QwtPlotMultiBarChart displays a series of a samples that consist each of a set of values. More...

#include <qwt_plot_multi_barchart.h>

Inheritance diagram for QwtPlotMultiBarChart:

Classes
class	PrivateData

Public Types
enum	ChartStyle { Grouped , Stacked }
	Chart styles. 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
	QwtPlotMultiBarChart (const QString &title=QString())
	Constructor.

	QwtPlotMultiBarChart (const QwtText &title)
	Constructor.

virtual	~QwtPlotMultiBarChart ()
	Destructor.

virtual int	rtti () const QWT_OVERRIDE

void	setBarTitles (const QList< QwtText > &)
	Set the titles for the bars.

QList< QwtText >	barTitles () const

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

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

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

void	setStyle (ChartStyle style)
	Set the style of the chart.

ChartStyle	style () const

void	setSymbol (int valueIndex, QwtColumnSymbol *)
	Add a symbol to the symbol map.

const QwtColumnSymbol *	symbol (int valueIndex) const
	Find a symbol in the symbol map.

void	resetSymbolMap ()
	Remove all symbols from the symbol map.

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 QList< QwtLegendData >	legendData () const QWT_OVERRIDE

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

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< QwtSetSample >
	QwtSeriesStore ()
	Constructor The store contains no series.

	~QwtSeriesStore ()
	Destructor.

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

QwtSeriesData< QwtSetSample > *	data ()

const QwtSeriesData< QwtSetSample > *	data () const

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

Protected Member Functions
QwtColumnSymbol *	symbol (int valueIndex)
	Find a symbol in the symbol map.

virtual QwtColumnSymbol *	specialSymbol (int sampleIndex, int valueIndex) const
	Create a symbol for special values.

virtual void	drawSample (QPainter *, const QwtScaleMap &xMap, const QwtScaleMap &yMap, const QRectF &canvasRect, const QwtInterval &boundingInterval, int index, const QwtSetSample &) const
	Draw a sample.

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

void	drawStackedBars (QPainter *, const QwtScaleMap &xMap, const QwtScaleMap &yMap, const QRectF &canvasRect, int index, double sampleWidth, const QwtSetSample &) const
	Draw a stacked sample.

void	drawGroupedBars (QPainter *, const QwtScaleMap &xMap, const QwtScaleMap &yMap, const QRectF &canvasRect, int index, double sampleWidth, const QwtSetSample &) const
	Draw a grouped sample.

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

QwtPlotMultiBarChart displays a series of a samples that consist each of a set of values.

Each value is displayed as a bar, the bars of each set can be organized side by side or accumulated.

Each bar of a set is rendered by a QwtColumnSymbol, that is set by setSymbol(). The bars of different sets use the same symbols. Exceptions are possible by overloading specialSymbol() or overloading drawBar().

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

In opposite to most other plot items, QwtPlotMultiBarChart returns more than one entry for the legend - one for each symbol.

See also: QwtPlotBarChart, QwtPlotHistogram QwtPlotSeriesItem::orientation(), QwtPlotAbstractBarChart::baseline()

Member Enumeration Documentation

◆ ChartStyle

enum QwtPlotMultiBarChart::ChartStyle

Chart styles.

The default setting is QwtPlotMultiBarChart::Grouped.

See also: setStyle(), style()

Enumerator

Grouped

The bars of a set are displayed side by side.

Stacked

The bars are displayed on top of each other accumulating to a single bar.

All values of a set need to have the same sign.

Constructor & Destructor Documentation

◆ QwtPlotMultiBarChart() [1/2]

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

explicit

Constructor.

Parameters

title Title of the chart

◆ QwtPlotMultiBarChart() [2/2]

QwtPlotMultiBarChart::QwtPlotMultiBarChart ( const QwtText & title )

explicit

Constructor.

Parameters

title Title of the chart

Member Function Documentation

◆ barTitles()

QList< QwtText > QwtPlotMultiBarChart::barTitles ( ) const

Returns: Bar titles

See also: setBarTitles(), legendData()

◆ boundingRect()

QRectF QwtPlotMultiBarChart::boundingRect ( ) const

virtual

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

Reimplemented from QwtPlotSeriesItem.

◆ drawBar()

void QwtPlotMultiBarChart::drawBar	(	QPainter *	painter,
		int	sampleIndex,
		int	valueIndex,
		const QwtColumnRect &	rect
	)		const

protectedvirtual

Draw a bar.

Parameters

painter	Painter
sampleIndex	Index of the sample - might be -1 when the bar is painted for the legend
valueIndex	Index of a value in a set
rect	Directed target rectangle for the bar

See also: drawSeries()

◆ drawGroupedBars()

void QwtPlotMultiBarChart::drawGroupedBars	(	QPainter *	painter,
		const QwtScaleMap &	xMap,
		const QwtScaleMap &	yMap,
		const QRectF &	canvasRect,
		int	index,
		double	sampleWidth,
		const QwtSetSample &	sample
	)		const

protected

Draw a grouped sample.

Parameters

painter	Painter
xMap	x map
yMap	y map
canvasRect	Contents rectangle of the canvas
index	Index of the sample to be painted
sampleWidth	Bounding width for all bars of the sample
sample	Sample

See also: drawSeries(), sampleWidth()

◆ drawSample()

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

protectedvirtual

Draw a sample.

