QValueAxis Class

The QValueAxis class adds values to a chart'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

Properties

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 tickCount)
void tickAnchorChanged(qreal anchor)
void tickIntervalChanged(qreal interval)

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.

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 chart. 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 tickCount)

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 anchor)

tickInterval : qreal

This property holds the interval between dynamically placed tick marks and labels.

Access functions:

qreal tickInterval() const
void setTickInterval(qreal insterval)

Notifier signal:

void tickIntervalChanged(qreal interval)

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.

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.

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

Returns the type of the axis.