- Qt 6.8
- Qt Graphs
- C++ Classes
- QtGraphs
- QValue3DAxis
- Qt Graphs | Commercial or GPLv3

# QValue3DAxis Class

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

Header: | `#include <QValue3DAxis>`
CMake: | `find_package(Qt6 REQUIRED COMPONENTS Graphs)` `target_link_libraries(mytarget PRIVATE Qt6::Graphs)`
qmake: | `QT += graphs`
In QML: | Value3DAxis
Inherits: | QAbstract3DAxis

- List of all members, including inherited members
- QValue3DAxis is part of Qt Graphs C++ Classes for 3D.

## Properties

formatter : QValue3DAxisFormatter* labelFormat : QString reversed : bool | segmentCount : qsizetype subSegmentCount : qsizetype

## Public Functions

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

## Signals

void | formatterChanged(QValue3DAxisFormatter *formatter)
void | labelFormatChanged(const QString &format)
void | reversedChanged(bool enable)
void | segmentCountChanged(qsizetype count)
void | subSegmentCountChanged(qsizetype 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, and 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 maximum values of the range, as there is always at least one segment.

## Property Documentation

### formatter : QValue3DAxisFormatter*

This property holds the axis formatter to be used.

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

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 Q3DGraphsWidgetItem::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 Q3DGraphsWidgetItem::locale.

### reversed : bool

This property holds whether the axis is rendered in reverse.

If `true`, the axis will be rendered in reverse, which means 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.

Access functions:

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

Notifier signal:

void | reversedChanged(bool enable)

### segmentCount : qsizetype

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:

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

Notifier signal:

void | segmentCountChanged(qsizetype count)

See also setSubSegmentCount().

### subSegmentCount : qsizetype

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:

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

Notifier signal:

void | subSegmentCountChanged(qsizetype count)

See also setSegmentCount().

## Member Function Documentation

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

Constructs QValue3DAxis with the given parent.

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

Destroys QValue3DAxis.