QBarSeries Class

The QBarSeries class presents data in bar graphs. More...

Header:	`#include <QBarSeries>`
CMake:	`find_package(Qt6 REQUIRED COMPONENTS Graphs)` `target_link_libraries(mytarget PRIVATE Qt6::Graphs)`
qmake:	`QT += graphs`
In QML:	BarSeries
Inherits:	QAbstractSeries

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

Public Types

enum class	BarsType { Groups, Stacked, StackedPercent }
enum class	LabelsPosition { Center, InsideEnd, InsideBase, OutsideEnd }

Properties

barDelegate : QQmlComponent*
barSets : QList<QBarSet *> const
barWidth : qreal
barsType : BarsType
borderColors : QList<QColor>
count : const qsizetype
labelsAngle : qreal

labelsFormat : QString
labelsMargin : qreal
labelsPosition : LabelsPosition
labelsPrecision : int
labelsVisible : bool
seriesColors : QList<QColor>

Public Functions

	QBarSeries(QObject *parent = nullptr)
bool	append(QBarSet *set)
bool	append(const QList<QBarSet > &sets*)
QBarSet *	at(qsizetype index)
QQmlComponent *	barDelegate() const
QList<QBarSet *>	barSets() const
qreal	barWidth() const
QBarSeries::BarsType	barsType() const
QList<QColor>	borderColors() const
void	clear()
qsizetype	count() const
qsizetype	find(QBarSet *set) const
bool	insert(qsizetype index, QBarSet *set)
qreal	labelsAngle() const
QString	labelsFormat() const
qreal	labelsMargin() const
QBarSeries::LabelsPosition	labelsPosition() const
int	labelsPrecision() const
bool	labelsVisible() const
bool	remove(QBarSet *set)
bool	remove(qsizetype index)
void	removeMultiple(qsizetype index, qsizetype count)
bool	replace(const QList<QBarSet > &sets*)
bool	replace(QBarSet *oldValue, QBarSet *newValue)
void	replace(qsizetype index, QBarSet *set)
QList<QColor>	seriesColors() const
void	setBarDelegate(QQmlComponent *newBarDelegate)
void	setBarWidth(qreal width)
void	setBarsType(QBarSeries::BarsType type)
void	setBorderColors(const QList<QColor> &newBorderColors)
void	setLabelsAngle(qreal angle)
void	setLabelsFormat(const QString &format)
void	setLabelsMargin(qreal margin)
void	setLabelsPosition(QBarSeries::LabelsPosition position)
void	setLabelsPrecision(int precision)
void	setLabelsVisible(bool visible = true)
void	setSeriesColors(const QList<QColor> &newSeriesColors)
bool	take(QBarSet *set)

Reimplemented Public Functions

virtual QAbstractSeries::SeriesType type() const override

Signals

void	barDelegateChanged()
void	barSetsChanged()
void	barWidthChanged()
void	barsTypeChanged(QBarSeries::BarsType type)
void	barsetsAdded(const QList<QBarSet > &sets*)
void	barsetsRemoved(const QList<QBarSet > &sets*)
void	borderColorsChanged()
void	countChanged()
void	labelsAngleChanged(qreal angle)
void	labelsFormatChanged(const QString &format)
void	labelsMarginChanged(qreal margin)
void	labelsPositionChanged(QBarSeries::LabelsPosition position)
void	labelsPrecisionChanged(int precision)
void	labelsVisibleChanged(bool visible)
void	seriesColorsChanged()
void	setValueAdded(qsizetype index, qsizetype count, QBarSet *barset)
void	setValueChanged(qsizetype index, QBarSet *barset)
void	setValueRemoved(qsizetype index, qsizetype count, QBarSet *barset)
void	updatedBars()

Detailed Description

This class draws data by default as a series of bars grouped by category, with one bar per category from each bar set added to the series. It also supports horizontal bars and grouping bars as stacked.

A bar series needs the GraphsView x-axis to be set to a BarCategoryAxis and the y-axis set to ValueAxis.

See also QBarSet and QAbstractSeries.

