- Qt 6.9
- Qt Graphs
- C++ Classes
- QtGraphs
- QAbstractAxis
- Qt Graphs | Commercial or GPLv3

# QAbstractAxis Class

The QAbstractAxis class is a base class used for specialized axis classes. More...

Header: | `#include <QAbstractAxis>`
CMake: | `find_package(Qt6 REQUIRED COMPONENTS Graphs)` `target_link_libraries(mytarget PRIVATE Qt6::Graphs)`
qmake: | `QT += graphs`
In QML: | AbstractAxis
Inherited By: | QBarCategoryAxis, QDateTimeAxis, and QValueAxis

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

## Public Types

enum class | AxisType { Value, BarCategory, DateTime }

## Properties

- `(since 6.9)` alignment : Qt::Alignment
- gridVisible : bool
- labelDelegate : QQmlComponent*
- labelsAngle : qreal
- labelsVisible : bool
- lineVisible : bool

- subGridVisible : bool
- titleColor : QColor
- titleFont : QFont
- titleText : QString
- titleVisible : bool
- visible : bool

## Public Functions

virtual | ~QAbstractAxis() override
Qt::Alignment | alignment() const
void | hide()
bool | isGridVisible() const
bool | isLineVisible() const
bool | isSubGridVisible() const
bool | isTitleVisible() const
bool | isVisible() const
QQmlComponent * | labelDelegate() const
qreal | labelsAngle() const
bool | labelsVisible() const
void | setAlignment(Qt::Alignment alignment)
void | setGridVisible(bool visible = true)
void | setLabelDelegate(QQmlComponent *newLabelDelegate)
void | setLabelsAngle(qreal angle)
void | setLabelsVisible(bool visible = true)
void | setLineVisible(bool visible = true)
void | setMax(const QVariant &max)
void | setMin(const QVariant &min)
void | setRange(const QVariant &min, const QVariant &max)
void | setSubGridVisible(bool visible = true)
void | setTitleColor(QColor color)
void | setTitleFont(const QFont &font)
void | setTitleText(const QString &title)
void | setTitleVisible(bool visible = true)
void | setVisible(bool visible = true)
void | show()
QColor | titleColor() const
QFont | titleFont() const
QString | titleText() const
virtual QAbstractAxis::AxisType | type() const = 0

## Signals

void | alignmentChanged(Qt::Alignment alignment)
void | gridVisibleChanged(bool visible)
void | labelDelegateChanged()
void | labelsAngleChanged(qreal angle)
void | labelsVisibleChanged(bool visible)
void | lineVisibleChanged(bool visible)
void | subGridVisibleChanged(bool visible)
void | titleColorChanged(QColor color)
void | titleFontChanged(const QFont &font)
void | titleTextChanged(const QString &title)
void | titleVisibleChanged(bool visible)
void | update()
void | visibleChanged(bool visible)

## Detailed Description

Each series can be bound to only one horizontal and vertical axis.

The properties and visibility of various axis elements, such as axis line, title, labels, and grid lines, can be individually controlled.

## Member Type Documentation

### enum class QAbstractAxis::AxisType

This enum type specifies the type of the axis object.

Constant | Value
--- | ---
`QAbstractAxis::AxisType::Value` | `0`
`QAbstractAxis::AxisType::BarCategory` | `1`
`QAbstractAxis::AxisType::DateTime` | `2`

## Property Documentation

### `[since 6.9]` alignment : Qt::Alignment

This property holds the alignment of the axis.

Can be Qt::AlignLeft, Qt::AlignRight, Qt::AlignBottom, or Qt::AlignTop.

This property was introduced in Qt 6.9.

Access functions:

Qt::Alignment | alignment() const
void | setAlignment(Qt::Alignment alignment)

Notifier signal:

void | alignmentChanged(Qt::Alignment alignment)

### gridVisible : bool

This property holds the visibility of the grid lines. By default, the value is `true`.

Access functions:

bool | isGridVisible() const
void | setGridVisible(bool visible = true)

Notifier signal:

void | gridVisibleChanged(bool visible)

### labelDelegate : QQmlComponent*

This property holds a custom QML Component used as a label for the axis. This component should either be a Text component or contain "property string text", so that this property will be assigned the value of the label.

