Utility class for reading and writing sample data from QwtPlotItem instances. More...

#include <qwt_plot_data_access.h>

Static Public Member Functions
static QVector< QPointF >	xySamples (const QwtPlotItem *item)
	Extract XY samples from a plot item.

static void	xySamples (const QwtPlotItem *item, QVector< double > &x, QVector< double > &y)
	Extract XY samples into separate x and y vectors.

static bool	setXYSamples (QwtPlotItem *item, const QVector< QPointF > &data)
	Set XY samples on a plot item.

static bool	setXYSamples (QwtPlotItem *item, const QVector< double > &x, const QVector< double > &y)
	Set XY samples from separate x and y vectors.

static QVector< QwtIntervalSample >	intervalSamples (const QwtPlotItem *item)
	Extract interval samples from a plot item.

static bool	setIntervalSamples (QwtPlotItem *item, const QVector< QwtIntervalSample > &data)
	Set interval samples on a plot item.

static QVector< QwtPoint3D >	xyzSamples (const QwtPlotItem *item)
	Extract 3D point samples from a plot item.

static bool	setXyzSamples (QwtPlotItem *item, const QVector< QwtPoint3D > &data)
	Set 3D point samples on a plot item.

static QVector< QwtOHLCSample >	ohlcSamples (const QwtPlotItem *item)
	Extract OHLC samples from a plot item.

static bool	setOhlcSamples (QwtPlotItem *item, const QVector< QwtOHLCSample > &data)
	Set OHLC samples on a plot item.

static QVector< QwtSetSample >	setSamples (const QwtPlotItem *item)
	Extract set samples from a plot item.

static bool	setSetSamples (QwtPlotItem *item, const QVector< QwtSetSample > &data)
	Set set samples on a plot item.

static QVector< QwtVectorFieldSample >	vectorFieldSamples (const QwtPlotItem *item)
	Extract vector field samples from a plot item.

static bool	setVectorFieldSamples (QwtPlotItem *item, const QVector< QwtVectorFieldSample > &data)
	Set vector field samples on a plot item.

static QVector< QwtBoxSample >	boxSamples (const QwtPlotItem *item)
	Extract box samples from a plot item.

static bool	setBoxSamples (QwtPlotItem *item, const QVector< QwtBoxSample > &data)
	Set box samples on a plot item.

template<typename T >
static QVector< T >	samples (const QwtSeriesStore< T > *store)

template<typename T >
static QVector< T >	samples (const QwtSeriesStore< T > *store, int from, int to)

static QVector< QPointF >	xySamplesInRange (const QwtPlotItem *item, const QRectF &range)
	Extract XY samples within a rectangular range.

static QVector< QPointF >	xySamplesInRange (const QwtPlotItem *item, const QPainterPath &range)
	Extract XY samples within a path range.

static int	removeSamplesInRange (QwtPlotItem *item, const QRectF &range)
	Remove XY samples within a rectangular range.

static int	removeSamplesInRange (QwtPlotItem *item, const QPainterPath &range)
	Remove XY samples within a path range.

Detailed Description

Utility class for reading and writing sample data from QwtPlotItem instances.

QwtPlotDataAccess provides type-safe static methods to extract or set sample data from any QwtPlotItem. The methods use the item's rtti to dispatch to the correct underlying QwtSeriesStore type.

Supported data types:

QwtPlotItem* item = ...;
QVector<QPointF> data = Qwt::QwtPlotDataAccess::xySamples(item);
if (!data.isEmpty()) {
    qDebug() << "First point:" << data.first();
}

See also: QwtPlotItemInfo, QwtSeriesStore

Member Function Documentation

◆ boxSamples()

QVector< QwtBoxSample > QwtPlotDataAccess::boxSamples ( const QwtPlotItem * item )

static

Extract box samples from a plot item.