Member Type Documentation

enum class QBarSeries::BarsType

This enum value describes the type of the bar series:

Constant	Value	Description
`QBarSeries::BarsType::Groups`	`0`	Bar sets are grouped by category.
`QBarSeries::BarsType::Stacked`	`1`	Bar sets are stacked after each other by category.
`QBarSeries::BarsType::StackedPercent`	`2`	Bar sets are stacked after each other by category. The segment size corresponds to the percentage of the segment value compared with the total value of all segments in the stack.

enum class QBarSeries::LabelsPosition

This enum value describes the position of the data value labels:

Constant	Value	Description
`QBarSeries::LabelsPosition::Center`	`0`	Label is located in the center of the bar.
`QBarSeries::LabelsPosition::InsideEnd`	`1`	Label is located inside the bar at the top.
`QBarSeries::LabelsPosition::InsideBase`	`2`	Label is located inside the bar at the bottom.
`QBarSeries::LabelsPosition::OutsideEnd`	`3`	Label is located outside the bar at the top.

Property Documentation

barDelegate : QQmlComponent*

This property holds a custom QML component used for visualizing each of the bars. Instance of this component is created for each of the bar. When this is not defined, a default rectangle visualization for bars is used.

The dynamic properties available for this component are:

Type	Name	Description
QColor	barColor	The fill color of the bar. This value comes either from the QGraphsTheme or from QBarSet::color if the QBarSet overrides the color.
QColor	barBorderColor	The border color of the bar. This value comes either from the QGraphsTheme or from QBarSet::borderColor if the QBarSet overrides the color.
qreal	barBorderWidth	The width of the bar border. This value comes either from the QGraphsTheme or from QBarSet::borderWidth if the QBarSet overrides the width.
qreal	barValue	The value of the bar. This value comes from the QBarSet::values.
QString	barLabel	The label of the bar. This value comes from the QBarSet::label.
bool	barSelected	This value is true when the bar is selected, meaning that the bar index is in QBarSet::selectedBars.

To use any of these, add property with the defined name into your custom component. For example "property color barColor" and "property real barValue".

Access functions:

QQmlComponent *	barDelegate() const
void	setBarDelegate(QQmlComponent *newBarDelegate)

Notifier signal:

void	barDelegateChanged()

`[read-only]` barSets : QList<QBarSet *> const

This property holds a list of sets added to the series.

Access functions:

QList<QBarSet *> barSets() const

Notifier signal:

void	barSetsChanged()

barWidth : qreal

This property holds the width of the bars of the series.

The unit of width is the unit of the x-axis. The minimum width for bars is zero, and negative values are treated as zero. Setting the width to zero means that the width of the bar on the screen is one pixel regardless of the scale of the x-axis. Bars wider than zero are scaled using the x-axis scale.

By default, the barWidth is 0.5 (bars will take 50% of the available width). The valid values range from 0.0 (0%) to 1.0 (100%).

Note: When used with QBarSeries, this value specifies the width of a group of bars instead of that of a single bar.

Access functions:

qreal	barWidth() const
void	setBarWidth(qreal width)

Notifier signal:

void	barWidthChanged()

See also QBarSeries.

barsType : BarsType

This property holds the type of the bar series.

Access functions:

QBarSeries::BarsType	barsType() const
void	setBarsType(QBarSeries::BarsType type)

Notifier signal:

void	barsTypeChanged(QBarSeries::BarsType type)

borderColors : QList<QColor>

This property holds the list of border colors to be used for all the objects in the series.

If there are more series than colors, the color list wraps and starts again with the first color in the list. If this is not set (default), colors from the QGraphsTheme::borderColors will be used.

Access functions:

QList<QColor>	borderColors() const
void	setBorderColors(const QList<QColor> &newBorderColors)

Notifier signal:

void	borderColorsChanged()

`[read-only]` count : const qsizetype

This property holds the number of bar sets in a bar series.

Access functions:

qsizetype count() const [see note below]

Note: This function can be invoked via the meta-object system and from QML. See Q_INVOKABLE.

Notifier signal:

void	countChanged()

labelsAngle : qreal

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

Access functions:

qreal	labelsAngle() const
void	setLabelsAngle(qreal angle)

Notifier signal:

void	labelsAngleChanged(qreal angle)

labelsFormat : QString

This property holds the format used for showing labels in a bar series.

QBarSeries supports the following format tag:

@value

The value of the bar

For example, the following usage of the format tags would produce labels that show the value followed by the unit (u):

 series->setLabelsFormat("@value u");

By default, the labels show the value of the bar. For the percent bar series, % is added after the value. The labels are shown on the plot area, if the bars are close to each other, the labels may overlap.

