QwtPlotBarChart displays a series of a values as bars. More...

#include <qwt_plot_barchart.h>

Inheritance diagram for QwtPlotBarChart:

Classes
class	PrivateData

Public Types
enum	LegendMode { LegendChartTitle , LegendBarTitles }
	Legend modes. More...

Public Types inherited from QwtPlotAbstractBarChart
enum	LayoutPolicy { AutoAdjustSamples , ScaleSamplesToAxes , ScaleSampleToCanvas , FixedSampleSize }
	Mode how to calculate the bar width. More...

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...

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

	QwtPlotBarChart (const QwtText &title)
	Constructor.

virtual	~QwtPlotBarChart ()
	Destructor.

virtual int	rtti () const QWT_OVERRIDE

void	setSamples (const QVector< QPointF > &)
	Initialize data with an array of points.

void	setSamples (const QVector< double > &)
	Initialize data with an array of doubles.

void	setSamples (QwtSeriesData< QPointF > *)
	Assign a series of samples.

void	setSymbol (QwtColumnSymbol *)
	Assign a symbol.

const QwtColumnSymbol *	symbol () const

void	setPen (const QPen &p)
	set bar symbol pen

QPen	pen () const
	bar symbol pen

void	setBrush (const QBrush &b)
	set bar symbol brush

QBrush	brush () const
	bar symbol brush

void	setFrameStyle (QwtColumnSymbol::FrameStyle f)
	set bar symbol frame style

QwtColumnSymbol::FrameStyle	frameStyle () const
	bar symbol frame style

void	setLegendMode (LegendMode)
	Set the mode that decides what to display on the legend.

LegendMode	legendMode () const

virtual void	drawSeries (QPainter *, const QwtScaleMap &xMap, const QwtScaleMap &yMap, const QRectF &canvasRect, int from, int to) const QWT_OVERRIDE
	Draw an interval of the bar chart.

virtual QRectF	boundingRect () const QWT_OVERRIDE

virtual QwtColumnSymbol *	specialSymbol (int sampleIndex, const QPointF &) const
	Needs to be overloaded to return a non default symbol for a specific sample.

virtual QwtText	barTitle (int sampleIndex) const
	Return the title of a bar.

Public Member Functions inherited from QwtPlotAbstractBarChart
	QwtPlotAbstractBarChart (const QwtText &title)
	Constructor.

virtual	~QwtPlotAbstractBarChart ()
	Destructor.

void	setLayoutPolicy (LayoutPolicy)
	The combination of layoutPolicy() and layoutHint() define how the width of the bars is calculated.

LayoutPolicy	layoutPolicy () const
	The combination of layoutPolicy() and layoutHint() define how the width of the bars is calculated.

void	setLayoutHint (double)
	The combination of layoutPolicy() and layoutHint() define how the width of the bars is calculated.

double	layoutHint () const
	The combination of layoutPolicy() and layoutHint() define how the width of the bars is calculated.

void	setSpacing (int)
	Set the spacing.

int	spacing () const

void	setMargin (int)
	Set the margin.

int	margin () const

void	setBaseline (double)
	Set the baseline.

double	baseline () const

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

Public Member Functions inherited from QwtPlotSeriesItem
	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	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

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	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.

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

Public Member Functions inherited from QwtSeriesStore< QPointF >
	QwtSeriesStore ()
	Constructor The store contains no series.

	~QwtSeriesStore ()
	Destructor.

void	setData (QwtSeriesData< QPointF > *series)
	Assign a series of samples.

QwtSeriesData< QPointF > *	data ()

const QwtSeriesData< QPointF > *	data () const

QPointF	sample (size_t index) const

virtual size_t	dataSize () const QWT_OVERRIDE

virtual QRectF	dataRect () const QWT_OVERRIDE

virtual void	setRectOfInterest (const QRectF &rect) QWT_OVERRIDE
	Set a the "rect of interest" for the series.

QwtSeriesData< QPointF > *	swapData (QwtSeriesData< QPointF > *series)
	Replace a series without deleting the previous one.

Protected Member Functions
virtual void	drawSample (QPainter *painter, const QwtScaleMap &xMap, const QwtScaleMap &yMap, const QRectF &canvasRect, const QwtInterval &boundingInterval, int index, const QPointF &sample) const
	Draw a sample.

virtual void	drawBar (QPainter *, int sampleIndex, const QPointF &sample, const QwtColumnRect &) const
	Draw a bar.

QwtColumnRect	columnRect (const QwtScaleMap &xMap, const QwtScaleMap &yMap, const QRectF &canvasRect, const QwtInterval &boundingInterval, const QPointF &sample) const
	Calculate the geometry of a bar in widget coordinates.

