QAbstractSeries 類

QAbstractSeries 類是所有 Qt Charts 係列的基類。 更多...

頭：	#include <QAbstractSeries>
實例化：	AbstractSeries
繼承：	QObject
繼承者：	QAbstractBarSeries , QAreaSeries , QBoxPlotSeries , QCandlestickSeries , QPieSeries ，和 QXYSeries

• 所有成員列錶，包括繼承成員

公共類型

enum	SeriesType { SeriesTypeLine, SeriesTypeArea, SeriesTypeBar, SeriesTypeStackedBar, SeriesTypePercentBar, …, SeriesTypeCandlestick }

特性

name : QString opacity : qreal type : const SeriesType

useOpenGL : bool visible : bool

公共函數

virtual	~QAbstractSeries ()
bool	attachAxis (QAbstractAxis * axis )
QList<QAbstractAxis *>	attachedAxes ()
QChart *	chart () const
bool	detachAxis (QAbstractAxis * axis )
void	hide ()
bool	isVisible () const
QString	name () const
qreal	opacity () const
void	setName (const QString & name )
void	setOpacity (qreal opacity )
void	setUseOpenGL (bool enable = true)
void	setVisible (bool visible = true)
void	show ()
virtual QAbstractSeries::SeriesType	type () const = 0
bool	useOpenGL () const

信號

void	nameChanged ()
void	opacityChanged ()
void	useOpenGLChanged ()
void	visibleChanged ()

詳細描述

通常，使用繼承類的特定於係列類型而不是基類。

另請參閱 QXYSeries , QLineSeries , QSplineSeries , QScatterSeries , QAreaSeries , QAbstractBarSeries , QBarSeries , QStackedBarSeries , QPercentBarSeries , QHorizontalBarSeries , QHorizontalStackedBarSeries , QHorizontalPercentBarSeries ，和 QPieSeries .

成員類型文檔編製

enum QAbstractSeries:: SeriesType

此枚舉描述係列的類型。

常量	值	描述
QAbstractSeries::SeriesTypeLine	0	綫圖錶。
QAbstractSeries::SeriesTypeArea	1	An area chart.
QAbstractSeries::SeriesTypeBar	2	A vertical bar chart.
QAbstractSeries::SeriesTypeStackedBar	3	A vertical stacked bar chart.
QAbstractSeries::SeriesTypePercentBar	4	A vertical percent bar chart.
QAbstractSeries::SeriesTypePie	5	餅狀圖錶。
QAbstractSeries::SeriesTypeScatter	6	散點圖錶。
QAbstractSeries::SeriesTypeSpline	7	A spline chart.
QAbstractSeries::SeriesTypeHorizontalBar	8	A horizontal bar chart.
QAbstractSeries::SeriesTypeHorizontalStackedBar	9	A horizontal stacked bar chart.
QAbstractSeries::SeriesTypeHorizontalPercentBar	10	A horizontal percent bar chart.
QAbstractSeries::SeriesTypeBoxPlot	11	A box plot chart.
QAbstractSeries::SeriesTypeCandlestick	12	A candlestick chart.

特性文檔編製

name : QString

This property holds the name of the series.

The name is displayed in the legend for the series and it supports HTML formatting.

訪問函數：

QString	name () const
void	setName (const QString & name )

通知程序信號：

void	nameChanged ()

opacity : qreal

This property holds the opacity of the series.

By default, the opacity is 1.0. The valid values range from 0.0 (transparent) to 1.0 (opaque).

訪問函數：

qreal	opacity () const
void	setOpacity (qreal opacity )

通知程序信號：

void	opacityChanged ()

type : const SeriesType

This property holds the type of the series.

訪問函數：

virtual QAbstractSeries::SeriesType

type () const = 0

useOpenGL : bool

Specifies whether or not drawing the series is accelerated by using OpenGL.

Acceleration using OpenGL is supported only for QLineSeries and QScatterSeries . A line series used as an edge series for QAreaSeries cannot use OpenGL acceleration. When a chart contains any series that are drawn with OpenGL, a transparent QOpenGLWidget is created on top of the chart plot area. The accelerated series are not drawn on the underlying QGraphicsView , but are instead drawn on the created QOpenGLWidget .