Access functions:

QString	labelsFormat() const
void	setLabelsFormat(const QString &format)

Notifier signal:

void	labelsFormatChanged(const QString &format)

See also labelsVisible, labelsPosition, and labelsPrecision.

labelsMargin : qreal

This property holds the margin of the value labels in pixels.

This margin from side is used when labelsPosition is set to something else than LabelsPosition.Center. The default value is 0.

Access functions:

qreal	labelsMargin() const
void	setLabelsMargin(qreal margin)

Notifier signal:

void	labelsMarginChanged(qreal margin)

labelsPosition : LabelsPosition

This property holds the position of value labels.

Access functions:

QBarSeries::LabelsPosition	labelsPosition() const
void	setLabelsPosition(QBarSeries::LabelsPosition position)

Notifier signal:

void	labelsPositionChanged(QBarSeries::LabelsPosition position)

See also labelsVisible and labelsFormat.

labelsPrecision : int

This property holds the maximum amount of significant digits shown in value labels.

Default value is 6.

Access functions:

int	labelsPrecision() const
void	setLabelsPrecision(int precision)

Notifier signal:

void	labelsPrecisionChanged(int precision)

labelsVisible : bool

This property holds the visibility of the labels in a bar series. The default label visibility is false.

Access functions:

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

Notifier signal:

void	labelsVisibleChanged(bool visible)

seriesColors : QList<QColor>

This property holds the list of base colors to be used for all the objects in the series.

If there are more series than colors, the color list wraps and starts again with the first color in the list. If this is not set (default), colors from the QGraphsTheme::seriesColors will be used.

Access functions:

QList<QColor>	seriesColors() const
void	setSeriesColors(const QList<QColor> &newSeriesColors)

Notifier signal:

void	seriesColorsChanged()

Member Function Documentation

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

Constructs an empty bar series that is a QObject and a child of parent.

`[invokable]` bool QBarSeries::append(QBarSet **set*)

Adds a set of bars specified by set to the bar series and takes ownership of it. If the set is null or it already belongs to the series, it will not be appended. Returns true if appending succeeded.

Note: This function can be invoked via the meta-object system and from QML. See Q_INVOKABLE.

`[invokable]` bool QBarSeries::append(const QList<QBarSet > &sets*)

Adds a list of bar sets specified by sets to a bar series and takes ownership of the sets. Returns true if all sets were appended successfully. If any of the sets is null or was previously appended to the series, nothing is appended and this function returns false. If any of the sets appears in the list more than once, nothing is appended and this function returns false.

Note: This function can be invoked via the meta-object system and from QML. See Q_INVOKABLE.

`[invokable]` QBarSet QBarSeries::at(qsizetype index*)

Retrieves the BarSet specified at the location index. Returns null if no BarSet was found.

Note: This function can be invoked via the meta-object system and from QML. See Q_INVOKABLE.

QList<QBarSet *> QBarSeries::barSets() const

Returns a list of bar sets in a bar series. Keeps the ownership of the bar sets.

Note: Getter function for property barSets.

qreal QBarSeries::barWidth() const

Returns the width of the bars of the series.

Note: Getter function for property barWidth.

See also setBarWidth().

`[signal]` void QBarSeries::barsetsAdded(const QList<QBarSet > &sets*)

This signal is emitted when the bar sets specified by sets are added to the series.

See also append() and insert().

`[signal]` void QBarSeries::barsetsRemoved(const QList<QBarSet > &sets*)

This signal is emitted when the bar sets specified by sets are removed from the series.

See also remove().

`[invokable]` void QBarSeries::clear()

Removes all bar sets from the series and permanently deletes them.

Note: This function can be invoked via the meta-object system and from QML. See Q_INVOKABLE.

`[invokable]` qsizetype QBarSeries::count() const

Returns the number of bar sets in a bar series.

Note: This function can be invoked via the meta-object system and from QML. See Q_INVOKABLE.

Note: Getter function for property count.

`[invokable]` qsizetype QBarSeries::find(QBarSet **set*) const

Returns the index of the first BarSet found as defined by set. Returns -1 if no BarSet was found.

Note: This function can be invoked via the meta-object system and from QML. See Q_INVOKABLE.

