BSplCLib_CacheParams Struct Reference

Simple structure containing parameters describing parameterization of a B-spline curve or a surface in one direction (U or V), and data of the current span for its caching. More...

#include <BSplCLib_CacheParams.hxx>

Public Member Functions
	BSplCLib_CacheParams (Standard_Integer theDegree, Standard_Boolean thePeriodic, const TColStd_Array1OfReal &theFlatKnots)
	Constructor, prepares data structures for caching.
Standard_Real	PeriodicNormalization (Standard_Real theParameter) const
	Normalizes the parameter for periodic B-splines.
Standard_Boolean	IsCacheValid (Standard_Real theParameter) const
	Verifies validity of the cache using flat parameter of the point.
void	LocateParameter (Standard_Real &theParameter, const TColStd_Array1OfReal &theFlatKnots)
	Computes span for the specified parameter.

Data Fields
const Standard_Integer	Degree
	degree of Bezier/B-spline
const Standard_Boolean	IsPeriodic
	true of the B-spline is periodic
const Standard_Real	FirstParameter
	first valid parameter
const Standard_Real	LastParameter
	last valid parameter
const Standard_Integer	SpanIndexMin
	minimal index of span
const Standard_Integer	SpanIndexMax
	maximal index of span
Standard_Real	SpanStart
	parameter for the frst point of the span
Standard_Real	SpanLength
	length of the span
Standard_Integer	SpanIndex
	index of the span

Detailed Description

Simple structure containing parameters describing parameterization of a B-spline curve or a surface in one direction (U or V), and data of the current span for its caching.

Constructor & Destructor Documentation

BSplCLib_CacheParams()

BSplCLib_CacheParams::BSplCLib_CacheParams ( Standard_Integer theDegree, Standard_Boolean thePeriodic, const TColStd_Array1OfReal & theFlatKnots )

inline

Constructor, prepares data structures for caching.

Parameters

theDegree	degree of the B-spline (or Bezier)
thePeriodic	identify whether the B-spline is periodic
theFlatKnots	knots of Bezier / B-spline parameterization

Member Function Documentation

IsCacheValid()

Standard_Boolean BSplCLib_CacheParams::IsCacheValid ( Standard_Real theParameter ) const

inline

Verifies validity of the cache using flat parameter of the point.

Parameters

theParameter

parameter of the point placed in the span

LocateParameter()

void BSplCLib_CacheParams::LocateParameter ( Standard_Real & theParameter, const TColStd_Array1OfReal & theFlatKnots )

inline

Computes span for the specified parameter.

Parameters

theParameter	parameter of the point placed in the span
theFlatKnots	knots of Bezier / B-spline parameterization

PeriodicNormalization()

Standard_Real BSplCLib_CacheParams::PeriodicNormalization ( Standard_Real theParameter ) const

inline

Normalizes the parameter for periodic B-splines.

Parameters

theParameter

the value to be normalized into the knots array

Field Documentation

Degree

const Standard_Integer BSplCLib_CacheParams::Degree

degree of Bezier/B-spline

FirstParameter

const Standard_Real BSplCLib_CacheParams::FirstParameter

first valid parameter

IsPeriodic

const Standard_Boolean BSplCLib_CacheParams::IsPeriodic

true of the B-spline is periodic

LastParameter

const Standard_Real BSplCLib_CacheParams::LastParameter

last valid parameter

SpanIndex

Standard_Integer BSplCLib_CacheParams::SpanIndex

index of the span

SpanIndexMax

const Standard_Integer BSplCLib_CacheParams::SpanIndexMax

maximal index of span

SpanIndexMin

const Standard_Integer BSplCLib_CacheParams::SpanIndexMin

minimal index of span

SpanLength

Standard_Real BSplCLib_CacheParams::SpanLength

length of the span

SpanStart

Standard_Real BSplCLib_CacheParams::SpanStart

parameter for the frst point of the span

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The documentation for this struct was generated from the following file:

• BSplCLib_CacheParams.hxx