Base class for spline interpolation 更多...

#include <qwt_spline.h>

类 QwtSplineInterpolating 继承关系图:

Public 成员函数
	QwtSplineInterpolating ()
	Constructor

	~QwtSplineInterpolating () override
	Destructor

virtual QPolygonF	equidistantPolygon (const QPolygonF &, double distance, bool withNodes) const
	Find an interpolated polygon with "equidistant" points

virtual QPolygonF	polygon (const QPolygonF &, double tolerance) const override
	Interpolate a curve by a polygon

virtual QPainterPath	painterPath (const QPolygonF &) const override
	Interpolate a curve with Bezier curves

virtual QVector< QLineF >	bezierControlLines (const QPolygonF &) const =0
	Interpolate a curve with Bezier curves

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 uint	locality () const
	Get locality (number of points used for calculation)

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

Base class for spline interpolation

Spline interpolation is the process of interpolating a set of points piecewise with polynomials. The initial set of points is preserved.

成员函数说明

◆ bezierControlLines()

QVector< QLineF > QwtSplineInterpolating::bezierControlLines ( const QPolygonF & points ) const

pure virtual

Interpolate a curve with Bezier curves

Interpolates a polygon piecewise with cubic Bezier curves and returns the 2 control points of each curve as QLineF.

参数

points Control points

返回: Control points of the interpolating Bezier curves

在 QwtSplineC1, QwtSplineC2, QwtSplineLocal, QwtSplinePleasing , 以及 QwtSplineCubic 内被实现.

◆ equidistantPolygon()

QPolygonF QwtSplineInterpolating::equidistantPolygon	(	const QPolygonF &	points,
		double	distance,
		bool	withNodes
	)		const

virtual

Find an interpolated polygon with "equidistant" points

When withNodes is disabled, all points of the resulting polygon will be equidistant according to the parametrization.

When withNodes is enabled, the resulting polygon will also include the control points and the interpolated points are always aligned to the control point before ( points[i] + i * distance ).

The implementation calculates bezier curves first and calculates the interpolated points in a second run.

参数

[in]	points	Control nodes of the spline
[in]	distance	Distance between 2 points according to the parametrization
[in]	withNodes	When true, also add the control nodes (even if not being equidistant)

返回: Interpolating polygon

参见: bezierControlLines()

被 QwtSplineC1 , 以及 QwtSplineC2 重载.

◆ painterPath()

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

overridevirtual

Interpolate a curve with Bezier curves

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

The implementation calculates the Bezier control lines first and converts them into painter path elements in an additional loop.

参数

[in] points Control points

返回: Painter path that can be rendered by QPainter

注解: Derived spline classes might overload painterPath() to avoid the extra loops for converting results into a QPainterPath

参见: bezierControlLines()

实现了 QwtSpline.

被 QwtSplineC1, QwtSplineC2, QwtSplineCubic, QwtSplineLocal , 以及 QwtSplinePleasing 重载.

◆ polygon()

QPolygonF QwtSplineInterpolating::polygon	(	const QPolygonF &	points,
		double	tolerance
	)		const

overridevirtual

Interpolate a curve by a polygon

Interpolates a polygon piecewise with Bezier curves approximating them by polygons.

The approximation is based on "Piecewise Linear Approximation of Bezier Curves" by Roger Willcocks ( http://www.rops.org )

参数

[in]	points	Control points
[in]	tolerance	Maximum for the accepted error of the approximation

返回: Polygon approximating the interpolating polynomials

参见: bezierControlLines(), QwtSplineBezier::toPolygon()

重载 QwtSpline .

该类的文档由以下文件生成:

/home/runner/work/QWT/QWT/src/plot/qwt_spline.h
/home/runner/work/QWT/QWT/src/plot/qwt_spline.cpp

Public 成员函数

额外继承的成员函数

详细描述

成员函数说明

◆ bezierControlLines()

◆ equidistantPolygon()

◆ painterPath()

◆ polygon()