An approximation using a basis spline 更多...

类 QwtSplineBasis 继承关系图:

Public 成员函数
	QwtSplineBasis ()
	Constructor

	~QwtSplineBasis () override
	Destructor

virtual QPainterPath	painterPath (const QPolygonF &) const override
	Get painter path from polygon

virtual uint	locality () const override
	Get locality (always 2)

Public 成员函数继承自 QwtSpline
	QwtSpline ()
	Constructor

virtual	~QwtSpline ()
	Destructor

void	setParametrization (int type)
	Set parametrization by type

void	setParametrization (QwtSplineParametrization *)
	Set parametrization object

const QwtSplineParametrization *	parametrization () const
	Get parametrization

void	setBoundaryType (BoundaryType)
	Set boundary type

BoundaryType	boundaryType () const
	Get boundary type

void	setBoundaryValue (BoundaryPosition, double value)
	Set boundary value

double	boundaryValue (BoundaryPosition) const
	Get boundary value

void	setBoundaryCondition (BoundaryPosition, int condition)
	Set boundary condition

int	boundaryCondition (BoundaryPosition) const
	Get boundary condition

void	setBoundaryConditions (int condition, double valueBegin=0.0, double valueEnd=0.0)
	Set boundary conditions for both ends

virtual QPolygonF	polygon (const QPolygonF &, double tolerance) const
	Get polygon approximation with tolerance

额外继承的成员函数
Public 类型继承自 QwtSpline
enum	BoundaryType { ConditionalBoundaries , PeriodicPolygon , ClosedPolygon }
	Boundary type specifying the spline at its endpoints 更多...

enum	BoundaryPosition { AtBeginning , AtEnd }
	position of a boundary condition 更多...

enum	BoundaryCondition { Clamped1 , Clamped2 , Clamped3 , LinearRunout }
	Boundary condition 更多...

详细描述

An approximation using a basis spline

QwtSplineBasis approximates a set of points by a polynomials with C2 continuity ( = first and second derivatives are equal ) at the end points.

The end points of the spline do not match the original points.

成员函数说明

uint QwtSplineBasis::locality ( ) const

overridevirtual

Get locality (always 2)

Get locality

The locality is always 2, meaning changing one control point affects 2 polynomials before and 2 polynomials after.

QPainterPath QwtSplineBasis::painterPath ( const QPolygonF & points ) const

overridevirtual

Get painter path from polygon

Approximate a polygon with cubic Bezier curves

Approximates a polygon piecewise with cubic Bezier curves and returns them as QPainterPath.

参数

[in] points Control points

实现了 QwtSpline.

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