`[invokable]` bool QBarSeries::insert(qsizetype index, QBarSet **set*)

Inserts a bar set specified by set to a series at the position specified by index and takes ownership of the set. If the set is null or already belongs to the series, it will not be appended. Returns true if inserting succeeds.

Note: This function can be invoked via the meta-object system and from QML. See Q_INVOKABLE.

bool QBarSeries::labelsVisible() const

Returns the visibility of labels.

Note: Getter function for property labelsVisible.

See also setLabelsVisible().

`[signal]` void QBarSeries::labelsVisibleChanged(bool visible)

This signal is emitted when the labels' visibility changes to visible.

Note: Notifier signal for property labelsVisible.

See also labelsVisible() and setLabelsVisible().

`[invokable]` bool QBarSeries::remove(QBarSet **set*)

Removes the bar set specified by set from the series and permanently deletes it if the removal succeeds. Returns true if the set was removed.

Note: This function can be invoked via the meta-object system and from QML. See Q_INVOKABLE.

`[invokable]` bool QBarSeries::remove(qsizetype index)

Removes the BarSet at the location index. The BarSet will be permanently deleted.

Note: This function can be invoked via the meta-object system and from QML. See Q_INVOKABLE.

`[invokable]` void QBarSeries::removeMultiple(qsizetype index, qsizetype count)

Removes multiple BarSets from the series starting from index to a number of count. The BarSets will be permanently deleted.

Note: This function can be invoked via the meta-object system and from QML. See Q_INVOKABLE.

`[invokable]` bool QBarSeries::replace(const QList<QBarSet > &sets*)

Replaces the entire BarSet list inside of this BarSeries with the BarSets specified by sets. All of the original BarSets will be permanently deleted. Returns true if all BarSets are replaced.

Note: This function can be invoked via the meta-object system and from QML. See Q_INVOKABLE.

`[invokable]` bool QBarSeries::replace(QBarSet **oldValue*, QBarSet **newValue*)

Replaces the BarSet specified by oldValue with the one in newValue. The BarSet in oldValue will be permanently deleted if found inside the series. Returns true if the replace is successful.

Note: This function can be invoked via the meta-object system and from QML. See Q_INVOKABLE.

`[invokable]` void QBarSeries::replace(qsizetype index, QBarSet **set*)

Replaces the BarSet which is present at index with set. The original BarSet will be permanently deleted.

Note: This function can be invoked via the meta-object system and from QML. See Q_INVOKABLE.

void QBarSeries::setBarWidth(qreal width)

Sets the width of the bars of the series to width.

Note: Setter function for property barWidth.

See also barWidth().

void QBarSeries::setLabelsVisible(bool visible = true)

Sets the visibility of labels in a bar series to visible.

Note: Setter function for property labelsVisible.

See also labelsVisible().

`[signal]` void QBarSeries::setValueAdded(qsizetype index, qsizetype count, QBarSet **barset*)

This signal is emitted when a barset's value is changed. index is the index of the barset in the series. The number of the added values is indicated count. The barset is a pointer to the changed set.

`[signal]` void QBarSeries::setValueChanged(qsizetype index, QBarSet **barset*)

This signal is emitted when a barset's value is changed. index is the index of the barset in the series. The barset is a pointer to the changed set.

`[signal]` void QBarSeries::setValueRemoved(qsizetype index, qsizetype count, QBarSet **barset*)

This signal is emitted when a barset's value is changed. index is the index of the barset in the series. The number of the removed values is indicated count. The barset is a pointer to the changed set.

`[invokable]` bool QBarSeries::take(QBarSet **set*)

Takes a single set from the series. Does not delete the bar set object.

Note: The series remains the barset's parent object. You must set the parent object to take full ownership.

Returns true if the take operation succeeds.

Note: This function can be invoked via the meta-object system and from QML. See Q_INVOKABLE.

`[override virtual]` QAbstractSeries::SeriesType QBarSeries::type() const

Reimplements an access function for property: QAbstractSeries::type.

Returns the bar series.

`[signal]` void QBarSeries::updatedBars()

This signal is emitted when bars are updated.

