QwtSeriesData< T > 模板类 参考

Abstract interface for iterating over samples 更多...

#include <qwt_series_data.h>

类 QwtSeriesData< T > 继承关系图:

Public 成员函数
	QwtSeriesData ()
	Constructor
virtual	~QwtSeriesData ()
	Destructor
virtual size_t	size () const =0
virtual T	sample (size_t i) const =0
	Return a sample
virtual QRectF	boundingRect () const =0
	Calculate the bounding rect of all samples
virtual void	setRectOfInterest (const QRectF &rect)
	Set a the "rect of interest"

Protected 属性
QRectF	cachedBoundingRect
	Can be used to cache a calculated bounding rectangle

详细描述

template<typename T>
class QwtSeriesData< T >

Abstract interface for iterating over samples

Qwt offers several implementations of the QwtSeriesData API, but in situations, where data of an application specific format needs to be displayed, without having to copy it, it is recommended to implement an individual data access.

A subclass of QwtSeriesData<QPointF> must implement:

• size(): Should return number of data points.
• sample(): Should return values x and y values of the sample at specific position as QPointF object.
• boundingRect(): Should return the bounding rectangle of the data series. It is used for autoscaling and might help certain algorithms for displaying the data. You can use qwtBoundingRect() for an implementation but often it is possible to implement a more efficient algorithm depending on the characteristics of the series. The member cachedBoundingRect is intended for caching the calculated rectangle.

成员函数说明

boundingRect()

template<typename T >

virtual QRectF QwtSeriesData< T >::boundingRect ( ) const

pure virtual

Calculate the bounding rect of all samples

在 QwtSyntheticPointData, QwtPointSeriesData, QwtPoint3DSeriesData, QwtIntervalSeriesData, QwtSetSeriesData, QwtVectorFieldData, QwtTradingChartData, QwtBoxChartData , 以及 QwtBoxOutlierChartData 内被实现.

sample()

template<typename T >

virtual T QwtSeriesData< T >::sample ( size_t  i ) const

pure virtual

Return a sample

在 QwtPointArrayData< T >, QwtCPointerData< T >, QwtValuePointData< T >, QwtCPointerValueData< T >, QwtSyntheticPointData, QwtArraySeriesData< T >, QwtArraySeriesData< QPointF >, QwtArraySeriesData< QwtBoxOutlierSample >, QwtArraySeriesData< QwtBoxSample >, QwtArraySeriesData< QwtIntervalSample >, QwtArraySeriesData< QwtOHLCSample >, QwtArraySeriesData< QwtPoint3D >, QwtArraySeriesData< QwtSetSample > , 以及 QwtArraySeriesData< QwtVectorFieldSample > 内被实现.

setRectOfInterest()

template<typename T >

void QwtSeriesData< T >::setRectOfInterest ( const QRectF &  rect )

virtual

Set a the "rect of interest"

被 QwtSyntheticPointData 重载.

size()

template<typename T >

virtual size_t QwtSeriesData< T >::size ( ) const

pure virtual

返回

Number of samples

在 QwtPointArrayData< T >, QwtCPointerData< T >, QwtValuePointData< T >, QwtCPointerValueData< T >, QwtSyntheticPointData, QwtArraySeriesData< T >, QwtArraySeriesData< QPointF >, QwtArraySeriesData< QwtBoxOutlierSample >, QwtArraySeriesData< QwtBoxSample >, QwtArraySeriesData< QwtIntervalSample >, QwtArraySeriesData< QwtOHLCSample >, QwtArraySeriesData< QwtPoint3D >, QwtArraySeriesData< QwtSetSample > , 以及 QwtArraySeriesData< QwtVectorFieldSample > 内被实现.

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该类的文档由以下文件生成:

• /home/runner/work/QWT/QWT/src/core/qwt_series_data.h