class QValueAxis#

The QValueAxis class adds values to a chart’s axes. More…

Inheritance diagram of PySide6.QtGraphs.QValueAxis

Inherited by: QCategoryAxis

Synopsis#

Properties#

  • labelFormatᅟ - Label format of the axis

  • maxᅟ - Maximum value on the axis

  • minᅟ - Minimum value on the axis

  • minorTickCountᅟ - 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

  • tickAnchorᅟ - Base value where the dynamically placed tick marks and labels are started from

  • tickCountᅟ - Number of tick marks on the axis. This indicates how many grid lines are drawn on the chart. The default value is 5, and the number cannot be less than 2

  • tickIntervalᅟ - Interval between dynamically placed tick marks and labels

  • tickTypeᅟ - Positioning method of tick and labels

Methods#

Slots#

Signals#

Note

This documentation may contain snippets that were automatically translated from C++ to Python. We always welcome contributions to the snippet translation. If you see an issue with the translation, you can also let us know by creating a ticket on https:/bugreports.qt.io/projects/PYSIDE

Detailed Description#

A value axis can be set up to show an axis line with tick marks, grid lines, and shades. The values on the axis are drawn at the positions of tick marks.

The following example code illustrates how to use the QValueAxis class:

QChartView *chartView = new QChartView;
QLineSeries *series = new QLineSeries;
// ...
chartView->chart()->addSeries(series);

QValueAxis *axisX = new QValueAxis;
axisX->setRange(10, 20.5);
axisX->setTickCount(10);
axisX->setLabelFormat("%.2f");
chartView->chart()->setAxisX(axisX, series);
class TickType#

This enum describes how the ticks and labels are positioned on the axis.

Constant

Description

QValueAxis.TicksDynamic

Ticks are placed according to tickAnchor and tickInterval values.

QValueAxis.TicksFixed

Ticks are placed evenly across the axis range. The tickCount value specifies the number of ticks.

Note

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

property labelFormatᅟ: str#

This property holds The label format of the axis..

The format string supports the following conversion specifiers, length modifiers, and flags provided by printf() in the standard C++ library: d, i, o, x, X, f, F, e, E, g, G, c.

If localizeNumbers is true, the supported specifiers are limited to: d, e, E, f, g, G, and i. Also, only the precision modifier is supported. The rest of the formatting comes from the default QLocale of the application.

See also

asprintf()

Access functions:
property maxᅟ: float#

This property holds The maximum value on the axis..

When setting this property, the minimum value is adjusted if necessary, to ensure that the range remains valid.

Access functions:
property minᅟ: float#

This property holds The minimum value on the axis..

When setting this property, the maximum value is adjusted if necessary, to ensure that the range remains valid.

Access functions:
property minorTickCountᅟ: int#

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..

Access functions:
property tickAnchorᅟ: float#

This property holds The base value where the dynamically placed tick marks and labels are started from..

Access functions:
property tickCountᅟ: int#

This property holds The number of tick marks on the axis. This indicates how many grid lines are drawn on the chart. The default value is 5, and the number cannot be less than 2..

Access functions:
property tickIntervalᅟ: float#

This property holds The interval between dynamically placed tick marks and labels..

Access functions:
property tickTypeᅟ: QValueAxis.TickType#

This property holds The positioning method of tick and labels..

Access functions:
__init__([parent=None])#
Parameters:

parent – QObject

Constructs an axis object that is a child of parent.

applyNiceNumbers()#

Modifies the current range and number of tick marks on the axis to look nice. The algorithm considers numbers that can be expressed as a form of 1*10^n, 2* 10^n, or 5*10^n to be nice numbers. These numbers are used for setting spacing for the tick marks.

labelFormat()#
Return type:

str

See also

setLabelFormat()

Getter of property labelFormatᅟ .

labelFormatChanged(format)#
Parameters:

format – str

This signal is emitted when the format of axis labels changes.

Notification signal of property labelFormatᅟ .

max()#
Return type:

float

See also

setMax()

Getter of property maxᅟ .

maxChanged(max)#
Parameters:

max – float

This signal is emitted when the maximum value of the axis, specified by max, changes.

Notification signal of property maxᅟ .

min()#
Return type:

float

See also

setMin()

Getter of property minᅟ .

minChanged(min)#
Parameters:

min – float

This signal is emitted when the minimum value of the axis, specified by min, changes.

Notification signal of property minᅟ .

minorTickCount()#
Return type:

int

See also

setMinorTickCount()

Getter of property minorTickCountᅟ .

minorTickCountChanged(tickCount)#
Parameters:

tickCount – int

This signal is emitted when the number of minor tick marks on the axis, specified by minorTickCount, changes.

Notification signal of property minorTickCountᅟ .

rangeChanged(min, max)#
Parameters:

  • min – float

  • max – float

This signal is emitted when the minimum or maximum value of the axis, specified by min and max, changes.

setLabelFormat(format)#
Parameters:

format – str

See also

labelFormat()

Setter of property labelFormatᅟ .

setMax(max)#
Parameters:

max – float

See also

max()

Setter of property maxᅟ .

setMin(min)#
Parameters:

min – float

See also

min()

Setter of property minᅟ .

setMinorTickCount(count)#
Parameters:

count – int

See also

minorTickCount()

Setter of property minorTickCountᅟ .

setRange(min, max)#
Parameters:

  • min – float

  • max – float

Sets the range from min to max on the axis. If min is greater than max, this function returns without making any changes.

setTickAnchor(anchor)#
Parameters:

anchor – float

See also

tickAnchor()

Setter of property tickAnchorᅟ .

setTickCount(count)#
Parameters:

count – int

See also

tickCount()

Setter of property tickCountᅟ .

setTickInterval(insterval)#
Parameters:

insterval – float

See also

tickInterval()

Setter of property tickIntervalᅟ .

setTickType(type)#
Parameters:

type – TickType

See also

tickType()

Setter of property tickTypeᅟ .

tickAnchor()#
Return type:

float

See also

setTickAnchor()

Getter of property tickAnchorᅟ .

tickAnchorChanged(anchor)#
Parameters:

anchor – float

Notification signal of property tickAnchorᅟ .

tickCount()#
Return type:

int

See also

setTickCount()

Getter of property tickCountᅟ .

tickCountChanged(tickCount)#
Parameters:

tickCount – int

This signal is emitted when the number of tick marks on the axis, specified by tickCount, changes.

Notification signal of property tickCountᅟ .

tickInterval()#
Return type:

float

See also

setTickInterval()

Getter of property tickIntervalᅟ .

tickIntervalChanged(interval)#
Parameters:

interval – float

Notification signal of property tickIntervalᅟ .

tickType()#
Return type:

TickType

See also

setTickType()

Getter of property tickTypeᅟ .

tickTypeChanged(type)#
Parameters:

type – TickType

Notification signal of property tickTypeᅟ .