Abstract base class for bar chart items 更多...

#include <qwt_plot_abstract_barchart.h>

类 QwtPlotAbstractBarChart 继承关系图:

类
class	PrivateData

Public 类型
enum	LayoutPolicy { AutoAdjustSamples , ScaleSamplesToAxes , ScaleSampleToCanvas , FixedSampleSize }
	Mode how to calculate the bar width 更多...

Public 类型继承自 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_PlotArrowMarker , Rtti_PlotBoxChart , Rtti_PlotUserItem = 1000 }
	Runtime type information 更多...

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

enum	ItemInterest { ScaleInterest = 0x01 , LegendInterest = 0x02 }
	Plot Item Interests 更多...

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

Public 成员函数
	QwtPlotAbstractBarChart (const QwtText &title)
	Constructor

void	setLayoutPolicy (LayoutPolicy)
	Set the layout policy

LayoutPolicy	layoutPolicy () const
	Get the layout policy

void	setLayoutHint (double)
	Set the layout hint

double	layoutHint () const
	Get the layout hint

void	setSpacing (int)
	Set the spacing between bars

int	spacing () const
	Get the spacing between bars

void	setMargin (int)
	Set the margin around the bars

int	margin () const
	Get the margin around the bars

void	setBaseline (double)
	Set the baseline value

double	baseline () const
	Get the baseline value

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

Public 成员函数继承自 QwtPlotSeriesItem
	QwtPlotSeriesItem (const QString &title=QString())

	QwtPlotSeriesItem (const QwtText &title)
	Constructor

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

Qt::Orientation	orientation () const
	Get the orientation of the plot item

virtual void	draw (QPainter *, const QwtScaleMap &xMap, const QwtScaleMap &yMap, const QRectF &canvasRect) const 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 override
	Get the bounding rectangle

virtual void	updateScaleDiv (const QwtScaleDiv &, const QwtScaleDiv &) override
	Update the scale divisions

Public 成员函数继承自 QwtPlotItem
	QwtPlotItem ()
	Default constructor

	QwtPlotItem (const QString &title)
	Constructor with title as QString

	QwtPlotItem (const QwtText &title)
	Constructor with title as QwtText

virtual	~QwtPlotItem ()
	Destructor

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

void	detach ()
	Detach the item from the plot

QwtPlot *	plot () const
	Get the plot the item is attached to

void	setTitle (const QString &title)
	Set the title using a QString

void	setTitle (const QwtText &title)
	Set the title using a QwtText

const QwtText &	title () const
	Get the title

virtual int	rtti () const
	Runtime type information

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

bool	testItemAttribute (ItemAttribute) const
	Test an item attribute

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

bool	testItemInterest (ItemInterest) const
	Test an item interest

void	setRenderHint (RenderHint, bool on=true)
	Set a render hint

bool	testRenderHint (RenderHint) const
	Test a render hint

void	setRenderThreadCount (uint numThreads)
	Set the number of render threads

uint	renderThreadCount () const
	Get the number of render threads

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

QSize	legendIconSize () const
	Get the legend icon size

double	z () const
	Get the z-value

void	setZ (double z)
	Set the z-value

void	show ()
	Show the item

void	hide ()
	Hide the item

virtual void	setVisible (bool)
	Set the visibility

bool	isVisible () const
	Check if the item is visible

void	setAxes (QwtAxisId xAxis, QwtAxisId yAxis)
	Set both axes

void	setXAxis (QwtAxisId)
	Set the x-axis

QwtAxisId	xAxis () const
	Get the x-axis

void	setYAxis (QwtAxisId)
	Set the y-axis

QwtAxisId	yAxis () const
	Get the y-axis

virtual void	itemChanged ()
	Notify the plot that the item has changed

virtual void	legendChanged ()
	Notify the item that the legend has changed

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

QRectF	scaleRect (const QwtScaleMap &, const QwtScaleMap &) const
	Calculate the scale rectangle

QRectF	paintRect (const QwtScaleMap &, const QwtScaleMap &) const
	Calculate the paint rectangle

virtual QList< QwtLegendData >	legendData () const
	Return legend data

virtual QwtGraphic	legendIcon (int index, const QSizeF &) const
	Return a legend icon

Protected 成员函数
double	sampleWidth (const QwtScaleMap &map, double canvasSize, double boundingSize, double value) const
	Calculate the width for a sample in paint device coordinates

Protected 成员函数继承自 QwtPlotSeriesItem
virtual void	dataChanged () override
	dataChanged() indicates, that the series has been changed.

Protected 成员函数继承自 QwtPlotItem
QwtGraphic	defaultIcon (const QBrush &, const QSizeF &) const
	Create a default icon

Protected 成员函数继承自 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

详细描述

Abstract base class for bar chart items

In opposite to almost all other plot items bar charts can't be displayed inside of their bounding rectangle and need a special API how to calculate the width of the bars and how they affect the layout of the attached plot.

成员枚举类型说明

◆ LayoutPolicy

enum QwtPlotAbstractBarChart::LayoutPolicy

Mode how to calculate the bar width

setLayoutPolicy(), setLayoutHint(), barWidthHint()

枚举值
AutoAdjustSamples	The sample width is calculated by dividing the bounding rectangle by the number of samples. The layoutHint() is used as a minimum width in paint device coordinates. 参见 boundingRectangle()
ScaleSamplesToAxes	layoutHint() defines an interval in axis coordinates
ScaleSampleToCanvas	The bar width is calculated by multiplying layoutHint() with the height or width of the canvas. 参见 boundingRectangle()
FixedSampleSize	layoutHint() defines a fixed width in paint device coordinates.