Parameters

item	Plot item (must be QwtPlotBoxChart)

Returns: Vector of QwtBoxSample

◆ intervalSamples()

QVector< QwtIntervalSample > QwtPlotDataAccess::intervalSamples ( const QwtPlotItem * item )

static

Extract interval samples from a plot item.

Parameters

item	Plot item (must be QwtPlotIntervalCurve or QwtPlotHistogram)

Returns: Vector of QwtIntervalSample, empty if not supported

◆ ohlcSamples()

QVector< QwtOHLCSample > QwtPlotDataAccess::ohlcSamples ( const QwtPlotItem * item )

static

Extract OHLC samples from a plot item.

Parameters

item	Plot item (must be QwtPlotTradingCurve)

Returns: Vector of QwtOHLCSample

◆ removeSamplesInRange() [1/2]

int QwtPlotDataAccess::removeSamplesInRange	(	QwtPlotItem *	item,
		const QPainterPath &	range
	)

static

Remove XY samples within a path range.

Parameters

item	Plot item (must be QwtPlotCurve or QwtPlotBarChart)
range	Path range in data coordinates

Returns: Number of samples removed

◆ removeSamplesInRange() [2/2]

int QwtPlotDataAccess::removeSamplesInRange	(	QwtPlotItem *	item,
		const QRectF &	range
	)

static

Remove XY samples within a rectangular range.

Parameters

item	Plot item (must be QwtPlotCurve or QwtPlotBarChart)
range	Rectangular range in data coordinates

Returns: Number of samples removed

◆ setBoxSamples()

bool QwtPlotDataAccess::setBoxSamples	(	QwtPlotItem *	item,
		const QVector< QwtBoxSample > &	data
	)

static

Set box samples on a plot item.

Parameters

item	Plot item (must be QwtPlotBoxChart)
data	Box sample data

Returns: true if successful

◆ setIntervalSamples()

bool QwtPlotDataAccess::setIntervalSamples	(	QwtPlotItem *	item,
		const QVector< QwtIntervalSample > &	data
	)

static

Set interval samples on a plot item.

Parameters

item	Plot item (must be QwtPlotIntervalCurve or QwtPlotHistogram)
data	Interval sample data

Returns: true if successful

◆ setOhlcSamples()

bool QwtPlotDataAccess::setOhlcSamples	(	QwtPlotItem *	item,
		const QVector< QwtOHLCSample > &	data
	)

static

Set OHLC samples on a plot item.

Parameters

item	Plot item (must be QwtPlotTradingCurve)
data	OHLC sample data

Returns: true if successful

◆ setSamples()

QVector< QwtSetSample > QwtPlotDataAccess::setSamples ( const QwtPlotItem * item )

static

Extract set samples from a plot item.

Parameters

item	Plot item (must be QwtPlotMultiBarChart)

Returns: Vector of QwtSetSample

◆ setSetSamples()

bool QwtPlotDataAccess::setSetSamples	(	QwtPlotItem *	item,
		const QVector< QwtSetSample > &	data
	)

static

Set set samples on a plot item.

Parameters

item	Plot item (must be QwtPlotMultiBarChart)
data	Set sample data

Returns: true if successful

◆ setVectorFieldSamples()

bool QwtPlotDataAccess::setVectorFieldSamples	(	QwtPlotItem *	item,
		const QVector< QwtVectorFieldSample > &	data
	)

static

Set vector field samples on a plot item.

Parameters

item	Plot item (must be QwtPlotVectorField)
data	Vector field sample data

Returns: true if successful

◆ setXYSamples() [1/2]

bool QwtPlotDataAccess::setXYSamples	(	QwtPlotItem *	item,
		const QVector< double > &	x,
		const QVector< double > &	y
	)

static

Set XY samples from separate x and y vectors.

