- Qt 6.11
- Qt Data Visualization
- C++ Classes
- QValue3DAxis
- Qt Data Visualization | Commercial or GPLv3

# QValue3DAxis Class

The QValue3DAxis class manipulates an axis of a graph. More...

Header: | `#include <QValue3DAxis>`
CMake: | `find_package(Qt6 REQUIRED COMPONENTS DataVisualization)` `target_link_libraries(mytarget PRIVATE Qt6::DataVisualization)`
qmake: | `QT += datavisualization`
Since: | QtDataVisualization 1.0
In QML: | ValueAxis3D
Inherits: | QAbstract3DAxis

- List of all members, including inherited members

## Properties

`(since QtDataVisualization 1.1)` formatter : QValue3DAxisFormatter* labelFormat : QString `(since QtDataVisualization 1.1)` reversed : bool | segmentCount : int subSegmentCount : int

## Public Functions

| QValue3DAxis(QObject *parent = nullptr)
virtual | ~QValue3DAxis()
QValue3DAxisFormatter * | formatter() const
QString | labelFormat() const
bool | reversed() const
int | segmentCount() const
void | setFormatter(QValue3DAxisFormatter *formatter)
void | setLabelFormat(const QString &format)
void | setReversed(bool enable)
void | setSegmentCount(int count)
void | setSubSegmentCount(int count)
int | subSegmentCount() const

## Signals

void | formatterChanged(QValue3DAxisFormatter *formatter)
void | labelFormatChanged(const QString &format)
void | reversedChanged(bool enable)
void | segmentCountChanged(int count)
void | subSegmentCountChanged(int count)

## Detailed Description

A value axis can be given a range of values and segment and subsegment counts to divide the range into.

Labels are drawn between each segment. Grid lines are drawn between each segment and each subsegment.

Note: If visible, there will always be at least two grid lines and labels indicating the minimum and the maximum values of the range, as there is always at least one segment.

## Property Documentation

### `[since QtDataVisualization 1.1]` formatter : QValue3DAxisFormatter*

This property holds the axis formatter to be used.

Any existing formatter is deleted when a new formatter is set.

This property was introduced in QtDataVisualization 1.1.

Access functions:

QValue3DAxisFormatter * | formatter() const
void | setFormatter(QValue3DAxisFormatter *formatter)

Notifier signal:

void | formatterChanged(QValue3DAxisFormatter *formatter)

### labelFormat : QString

This property holds the label format to be used for the labels on this 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 QAbstract3DGraph::locale is anything else than `"C"`, 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.

Usage example:

`axis->setLabelFormat("%.2f mm");`

Access functions:

QString | labelFormat() const
void | setLabelFormat(const QString &format)

Notifier signal:

void | labelFormatChanged(const QString &format)

See also formatter and QAbstract3DGraph::locale.

### `[since QtDataVisualization 1.1]` reversed : bool

This property holds whether the axis is rendered in reverse.

If `true`, the axis will be rendered in reverse, i.e. the positions of minimum and maximum values are swapped when the graph is rendered. This property doesn't affect the actual minimum and maximum values of the axis.

This property was introduced in QtDataVisualization 1.1.

Access functions:

bool | reversed() const
void | setReversed(bool enable)

Notifier signal:

void | reversedChanged(bool enable)

### segmentCount : int

This property holds the number of segments on the axis.

This indicates how many labels are drawn. The number of grid lines to be drawn is calculated with formula: `segments * subsegments + 1`. The preset default is `5`. The value cannot be below `1`.

Access functions:

int | segmentCount() const
void | setSegmentCount(int count)

Notifier signal:

void | segmentCountChanged(int count)

See also setSubSegmentCount().

### subSegmentCount : int

This property holds the number of subsegments inside each segment on the axis.

Grid lines are drawn between each subsegment, in addition to each segment. The preset default is `1`. The value cannot be below `1`.

Access functions:

int | subSegmentCount() const
void | setSubSegmentCount(int count)

Notifier signal:

void | subSegmentCountChanged(int count)

See also setSegmentCount().

## Member Function Documentation

### `[explicit]` QValue3DAxis::QValue3DAxis(QObject *parent = nullptr)

Constructs QValue3DAxis with the given parent.

### `[virtual noexcept]` QValue3DAxis::~QValue3DAxis()

Destroys QValue3DAxis.