构造及析构函数说明

◆ QwtPlotAbstractBarChart()

QwtPlotAbstractBarChart::QwtPlotAbstractBarChart ( const QwtText & title )

explicit

Constructor

参数

[in] title Title of the chart

Destructor

成员函数说明

◆ baseline()

double QwtPlotAbstractBarChart::baseline ( ) const

Get the baseline value

返回: Value for the origin of the bar chart

参见: setBaseline(), QwtPlotSeriesItem::orientation()

◆ getCanvasMarginHint()

void QwtPlotAbstractBarChart::getCanvasMarginHint	(	const QwtScaleMap &	xMap,
		const QwtScaleMap &	yMap,
		const QRectF &	canvasRect,
		double &	left,
		double &	top,
		double &	right,
		double &	bottom
	)		const

overridevirtual

Calculate a hint for the canvas margin

Bar charts need to reserve some space for displaying the bars for the first and the last sample. The hint is calculated from the layoutHint() depending on the layoutPolicy(). The margins are in target device coordinates ( pixels on screen ).

参数

[in]	xMap	Maps x-values into pixel coordinates.
[in]	yMap	Maps y-values into pixel coordinates.
[in]	canvasRect	Contents rectangle of the canvas in painter coordinates
[out]	left	Returns the left margin
[out]	top	Returns the top margin
[out]	right	Returns the right margin
[out]	bottom	Returns the bottom margin

参见: layoutPolicy(), layoutHint(), QwtPlotItem::Margins, QwtPlot::getCanvasMarginsHint(), QwtPlot::updateCanvasMargins()

重载 QwtPlotItem .

◆ layoutHint()

double QwtPlotAbstractBarChart::layoutHint ( ) const

Get the layout hint

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

返回: Layout hint of the chart item

参见: LayoutPolicy, setLayoutHint(), layoutPolicy()

◆ layoutPolicy()

QwtPlotAbstractBarChart::LayoutPolicy QwtPlotAbstractBarChart::layoutPolicy ( ) const

Get the layout policy

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

返回: Layout policy of the chart item

参见: setLayoutPolicy(), layoutHint()

◆ margin()

int QwtPlotAbstractBarChart::margin ( ) const

Get the margin around the bars

返回: Margin between the outmost bars and the contentsRect() of the canvas.

参见: setMargin(), spacing()

◆ sampleWidth()

double QwtPlotAbstractBarChart::sampleWidth	(	const QwtScaleMap &	map,
		double	canvasSize,
		double	boundingSize,
		double	value
	)		const

protected

Calculate the width for a sample in paint device coordinates

参数

map	Scale map for the corresponding scale
canvasSize	Size of the canvas in paint device coordinates
boundingSize	Bounding size of the chart in plot coordinates ( used in AutoAdjustSamples mode )
value	Value of the sample

返回: Sample width

参见: layoutPolicy(), layoutHint()

◆ setBaseline()

void QwtPlotAbstractBarChart::setBaseline ( double value )

Set the baseline value

The baseline is the origin for the chart. Each bar is painted from the baseline in the direction of the sample value. In case of a horizontal orientation() the baseline is interpreted as x - otherwise as y - value. The default value for the baseline is 0.

参数

[in] value Value for the baseline

参见: baseline(), QwtPlotSeriesItem::orientation()

◆ setLayoutHint()

void QwtPlotAbstractBarChart::setLayoutHint ( double hint )

Set the layout hint

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

参数

[in] hint Layout hint

参见: LayoutPolicy, layoutPolicy(), layoutHint()

◆ setLayoutPolicy()

void QwtPlotAbstractBarChart::setLayoutPolicy ( LayoutPolicy policy )

Set the layout policy

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

参数

[in] policy Layout policy

参见: layoutPolicy(), layoutHint()

◆ setMargin()

void QwtPlotAbstractBarChart::setMargin ( int margin )

Set the margin around the bars

The margin is the distance between the outmost bars and the contentsRect() of the canvas. The default setting is 5 pixels.

参数

[in] margin Margin in pixels

参见: spacing(), margin()

◆ setSpacing()

void QwtPlotAbstractBarChart::setSpacing ( int spacing )

Set the spacing between bars

The spacing is the distance between 2 samples ( bars for QwtPlotBarChart or a group of bars for QwtPlotMultiBarChart ) in paint device coordinates.

参数

[in] spacing Spacing in pixels

参见: spacing()

◆ spacing()

int QwtPlotAbstractBarChart::spacing ( ) const

Get the spacing between bars

返回: Spacing between 2 samples ( bars or groups of bars )

参见: setSpacing(), margin()

该类的文档由以下文件生成:

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

类

Public 类型

Public 成员函数

Protected 成员函数

详细描述

成员枚举类型说明

◆ LayoutPolicy

构造及析构函数说明

◆ QwtPlotAbstractBarChart()

成员函数说明

◆ baseline()

◆ getCanvasMarginHint()

◆ layoutHint()

◆ layoutPolicy()

◆ margin()

◆ sampleWidth()

◆ setBaseline()

◆ setLayoutHint()

◆ setLayoutPolicy()

◆ setMargin()

◆ setSpacing()

◆ spacing()