Base class for plot items representing a series of samples. More...

#include <qwt_plot_seriesitem.h>

Inheritance diagram for QwtPlotSeriesItem:

Classes
class	PrivateData

Public Member Functions
	QwtPlotSeriesItem (const QString &title=QString())
	Constructor.

	QwtPlotSeriesItem (const QwtText &title)
	Constructor.

virtual	~QwtPlotSeriesItem ()
	Destructor.

void	setOrientation (Qt::Orientation)
	Set the orientation of the item.

Qt::Orientation	orientation () const

virtual void	draw (QPainter *, const QwtScaleMap &xMap, const QwtScaleMap &yMap, const QRectF &canvasRect) const QWT_OVERRIDE
	Draw the complete series.

virtual void	drawSeries (QPainter *painter, const QwtScaleMap &xMap, const QwtScaleMap &yMap, const QRectF &canvasRect, int from, int to) const =0
	Draw a subset of the samples.

virtual QRectF	boundingRect () const QWT_OVERRIDE

virtual void	updateScaleDiv (const QwtScaleDiv &, const QwtScaleDiv &) QWT_OVERRIDE
	Update the item to changes of the axes scale division.

Public Member Functions inherited from QwtPlotItem
	QwtPlotItem ()
	Constructor.

	QwtPlotItem (const QString &title)
	Constructor.

	QwtPlotItem (const QwtText &title)
	Constructor.

virtual	~QwtPlotItem ()
	Destroy the QwtPlotItem.

void	attach (QwtPlot *plot)
	Attach the item to a plot.

void	detach ()
	This method detaches a QwtPlotItem from any QwtPlot it has been associated with.

QwtPlot *	plot () const
	Return attached plot.

void	setTitle (const QString &title)
	Set a new title.

void	setTitle (const QwtText &title)
	Set a new title.

const QwtText &	title () const

virtual int	rtti () const
	Return rtti for the specific class represented.

void	setItemAttribute (ItemAttribute, bool on=true)
	Toggle an item attribute.

bool	testItemAttribute (ItemAttribute) const
	Test an item attribute.

void	setItemInterest (ItemInterest, bool on=true)
	Toggle an item interest.

bool	testItemInterest (ItemInterest) const
	Test an item interest.

void	setRenderHint (RenderHint, bool on=true)
	Toggle an render hint.

bool	testRenderHint (RenderHint) const
	Test a render hint.

void	setRenderThreadCount (uint numThreads)
	On multi core systems rendering of certain plot item ( f.e QwtPlotRasterItem ) can be done in parallel in several threads.

uint	renderThreadCount () const

void	setLegendIconSize (const QSize &)
	Set the size of the legend icon.

QSize	legendIconSize () const

double	z () const
	Plot items are painted in increasing z-order.

void	setZ (double z)
	Set the z value.

void	show ()
	Show the item.

void	hide ()
	Hide the item.

virtual void	setVisible (bool)
	Show/Hide the item.

bool	isVisible () const

void	setAxes (QwtAxisId xAxis, QwtAxisId yAxis)
	Set X and Y axis.

void	setXAxis (QwtAxisId)
	Set the X axis.

QwtAxisId	xAxis () const
	Return xAxis.

void	setYAxis (QwtAxisId)
	Set the Y axis.

QwtAxisId	yAxis () const
	Return yAxis.

virtual void	itemChanged ()
	Update the legend and call QwtPlot::autoRefresh() for the parent plot.

virtual void	legendChanged ()
	Update the legend of the parent plot.

virtual void	getCanvasMarginHint (const QwtScaleMap &xMap, const QwtScaleMap &yMap, const QRectF &canvasRect, double &left, double &top, double &right, double &bottom) const
	Calculate a hint for the canvas margin.

virtual void	updateLegend (const QwtPlotItem *, const QList< QwtLegendData > &)
	Update the item to changes of the legend info.

QRectF	scaleRect (const QwtScaleMap &, const QwtScaleMap &) const
	Calculate the bounding scale rectangle of 2 maps.

QRectF	paintRect (const QwtScaleMap &, const QwtScaleMap &) const
	Calculate the bounding paint rectangle of 2 maps.

virtual QList< QwtLegendData >	legendData () const
	Return all information, that is needed to represent the item on the legend.

virtual QwtGraphic	legendIcon (int index, const QSizeF &) const

Public Member Functions inherited from QwtAbstractSeriesStore
virtual	~QwtAbstractSeriesStore ()
	Destructor.

Protected Member Functions
virtual void	dataChanged () QWT_OVERRIDE
	dataChanged() indicates, that the series has been changed.

Protected Member Functions inherited from QwtPlotItem
QwtGraphic	defaultIcon (const QBrush &, const QSizeF &) const
	Return a default icon from a brush.

Protected Member Functions inherited from QwtAbstractSeriesStore
virtual void	setRectOfInterest (const QRectF &)=0
	Set a the "rectangle of interest" for the stored series.

virtual QRectF	dataRect () const =0

virtual size_t	dataSize () const =0

Additional Inherited Members
Public Types inherited from QwtPlotItem
enum	RttiValues { Rtti_PlotItem = 0 , Rtti_PlotGrid , Rtti_PlotScale , Rtti_PlotLegend , Rtti_PlotMarker , Rtti_PlotCurve , Rtti_PlotSpectroCurve , Rtti_PlotIntervalCurve , Rtti_PlotHistogram , Rtti_PlotSpectrogram , Rtti_PlotGraphic , Rtti_PlotTradingCurve , Rtti_PlotBarChart , Rtti_PlotMultiBarChart , Rtti_PlotShape , Rtti_PlotTextLabel , Rtti_PlotZone , Rtti_PlotVectorField , Rtti_PlotUserItem = 1000 }
	Runtime type information. More...

enum	ItemAttribute { Legend = 0x01 , AutoScale = 0x02 , Margins = 0x04 }
	Plot Item Attributes. More...

enum	ItemInterest { ScaleInterest = 0x01 , LegendInterest = 0x02 }
	Plot Item Interests/绘图项关注的事件类型 More...

enum	RenderHint { RenderAntialiased = 0x1 }
	Render hints. More...

Detailed Description

Base class for plot items representing a series of samples.

Constructor & Destructor Documentation

◆ QwtPlotSeriesItem() [1/2]

QwtPlotSeriesItem::QwtPlotSeriesItem ( const QString & title = QString() )

explicit

Constructor.

Parameters

title Title of the curve

◆ QwtPlotSeriesItem() [2/2]

QwtPlotSeriesItem::QwtPlotSeriesItem ( const QwtText & title )

explicit

Constructor.

Parameters

title Title of the curve

Member Function Documentation

◆ boundingRect()

QRectF QwtPlotSeriesItem::boundingRect ( ) const

virtual

Returns: An invalid bounding rect: QRectF(1.0, 1.0, -2.0, -2.0)

Note: A width or height < 0.0 is ignored by the autoscaler

Reimplemented from QwtPlotItem.

Reimplemented in QwtPlotBarChart, QwtPlotHistogram, QwtPlotIntervalCurve, QwtPlotMultiBarChart, QwtPlotTradingCurve, and QwtPlotVectorField.

◆ dataChanged()

void QwtPlotSeriesItem::dataChanged ( )

protectedvirtual

dataChanged() indicates, that the series has been changed.

Implements QwtAbstractSeriesStore.

Reimplemented in QwtPlotVectorField.

◆ draw()

void QwtPlotSeriesItem::draw	(	QPainter *	painter,
		const QwtScaleMap &	xMap,
		const QwtScaleMap &	yMap,
		const QRectF &	canvasRect
	)		const

virtual

Draw the complete series.

Parameters

painter	Painter
xMap	Maps x-values into pixel coordinates.
yMap	Maps y-values into pixel coordinates.
canvasRect	Contents rectangle of the canvas

Implements QwtPlotItem.

◆ drawSeries()

virtual void QwtPlotSeriesItem::drawSeries	(	QPainter *	painter,
		const QwtScaleMap &	xMap,
		const QwtScaleMap &	yMap,
		const QRectF &	canvasRect,
		int	from,
		int	to
	)		const

pure virtual

Draw a subset of the samples.

Parameters

painter	Painter
xMap	Maps x-values into pixel coordinates.
yMap	Maps y-values into pixel coordinates.
canvasRect	Contents rectangle of the canvas
from	Index of the first point to be painted
to	Index of the last point to be painted. If to < 0 the curve will be painted to its last point.

Implemented in QwtPlotBarChart, QwtPlotCurve, QwtPlotHistogram, QwtPlotIntervalCurve, QwtPlotMultiBarChart, QwtPlotSpectroCurve, QwtPlotTradingCurve, and QwtPlotVectorField.

◆ orientation()

Qt::Orientation QwtPlotSeriesItem::orientation ( ) const

Returns: Orientation of the plot item

See also: setOrientation()

◆ setOrientation()

void QwtPlotSeriesItem::setOrientation ( Qt::Orientation orientation )

Set the orientation of the item.

The orientation() might be used in specific way by a plot item. F.e. a QwtPlotCurve uses it to identify how to display the curve int QwtPlotCurve::Steps or QwtPlotCurve::Sticks style.

See also: orientation()

◆ updateScaleDiv()

void QwtPlotSeriesItem::updateScaleDiv	(	const QwtScaleDiv &	xScaleDiv,
		const QwtScaleDiv &	yScaleDiv
	)

virtual

Update the item to changes of the axes scale division.

Update the item, when the axes of plot have changed. The default implementation does nothing, but items that depend on the scale division (like QwtPlotGrid()) have to reimplement updateScaleDiv()

updateScaleDiv() is only called when the ScaleInterest interest is enabled. The default implementation does nothing.

Parameters

xScaleDiv	Scale division of the x-axis
yScaleDiv	Scale division of the y-axis

See also: QwtPlot::updateAxes(), ScaleInterest

Reimplemented from QwtPlotItem.

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

/home/runner/work/QWT/QWT/src/qwt_plot_seriesitem.h
/home/runner/work/QWT/QWT/src/qwt_plot_seriesitem.cpp

Classes

Public Member Functions

Protected Member Functions

Additional Inherited Members

Detailed Description

Constructor & Destructor Documentation

◆ QwtPlotSeriesItem() [1/2]

◆ QwtPlotSeriesItem() [2/2]

Member Function Documentation

◆ boundingRect()

◆ dataChanged()

◆ draw()

◆ drawSeries()

◆ orientation()

◆ setOrientation()

◆ updateScaleDiv()