- Qt 6.7
- Qt Graphs
- C++ Classes
- QtGraphs (Technical Preview)
- QValueAxis
- Qt Graphs | Commercial or GPLv3

# QValueAxis Class

The QValueAxis class adds values to a graph's axes. More...

Header: | #include <QValueAxis>
CMake: | find_package(Qt6 REQUIRED COMPONENTS Graphs) target_link_libraries(mytarget PRIVATE Qt6::Graphs)
qmake: | QT += graphs
Instantiated By: | ValueAxis
Inherits: | QAbstractAxis
Status: | Technical Preview

- List of all members, including inherited members
- QValueAxis is part of Qt Graphs C++ Classes for 2D.

## Properties

labelDecimals : int labelFormat : QString max : qreal min : qreal | minorTickCount : int tickAnchor : qreal tickInterval : qreal

## Public Functions

| QValueAxis(QObject *parent = nullptr)
virtual | ~QValueAxis()
int | labelDecimals() const
QString | labelFormat() const
qreal | max() const
qreal | min() const
int | minorTickCount() const
void | setLabelDecimals(int decimals)
void | setLabelFormat(const QString &format)
void | setMax(qreal max)
void | setMin(qreal min)
void | setMinorTickCount(int count)
void | setRange(qreal min, qreal max)
void | setTickAnchor(qreal anchor)
void | setTickInterval(qreal insterval)
qreal | tickAnchor() const
qreal | tickInterval() const

## Reimplemented Public Functions

virtual QAbstractAxis::AxisType | type() const override

## Signals

void | labelDecimalsChanged(int decimals)
void | labelFormatChanged(const QString &format)
void | maxChanged(qreal max)
void | minChanged(qreal min)
void | minorTickCountChanged(int minorTickCount)
void | rangeChanged(qreal min, qreal max)
void | tickAnchorChanged(qreal tickAnchor)
void | tickIntervalChanged(qreal tickInterval)

## 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.

## Property Documentation

### labelDecimals : int

This property holds the number of decimals used for showing the labels. When set to -1, decimal amount is adjusted automatically based on the values range. The default value is -1.

Access functions:

int | labelDecimals() const
void | setLabelDecimals(int decimals)

Notifier signal:

void | labelDecimalsChanged(int decimals)

### labelFormat : QString

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.

The default value is empty, in which case 'f' format is used.

Access functions:

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

Notifier signal:

void | labelFormatChanged(const QString &format)

See also QString::asprintf().

### max : qreal

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. The default value is 10.0

Access functions:

qreal | max() const
void | setMax(qreal max)

Notifier signal:

void | maxChanged(qreal max)

### min : qreal

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. The default value is 0.0

Access functions:

qreal | min() const
void | setMin(qreal min)

Notifier signal:

void | minChanged(qreal min)

### minorTickCount : 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 graph. Labels are not drawn for minor ticks. The default value is 0.

Access functions:

int | minorTickCount() const
void | setMinorTickCount(int count)

Notifier signal:

void | minorTickCountChanged(int minorTickCount)

### tickAnchor : qreal

This property holds the base value where the dynamically placed tick marks and labels are started from. The default value is 0.

Access functions:

qreal | tickAnchor() const
void | setTickAnchor(qreal anchor)

Notifier signal:

void | tickAnchorChanged(qreal tickAnchor)

### tickInterval : qreal

This property holds the interval between dynamically placed tick marks and labels. The default value is 0, which means that intervals are automatically calculated based on the min and max range.

Access functions:

qreal | tickInterval() const
void | setTickInterval(qreal insterval)

Notifier signal:

void | tickIntervalChanged(qreal tickInterval)

## Member Function Documentation

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

Constructs an axis object that is a child of parent.

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

Destroys the object.

### `[signal]` void QValueAxis::labelDecimalsChanged(int decimals)

This signal is emitted when the decimals amount of axis labels changes.

Note: Notifier signal for property labelDecimals.

### `[signal]` void QValueAxis::labelFormatChanged(const QString &format)

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

Note: Notifier signal for property labelFormat.

### `[signal]` void QValueAxis::maxChanged(qreal max)

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

Note: Notifier signal for property max.

### `[signal]` void QValueAxis::minChanged(qreal min)

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

Note: Notifier signal for property min.

### `[signal]` void QValueAxis::minorTickCountChanged(int minorTickCount)

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

Note: Notifier signal for property minorTickCount.

### `[signal]` void QValueAxis::rangeChanged(qreal min, qreal max)

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

### void QValueAxis::setRange(qreal min, qreal max)

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

### `[signal]` void QValueAxis::tickAnchorChanged(qreal tickAnchor)

This signal is emitted when the tick anchoring value, specified by tickAnchor, changes.

Note: Notifier signal for property tickAnchor.

### `[signal]` void QValueAxis::tickIntervalChanged(qreal tickInterval)

This signal is emitted when the tick interval value, specified by tickInterval, changes.

Note: Notifier signal for property tickInterval.

### `[override virtual]` QAbstractAxis::AxisType QValueAxis::type() const

Reimplements: QAbstractAxis::type() const.

Returns the type of the axis.