer& theDegree,
const Standard_Boolean& thePeriodic,
//! 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 theDegree degree of the curve
+ //! \param thePeriodic identify the curve is periodic
+ //! \param theFlatKnots knots of Bezier/B-spline curve (with repetitions)
+ //! \param thePoles2d array of poles of 2D curve
//! \param theWeights array of weights of corresponding poles
Standard_EXPORT void BuildCache(const Standard_Real& theParameter,
const Standard_Integer& theDegree,
const TColStd_Array1OfReal* theWeights = NULL);
//! 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 theDegree degree of the curve
+ //! \param thePeriodic identify the curve is periodic
+ //! \param theFlatKnots knots of Bezier/B-spline curve (with repetitions)
+ //! \param thePoles array of poles of 3D curve
//! \param theWeights array of weights of corresponding poles
Standard_EXPORT void BuildCache(const Standard_Real& theParameter,
const Standard_Integer& theDegree,
const TColgp_Array1OfPnt& thePoles,
const TColStd_Array1OfReal* theWeights = NULL);
- //! Calculates the point on B-spline in the selected point
+ //! Calculates the point on the curve in the specified parameter
//! \param[in] theParameter parameter of calculation of the value
- //! \param[out] thePoint the result of calculation (the point on B-spline)
+ //! \param[out] thePoint the result of calculation (the point on the curve)
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
+ //! Calculates the point on the curve and its first derivative in the specified parameter
//! \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
+ //! \param[out] thePoint the result of calculation (the point on the curve)
+ //! \param[out] theTangent tangent vector (first derivatives) for the curve 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
+ //! Calculates the point on the curve and two derivatives in the specified parameter
//! \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] thePoint the result of calculation (the point on the curve)
+ //! \param[out] theTangent tangent vector (1st derivatives) for the curve in the calculated point
+ //! \param[out] theCurvature curvature vector (2nd derivatives) for the curve in the calculated point
Standard_EXPORT void D2(const Standard_Real& theParameter,
gp_Pnt2d& thePoint,
gp_Vec2d& theTangent,
gp_Vec& theTangent,
gp_Vec& theCurvature) const;
- //! Calculates the point on B-spline and three derivatives in the selected point
+ //! Calculates the point on the curve and three derivatives in the specified parameter
//! \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
+ //! \param[out] thePoint the result of calculation (the point on the curve)
+ //! \param[out] theTangent tangent vector (1st derivatives) for the curve in the calculated point
+ //! \param[out] theCurvature curvature vector (2nd derivatives) for the curve in the calculated point
+ //! \param[out] theTorsion second curvature vector (3rd derivatives) for the curve in the calculated point
Standard_EXPORT void D3(const Standard_Real& theParameter,
gp_Pnt2d& thePoint,
gp_Vec2d& theTangent,
DEFINE_STANDARD_RTTI(BSplCLib_Cache, Standard_Transient)
protected:
- //! Normalizes the parameter for periodical B-splines
+ //! Normalizes the parameter for periodical curves
//! \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
+ //! Fills array of derivatives in the selected point of the curve
//! \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)
+ //! where PntDim = 2 or 3 is a dimension of the curve)
void CalculateDerivative(const Standard_Real& theParameter,
const Standard_Integer& theDerivative,
Standard_Real& theDerivArray) const;
// 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_Boolean myIsRational; ///< identifies the rationality of Bezier/B-spline curve
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)
+ Standard_Integer mySpanIndex; ///< index of the span on Bezier/B-spline curve
+ Standard_Integer mySpanIndexMax; ///< maximal number of spans on Bezier/B-spline curve
+ Standard_Integer myDegree; ///< degree of Bezier/B-spline
+ Handle(TColStd_HArray1OfReal) myFlatKnots; ///< knots of Bezier/B-spline (used for periodic normalization of parameters, exists only for periodical splines)
};
DEFINE_STANDARD_HANDLE(BSplCLib_Cache, Standard_Transient)
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