QwtPlotHistogram 表示一系列样本，其中每个区间都与一个值相关联 ( $y = f([x1,x2])$ ) 更多...

#include <qwt_plot_histogram.h>

类 QwtPlotHistogram 继承关系图:

类
class	PrivateData

Public 类型
enum	HistogramStyle { Outline , Columns , Lines , UserStyle = 100 }
	直方图样式更多...

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 }
	运行时类型信息更多...

enum	ItemAttribute { Legend = 0x01 , AutoScale = 0x02 , Margins = 0x04 }
	绘图项属性更多...

enum	ItemInterest { ScaleInterest = 0x01 , LegendInterest = 0x02 }
	绘图项关注的事件类型更多...

enum	RenderHint { RenderAntialiased = 0x1 }
	渲染提示更多...

Public 成员函数
	QwtPlotHistogram (const QString &title=QString())
	QString标题的构造函数

	QwtPlotHistogram (const QwtText &title)
	QwtText标题的构造函数

virtual	~QwtPlotHistogram ()
	析构函数

virtual int	rtti () const override
	获取运行时类型信息

void	setPen (const QColor &, qreal width=0.0, Qt::PenStyle=Qt::SolidLine)
	构建并分配画笔

void	setPen (const QPen &)
	分配画笔，根据 style() 的不同而使用

const QPen &	pen () const
	获取根据 style() 不同使用的画笔

void	setBrush (const QBrush &)
	分配画刷，根据 style() 的不同而使用

const QBrush &	brush () const
	获取根据 style() 不同使用的画刷

void	setSamples (const QVector< QwtIntervalSample > &)
	用样本数组初始化数据

void	setSamples (QwtSeriesData< QwtIntervalSample > *)
	分配样本序列

void	setBaseline (double)
	设置基线的值

double	baseline () const
	获取基线的值

void	setStyle (HistogramStyle style)
	设置直方图的绘制样式

HistogramStyle	style () const
	获取直方图的绘制样式

void	setSymbol (const QwtColumnSymbol *)
	分配符号

const QwtColumnSymbol *	symbol () const
	获取当前符号

virtual void	drawSeries (QPainter *, const QwtScaleMap &xMap, const QwtScaleMap &yMap, const QRectF &canvasRect, int from, int to) const override
	绘制直方图样本的子集

virtual QRectF	boundingRect () const override
	获取所有样本的边界矩形

virtual QwtGraphic	legendIcon (int index, const QSizeF &) const override
	A plain rectangle without pen using the brush()

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

	QwtPlotSeriesItem (const QwtText &title)
	构造函数

virtual	~QwtPlotSeriesItem ()
	析构函数

void	setOrientation (Qt::Orientation)
	设置绘图项的方向

Qt::Orientation	orientation () const
	获取绘图项的方向

virtual void	draw (QPainter *, const QwtScaleMap &xMap, const QwtScaleMap &yMap, const QRectF &canvasRect) const override
	绘制完整系列

virtual void	updateScaleDiv (const QwtScaleDiv &, const QwtScaleDiv &) override
	更新刻度划分

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

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

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	getCanvasMarginHint (const QwtScaleMap &xMap, const QwtScaleMap &yMap, const QRectF &canvasRect, double &left, double &top, double &right, double &bottom) const
	Get margin hints for the canvas

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

Public 成员函数继承自 QwtSeriesStore< QwtIntervalSample >
void	setData (QwtSeriesData< QwtIntervalSample > *series)

QwtSeriesData< QwtIntervalSample > *	data ()

const QwtSeriesData< QwtIntervalSample > *	data () const

QwtIntervalSample	sample (size_t index) const

virtual size_t	dataSize () const override

virtual QRectF	dataRect () const override

virtual void	setRectOfInterest (const QRectF &rect) override
	Set a the "rectangle of interest" for the stored series

QwtSeriesData< QwtIntervalSample > *	swapData (QwtSeriesData< QwtIntervalSample > *series)