Parameters

painter	Painter
xMap	x map
yMap	y map
canvasRect	Contents rectangle of the canvas
boundingInterval	Bounding interval of sample values
index	Index of the sample to be painted
sample	Sample value

See also: drawSeries()

◆ drawSeries()

void QwtPlotMultiBarChart::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 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.

See also: drawSymbols()

Implements QwtPlotSeriesItem.

◆ drawStackedBars()

void QwtPlotMultiBarChart::drawStackedBars	(	QPainter *	painter,
		const QwtScaleMap &	xMap,
		const QwtScaleMap &	yMap,
		const QRectF &	canvasRect,
		int	index,
		double	sampleWidth,
		const QwtSetSample &	sample
	)		const

protected

Draw a stacked sample.

Parameters

painter	Painter
xMap	x map
yMap	y map
canvasRect	Contents rectangle of the canvas
index	Index of the sample to be painted
sampleWidth	Width of the bars
sample	Sample

See also: drawSeries(), sampleWidth()

◆ legendData()

QList< QwtLegendData > QwtPlotMultiBarChart::legendData ( ) const

virtual

Returns: Information to be displayed on the legend

The chart is represented by a list of entries - one for each bar title. Each element contains a bar title and an icon showing its corresponding bar.

See also: barTitles(), legendIcon(), legendIconSize()

Reimplemented from QwtPlotItem.

◆ legendIcon()

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

virtual

Returns: Icon for representing a bar on the legend

Parameters

index	Index of the bar
size	Icon size

Returns: An icon showing a bar

See also: drawBar(), legendData()

Reimplemented from QwtPlotItem.

◆ rtti()

int QwtPlotMultiBarChart::rtti ( ) const

virtual

Returns: QwtPlotItem::Rtti_PlotBarChart

Reimplemented from QwtPlotItem.

◆ setBarTitles()

void QwtPlotMultiBarChart::setBarTitles ( const QList< QwtText > & titles )

Set the titles for the bars.

The titles are used for the legend.

Parameters

titles Bar titles

See also: barTitles(), legendData()

◆ setSamples() [1/3]

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

Initialize data with an array of samples.

Parameters

samples Vector of points

◆ setSamples() [2/3]

void QwtPlotMultiBarChart::setSamples ( const QVector< QwtSetSample > & samples )

Initialize data with an array of samples.

Parameters

samples Vector of points

◆ setSamples() [3/3]

void QwtPlotMultiBarChart::setSamples ( QwtSeriesData< QwtSetSample > * 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.

◆ setStyle()

void QwtPlotMultiBarChart::setStyle ( ChartStyle style )

Set the style of the chart.

Parameters

style Chart style

See also: style()

◆ setSymbol()

void QwtPlotMultiBarChart::setSymbol	(	int	valueIndex,
		QwtColumnSymbol *	symbol
	)

Add a symbol to the symbol map.

Assign a default symbol for drawing the bar representing all values with the same index in a set.

Parameters

valueIndex	Index of a value in a set
symbol	Symbol used for drawing a bar

See also: symbol(), resetSymbolMap(), specialSymbol()

◆ specialSymbol()

QwtColumnSymbol * QwtPlotMultiBarChart::specialSymbol	(	int	sampleIndex,
		int	valueIndex
	)		const

protectedvirtual

Create a symbol for special values.

Usually the symbols for displaying a bar are set by setSymbols() and common for all sets. By overloading specialSymbol() it is possible to create a temporary symbol() for displaying a special value.

The symbol has to be created by new each time specialSymbol() is called. As soon as the symbol is painted this symbol gets deleted.

When no symbol ( NULL ) is returned, the value will be displayed with the standard symbol that is used for all symbols with the same valueIndex.

Parameters

sampleIndex	Index of the sample
valueIndex	Index of the value in the set

Returns: NULL, meaning that the value is not special

◆ style()

QwtPlotMultiBarChart::ChartStyle QwtPlotMultiBarChart::style ( ) const

Returns: Style of the chart

See also: setStyle()

◆ symbol() [1/2]

QwtColumnSymbol * QwtPlotMultiBarChart::symbol ( int valueIndex )

protected

Find a symbol in the symbol map.

Parameters

valueIndex Index of a value in a set

Returns: The symbol, that had been set by setSymbol() or NULL.

See also: setSymbol(), specialSymbol(), drawBar()

◆ symbol() [2/2]

const QwtColumnSymbol * QwtPlotMultiBarChart::symbol ( int valueIndex ) const

Find a symbol in the symbol map.

Parameters

valueIndex Index of a value in a set

Returns: The symbol, that had been set by setSymbol() or NULL.

See also: setSymbol(), specialSymbol(), drawBar()

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

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

Classes

Public Types

Public Member Functions

Protected Member Functions

Detailed Description

Member Enumeration Documentation

◆ ChartStyle

Constructor & Destructor Documentation

◆ QwtPlotMultiBarChart() [1/2]

◆ QwtPlotMultiBarChart() [2/2]

Member Function Documentation

◆ barTitles()

◆ boundingRect()

◆ drawBar()

◆ drawGroupedBars()

◆ drawSample()

◆ drawSeries()

◆ drawStackedBars()

◆ legendData()

◆ legendIcon()

◆ rtti()

◆ setBarTitles()

◆ setSamples() [1/3]

◆ setSamples() [2/3]

◆ setSamples() [3/3]

◆ setStyle()

◆ setSymbol()

◆ specialSymbol()

◆ style()

◆ symbol() [1/2]

◆ symbol() [2/2]