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

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

Protected Member Functions inherited from QwtPlotAbstractBarChart
double	sampleWidth (const QwtScaleMap &map, double canvasSize, double boundingSize, double value) const
	Calculate the width for a sample in paint device coordinates.

Protected Member Functions inherited from QwtPlotSeriesItem
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.

Detailed Description

QwtPlotBarChart displays a series of a values as bars.

Each bar might be customized individually by implementing a specialSymbol(). Otherwise it is rendered using a default symbol.

Depending on its orientation() the bars are displayed horizontally or vertically. The bars cover the interval between the baseline() and the value.

By activating the LegendBarTitles mode each sample will have its own entry on the legend.

The most common use case of a bar chart is to display a list of y coordinates, where the x coordinate is simply the index in the list. But for other situations ( f.e. when values are related to dates ) it is also possible to set x coordinates explicitly.

See also: QwtPlotMultiBarChart, QwtPlotHistogram, QwtPlotCurve::Sticks, QwtPlotSeriesItem::orientation(), QwtPlotAbstractBarChart::baseline()

Member Enumeration Documentation

◆ LegendMode

enum QwtPlotBarChart::LegendMode

Legend modes.

The default setting is QwtPlotBarChart::LegendChartTitle.

See also: setLegendMode(), legendMode()

Enumerator

LegendChartTitle

One entry on the legend showing the default symbol and the title() of the chart.

See also: QwtPlotItem::title()

LegendBarTitles

One entry for each value showing the individual symbol of the corresponding bar and the bar title.

See also: specialSymbol(), barTitle()

Constructor & Destructor Documentation

◆ QwtPlotBarChart() [1/2]

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

explicit

Constructor.

Parameters

title Title of the curve

◆ QwtPlotBarChart() [2/2]

QwtPlotBarChart::QwtPlotBarChart ( const QwtText & title )

explicit

Constructor.

Parameters

title Title of the curve

Member Function Documentation

◆ barTitle()

QwtText QwtPlotBarChart::barTitle ( int sampleIndex ) const

virtual

Return the title of a bar.

In LegendBarTitles mode the title is displayed on the legend entry corresponding to a bar.

The default implementation is a dummy, that is intended to be overloaded.

Parameters

sampleIndex Index of the bar

Returns: An empty text

See also: LegendBarTitles

◆ boundingRect()

QRectF QwtPlotBarChart::boundingRect ( ) const

virtual

Returns: Bounding rectangle of all samples. For an empty series the rectangle is invalid.

Reimplemented from QwtPlotSeriesItem.

◆ brush()

QBrush QwtPlotBarChart::brush ( ) const

bar symbol brush

Returns

◆ columnRect()

QwtColumnRect QwtPlotBarChart::columnRect	(	const QwtScaleMap &	xMap,
		const QwtScaleMap &	yMap,
		const QRectF &	canvasRect,
		const QwtInterval &	boundingInterval,
		const QPointF &	sample
	)		const

protected

Calculate the geometry of a bar in widget coordinates.

Parameters

xMap	x map
yMap	y map
canvasRect	Contents rect of the canvas
boundingInterval	Bounding interval of sample values
sample	Value of the sample

Returns: Geometry of the column

◆ drawBar()

void QwtPlotBarChart::drawBar	(	QPainter *	painter,
		int	sampleIndex,
		const QPointF &	sample,
		const QwtColumnRect &	rect
	)		const

protectedvirtual

Draw a bar.

Parameters

painter	Painter
sampleIndex	Index of the sample represented by the bar
sample	Value of the sample
rect	Bounding rectangle of the bar

◆ drawSample()

void QwtPlotBarChart::drawSample	(	QPainter *	painter,
		const QwtScaleMap &	xMap,
		const QwtScaleMap &	yMap,
		const QRectF &	canvasRect,
		const QwtInterval &	boundingInterval,
		int	index,
		const QPointF &	sample
	)		const

protectedvirtual

Draw a sample.

Parameters

painter	Painter
xMap	x map
yMap	y map
canvasRect	Contents rect of the canvas
boundingInterval	Bounding interval of sample values
index	Index of the sample
sample	Value of the sample

See also: drawSeries()

◆ drawSeries()

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

virtual

Draw an interval of the bar chart.

Parameters

painter	Painter
xMap	Maps x-values into pixel coordinates.
yMap	Maps y-values into pixel coordinates.
canvasRect	Contents rect 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.

See also: drawSymbols()

Implements QwtPlotSeriesItem.

◆ frameStyle()

QwtColumnSymbol::FrameStyle QwtPlotBarChart::frameStyle ( ) const

bar symbol frame style

Returns

◆ legendData()

QList< QwtLegendData > QwtPlotBarChart::legendData ( ) const

protectedvirtual

Return all information, that is needed to represent the item on the legend.

