QwtSpline类 参考

所有样条曲线的基类 更多...

#include <qwt_spline.h>

类 QwtSpline 继承关系图:

类
class	PrivateData

Public 类型
enum	BoundaryType { ConditionalBoundaries , PeriodicPolygon , ClosedPolygon }
	指定样条端点处的边界类型 更多...
enum	BoundaryPosition { AtBeginning , AtEnd }
	边界条件的位置 更多...
enum	BoundaryCondition { Clamped1 , Clamped2 , Clamped3 , LinearRunout }
	边界条件 更多...

Public 成员函数
	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
virtual QPainterPath	painterPath (const QPolygonF &) const =0
	Get painter path from polygon (pure virtual)
virtual uint	locality () const
	Get locality (number of points used for calculation)

详细描述

所有样条曲线的基类

成员枚举类型说明

BoundaryCondition

enum QwtSpline::BoundaryCondition

边界条件

枚举值
Clamped1	给定终点处的一阶导数 参见 boundaryValue()
Clamped2	给定终点处的二阶导数 参见 boundaryValue() 注解 二阶导数为 0 的条件也称为"自然"条件。
Clamped3	给定终点处的三阶导数 参见 boundaryValue() 注解 三阶导数为 0 的条件也称为"抛物线延伸"。
LinearRunout	终点处的一阶导数与其相邻点的一阶导数通过边界值相关联。 例如，当终点的边界值为 1.0 时，最后两个点的斜率相同。 参见 boundaryValue().

BoundaryPosition

enum QwtSpline::BoundaryPosition

边界条件的位置

枚举值
AtBeginning	条件在多项式的起始处
AtEnd	条件在多项式的结束处

BoundaryType

enum QwtSpline::BoundaryType

指定样条端点处的边界类型

枚举值
ConditionalBoundaries	起点/终点处的多项式取决于特定条件 参见 QwtSpline::BoundaryCondition
PeriodicPolygon	起点/终点处的多项式通过使用虚拟附加点来确定。 终点的附加点通过平移起始点的点或反之来找到。
ClosedPolygon	ClosedPolygon 与 PeriodicPolygon 类似，但插值包含 最后一个和第一个控制点之间的连接。 注解 仅适用于参数增量为正的参数化， 即最终闭合线的参数增量为正。 这不包括 QwtSplineParametrization::ParameterX 和 QwtSplineParametrization::ParameterY

构造及析构函数说明

QwtSpline()

QwtSpline::QwtSpline

(

)

Constructor

构造函数

~QwtSpline()

QwtSpline::~QwtSpline ( )

virtual

Destructor

析构函数

成员函数说明

boundaryCondition()

int QwtSpline::boundaryCondition

(

BoundaryPosition

position

)

const

Get boundary condition

获取边界条件

boundaryType()

QwtSpline::BoundaryType QwtSpline::boundaryType

(

)

const

Get boundary type

获取边界类型

boundaryValue()

double QwtSpline::boundaryValue

(

BoundaryPosition

position

)

const

Get boundary value

获取边界值

locality()

uint QwtSpline::locality ( ) const

virtual

Get locality (number of points used for calculation)

获取样条插值的局部性

被 QwtSplineBasis, QwtSplineCubic, QwtSplineLocal , 以及 QwtSplinePleasing 重载.

painterPath()

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

pure virtual

Get painter path from polygon (pure virtual)

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

参数

points

Control points

返回

Painter path, that can be rendered by QPainter

参见

polygon(), QwtBezier

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

parametrization()

const QwtSplineParametrization * QwtSpline::parametrization

(

)

const

Get parametrization

获取参数化

polygon()

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

virtual

Get polygon approximation with tolerance

用多边形插值曲线

被 QwtSplineInterpolating 重载.

setBoundaryCondition()

void QwtSpline::setBoundaryCondition	(	BoundaryPosition	position,
		int	condition
	)

Set boundary condition

设置边界条件

setBoundaryConditions()

void QwtSpline::setBoundaryConditions	(	int	condition,
		double	valueBegin = 0.0,
		double	valueEnd = 0.0
	)

Set boundary conditions for both ends

为两端设置边界条件

setBoundaryType()

void QwtSpline::setBoundaryType

(

BoundaryType

boundaryType

)

Set boundary type

设置边界类型

setBoundaryValue()

void QwtSpline::setBoundaryValue	(	BoundaryPosition	position,
		double	value
	)

Set boundary value

设置边界值

setParametrization() [1/2]

void QwtSpline::setParametrization

(

int

type

)

Set parametrization by type

按类型设置参数化

setParametrization() [2/2]

void QwtSpline::setParametrization

(

QwtSplineParametrization *

parametrization

)

Set parametrization object

设置参数化对象

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