Parameters

item	Plot item (must be QwtPlotCurve)
x	X coordinate vector
y	Y coordinate vector

Returns: true if successful, false if item type is not supported

Note: Only QwtPlotCurve supports separate x/y vectors; QwtPlotBarChart is not supported here

◆ setXYSamples() [2/2]

bool QwtPlotDataAccess::setXYSamples	(	QwtPlotItem *	item,
		const QVector< QPointF > &	data
	)

static

Set XY samples on a plot item.

Parameters

item	Plot item (must be QwtPlotCurve or QwtPlotBarChart)
data	Sample data to set

Returns: true if successful, false if item type is not supported

◆ setXyzSamples()

bool QwtPlotDataAccess::setXyzSamples	(	QwtPlotItem *	item,
		const QVector< QwtPoint3D > &	data
	)

static

Set 3D point samples on a plot item.

Parameters

item	Plot item (must be QwtPlotSpectroCurve)
data	3D point data

Returns: true if successful

◆ vectorFieldSamples()

QVector< QwtVectorFieldSample > QwtPlotDataAccess::vectorFieldSamples ( const QwtPlotItem * item )

static

Extract vector field samples from a plot item.

Parameters

item	Plot item (must be QwtPlotVectorField)

Returns: Vector of QwtVectorFieldSample

◆ xySamples() [1/2]

QVector< QPointF > QwtPlotDataAccess::xySamples ( const QwtPlotItem * item )

static

Extract XY samples from a plot item.

Parameters

item	Plot item (must be QwtPlotCurve or QwtPlotBarChart)

Returns: Vector of QPointF samples, empty if item type is not supported

◆ xySamples() [2/2]

void QwtPlotDataAccess::xySamples	(	const QwtPlotItem *	item,
		QVector< double > &	x,
		QVector< double > &	y
	)

static

Extract XY samples into separate x and y vectors.

Parameters

	item	Plot item (must be QwtPlotCurve or QwtPlotBarChart)
[out]	x	Output vector for x coordinates
[out]	y	Output vector for y coordinates

◆ xySamplesInRange() [1/2]

QVector< QPointF > QwtPlotDataAccess::xySamplesInRange	(	const QwtPlotItem *	item,
		const QPainterPath &	range
	)

static

Extract XY samples within a path range.

Parameters

item	Plot item (must be QwtPlotCurve or QwtPlotBarChart)
range	Path range in data coordinates

Returns: Filtered samples that fall within the path

◆ xySamplesInRange() [2/2]

QVector< QPointF > QwtPlotDataAccess::xySamplesInRange	(	const QwtPlotItem *	item,
		const QRectF &	range
	)

static

Extract XY samples within a rectangular range.

Parameters

item	Plot item (must be QwtPlotCurve or QwtPlotBarChart)
range	Rectangular range in data coordinates

Returns: Filtered samples that fall within the range

◆ xyzSamples()

QVector< QwtPoint3D > QwtPlotDataAccess::xyzSamples ( const QwtPlotItem * item )

static

Extract 3D point samples from a plot item.

Parameters

item	Plot item (must be QwtPlotSpectroCurve)

Returns: Vector of QwtPoint3D samples

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

/home/runner/work/QWT/QWT/src/plot/qwt_plot_data_access.h
/home/runner/work/QWT/QWT/src/plot/qwt_plot_data_access.cpp

Static Public Member Functions

Detailed Description

Member Function Documentation

◆ boxSamples()

◆ intervalSamples()

◆ ohlcSamples()

◆ removeSamplesInRange() [1/2]

◆ removeSamplesInRange() [2/2]

◆ setBoxSamples()

◆ setIntervalSamples()

◆ setOhlcSamples()

◆ setSamples()

◆ setSetSamples()

◆ setVectorFieldSamples()

◆ setXYSamples() [1/2]

◆ setXYSamples() [2/2]

◆ setXyzSamples()

◆ vectorFieldSamples()

◆ xySamples() [1/2]

◆ xySamples() [2/2]

◆ xySamplesInRange() [1/2]

◆ xySamplesInRange() [2/2]

◆ xyzSamples()