The QBarCategoryAxis class adds categories to a chart's axes. 更多...
头: | #include <QBarCategoryAxis> |
实例化: | BarCategoryAxis |
继承: | QAbstractAxis |
QBarCategoryAxis (QObject * parent = nullptr) | |
virtual | ~QBarCategoryAxis () |
void | append (const QStringList & categories ) |
void | append (const QString & category ) |
QString | at (int index ) const |
QStringList | categories () |
void | clear () |
int | count () const |
void | insert (int index , const QString & category ) |
QString | max () const |
QString | min () const |
void | remove (const QString & category ) |
void | replace (const QString & oldCategory , const QString & newCategory ) |
void | setCategories (const QStringList & categories ) |
void | setMax (const QString & max ) |
void | setMin (const QString & min ) |
void | setRange (const QString & minCategory , const QString & maxCategory ) |
virtual QAbstractAxis::AxisType | type () const override |
void | categoriesChanged () |
void | countChanged () |
void | maxChanged (const QString & max ) |
void | minChanged (const QString & min ) |
void | rangeChanged (const QString & min , const QString & max ) |
QBarCategoryAxis can be set up to show an axis line with tick marks, grid lines, and shades. Categories are drawn between the ticks. It can be used also with a line series, as demonstrated by the 线和条形图范例 .
The following code illustrates how to use QBarCategoryAxis:
QChartView *chartView = new QChartView; QBarSeries *series = new QBarSeries; // ... chartView->chart()->addSeries(series); chartView->chart()->createDefaultAxes(); QBarCategoryAxis *axisX = new QBarCategoryAxis; QStringList categories; categories << "Jan" << "Feb" << "Mar" << "Apr" << "May" << "Jun"; axisX->append(categories); axisX->setRange("Feb", "May"); chartView->chart()->setAxisX(axisX, series);
This property holds the categories of an axis.
访问函数:
QStringList | categories () |
void | setCategories (const QStringList & categories ) |
通知程序信号:
void | categoriesChanged () |
This property holds the number of categories of an axis.
访问函数:
int | count () const |
通知程序信号:
void | countChanged () |
此特性保持轴的最大值。
访问函数:
QString | max () const |
void | setMax (const QString & max ) |
通知程序信号:
void | maxChanged (const QString & max ) |
此特性保持轴的最小值。
访问函数:
QString | min () const |
void | setMin (const QString & min ) |
通知程序信号:
void | minChanged (const QString & min ) |
Constructs an axis object that is the child of parent .
[signal]
void
QBarCategoryAxis::
categoriesChanged
()
This signal is emitted when the categories of the axis change.
注意: 通知程序信号对于特性 categories .
[signal]
void
QBarCategoryAxis::
countChanged
()
This signal is emitted when the number of categories of an axis changes.
注意: 通知程序信号对于特性 count .
[signal]
void
QBarCategoryAxis::
maxChanged
(const
QString
&
max
)
此信号发射当 max value of the axis changes.
注意: 通知程序信号对于特性 max .
[signal]
void
QBarCategoryAxis::
minChanged
(const
QString
&
min
)
此信号发射当 min value of the axis changes.
注意: 通知程序信号对于特性 min .
[signal]
void
QBarCategoryAxis::
rangeChanged
(const
QString
&
min
, const
QString
&
max
)
此信号发射当 min or max value of the axis changes.
[虚拟]
QBarCategoryAxis::
~QBarCategoryAxis
()
Destroys the axis object.
追加 categories to an axis. The maximum value on the axis will be changed to match the last category in categories . If no categories were previously defined, the minimum value on the axis will also be changed to match the first category in categories .
A category has to be a valid QString and it cannot be duplicated. Duplicated categories will not be appended.
追加 category to an axis. The maximum value on the axis will be changed to match the last category . If no categories were previously defined, the minimum value on the axis will also be changed to match category .
A category has to be a valid QString and it cannot be duplicated. Duplicated categories will not be appended.
Returns the category at index . The index must be valid.
Returns categories.
注意: Getter function for property categories.
另请参阅 setCategories ().
Removes all categories. Sets the maximum and minimum values of the axis range to QString::null.
注意: 此函数可以被援引,通过元对象系统和从 QML。见 Q_INVOKABLE .
Returns the number of categories.
注意: getter 函数对于特性 count。
插入 category to the axis at index . category has to be a valid QString and it cannot be duplicated. If category is prepended or appended to other categories, the minimum and maximum values on the axis are updated accordingly.
Returns the maximum category.
注意: Getter function for property max.
另请参阅 setMax ().
Returns the minimum category.
注意: Getter function for property min.
另请参阅 setMin ().
移除 category from the axis. Removing a category that currently sets the maximum or minimum value on the axis will affect the axis range.
替换 oldCategory with newCategory 。若 oldCategory does not exist on the axis, nothing is done. newCategory has to be a valid QString and it cannot be duplicated. If the minimum or maximum category is replaced, the minimum and maximum values on the axis are updated accordingly.
设置 categories and discards the old ones. The axis range is adjusted to match the first and last category in categories .
A category has to be a valid QString and it cannot be duplicated.
注意: setter 函数对于特性 categories .
另请参阅 categories ().
Sets the maximum category to max .
注意: setter 函数对于特性 max .
另请参阅 max ().
Sets the minimum category to min .
注意: setter 函数对于特性 min .
另请参阅 min ().
Sets the axis range from minCategory to maxCategory .
[override virtual]
QAbstractAxis::AxisType
QBarCategoryAxis::
type
() const
重实现: QAbstractAxis::type () const.
返回轴的类型。