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
实例化: ValueAxis
继承: QAbstractAxis
状态: 技术预览

特性

公共函数

QValueAxis (QObject * parent = nullptr)
virtual ~QValueAxis ()
int labelDecimals () const
QString labelFormat () const
qreal max () const
qreal min () const
int minorTickCount () const
void setLabelDecimals (int decimals )
void setLabelFormat (const QString & format )
void setMax (qreal max )
void setMin (qreal min )
void setMinorTickCount (int count )
void setRange (qreal min , qreal max )
void setTickAnchor (qreal anchor )
void setTickInterval (qreal insterval )
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 minorTickCountChanged (int minorTickCount )
void rangeChanged (qreal min , qreal max )
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 )

minorTickCount : int

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

访问函数:

int minorTickCount () const
void setMinorTickCount (int count )

通知程序信号:

void minorTickCountChanged (int minorTickCount )

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 insterval )

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 .

[virtual noexcept] QValueAxis:: ~QValueAxis ()

销毁对象。

[signal] void QValueAxis:: labelDecimalsChanged ( int decimals )

此信号发射当 decimals amount of axis labels changes.

注意: 通知程序信号对于特性 labelDecimals .

[signal] void QValueAxis:: labelFormatChanged (const QString & format )

此信号发射当 format 对于轴标签改变。

注意: 通知程序信号对于特性 labelFormat .

[signal] void QValueAxis:: maxChanged ( qreal max )

This signal is emitted when the maximum value of the axis, specified by max ,改变。

注意: 通知程序信号对于特性 max .

[signal] void QValueAxis:: minChanged ( qreal min )

This signal is emitted when the minimum value of the axis, specified by min ,改变。

注意: 通知程序信号对于特性 min .

[signal] void QValueAxis:: minorTickCountChanged ( int minorTickCount )

This signal is emitted when the number of minor tick marks on the axis, specified by minorTickCount ,改变。

注意: 通知程序信号对于特性 minorTickCount .

[signal] void QValueAxis:: rangeChanged ( qreal min , qreal max )

This signal is emitted when the minimum or maximum value of the axis, specified by min and max ,改变。

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。

[signal] void QValueAxis:: tickAnchorChanged ( qreal tickAnchor )

This signal is emitted when the tick anchoring value, specified by tickAnchor ,改变。

注意: 通知程序信号对于特性 tickAnchor .

[signal] void QValueAxis:: tickIntervalChanged ( qreal tickInterval )

This signal is emitted when the tick interval value, specified by tickInterval ,改变。

注意: 通知程序信号对于特性 tickInterval .

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

重实现: QAbstractAxis::type() const .

返回轴的类型。