QwtSplinePleasing类 参考

A spline with G1 continuity 更多...

#include <qwt_spline_pleasing.h>

类 QwtSplinePleasing 继承关系图:

Public 成员函数
	QwtSplinePleasing ()
	Constructor
	~QwtSplinePleasing () override
	Destructor
virtual uint	locality () const override
	Get locality
virtual QPainterPath	painterPath (const QPolygonF &) const override
	Interpolate a curve with Bezier curves
virtual QVector< QLineF >	bezierControlLines (const QPolygonF &) const override
	Interpolate a curve with Bezier curves
Public 成员函数 继承自 QwtSplineG1
	QwtSplineG1 ()
	Constructor
	~QwtSplineG1 () override
	Destructor
Public 成员函数 继承自 QwtSplineInterpolating
	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
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

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

A spline with G1 continuity

QwtSplinePleasing is some sort of cardinal spline, with non C1 continuous extra rules for narrow angles. It has a locality of 2.

注解

The algorithm is the one offered by a popular office package.

构造及析构函数说明

QwtSplinePleasing()

QwtSplinePleasing::QwtSplinePleasing

(

)

Constructor

The default setting is a non closing spline with uniform parametrization. ( QwtSplineParametrization::ParameterUniform ).

参见

QwtSpline::setParametrization(), QwtSpline::setBoundaryType()

成员函数说明

bezierControlLines()

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

overridevirtual

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

实现了 QwtSplineInterpolating.

locality()

uint QwtSplinePleasing::locality ( ) const

overridevirtual

Get locality

返回

2 (looks 2 points ahead/behind)

重载 QwtSpline .

painterPath()

QPainterPath QwtSplinePleasing::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.

参数

points

Control points

返回

QPainterPath Painter path, that can be rendered by QPainter

重载 QwtSplineInterpolating .

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该类的文档由以下文件生成:

• /home/runner/work/QWT/QWT/src/plot/qwt_spline_pleasing.h
• /home/runner/work/QWT/QWT/src/plot/qwt_spline_pleasing.cpp