QValueAxis 类

The QValueAxis class adds values to a graph's axes. 更多...

头：	#include <QValueAxis>
CMake:	find_package(Qt6 REQUIRED COMPONENTS Graphs) target_link_libraries(mytarget PRIVATE Qt6::Graphs)
qmake:	QT += graphs
在 QML：	ValueAxis
继承：	QAbstractAxis

• 所有成员列表，包括继承成员
• QValueAxis is part of Qt Graphs C++ Classes for 2D .

特性

labelDecimals : int labelFormat : QString max : qreal min : qreal

subTickCount : qsizetype tickAnchor : qreal tickInterval : qreal

公共函数

	QValueAxis (QObject * parent = nullptr)
virtual	~QValueAxis () override
int	labelDecimals () const
QString	labelFormat () const
qreal	max () const
qreal	min () const
void	setLabelDecimals (int decimals )
void	setLabelFormat (const QString & format )
void	setMax (qreal max )
void	setMin (qreal min )
void	setRange (qreal min , qreal max )
void	setSubTickCount (qsizetype count )
void	setTickAnchor (qreal anchor )
void	setTickInterval (qreal interval )
qsizetype	subTickCount () const
qreal	tickAnchor () const
qreal	tickInterval () const

重实现公共函数

virtual QAbstractAxis::AxisType

type () const override

信号

void	labelDecimalsChanged (int decimals )
void	labelFormatChanged (const QString & format )
void	maxChanged (qreal max )
void	minChanged (qreal min )
void	subTickCountChanged (qsizetype subTickCount )
void	tickAnchorChanged (qreal tickAnchor )
void	tickIntervalChanged (qreal tickInterval )

详细描述

A value axis can be set up to show an axis line with tick marks, grid lines, and shades. The values on the axis are drawn at the positions of tick marks.

特性文档编制

labelDecimals : int

This property holds the number of decimals used for showing the labels. When set to -1, decimal amount is adjusted automatically based on the values range. The default value is -1.

访问函数：

int	labelDecimals () const
void	setLabelDecimals (int decimals )

通知程序信号：

void	labelDecimalsChanged (int decimals )

labelFormat : QString

此特性保持轴的标签格式。

格式字符串支持的以下转换说明符、长度修饰符和标志的提供通过 printf() 在标准 C++ 库：d、i、o、x、X、f、F、e、E、g、G、c。

The default value is empty, in which case 'f' format is used.

访问函数：

QString	labelFormat () const
void	setLabelFormat (const QString & format )

通知程序信号：

void	labelFormatChanged (const QString & format )

另请参阅 QString::asprintf ().

max : qreal

此特性保持轴的最大值。

When setting this property, the minimum value is adjusted if necessary, to ensure that the range remains valid. The default value is 10.0

访问函数：

qreal	max () const
void	setMax (qreal max )

通知程序信号：

void	maxChanged (qreal max )

min : qreal

此特性保持轴的最小值。

When setting this property, the maximum value is adjusted if necessary, to ensure that the range remains valid. The default value is 0.0

访问函数：

qreal	min () const
void	setMin (qreal min )

通知程序信号：

void	minChanged (qreal min )

subTickCount : qsizetype

This property holds the number of subticks on the axis. This indicates how many subticks are drawn between major lines on the graph. Labels are not drawn for subticks. The default value is 0.

访问函数：

qsizetype	subTickCount () const
void	setSubTickCount (qsizetype count )

通知程序信号：

void	subTickCountChanged (qsizetype subTickCount )

tickAnchor : qreal

This property holds the base value where the dynamically placed tick marks and labels are started from. The default value is 0.

访问函数：

qreal	tickAnchor () const
void	setTickAnchor (qreal anchor )

通知程序信号：

void	tickAnchorChanged (qreal tickAnchor )

tickInterval : qreal

This property holds the interval between dynamically placed tick marks and labels. The default value is 0, which means that intervals are automatically calculated based on the min and max range.

访问函数：

qreal	tickInterval () const
void	setTickInterval (qreal interval )

通知程序信号：

void	tickIntervalChanged (qreal tickInterval )

成员函数文档编制

[explicit] QValueAxis:: QValueAxis ( QObject * parent = nullptr)

Constructs an axis object that is a child of parent .

[override virtual noexcept] QValueAxis:: ~QValueAxis ()

销毁对象。

void QValueAxis:: setRange ( qreal min , qreal max )

设置范围从 min to max 在轴。若 min 大于 max ，此函数返回不做任何改变。

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

重实现： QAbstractAxis::type () const.

返回轴的类型。

内容

1. 特性

2. 公共函数

3. 重实现公共函数

4. 信号

5. 详细描述