In case of LegendBarTitles an entry for each bar is returned, otherwise the chart is represented like any other plot item from its title() and the legendIcon().

Returns: Information, that is needed to represent the item on the legend

See also: title(), setLegendMode(), barTitle(), QwtLegend, QwtPlotLegendItem

Reimplemented from QwtPlotItem.

◆ legendIcon()

QwtGraphic QwtPlotBarChart::legendIcon	(	int	index,
		const QSizeF &	size
	)		const

protectedvirtual

Returns: Icon representing a bar or the chart on the legend

When the legendMode() is LegendBarTitles the icon shows the bar corresponding to index - otherwise the bar displays the default symbol.

Parameters

index	Index of the legend entry
size	Icon size

See also: setLegendMode(), drawBar(), QwtPlotItem::setLegendIconSize(), QwtPlotItem::legendData()

Reimplemented from QwtPlotItem.

◆ legendMode()

QwtPlotBarChart::LegendMode QwtPlotBarChart::legendMode ( ) const

Returns: Legend mode

See also: setLegendMode()

◆ pen()

QPen QwtPlotBarChart::pen ( ) const

bar symbol pen

Returns

◆ rtti()

int QwtPlotBarChart::rtti ( ) const

virtual

Returns: QwtPlotItem::Rtti_PlotBarChart

Reimplemented from QwtPlotItem.

◆ setBrush()

void QwtPlotBarChart::setBrush ( const QBrush & b )

set bar symbol brush

Parameters

b

◆ setFrameStyle()

void QwtPlotBarChart::setFrameStyle ( QwtColumnSymbol::FrameStyle f )

set bar symbol frame style

Parameters

f

◆ setLegendMode()

void QwtPlotBarChart::setLegendMode ( LegendMode mode )

Set the mode that decides what to display on the legend.

In case of LegendBarTitles barTitle() needs to be overloaded to return individual titles for each bar.

Parameters

mode New mode

See also: legendMode(), legendData(), barTitle(), QwtPlotItem::ItemAttribute

◆ setPen()

void QwtPlotBarChart::setPen ( const QPen & p )

set bar symbol pen

Parameters

pen

◆ setSamples() [1/3]

void QwtPlotBarChart::setSamples ( const QVector< double > & samples )

Initialize data with an array of doubles.

The indices in the array are taken as x coordinate, while the doubles are interpreted as y values.

Parameters

samples Vector of y coordinates

Note: QVector is implicitly shared

◆ setSamples() [2/3]

void QwtPlotBarChart::setSamples ( const QVector< QPointF > & samples )

Initialize data with an array of points.

Parameters

samples Vector of points

Note: QVector is implicitly shared; QPolygonF is derived from QVector<QPointF>

◆ setSamples() [3/3]

void QwtPlotBarChart::setSamples ( QwtSeriesData< QPointF > * data )

Assign a series of samples.

setSamples() is just a wrapper for setData() without any additional value - beside that it is easier to find for the developer.

Parameters

data Data

Warning: The item takes ownership of the data object, deleting it when its not used anymore.

◆ setSymbol()

void QwtPlotBarChart::setSymbol ( QwtColumnSymbol * symbol )

Assign a symbol.

The bar chart will take the ownership of the symbol, hence the previously set symbol will be delete by setting a new one. If symbol is NULL no symbol will be drawn.

Parameters

symbol Symbol

See also: symbol()

◆ specialSymbol()

QwtColumnSymbol * QwtPlotBarChart::specialSymbol	(	int	sampleIndex,
		const QPointF &	sample
	)		const

virtual

Needs to be overloaded to return a non default symbol for a specific sample.

Parameters

sampleIndex	Index of the sample represented by the bar
sample	Value of the sample

Returns: NULL, indicating to use the default symbol

◆ symbol()

const QwtColumnSymbol * QwtPlotBarChart::symbol ( ) const

Returns: Current symbol or NULL, when no symbol has been assigned

See also: setSymbol()

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

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

Classes

Public Types

Public Member Functions

Protected Member Functions

Detailed Description

Member Enumeration Documentation

◆ LegendMode

Constructor & Destructor Documentation

◆ QwtPlotBarChart() [1/2]

◆ QwtPlotBarChart() [2/2]

Member Function Documentation

◆ barTitle()

◆ boundingRect()

◆ brush()

◆ columnRect()

◆ drawBar()

◆ drawSample()

◆ drawSeries()

◆ frameStyle()

◆ legendData()

◆ legendIcon()

◆ legendMode()

◆ pen()

◆ rtti()

◆ setBrush()

◆ setFrameStyle()

◆ setLegendMode()

◆ setPen()

◆ setSamples() [1/3]

◆ setSamples() [2/3]

◆ setSamples() [3/3]

◆ setSymbol()

◆ specialSymbol()

◆ symbol()