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);

Member Function Documentation

QCategoryAxis::QCategoryAxis(QObject *parent = nullptr)

Constructs an axis object that is a child of parent.

[signal] void QCategoryAxis::categoriesChanged()

This signal is emitted when the categories of the axis change.

[virtual] QCategoryAxis::~QCategoryAxis()

Destroys the object.

void QCategoryAxis::append(const QString &categoryLabel, qreal categoryEndValue)

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.

QStringList QCategoryAxis::categoriesLabels()

Returns the list of the categories' labels.

Note: Getter function for property categoriesLabels.

int QCategoryAxis::count() const

Returns the number of categories.

Note: Getter function for property count.

qreal QCategoryAxis::endValue(const QString &categoryLabel) const

Returns the high end limit of the category specified by categoryLabel.

void QCategoryAxis::remove(const QString &categoryLabel)

Removes a category specified by the label categoryLabel from the axis.

void QCategoryAxis::replaceLabel(const QString &oldLabel, const QString &newLabel)

Replaces an existing category label specified by oldLabel with newLabel. If the old label does not exist, the method returns without making any changes.

void QCategoryAxis::setStartValue(qreal min)

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().

qreal QCategoryAxis::startValue(const QString &categoryLabel = QString()) const

Returns the low end limit of the category specified by categoryLabel.

Note: Getter function for property startValue.

See also setStartValue().

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

Reimplements: QValueAxis::type() const.

Returns the type of the axis.