Contents

QBarSeries Class

Public Types

Properties

Public Functions

Reimplemented Public Functions

Signals

Detailed Description

Member Type Documentation

enum class QBarSeries::BarsType

enum class QBarSeries::LabelsPosition

Property Documentation

barDelegate : QQmlComponent*

[read-only] barSets : QList<QBarSet *> const

barWidth : qreal

barsType : BarsType

borderColors : QList<QColor>

[read-only] count : const qsizetype

labelsAngle : qreal

labelsFormat : QString

labelsMargin : qreal

labelsPosition : LabelsPosition

labelsPrecision : int

labelsVisible : bool

seriesColors : QList<QColor>

Member Function Documentation

[explicit] QBarSeries::QBarSeries(QObject *parent = nullptr)

[invokable] bool QBarSeries::append(QBarSet *set)

[invokable] bool QBarSeries::append(const QList<QBarSet *> &sets)

[invokable] QBarSet *QBarSeries::at(qsizetype index)

QList<QBarSet *> QBarSeries::barSets() const

qreal QBarSeries::barWidth() const

[signal] void QBarSeries::barsetsAdded(const QList<QBarSet *> &sets)

[signal] void QBarSeries::barsetsRemoved(const QList<QBarSet *> &sets)

[invokable] void QBarSeries::clear()

[invokable] qsizetype QBarSeries::count() const

[invokable] qsizetype QBarSeries::find(QBarSet *set) const

[invokable] bool QBarSeries::insert(qsizetype index, QBarSet *set)

bool QBarSeries::labelsVisible() const

[signal] void QBarSeries::labelsVisibleChanged(bool visible)

[invokable] bool QBarSeries::remove(QBarSet *set)

[invokable] bool QBarSeries::remove(qsizetype index)

[invokable] void QBarSeries::removeMultiple(qsizetype index, qsizetype count)

[invokable] bool QBarSeries::replace(const QList<QBarSet *> &sets)

[invokable] bool QBarSeries::replace(QBarSet *oldValue, QBarSet *newValue)

[invokable] void QBarSeries::replace(qsizetype index, QBarSet *set)

void QBarSeries::setBarWidth(qreal width)

void QBarSeries::setLabelsVisible(bool visible = true)

[signal] void QBarSeries::setValueAdded(qsizetype index, qsizetype count, QBarSet *barset)

[signal] void QBarSeries::setValueChanged(qsizetype index, QBarSet *barset)

[signal] void QBarSeries::setValueRemoved(qsizetype index, qsizetype count, QBarSet *barset)

[invokable] bool QBarSeries::take(QBarSet *set)

[override virtual] QAbstractSeries::SeriesType QBarSeries::type() const

[signal] void QBarSeries::updatedBars()

`[read-only]` barSets : QList<QBarSet *> const

`[read-only]` count : const qsizetype

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

`[invokable]` bool QBarSeries::append(QBarSet **set*)

`[invokable]` bool QBarSeries::append(const QList<QBarSet > &sets*)

`[invokable]` QBarSet QBarSeries::at(qsizetype index*)

`[signal]` void QBarSeries::barsetsAdded(const QList<QBarSet > &sets*)

`[signal]` void QBarSeries::barsetsRemoved(const QList<QBarSet > &sets*)

`[invokable]` void QBarSeries::clear()

`[invokable]` qsizetype QBarSeries::count() const

`[invokable]` qsizetype QBarSeries::find(QBarSet **set*) const

`[invokable]` bool QBarSeries::insert(qsizetype index, QBarSet **set*)

`[signal]` void QBarSeries::labelsVisibleChanged(bool visible)

`[invokable]` bool QBarSeries::remove(QBarSet **set*)

`[invokable]` bool QBarSeries::remove(qsizetype index)

`[invokable]` void QBarSeries::removeMultiple(qsizetype index, qsizetype count)

`[invokable]` bool QBarSeries::replace(const QList<QBarSet > &sets*)

`[invokable]` bool QBarSeries::replace(QBarSet **oldValue*, QBarSet **newValue*)

`[invokable]` void QBarSeries::replace(qsizetype index, QBarSet **set*)

`[signal]` void QBarSeries::setValueAdded(qsizetype index, qsizetype count, QBarSet **barset*)

`[signal]` void QBarSeries::setValueChanged(qsizetype index, QBarSet **barset*)

`[signal]` void QBarSeries::setValueRemoved(qsizetype index, qsizetype count, QBarSet **barset*)

`[invokable]` bool QBarSeries::take(QBarSet **set*)

`[override virtual]` QAbstractSeries::SeriesType QBarSeries::type() const

`[signal]` void QBarSeries::updatedBars()