QLogValue3DAxisFormatter Class

The QLogValue3DAxisFormatter class provides formatting rules for a logarithmic value axis. 更多...

头：	#include <QLogValue3DAxisFormatter>
qmake:	QT += datavisualization
Since:	QtDataVisualization 1.1
实例化：	LogValueAxis3DFormatter
继承：	QValue3DAxisFormatter

该类在 QtDataVisualization 1.1 引入。

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特性

• autoSubGrid : bool
• base : qreal
• showEdgeLabels : bool

公共函数

	QLogValue3DAxisFormatter (QObject * parent = nullptr)
virtual	~QLogValue3DAxisFormatter ()
bool	autoSubGrid () const
qreal	base () const
void	setAutoSubGrid (bool enabled )
void	setBase (qreal base )
void	setShowEdgeLabels (bool enabled )
bool	showEdgeLabels () const

信号

void	autoSubGridChanged (bool enabled )
void	baseChanged (qreal base )
void	showEdgeLabelsChanged (bool enabled )

详细描述

When a formatter is attached to a value axis, the axis range cannot include negative values or the zero.

另请参阅 QValue3DAxisFormatter .

特性文档编制

autoSubGrid : bool

This property holds whether sub-grid positions are generated automatically.

If this property value is set to true , the parent axis sub-segment count is ignored when calculating sub-grid line positions. The sub-grid positions are generated automatically according to the base property value. The number of sub-grid lines is set to the base value minus one, rounded down. This property is ignored when the base value is zero. Defaults to true .

访问函数：

bool	autoSubGrid () const
void	setAutoSubGrid (bool enabled )

通知程序信号：

void	autoSubGridChanged (bool enabled )

另请参阅 base and QValue3DAxis::subSegmentCount .

base : qreal

This property holds the base of the logarithm used to map axis values.

If the base is non-zero, the parent axis segment count will be ignored when the grid line and label positions are calculated. If you want the range to be divided into equal segments like a normal value axis, set this property value to zero.

The base has to be zero or a positive value and it cannot be equal to one. Defaults to ten.

访问函数：

qreal	base () const
void	setBase (qreal base )

通知程序信号：

void	baseChanged (qreal base )

另请参阅 QValue3DAxis::segmentCount .

showEdgeLabels : bool

This property holds whether the first and last label on the axis are visible.

当 base property value is non-zero, the whole axis range is often not equally divided into segments. The first and last segments are often smaller than the other segments. In extreme cases, this can lead to overlapping labels on the first and last two grid lines. By setting this property to false , you can suppress showing the minimum and maximum labels for the axis in cases where the segments do not exactly fit the axis. Defaults to true .

访问函数：

bool	showEdgeLabels () const
void	setShowEdgeLabels (bool enabled )

通知程序信号：

void	showEdgeLabelsChanged (bool enabled )

另请参阅 base and QAbstract3DAxis::labels .

成员函数文档编制

QLogValue3DAxisFormatter:: QLogValue3DAxisFormatter ( QObject * parent = nullptr)

Constructs a new logarithmic value 3D axis formatter with the optional parent parent .

[虚拟] QLogValue3DAxisFormatter:: ~QLogValue3DAxisFormatter ()

Deletes the logarithmic value 3D axis formatter.

内容

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