QwtSplineLocal类 参考

具有 C1 连续性的样条 更多...

#include <qwt_spline_local.h>

类 QwtSplineLocal 继承关系图:

Public 类型
enum	Type { Cardinal , ParabolicBlending , Akima , PChip }
	样条插值类型 更多...
Public 类型 继承自 QwtSpline
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
	QwtSplineLocal (Type type)
	Constructor with spline type
virtual	~QwtSplineLocal ()
	Destructor
Type	type () const
	Get spline type
virtual uint	locality () const override
	Get locality (number of points used for calculation)
virtual QPainterPath	painterPath (const QPolygonF &) const override
	Get painter path from polygon
virtual QVector< QLineF >	bezierControlLines (const QPolygonF &) const override
	Get Bezier control lines
virtual QVector< QwtSplinePolynomial >	polynomials (const QPolygonF &) const override
	Get polynomials from polygon
virtual QVector< double >	slopes (const QPolygonF &) const override
	Get slopes at control points
Public 成员函数 继承自 QwtSplineC1
	QwtSplineC1 ()
	构造函数
virtual	~QwtSplineC1 ()
	析构函数
virtual QPolygonF	equidistantPolygon (const QPolygonF &, double distance, bool withNodes) const override
	查找具有"等距"点的插值多边形
virtual double	slopeAtBeginning (const QPolygonF &, double slopeNext) const
	计算样条起始处的斜率
virtual double	slopeAtEnd (const QPolygonF &, double slopeBefore) const
	计算样条结束处的斜率
Public 成员函数 继承自 QwtSplineG1
	QwtSplineG1 ()
	构造函数
virtual	~QwtSplineG1 ()
	析构函数
Public 成员函数 继承自 QwtSplineInterpolating
	QwtSplineInterpolating ()
	构造函数
virtual	~QwtSplineInterpolating ()
	析构函数
virtual QPolygonF	polygon (const QPolygonF &, double tolerance) const override
	用多边形插值曲线
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

详细描述

具有 C1 连续性的样条

成员枚举类型说明

Type

enum QwtSplineLocal::Type

样条插值类型

枚举值
Cardinal	基数样条 基数样条插值是一种非常便宜的计算，局部性为 1。
ParabolicBlending	抛物线混合是一种局部性为 1 的便宜计算。有时也称为三次贝塞尔插值。
Akima	H.Akima 算法是一种局部性为 2 的计算。
PChip	分段三次 Hermite 插值多项式 (PCHIP) 是一种因 MATLAB 提供而流行的算法。 它保持数据的形状并尊重单调性。它的局部性为 1。

构造及析构函数说明

QwtSplineLocal()

QwtSplineLocal::QwtSplineLocal ( Type  type )

explicit

Constructor with spline type

构造函数

~QwtSplineLocal()

QwtSplineLocal::~QwtSplineLocal ( )

virtual

Destructor

析构函数

成员函数说明

bezierControlLines()

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

overridevirtual

Get Bezier control lines

使用贝塞尔曲线插值曲线

重载 QwtSplineC1 .

locality()

uint QwtSplineLocal::locality ( ) const

overridevirtual

Get locality (number of points used for calculation)

获取样条插值的局部性

重载 QwtSpline .

painterPath()

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

overridevirtual

Get painter path from polygon

使用贝塞尔曲线插值曲线

重载 QwtSplineC1 .

polynomials()

QVector< QwtSplinePolynomial > QwtSplineLocal::polynomials ( const QPolygonF &  points ) const

overridevirtual

Get polynomials from polygon

计算非参数样条的插值多项式

重载 QwtSplineC1 .

slopes()

QVector< double > QwtSplineLocal::slopes ( const QPolygonF &  points ) const

overridevirtual

Get slopes at control points

在控制点处找到一阶导数

实现了 QwtSplineC1.

type()

QwtSplineLocal::Type QwtSplineLocal::type

(

)

const

Get spline type

获取样条类型

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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_local.h
• /home/runner/work/QWT/QWT/src/plot/qwt_spline_local.cpp