Protected 成员函数
virtual QwtColumnRect	columnRect (const QwtIntervalSample &, const QwtScaleMap &, const QwtScaleMap &) const
	Calculate the area that is covered by a sample

virtual void	drawColumn (QPainter *, const QwtColumnRect &, const QwtIntervalSample &) const
	Draw a column for a sample in Columns style().

void	drawColumns (QPainter *, const QwtScaleMap &xMap, const QwtScaleMap &yMap, int from, int to) const
	Draw a histogram in Columns style()

void	drawOutline (QPainter *, const QwtScaleMap &xMap, const QwtScaleMap &yMap, int from, int to) const
	Draw a histogram in Outline style()

void	drawLines (QPainter *, const QwtScaleMap &xMap, const QwtScaleMap &yMap, int from, int to) const
	Draw a histogram in Lines style()

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

详细描述

QwtPlotHistogram 表示一系列样本，其中每个区间都与一个值相关联 ( $y = f([x1,x2])$ )

成员枚举类型说明

◆ HistogramStyle

enum QwtPlotHistogram::HistogramStyle

直方图样式

枚举值
Outline	使用 pen() 在所有区间构建的区域周围绘制轮廓，并用 brush() 填充它。轮廓样式要求区间按递增顺序排列且不重叠。
Columns	为每个区间绘制一个列。当设置了 symbol() 时，使用该符号；否则，使用 pen() 和 brush() 将列显示为普通矩形。
Lines	使用 pen() 为每个区间绘制一条简单的线。
UserStyle	样式 >= UserStyle 保留给派生类使用，这些派生类用额外的应用特定方式重载 drawSeries() 来显示直方图。

构造及析构函数说明

◆ QwtPlotHistogram() [1/2]

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

explicit

QString标题的构造函数

◆ QwtPlotHistogram() [2/2]

QwtPlotHistogram::QwtPlotHistogram ( const QwtText & title )

explicit

QwtText标题的构造函数

◆ ~QwtPlotHistogram()

QwtPlotHistogram::~QwtPlotHistogram ( )

virtual

析构函数

成员函数说明

◆ baseline()

double QwtPlotHistogram::baseline ( ) const

获取基线的值

◆ boundingRect()

QRectF QwtPlotHistogram::boundingRect ( ) const

overridevirtual

获取所有样本的边界矩形

重载 QwtPlotSeriesItem .

◆ brush()

const QBrush & QwtPlotHistogram::brush ( ) const

获取根据 style() 不同使用的画刷

◆ columnRect()

QwtColumnRect QwtPlotHistogram::columnRect	(	const QwtIntervalSample &	sample,
		const QwtScaleMap &	xMap,
		const QwtScaleMap &	yMap
	)		const

protectedvirtual

Calculate the area that is covered by a sample

参数

sample	Sample
xMap	Maps x-values into pixel coordinates.
yMap	Maps y-values into pixel coordinates.

返回: Rectangle, that is covered by a sample

◆ drawColumn()

void QwtPlotHistogram::drawColumn	(	QPainter *	painter,
		const QwtColumnRect &	rect,
		const QwtIntervalSample &	sample
	)		const

protectedvirtual

Draw a column for a sample in Columns style().

When a symbol() has been set the symbol is used otherwise the column is displayed as plain rectangle using pen() and brush().

参数

painter	Painter
rect	Rectangle where to paint the column in paint device coordinates
sample	Sample to be displayed

注解: In applications, where different intervals need to be displayed in a different way ( f.e different colors or even using different symbols) it is recommended to overload drawColumn().

