class QCategoryAxis#

The QCategoryAxis class places named ranges on the axis. More…

Synopsis#

Properties#

categoriesLabelsᅟ - Category labels as a string list
countᅟ - Number of categories
labelsPositionᅟ - 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
startValueᅟ - Low end of the first category on the axis

Signals#

def categoriesChanged()
def labelsPositionChanged()

Note

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Detailed Description#

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);

class AxisLabelsPosition#

This enum describes the position of the category labels.

Constant

Description

QCategoryAxis.AxisLabelsPositionCenter

Labels are centered to category.

QCategoryAxis.AxisLabelsPositionOnValue

Labels are positioned to the high end limit of the category.

Constant	Description
QCategoryAxis.AxisLabelsPositionCenter	Labels are centered to category.
QCategoryAxis.AxisLabelsPositionOnValue	Labels are positioned to the high end limit of the category.

Note

Properties can be used directly when from __feature__ import true_property is used or via accessor functions otherwise.

property categoriesLabelsᅟ: list of strings#

This property holds The category labels as a string list..

Access functions:

categoriesLabels()

property countᅟ: int#

This property holds The number of categories..

Access functions:

count()

property labelsPositionᅟ: QCategoryAxis.AxisLabelsPosition#

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:

labelsPosition()
setLabelsPosition()
Signal labelsPositionChanged()

property startValueᅟ: float#

This property holds The low end of the first category on the axis..

Access functions:

startValue()
setStartValue()

__init__([parent=None])#

Parameters:: parent – QObject

Constructs an axis object that is a child of parent.

append(label, categoryEndValue)#

Parameters:

label – str
categoryEndValue – float

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.

categoriesChanged()#

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

categoriesLabels()#

Return type:: list of strings

Returns the list of the categories’ labels.

Getter of property categoriesLabelsᅟ .

count()#

Return type:: int

Returns the number of categories.

Getter of property countᅟ .

endValue(categoryLabel)#

Parameters:: categoryLabel – str
Return type:: float

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

labelsPosition()#

Return type:: AxisLabelsPosition