The QLogValueAxis class adds a logarithmic scale to a chart's axis. 更多...
| 頭: | #include <QLogValueAxis> |
| 實例化: | LogValueAxis |
| 繼承: | QAbstractAxis |
|
|
| QLogValueAxis (QObject * parent = nullptr) | |
| virtual | ~QLogValueAxis () |
| qreal | base () const |
| QString | labelFormat () const |
| qreal | max () const |
| qreal | min () const |
| int | minorTickCount () const |
| void | setBase (qreal base ) |
| void | setLabelFormat (const QString & format ) |
| void | setMax (qreal max ) |
| void | setMin (qreal min ) |
| void | setMinorTickCount (int minorTickCount ) |
| void | setRange (qreal min , qreal max ) |
| int | tickCount () const |
| virtual QAbstractAxis::AxisType | type () const |
| void | baseChanged (qreal base ) |
| void | labelFormatChanged (const QString & format ) |
| void | maxChanged (qreal max ) |
| void | minChanged (qreal min ) |
| void | minorTickCountChanged (int minorTickCount ) |
| void | rangeChanged (qreal min , qreal max ) |
| void | tickCountChanged (int tickCount ) |
| const QMetaObject | staticMetaObject |
The QLogValueAxis class adds a logarithmic scale to a chart's axis.
A logarithmic scale is a nonlinear scale that is based on orders of magnitude, so that each tick mark on the axis is the previous tick mark multiplied by a value.
注意: 若 QLogValueAxis is attached to a series with one or more points with negative or zero values on the associated dimension, the series will not be plotted at all. This is particularly relevant when XYModelMappers are used, since empty cells in models typically contain zero values.
This property holds the base of the logarithm.
The value has to be greater than 0 and cannot equal 1.
訪問函數:
| qreal | base () const |
| void | setBase (qreal base ) |
通知程序信號:
| void | baseChanged (qreal base ) |
此特性保持軸的標簽格式。
格式字符串支持的以下轉換說明符、長度修飾符和標誌的提供通過
printf()
在標準 C++ 庫:d、i、o、x、X、f、F、e、E、g、G、c。
若
QChart::localizeNumbers
is
true
,支持的說明符限於:d、e、E、f、g、G 和 i。另外,僅支持精度修飾符。其餘格式來自默認
QLocale
對於應用程序。
訪問函數:
| QString | labelFormat () const |
| void | setLabelFormat (const QString & format ) |
通知程序信號:
| void | labelFormatChanged (const QString & format ) |
另請參閱 QString::asprintf ().
此特性保持軸的最大值。
When setting this property, the minimum value is adjusted if necessary, to ensure that the range remains valid. The value has to be greater than 0.
訪問函數:
| qreal | max () const |
| void | setMax (qreal max ) |
通知程序信號:
| void | maxChanged (qreal max ) |
此特性保持軸的最小值。
When setting this property, the maximum value is adjusted if necessary, to ensure that the range remains valid. The value has to be greater than 0.
訪問函數:
| qreal | min () const |
| void | setMin (qreal min ) |
通知程序信號:
| void | minChanged (qreal min ) |
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 chart. Labels are not drawn for minor ticks. The default value is 0. Set the value to -1 and the number of grid lines between major ticks will be calculated automatically.
訪問函數:
| int | minorTickCount () const |
| void | setMinorTickCount (int minorTickCount ) |
通知程序信號:
| void | minorTickCountChanged (int minorTickCount ) |
This property holds the number of tick marks on the axis. This indicates how many grid lines are drawn on the chart. This value is read-only.
訪問函數:
| int | tickCount () const |
通知程序信號:
| void | tickCountChanged (int tickCount ) |
Constructs an axis object that is a child of parent .
[虛擬]
QLogValueAxis::
~QLogValueAxis
()
銷毀對象。
[signal]
void
QLogValueAxis::
baseChanged
(
qreal
base
)
此信號發射,當 base of the logarithm of the axis changes.
注意: 通知程序信號對於特性 base .
[signal]
void
QLogValueAxis::
labelFormatChanged
(const
QString
&
format
)
此信號發射,當 format 對於軸標簽改變。
注意: 通知程序信號對於特性 labelFormat .
[signal]
void
QLogValueAxis::
maxChanged
(
qreal
max
)
This signal is emitted when the maximum value of the axis, specified by max ,改變。
注意: 通知程序信號對於特性 max .
[signal]
void
QLogValueAxis::
minChanged
(
qreal
min
)
This signal is emitted when the minimum value of the axis, specified by min ,改變。
注意: 通知程序信號對於特性 min .
[signal]
void
QLogValueAxis::
minorTickCountChanged
(
int
minorTickCount
)
This signal is emitted when the number of minor tick marks on the axis, specified by minorTickCount ,改變。
注意: 通知程序信號對於特性 minorTickCount .
[signal]
void
QLogValueAxis::
rangeChanged
(
qreal
min
,
qreal
max
)
This signal is emitted when the minimum or maximum value of the axis, specified by min and max ,改變。
設置範圍從 min to max 在軸。若 min 大於 max ,此函數返迴不做任何改變。
[signal]
void
QLogValueAxis::
tickCountChanged
(
int
tickCount
)
This signal is emitted when the number of tick marks on the axis, specified by tickCount ,改變。
注意: 通知程序信號對於特性 tickCount .
[虛擬]
QAbstractAxis::AxisType
QLogValueAxis::
type
() const
重實現自 QAbstractAxis::type ().
返迴軸的類型。