◆ drawColumns()

void QwtPlotHistogram::drawColumns	(	QPainter *	painter,
		const QwtScaleMap &	xMap,
		const QwtScaleMap &	yMap,
		int	from,
		int	to
	)		const

protected

Draw a histogram in Columns style()

参数

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

参见: setStyle(), style(), setSymbol(), drawColumn()

◆ drawLines()

void QwtPlotHistogram::drawLines	(	QPainter *	painter,
		const QwtScaleMap &	xMap,
		const QwtScaleMap &	yMap,
		int	from,
		int	to
	)		const

protected

Draw a histogram in Lines style()

参数

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

参见: setStyle(), style(), setPen()

◆ drawOutline()

void QwtPlotHistogram::drawOutline	(	QPainter *	painter,
		const QwtScaleMap &	xMap,
		const QwtScaleMap &	yMap,
		int	from,
		int	to
	)		const

protected

Draw a histogram in Outline style()

参数

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

参见: setStyle(), style()

警告: The outline style requires, that the intervals are in increasing order and not overlapping.

◆ drawSeries()

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

overridevirtual

绘制直方图样本的子集

实现了 QwtPlotSeriesItem.

◆ legendIcon()

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

overridevirtual

A plain rectangle without pen using the brush()

参数

index	Index of the legend entry ( ignored as there is only one )
size	Icon size

返回: A graphic displaying the icon

参见: QwtPlotItem::setLegendIconSize(), QwtPlotItem::legendData()

重载 QwtPlotItem .

◆ pen()

const QPen & QwtPlotHistogram::pen ( ) const

获取根据 style() 不同使用的画笔

◆ rtti()

int QwtPlotHistogram::rtti ( ) const

overridevirtual

获取运行时类型信息

重载 QwtPlotItem .

◆ setBaseline()

void QwtPlotHistogram::setBaseline ( double value )

设置基线的值

◆ setBrush()

void QwtPlotHistogram::setBrush ( const QBrush & brush )

分配画刷，根据 style() 的不同而使用

◆ setPen() [1/2]

void QwtPlotHistogram::setPen	(	const QColor &	color,
		qreal	width = `0.0`,
		Qt::PenStyle	style = `Qt::SolidLine`
	)

构建并分配画笔

◆ setPen() [2/2]

void QwtPlotHistogram::setPen ( const QPen & pen )

分配画笔，根据 style() 的不同而使用

◆ setSamples() [1/2]

void QwtPlotHistogram::setSamples ( const QVector< QwtIntervalSample > & samples )

用样本数组初始化数据

◆ setSamples() [2/2]

void QwtPlotHistogram::setSamples ( QwtSeriesData< QwtIntervalSample > * data )

分配样本序列

◆ setStyle()

void QwtPlotHistogram::setStyle ( HistogramStyle style )

设置直方图的绘制样式

◆ setSymbol()

void QwtPlotHistogram::setSymbol ( const QwtColumnSymbol * symbol )

分配符号

◆ style()

QwtPlotHistogram::HistogramStyle QwtPlotHistogram::style ( ) const

获取直方图的绘制样式

◆ symbol()

const QwtColumnSymbol * QwtPlotHistogram::symbol ( ) const

获取当前符号

该类的文档由以下文件生成:

/home/runner/work/QWT/QWT/src/plot/qwt_plot_histogram.h
/home/runner/work/QWT/QWT/src/plot/qwt_plot_histogram.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

◆ HistogramStyle

构造及析构函数说明

◆ QwtPlotHistogram() [1/2]

◆ QwtPlotHistogram() [2/2]

◆ ~QwtPlotHistogram()

成员函数说明

◆ baseline()

◆ boundingRect()

◆ brush()

◆ columnRect()

◆ drawColumn()

◆ drawColumns()

◆ drawLines()

◆ drawOutline()

◆ drawSeries()

◆ legendIcon()

◆ pen()

◆ rtti()

◆ setBaseline()

◆ setBrush()

◆ setPen() [1/2]

◆ setPen() [2/2]

◆ setSamples() [1/2]

◆ setSamples() [2/2]

◆ setStyle()

◆ setSymbol()

◆ style()

◆ symbol()