QColorAxis Class

The QColorAxis class displays a color scale as one of the chart's axes. More...

Header: #include <QColorAxis>
Since: Qt 6.2
Inherits: QAbstractAxis

Properties

Public Functions

virtual ~QColorAxis()
bool autoRange() const
QLinearGradient gradient() const
qreal max() const
qreal min() const
void setAutoRange(bool autoRange)
void setGradient(const QLinearGradient &gradient)
void setMax(qreal max)
void setMin(qreal min)
void setSize(const qreal size)
void setTickCount(int count)
qreal size() const
int tickCount() const

Signals

void autoRangeChanged(bool autoRange)
void maxChanged(qreal max)
void minChanged(qreal min)
void rangeChanged(qreal min, qreal max)
void sizeChanged(const qreal size)
void tickCountChanged(int tickCount)

Detailed Description

A color axis can be set up to show a color scale based on the passed gradient. The scale has tick marks with labels based on data passed in QXYSeries::colorby method.

Property Documentation

autoRange : bool

This property holds the property indicating if the range should be set from the list of values passed in QXYSeries::colorBy method or rather taken from the axis itself.

The default value is true.

Access functions:

bool autoRange() const
void setAutoRange(bool autoRange)

Notifier signal:

void autoRangeChanged(bool autoRange)

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.

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.

Access functions:

qreal min() const
void setMin(qreal min)

Notifier signal:

void minChanged(qreal min)

size : qreal

This property holds the size of the color scale.

Depending on the alignment the value indicates either width or height.

Access functions:

qreal size() const
void setSize(const qreal size)

Notifier signal:

void sizeChanged(const qreal size)

tickCount : int

This property holds the number of tick marks on the axis. This indicates how many grid lines are drawn on the chart if QColorAxis::gridVisible is equal to true. The default value is 5, and the number cannot be less than 2.

Note: Grid lines are intentionally invisible by default in QColorAxis as this type of axis does not represent geometric values.

Access functions:

int tickCount() const
void setTickCount(int count)

Notifier signal:

void tickCountChanged(int tickCount)

Member Function Documentation

[signal] void QColorAxis::autoRangeChanged(bool autoRange)

This signal is emitted when the auto range mode, specified by autoRange, changes.

Note: Notifier signal for property autoRange.

[signal] void QColorAxis::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 QColorAxis::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 QColorAxis::rangeChanged(qreal min, qreal max)

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

[signal] void QColorAxis::tickCountChanged(int tickCount)

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

Note: Notifier signal for property tickCount.

[virtual] QColorAxis::~QColorAxis()

Destroys the object.

QLinearGradient QColorAxis::gradient() const

Returns the gradient currently used on the color scale.

Note: If the axis is attached to a series, the gradient is also used by the QXYSeries::colorBy method.

See also setGradient.

void QColorAxis::setGradient(const QLinearGradient &gradient)

Sets the gradient on the color scale to gradient.

Note: If the axis is attached to a series, the gradient is also used by the QXYSeries::colorBy method.

See also gradient.

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