Access functions:

QQmlComponent * | labelDelegate() const
void | setLabelDelegate(QQmlComponent *newLabelDelegate)

Notifier signal:

void | labelDelegateChanged()

### labelsAngle : qreal

This property holds the angle of the axis labels in degrees.

Access functions:

qreal | labelsAngle() const
void | setLabelsAngle(qreal angle)

Notifier signal:

void | labelsAngleChanged(qreal angle)

### labelsVisible : bool

This property holds whether axis labels are visible. By default, the value is `true`.

Access functions:

bool | labelsVisible() const
void | setLabelsVisible(bool visible = true)

Notifier signal:

void | labelsVisibleChanged(bool visible)

### lineVisible : bool

This property holds the visibility of the axis line. By default, the value is `true`.

Access functions:

bool | isLineVisible() const
void | setLineVisible(bool visible = true)

Notifier signal:

void | lineVisibleChanged(bool visible)

### subGridVisible : bool

This property holds the visibility of the subgrid lines.

Applies only to axes that support subgrid lines. By default, the value is `true`.

Access functions:

bool | isSubGridVisible() const
void | setSubGridVisible(bool visible = true)

Notifier signal:

void | subGridVisibleChanged(bool visible)

### titleColor : QColor

This property holds the color used to draw the title text.

Access functions:

QColor | titleColor() const
void | setTitleColor(QColor color)

Notifier signal:

void | titleColorChanged(QColor color)

### titleFont : QFont

This property holds the font of the title of the axis.

Access functions:

QFont | titleFont() const
void | setTitleFont(const QFont &font)

Notifier signal:

void | titleFontChanged(const QFont &font)

### titleText : QString

This property holds the title of the axis.

Empty by default. Axis titles support HTML formatting.

Access functions:

QString | titleText() const
void | setTitleText(const QString &title)

Notifier signal:

void | titleTextChanged(const QString &title)

### titleVisible : bool

This property holds the visibility of the axis title.

By default, the value is `true`.

Access functions:

bool | isTitleVisible() const
void | setTitleVisible(bool visible = true)

Notifier signal:

void | titleVisibleChanged(bool visible)

### visible : bool

This property holds the visibility of the axis. By default, the value is `true`.

Access functions:

bool | isVisible() const
void | setVisible(bool visible = true)

Notifier signal:

void | visibleChanged(bool visible)

## Member Function Documentation

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

Destructs the axis object. When the axis is added to a graph, the graph object takes ownership.

### void QAbstractAxis::hide()

Makes the axis, labels, and grid lines invisible.

### void QAbstractAxis::setLineVisible(bool visible = true)

Determines whether the axis line and tick marks are visible.

Note: Setter function for property lineVisible.

See also isLineVisible().

### void QAbstractAxis::setMax(const QVariant &max)

Sets the maximum value shown on the axis. Depending on the actual axis type, the max parameter is converted to the appropriate type of value. If the conversion is impossible, the function call does nothing.

### void QAbstractAxis::setMin(const QVariant &min)

Sets the minimum value shown on the axis. Depending on the actual axis type, the min parameter is converted to the appropriate type of value. If the conversion is impossible, the function call does nothing.

### void QAbstractAxis::setRange(const QVariant &min, const QVariant &max)

Sets the range shown on the axis. Depending on the actual axis type, the min and max parameters are converted to appropriate types of values. If the conversion is impossible, the function call does nothing.

### void QAbstractAxis::setTitleColor(QColor color)

Sets the color used to draw titles to color.

Note: Setter function for property titleColor.

See also titleColor().

### void QAbstractAxis::setTitleFont(const QFont &font)

Sets the font used to draw titles to font.

Note: Setter function for property titleFont.

See also titleFont().

### void QAbstractAxis::setVisible(bool visible = true)

Sets the visibility of the axis, labels, and grid lines to visible.

Note: Setter function for property visible.

See also isVisible().

### void QAbstractAxis::show()

Makes the axis, labels, and grid lines visible.

### QColor QAbstractAxis::titleColor() const

Returns the color used to draw titles.

Note: Getter function for property titleColor.

See also setTitleColor().

### QFont QAbstractAxis::titleFont() const

Returns the font used to draw titles.

Note: Getter function for property titleFont.

See also setTitleFont().

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

Returns the type of the axis.

### `[signal]` void QAbstractAxis::update()

This signal is emitted when the axis needs to be updated.