The QCategoryAxis class places named ranges on the axis. More...
| Header: | #include <QCategoryAxis> |
| Instantiated By: | CategoryAxis |
| Inherits: | QValueAxis |
| enum | AxisLabelsPosition { AxisLabelsPositionCenter, AxisLabelsPositionOnValue } |
| QCategoryAxis(QObject *parent = nullptr) | |
| virtual | ~QCategoryAxis() |
| void | append(const QString &categoryLabel, qreal categoryEndValue) |
| QStringList | categoriesLabels() |
| int | count() const |
| qreal | endValue(const QString &categoryLabel) const |
| QCategoryAxis::AxisLabelsPosition | labelsPosition() const |
| void | remove(const QString &categoryLabel) |
| void | replaceLabel(const QString &oldLabel, const QString &newLabel) |
| void | setLabelsPosition(QCategoryAxis::AxisLabelsPosition position) |
| void | setStartValue(qreal min) |
| qreal | startValue(const QString &categoryLabel = QString()) const |
| virtual QAbstractAxis::AxisType | type() const |
| void | categoriesChanged() |
| void | labelsPositionChanged(QCategoryAxis::AxisLabelsPosition position) |
The QCategoryAxis class places named ranges on the axis.
This class can be used to explain the underlying data by adding labeled categories. Unlike QBarCategoryAxis, QCategoryAxis allows the widths of the category ranges to be specified freely.
Example code on how to use QCategoryAxis:
QChartView *chartView = new QChartView; QLineSeries *series = new QLineSeries; // ... chartView->chart()->addSeries(series); QCategoryAxis *axisY = new QCategoryAxis; axisY->setMin(0); axisY->setMax(52); axisY->setStartValue(15); axisY->append("First", 20); axisY->append("Second", 37); axisY->append("Third", 52); chartView->chart()->setAxisY(axisY, series);
This enum describes the position of the category labels.
| Constant | Value | Description |
|---|---|---|
QCategoryAxis::AxisLabelsPositionCenter |
0x0 |
Labels are centered to category. |
QCategoryAxis::AxisLabelsPositionOnValue |
0x1 |
Labels are positioned to the high end limit of the category. |
This property holds the category labels as a string list.
Access functions:
| QStringList | categoriesLabels() |
This property holds the number of categories.
Access functions:
| int | count() const |
This property holds the position of the category labels. The labels in the beginning and in the end of the axes may overlap other axes' labels when positioned on value.
Access functions:
| QCategoryAxis::AxisLabelsPosition | labelsPosition() const |
| void | setLabelsPosition(QCategoryAxis::AxisLabelsPosition position) |
Notifier signal:
| void | labelsPositionChanged(QCategoryAxis::AxisLabelsPosition position) |
This property holds the low end of the first category on the axis.
Access functions:
| qreal | startValue(const QString &categoryLabel = QString()) const |
| void | setStartValue(qreal min) |
Constructs an axis object that is a child of parent.
[virtual] QCategoryAxis::~QCategoryAxis()Destroys the object.
Appends a new category to the axis with the label categoryLabel. A category label has to be unique. categoryEndValue specifies the high end limit of the category. It has to be greater than the high end limit of the previous category. Otherwise the method returns without adding a new category.
[signal] void QCategoryAxis::categoriesChanged()This signal is emitted when the categories of the axis change.
Returns the list of the categories' labels.
Note: Getter function for property categoriesLabels.
Returns the number of categories.
Note: Getter function for property count.
Returns the high end limit of the category specified by categoryLabel.
Removes a category specified by the label categoryLabel from the axis.
Replaces an existing category label specified by oldLabel with newLabel. If the old label does not exist, the method returns without making any changes.
Sets min to be the low end limit of the first category on the axis. If categories have already been added to the axis, the passed value must be less than the high end value of the already defined first category range. Otherwise nothing is done.
Note: Setter function for property startValue.
See also startValue().
Returns the low end limit of the category specified by categoryLabel.
Note: Getter function for property startValue.
See also setStartValue().
[virtual] QAbstractAxis::AxisType QCategoryAxis::type() constReimplemented from QValueAxis::type().
Returns the type of the axis.
