QLogValueAxis Class | Qt Charts 5.7

Qt 5.7 | Qt Charts | C++ Classes | QLogValueAxis

Qt 5.7.1 Reference Documentation

# QLogValueAxis Class

The QLogValueAxis class is used for manipulating chart's axis. More...

Header: | #include <QLogValueAxis>
Instantiated By: | LogValueAxis
Inherits: | QAbstractAxis

- List of all members, including inherited members

## Properties

- base : qreal
- labelFormat : QString
- max : qreal
- min : qreal

- 27 properties inherited from QAbstractAxis
- 1 property inherited from QObject

## Public Functions

| QLogValueAxis(QObject *parent = Q_NULLPTR)
| ~QLogValueAxis()
qreal | base() const
QString | labelFormat() const
qreal | max() const
qreal | min() const
void | setBase(qreal base)
void | setLabelFormat(const QString &format)
void | setMax(qreal max)
void | setMin(qreal min)
void | setRange(qreal min, qreal max)

## Reimplemented Public Functions

virtual AxisType | type() const

- 58 public functions inherited from QAbstractAxis
- 31 public functions inherited from QObject

## Signals

void | baseChanged(qreal base)
void | labelFormatChanged(const QString &format)
void | maxChanged(qreal max)
void | minChanged(qreal min)
void | rangeChanged(qreal min, qreal max)

- 25 signals inherited from QAbstractAxis
- 2 signals inherited from QObject

### Additional Inherited Members

- 1 public slot inherited from QObject
- 1 public variable inherited from QObject
- 10 static public members inherited from QObject
- 9 protected functions inherited from QObject
- 2 protected variables inherited from QObject

## Detailed Description

The QLogValueAxis class is used for manipulating chart's axis.

Note: If a QLogValueAxis is attached to a series with one or more points with negative or zero values on the associated dimension, the series will not be plotted at all. This is particularly relevant when XYModelMappers are used, since empty cells in models typically contain zero values.

## Property Documentation

### base : qreal

Defines the base of the logarithm. Value has to be greater than 0 and not equal 1

Access functions:

qreal | base() const
void | setBase(qreal base)

Notifier signal:

void | baseChanged(qreal base)

### labelFormat : QString

Defines the label format of the axis. Supported specifiers are: d, i, o, x, X, f, F, e, E, g, G, c See QString::sprintf() for additional details.

Access functions:

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

Notifier signal:

void | labelFormatChanged(const QString &format)

### max : qreal

Defines the maximum value on the axis. When setting this property the min is adjusted if necessary, to ensure that the range remains valid. Value has to be greater than 0.

Access functions:

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

Notifier signal:

void | maxChanged(qreal max)

### min : qreal

Defines the minimum value on the axis. When setting this property the max is adjusted if necessary, to ensure that the range remains valid. Value has to be greater than 0.

Access functions:

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

Notifier signal:

void | minChanged(qreal min)

## Member Function Documentation

### QLogValueAxis::QLogValueAxis(QObject *parent = Q_NULLPTR)

Constructs an axis object which is a child of parent.

### QLogValueAxis::~QLogValueAxis()

Destroys the object

### `[signal]` void QLogValueAxis::baseChanged(qreal base)

Axis emits signal when base of logarithm of the axis has changed.

Note: Notifier signal for property base.

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

Axis emits signal when format of axis labels has changed.

Note: Notifier signal for property labelFormat.

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

Axis emits signal when max of axis has changed.

Note: Notifier signal for property max.

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

Axis emits signal when min of axis has changed.

Note: Notifier signal for property min.

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

Axis emits signal when min or max of axis has changed.

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

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

### `[virtual]` AxisType QLogValueAxis::type() const

Reimplemented from QAbstractAxis::type().

Returns the type of the axis