QCategoryAxis 類

QCategoryAxis 類把命名範圍放置在軸上。 更多...

頭：	#include <QCategoryAxis>
實例化：	CategoryAxis
繼承：	QValueAxis

• 所有成員列錶，包括繼承成員

公共類型

enum	AxisLabelsPosition { AxisLabelsPositionCenter, AxisLabelsPositionOnValue }

特性

• categoriesLabels : const QStringList
• count : const int
• labelsPosition : AxisLabelsPosition
• startValue : qreal

公共函數

	QCategoryAxis (QObject * parent = nullptr)
virtual	~QCategoryAxis ()
void	append (const QString & categoryLabel , qreal categoryEndValue )
QStringList	categoriesLabels ()
int	count () const
qreal	endValue (const QString & categoryLabel ) const
QCategoryAxis::AxisLabelsPosition	labelsPosition () const
void	remove (const QString & categoryLabel )
void	replaceLabel (const QString & oldLabel , const QString & newLabel )
void	setLabelsPosition (QCategoryAxis::AxisLabelsPosition position )
void	setStartValue (qreal min )
qreal	startValue (const QString & categoryLabel = QString()) const

重實現公共函數

virtual QAbstractAxis::AxisType

type () const override

信號

void	categoriesChanged ()
void	labelsPositionChanged (QCategoryAxis::AxisLabelsPosition position )

詳細描述

This class can be used to explain the underlying data by adding labeled categories. Unlike QBarCategoryAxis , QCategoryAxis allows the widths of the category ranges to be specified freely.

Example code on how to use QCategoryAxis:

QChartView *chartView = new QChartView;
QLineSeries *series = new QLineSeries;
// ...
chartView->chart()->addSeries(series);
QCategoryAxis *axisY = new QCategoryAxis;
axisY->setMin(0);
axisY->setMax(52);
axisY->setStartValue(15);
axisY->append("First", 20);
axisY->append("Second", 37);
axisY->append("Third", 52);
chartView->chart()->setAxisY(axisY, series);
					

成員類型文檔編製

enum QCategoryAxis:: AxisLabelsPosition

此枚舉描述類彆標簽的位置。

常量	值	描述
QCategoryAxis::AxisLabelsPositionCenter	0x0	Labels are centered to category.
QCategoryAxis::AxisLabelsPositionOnValue	0x1	Labels are positioned to the high end limit of the category.

特性文檔編製

categoriesLabels : const QStringList

此特性以字符串列錶保持類彆標簽。

訪問函數：

QStringList

categoriesLabels ()

count : const int

此特性保持類彆數。

訪問函數：

int	count () const

labelsPosition : AxisLabelsPosition

This property holds the position of the category labels. The labels in the beginning and in the end of the axes may overlap other axes' labels when positioned on value.

訪問函數：

QCategoryAxis::AxisLabelsPosition	labelsPosition () const
void	setLabelsPosition (QCategoryAxis::AxisLabelsPosition position )

通知程序信號：

void	labelsPositionChanged (QCategoryAxis::AxisLabelsPosition position )

startValue : qreal

This property holds the low end of the first category on the axis.

訪問函數：

qreal	startValue (const QString & categoryLabel = QString()) const
void	setStartValue (qreal min )

成員函數文檔編製

QCategoryAxis:: QCategoryAxis ( QObject * parent = nullptr)

Constructs an axis object that is a child of parent .

[signal] void QCategoryAxis:: categoriesChanged ()

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

[虛擬] QCategoryAxis:: ~QCategoryAxis ()

銷毀對象。

void QCategoryAxis:: append (const QString & categoryLabel , qreal categoryEndValue )

Appends a new category to the axis with the label categoryLabel . A category label has to be unique. categoryEndValue specifies the high end limit of the category. It has to be greater than the high end limit of the previous category. Otherwise the method returns without adding a new category.

QStringList QCategoryAxis:: categoriesLabels ()

Returns the list of the categories' labels.

注意： Getter function for property categoriesLabels.

int QCategoryAxis:: count () const

Returns the number of categories.

注意： getter 函數對於特性 count。

qreal QCategoryAxis:: endValue (const QString & categoryLabel ) const

Returns the high end limit of the category specified by categoryLabel .

void QCategoryAxis:: remove (const QString & categoryLabel )

Removes a category specified by the label categoryLabel from the axis.

void QCategoryAxis:: replaceLabel (const QString & oldLabel , const QString & newLabel )

Replaces an existing category label specified by oldLabel with newLabel . If the old label does not exist, the method returns without making any changes.

void QCategoryAxis:: setStartValue ( qreal min )

設置 min to be the low end limit of the first category on the axis. If categories have already been added to the axis, the passed value must be less than the high end value of the already defined first category range. Otherwise nothing is done.

注意： setter 函數對於特性 startValue .

另請參閱 startValue ().

qreal QCategoryAxis:: startValue (const QString & categoryLabel = QString()) const

Returns the low end limit of the category specified by categoryLabel .

注意： Getter function for property startValue.

另請參閱 setStartValue ().

[override virtual] QAbstractAxis::AxisType QCategoryAxis:: type () const

重實現： QValueAxis::type () const.

返迴軸的類型。

內容

1. 公共類型

2. 特性

3. 公共函數

4. 重實現公共函數

5. 信號

6. 詳細描述