Performance gained from using OpenGL to accelerate series drawing depends on the underlying hardware, but in most cases it is significant. For example, on a standard desktop computer, enabling OpenGL acceleration for a series typically allows rendering at least a hundred times more points without reduction on the frame rate. Chart size also has less effect on the frame rate.

The OpenGL acceleration of series drawing is meant for use cases that need fast drawing of large numbers of points. It is optimized for efficiency, and therefore the series using it lack support for many features available to non-accelerated series:

• Series animations are not supported for accelerated series.
• Point labels are not supported for accelerated series.
• Pen styles and marker shapes are ignored for accelerated series. Only solid lines and plain scatter dots are supported. The scatter dots may be circular or rectangular, depending on the underlying graphics hardware and drivers.
• Polar charts do not support accelerated series.
• Enabling chart drop shadow or using transparent chart background color is not recommended when using accelerated series, as that can slow the frame rate down significantly.

These additional restrictions stem from the fact that the accelerated series is drawn on a separate widget on top of the chart:

• If you draw any graphics items on top of a chart containing an accelerated series, the accelerated series is drawn over those items.
• 要啓用 QOpenGLWidget to be partially transparent, it needs to be stacked on top of all other widgets. This means you cannot have other widgets partially covering the chart when using accelerated series.
• Accelerated series are not supported for use cases where the graphics scene has more than one graphics view attached to it.
• Accelerated series are not supported for use cases where the chart has non-default geometry. For example, adding transforms to the graphics view causes the accelerated series to be drawn in an incorrect position related to the chart.

默認值為 false .

訪問函數：

bool	useOpenGL () const
void	setUseOpenGL (bool enable = true)

通知程序信號：

void	useOpenGLChanged ()

visible : bool

This property holds whether the series is visible or not.

默認情況下， true .

訪問函數：

bool	isVisible () const
void	setVisible (bool visible = true)

通知程序信號：

void	visibleChanged ()

成員函數文檔編製

[signal] void QAbstractSeries:: nameChanged ()

This signal is emitted when the series name changes.

注意： 通知程序信號對於特性 name .

[signal] void QAbstractSeries:: opacityChanged ()

This signal is emitted when the opacity of the series changes.

注意： 通知程序信號對於特性 opacity .

[signal] void QAbstractSeries:: useOpenGLChanged ()

This signal is emitted when accelerating the drawing of the series by using OpenGL is enabled or disabled.

注意： 通知程序信號對於特性 useOpenGL .

[signal] void QAbstractSeries:: visibleChanged ()

This signal is emitted when the series visibility changes.

注意： 通知程序信號對於特性 visible .

[虛擬] QAbstractSeries:: ~QAbstractSeries ()

Virtual destructor for the chart series.

bool QAbstractSeries:: attachAxis ( QAbstractAxis * axis )

附加軸的指定是通過 axis 到係列。

返迴 true 若軸附加成功， false 否則。

注意： If multiple axes of the same orientation are attached to the same series, they will have the same minimum and maximum values.

另請參閱 QChart::addAxis () 和 QChart::createDefaultAxes ().

QList < QAbstractAxis *> QAbstractSeries:: attachedAxes ()

Returns the list of axes attached to the series. Usually, an x-axis and a y-axis are attached to a series, except for QPieSeries , which does not have any axes attached.

另請參閱 attachAxis () 和 detachAxis ().

QChart *QAbstractSeries:: chart () const

Returns the chart that the series belongs to.

Set automatically when the series is added to the chart, and unset when the series is removed from the chart.

bool QAbstractSeries:: detachAxis ( QAbstractAxis * axis )

Detaches the axis specified by axis from the series.

返迴 true if the axis was detached successfully, false 否則。

另請參閱 QChart::removeAxis ().

void QAbstractSeries:: hide ()

Sets the visibility of the series to false .

另請參閱 setVisible () 和 isVisible ().

void QAbstractSeries:: show ()

Sets the visibility of the series to true .

另請參閱 setVisible () 和 isVisible ().

內容

1. 公共類型

2. 特性

3. 公共函數

4. 信號

5. 詳細描述