内容

• 特性
• 公共函数
• 重实现公共函数
• 信号
• 静态公共成员
• 详细描述

QBarCategoryAxis 类

The QBarCategoryAxis 类将类别添加到图表轴。 更多...

头：	#include <QBarCategoryAxis>
实例化：	BarCategoryAxis
继承：	QAbstractAxis

• 所有成员列表，包括继承成员
• 过时成员

特性

• categories : QStringList
• count : const int
• max : QString
• min : QString

• 27 特性继承自 QAbstractAxis
• 1 特性继承自 QObject

公共函数

	QBarCategoryAxis (QObject * parent = nullptr)
virtual	~QBarCategoryAxis ()
void	append (const QStringList & categories )
void	append (const QString & category )
QString	at (int index ) const
QStringList	categories ()
void	clear ()
int	count () const
void	insert (int index , const QString & category )
QString	max () const
QString	min () const
void	remove (const QString & category )
void	replace (const QString & oldCategory , const QString & newCategory )
void	setCategories (const QStringList & categories )
void	setMax (const QString & max )
void	setMin (const QString & min )
void	setRange (const QString & minCategory , const QString & maxCategory )

重实现公共函数

virtual QAbstractAxis::AxisType

type () const

• 58 公共函数继承自 QAbstractAxis
• 31 公共函数继承自 QObject

信号

void	categoriesChanged ()
void	countChanged ()
void	maxChanged (const QString & max )
void	minChanged (const QString & min )
void	rangeChanged (const QString & min , const QString & max )

• 25 信号继承自 QAbstractAxis
• 2 信号继承自 QObject

静态公共成员

const QMetaObject

staticMetaObject

• 9 静态公共成员继承自 QObject

额外继承成员

• 1 公共槽继承自 QObject
• 9 保护函数继承自 QObject

详细描述

The QBarCategoryAxis 类将类别添加到图表轴。

QBarCategoryAxis can be set up to show an axis line with tick marks, grid lines, and shades. Categories are drawn between the ticks. It can be used also with a line series, as demonstrated by the 线和条形图范例 .

The following code illustrates how to use QBarCategoryAxis :

QChartView *chartView = new QChartView;
QBarSeries *series = new QBarSeries;
// ...
chartView->chart()->addSeries(series);
chartView->chart()->createDefaultAxes();
QBarCategoryAxis *axisX = new QBarCategoryAxis;
QStringList categories;
categories << "Jan" << "Feb" << "Mar" << "Apr" << "May" << "Jun";
axisX->append(categories);
axisX->setRange("Feb", "May");
chartView->chart()->setAxisX(axisX, series);
					

特性文档编制

categories : QStringList

This property holds the categories of an axis.

访问函数：

QStringList	categories ()
void	setCategories (const QStringList & categories )

通知程序信号：

void	categoriesChanged ()

count : const int

This property holds the number of categories of an axis.

访问函数：

int	count () const

通知程序信号：

void	countChanged ()

max : QString

此特性保持轴的最大值。

访问函数：

QString	max () const
void	setMax (const QString & max )

通知程序信号：

void	maxChanged (const QString & max )

min : QString

此特性保持轴的最小值。

访问函数：

QString	min () const
void	setMin (const QString & min )

通知程序信号：

void	minChanged (const QString & min )

成员函数文档编制

QBarCategoryAxis:: QBarCategoryAxis ( QObject * parent = nullptr)

Constructs an axis object that is the child of parent .

[虚拟] QBarCategoryAxis:: ~QBarCategoryAxis ()

Destroys the axis object.

void QBarCategoryAxis:: append (const QStringList & categories )

追加 categories to an axis. The maximum value on the axis will be changed to match the last category in categories . If no categories were previously defined, the minimum value on the axis will also be changed to match the first category in categories .

A category has to be a valid QString and it cannot be duplicated. Duplicated categories will not be appended.

void QBarCategoryAxis:: append (const QString & category )

追加 category to an axis. The maximum value on the axis will be changed to match the last category . If no categories were previously defined, the minimum value on the axis will also be changed to match category .

A category has to be a valid QString and it cannot be duplicated. Duplicated categories will not be appended.

QString QBarCategoryAxis:: at ( int index ) const

Returns the category at index . The index must be valid.

QStringList QBarCategoryAxis:: categories ()

Returns categories.

注意： getter 函数对于特性 categories .

另请参阅 setCategories ().

[signal] void QBarCategoryAxis:: categoriesChanged ()

This signal is emitted when the categories of the axis change.

注意： 通知程序信号对于特性 categories .

void QBarCategoryAxis:: clear ()

Removes all categories. Sets the maximum and minimum values of the axis range to QString::null .

注意： 此函数可以被援引，通过元对象系统和从 QML。见 Q_INVOKABLE .

int QBarCategoryAxis:: count () const

Returns the number of categories.

注意： getter 函数对于特性 count .

[signal] void QBarCategoryAxis:: countChanged ()

This signal is emitted when the number of categories of an axis changes.

注意： 通知程序信号对于特性 count .

void QBarCategoryAxis:: insert ( int index , const QString & category )

插入 category to the axis at index . category has to be a valid QString and it cannot be duplicated. If category is prepended or appended to other categories, the minimum and maximum values on the axis are updated accordingly.

QString QBarCategoryAxis:: max () const

Returns the maximum category.

注意： getter 函数对于特性 max .

另请参阅 setMax ().

[signal] void QBarCategoryAxis:: maxChanged (const QString & max )

此信号发射当 max value of the axis changes.

注意： 通知程序信号对于特性 max .

QString QBarCategoryAxis:: min () const

Returns the minimum category.

注意： getter 函数对于特性 min .

另请参阅 setMin ().

[signal] void QBarCategoryAxis:: minChanged (const QString & min )

此信号发射当 min value of the axis changes.

注意： 通知程序信号对于特性 min .

[signal] void QBarCategoryAxis:: rangeChanged (const QString & min , const QString & max )

此信号发射当 min or max value of the axis changes.

void QBarCategoryAxis:: remove (const QString & category )

移除 category from the axis. Removing a category that currently sets the maximum or minimum value on the axis will affect the axis range.

void QBarCategoryAxis:: replace (const QString & oldCategory , const QString & newCategory )

替换 oldCategory with newCategory 。若 oldCategory does not exist on the axis, nothing is done. newCategory has to be a valid QString and it cannot be duplicated. If the minimum or maximum category is replaced, the minimum and maximum values on the axis are updated accordingly.

void QBarCategoryAxis:: setCategories (const QStringList & categories )

集 categories and discards the old ones. The axis range is adjusted to match the first and last category in categories .

A category has to be a valid QString and it cannot be duplicated.

注意： setter 函数对于特性 categories .

另请参阅 categories ().

void QBarCategoryAxis:: setMax (const QString & max )

Sets the maximum category to max .

注意： setter 函数对于特性 max .

另请参阅 max ().

void QBarCategoryAxis:: setMin (const QString & min )

Sets the minimum category to min .

注意： setter 函数对于特性 min .

另请参阅 min ().

void QBarCategoryAxis:: setRange (const QString & minCategory , const QString & maxCategory )

Sets the axis range from minCategory to maxCategory .

[虚拟] QAbstractAxis::AxisType QBarCategoryAxis:: type () const

重实现自 QAbstractAxis::type ().

返回轴的类型。