QwtSeriesData< T > Class Template Reference

Abstract interface for iterating over samples. More...

#include <qwt_series_data.h>

Inheritance diagram for QwtSeriesData< T >:

Public Member Functions
	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 Attributes
QRectF	cachedBoundingRect
	Can be used to cache a calculated bounding rectangle.

Detailed Description

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.

Member Function Documentation

boundingRect()

template<typename T >

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

pure virtual

Calculate the bounding rect of all samples.

Implemented in QwtSyntheticPointData, QwtPointSeriesData, QwtPoint3DSeriesData, QwtIntervalSeriesData, QwtSetSeriesData, QwtVectorFieldData, QwtTradingChartData, QwtBoxChartData, and QwtBoxOutlierChartData.

sample()

template<typename T >

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

pure virtual

Return a sample.

Implemented in 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 >, and QwtArraySeriesData< QwtVectorFieldSample >.

setRectOfInterest()

template<typename T >

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

virtual

Set a the "rect of interest".

Reimplemented in QwtSyntheticPointData.

size()

template<typename T >

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

pure virtual

Returns

Number of samples

Implemented in 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 >, and QwtArraySeriesData< QwtVectorFieldSample >.

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The documentation for this class was generated from the following file:

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