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 Member Functions
QList< QwtText >	barTitles () const
virtual QRectF	boundingRect () const
virtual void	drawSeries (QPainter *painter, const QwtScaleMap &xMap, const QwtScaleMap &yMap, const QRectF &canvasRect, int from, int to) const
virtual QList< QwtLegendData >	legendData () const
virtual QwtGraphic	legendIcon (int index, const QSizeF &) const
	QwtPlotMultiBarChart (const QString &title=QString::null)
	QwtPlotMultiBarChart (const QwtText &title)
void	resetSymbolMap ()
virtual int	rtti () const
void	setBarTitles (const QList< QwtText > &)
	Set the titles for the bars.
void	setSamples (const QVector< QwtSetSample > &)
void	setSamples (const QVector< QVector< double > > &)
void	setSamples (QwtSeriesData< QwtSetSample > *)
void	setStyle (ChartStyle style)
void	setSymbol (int barIndex, QwtColumnSymbol *symbol)
	Add a symbol to the symbol map.
ChartStyle	style () const
const QwtColumnSymbol *	symbol (int barIndex) const
virtual	~QwtPlotMultiBarChart ()
	Destructor.
Protected Member Functions
virtual void	drawBar (QPainter *, int sampleIndex, int barIndex, const QwtColumnRect &) const
void	drawGroupedBars (QPainter *painter, const QwtScaleMap &xMap, const QwtScaleMap &yMap, const QRectF &canvasRect, int index, double sampleWidth, const QwtSetSample &sample) const
virtual void	drawSample (QPainter *painter, const QwtScaleMap &xMap, const QwtScaleMap &yMap, const QRectF &canvasRect, const QwtInterval &boundingInterval, int index, const QwtSetSample &sample) const
void	drawStackedBars (QPainter *painter, const QwtScaleMap &xMap, const QwtScaleMap &yMap, const QRectF &canvasRect, int index, double sampleWidth, const QwtSetSample &sample) const
virtual QwtColumnSymbol *	specialSymbol (int sampleIndex, int valueIndex) const
	Create a symbol for special values.
QwtColumnSymbol *	symbol (int barIndex)
Private Member Functions
void	init ()
Private Attributes
PrivateData *	d_data

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()

Definition at line 41 of file qwt_plot_multi_barchart.h.

Member Enumeration Documentation

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.

Definition at line 51 of file qwt_plot_multi_barchart.h.

Constructor & Destructor Documentation

QwtPlotMultiBarChart::QwtPlotMultiBarChart ( const QString & title = QString::null ) [explicit]

Constructor

Parameters:

title Title of the chart

Definition at line 60 of file qwt_plot_multi_barchart.cpp.

QwtPlotMultiBarChart::QwtPlotMultiBarChart ( const QwtText & title ) [explicit]

Constructor

Parameters:

title Title of the chart

Definition at line 50 of file qwt_plot_multi_barchart.cpp.

QwtPlotMultiBarChart::~QwtPlotMultiBarChart ( ) [virtual]

Destructor.

Definition at line 67 of file qwt_plot_multi_barchart.cpp.

Member Function Documentation

QList< QwtText > QwtPlotMultiBarChart::barTitles ( ) const

Returns:: Bar titles

See also:: setBarTitles(), legendData()

Definition at line 144 of file qwt_plot_multi_barchart.cpp.

QRectF QwtPlotMultiBarChart::boundingRect ( ) const [virtual]

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

Reimplemented from QwtPlotSeriesItem.

Definition at line 303 of file qwt_plot_multi_barchart.cpp.

void QwtPlotMultiBarChart::drawBar	(	QPainter *	painter,
		int	sampleIndex,
		int	valueIndex,
		const QwtColumnRect &	rect
	)		const `[protected, virtual]`

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()

Definition at line 654 of file qwt_plot_multi_barchart.cpp.

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	Boundng width for all bars of the smaple
sample	Sample

See also:: drawSeries(), sampleWidth()

Definition at line 462 of file qwt_plot_multi_barchart.cpp.

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

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()

Definition at line 416 of file qwt_plot_multi_barchart.cpp.

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.

Definition at line 375 of file qwt_plot_multi_barchart.cpp.

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()

Definition at line 542 of file qwt_plot_multi_barchart.cpp.

void QwtPlotMultiBarChart::init ( ) [private]

Definition at line 73 of file qwt_plot_multi_barchart.cpp.

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.

Definition at line 689 of file qwt_plot_multi_barchart.cpp.

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.

Definition at line 725 of file qwt_plot_multi_barchart.cpp.

void QwtPlotMultiBarChart::resetSymbolMap ( )

Remove all symbols from the symbol map

Definition at line 233 of file qwt_plot_multi_barchart.cpp.

int QwtPlotMultiBarChart::rtti ( ) const [virtual]

Returns:: QwtPlotItem::Rtti_PlotBarChart

Reimplemented from QwtPlotItem.

Definition at line 80 of file qwt_plot_multi_barchart.cpp.

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()

Definition at line 134 of file qwt_plot_multi_barchart.cpp.

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

Initialize data with an array of samples.

Parameters:

samples Vector of points

Definition at line 89 of file qwt_plot_multi_barchart.cpp.

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

Initialize data with an array of samples.

Parameters:

samples Vector of points

Definition at line 99 of file qwt_plot_multi_barchart.cpp.

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.

Definition at line 119 of file qwt_plot_multi_barchart.cpp.

void QwtPlotMultiBarChart::setStyle ( ChartStyle style )

Set the style of the chart

Parameters:

style Chart style

See also:: style()

Definition at line 279 of file qwt_plot_multi_barchart.cpp.

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()

Definition at line 160 of file qwt_plot_multi_barchart.cpp.

QwtColumnSymbol * QwtPlotMultiBarChart::specialSymbol	(	int	sampleIndex,
		int	valueIndex
	)		const `[protected, virtual]`

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: