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

# QBarSet Class

The QBarSet class represents one set of bars in a bar graph. More...

Header: | `#include <QBarSet>`
CMake: | `find_package(Qt6 REQUIRED COMPONENTS Graphs)` `target_link_libraries(mytarget PRIVATE Qt6::Graphs)`
qmake: | `QT += graphs`
In QML: | BarSet
Inherits: | QObject

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

## Properties

borderColor : QColor borderWidth : qreal color : QColor count : const qsizetype label : QString | labelColor : QColor selectedBars : const QList<qsizetype> selectedColor : QColor values : QVariantList

## Public Functions

| QBarSet(const QString &label, QObject *parent = nullptr)
virtual | ~QBarSet() override
void | append(const QList<qreal> &values)
void | append(qreal value)
qreal | at(qsizetype index) const
QColor | borderColor() const
qreal | borderWidth() const
void | clear()
QColor | color() const
qsizetype | count() const
void | deselectAllBars()
void | deselectBar(qsizetype index)
void | deselectBars(const QList<qsizetype> &indexes)
void | insert(qsizetype index, qreal value)
bool | isBarSelected(qsizetype index) const
QString | label() const
QColor | labelColor() const
void | remove(qsizetype index, qsizetype count = 1)
void | replace(qsizetype index, qreal value)
void | selectAllBars()
void | selectBar(qsizetype index)
void | selectBars(const QList<qsizetype> &indexes)
QList<qsizetype> | selectedBars() const
QColor | selectedColor() const
void | setBarSelected(qsizetype index, bool selected)
void | setBorderColor(QColor color)
void | setBorderWidth(qreal borderWidth)
void | setColor(QColor color)
void | setLabel(const QString &label)
void | setLabelColor(QColor color)
void | setSelectedColor(QColor color)
void | setValues(const QVariantList &values)
qreal | sum() const
void | toggleSelection(const QList<qsizetype> &indexes)
QVariantList | values() const
QBarSet & | operator<<(qreal value)
qreal | operator[](qsizetype index) const

## Signals

void | borderColorChanged(QColor color)
void | borderWidthChanged(qreal width)
void | colorChanged(QColor color)
void | countChanged()
void | labelChanged()
void | labelColorChanged(QColor color)
void | selectedBarsChanged(const QList<qsizetype> &indexes)
void | selectedColorChanged(QColor color)
void | update()
void | updatedBars()
void | valueAdded(qsizetype index, qsizetype count)
void | valueChanged(qsizetype index)
void | valueRemoved(qsizetype index, qsizetype count)
void | valuesAdded(qsizetype index, qsizetype count)
void | valuesChanged()
void | valuesRemoved(qsizetype index, qsizetype count)

## Detailed Description

A bar set contains one data value for each category. The first value of a set is assumed to belong to the first category, the second one to the second category, and so on. If the set has fewer values than there are categories, the missing values are assumed to be located at the end of the set. For missing values in the middle of a set, the numerical value of zero is used. Labels for zero value sets are not shown.

See also QBarSeries.

## Property Documentation

### borderColor : QColor

This property holds the border color of the bar set.

Access functions:

QColor | borderColor() const
void | setBorderColor(QColor color)

Notifier signal:

void | borderColorChanged(QColor color)

### borderWidth : qreal

This property holds the width of the border line. By default, the width is -1, meaning the border width is defined by the theme.

Access functions:

qreal | borderWidth() const
void | setBorderWidth(qreal borderWidth)

Notifier signal:

void | borderWidthChanged(qreal width)

### color : QColor

This property holds the fill color of the bar set.

Access functions:

QColor | color() const
void | setColor(QColor color)

Notifier signal:

void | colorChanged(QColor color)

### `[read-only]` count : const qsizetype

This property holds the number of values in the bar set.

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()

### label : QString

This property holds the label of the bar set.

Access functions:

QString | label() const
void | setLabel(const QString &label)

Notifier signal:

void | labelChanged()

### labelColor : QColor

This property holds the text (label) color of the bar set.

Access functions:

QColor | labelColor() const
void | setLabelColor(QColor color)

Notifier signal:

void | labelColorChanged(QColor color)

### `[read-only]` selectedBars : const QList<qsizetype>

This property holds the indexes of the bars which are currently selected.

Access functions:

QList<qsizetype> | selectedBars() const

Notifier signal:

void | selectedBarsChanged(const QList<qsizetype> &indexes)

### selectedColor : QColor

This property holds the fill color of the selected set.

Access functions:

QColor | selectedColor() const
void | setSelectedColor(QColor color)

Notifier signal:

void | selectedColorChanged(QColor color)

### values : QVariantList

This property holds the values of the bar set.

You can set a list of either real or point types as values.

If you set a list of real types as values, they directly define the bar set values.

If you set a list of point types as values, the x-coordinate of the point specifies its zero-based index in the bar set. The size of the bar set is the highest x-coordinate value + 1. If a point is missing for any x-coordinate between zero and the highest value, it gets the value zero.

Access functions:

QVariantList | values() const
void | setValues(const QVariantList &values)

Notifier signal:

void | valuesChanged()

## Member Function Documentation

### `[explicit]` QBarSet::QBarSet(const QString &label, QObject *parent = nullptr)

Constructs a bar set with the label label and the parent parent.

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

Removes the bar set.

### `[invokable]` void QBarSet::append(const QList<qreal> &values)

Appends the list of real values specified by values to the end of the bar set.

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

See also append().

### `[invokable]` void QBarSet::append(qreal value)

Appends the new value specified by value to the end of the bar set.

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

### `[invokable]` qreal QBarSet::at(qsizetype index) const

Returns the value specified by index from the bar set. If the index is out of bounds, 0.0 is returned.

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

### QColor QBarSet::borderColor() const

Returns the line color for the bar set.

Note: Getter function for property borderColor.

See also setBorderColor().

### `[invokable]` void QBarSet::clear()

Removes all values from the set.

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

### QColor QBarSet::color() const

Returns the fill color for the bar set.

Note: Getter function for property color.

See also setColor().

### `[invokable]` qsizetype QBarSet::count() const

Returns the number of values in a bar set.

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

Note: Getter function for property count.

### `[invokable]` void QBarSet::deselectAllBars()

Deselects all bars in the set.

Note: Emits QBarSet::selectedBarsChanged.

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

See also setBarSelected().

### `[invokable]` void QBarSet::deselectBar(qsizetype index)

Deselects the bar at index.

Note: Emits QBarSet::selectedBarsChanged.

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

See also setBarSelected().

### `[invokable]` void QBarSet::deselectBars(const QList<qsizetype> &indexes)

Marks multiple bars passed in an indexes list as deselected.

Note: Emits QBarSet::selectedBarsChanged.

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

See also setBarSelected().

### `[invokable]` void QBarSet::insert(qsizetype index, qreal value)

Inserts value in the position specified by index. The values following the inserted value are moved up one position.

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

See also remove().

### `[invokable]` bool QBarSet::isBarSelected(qsizetype index) const

Returns `true` if the bar at the given index is among selected bars and `false` otherwise.

Note: Selected bars are drawn using the selected color if it was specified using QBarSet::setSelectedColor.

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

See also selectedBars(), setBarSelected(), and setSelectedColor().

### QString QBarSet::label() const

Returns the label of the bar set.

Note: Getter function for property label.

See also setLabel().

### QColor QBarSet::labelColor() const

Returns the text color for the bar set.

Note: Getter function for property labelColor.

See also setLabelColor().

### `[invokable]` void QBarSet::remove(qsizetype index, qsizetype count = 1)

Removes the number of values specified by count from the bar set starting with the value specified by index.

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

See also insert().

### `[invokable]` void QBarSet::replace(qsizetype index, qreal value)

Adds the value specified by value to the bar set at the position specified by index.

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

### `[invokable]` void QBarSet::selectAllBars()

Marks all bars in the set as selected.

Note: Emits QBarSet::selectedBarsChanged.

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

See also setBarSelected().

### `[invokable]` void QBarSet::selectBar(qsizetype index)

Marks the bar at index as selected.

Note: Emits QBarSet::selectedBarsChanged.

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

See also setBarSelected().

### `[invokable]` void QBarSet::selectBars(const QList<qsizetype> &indexes)

Marks multiple bars passed in an indexes list as selected.

Note: Emits QBarSet::selectedBarsChanged.

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

See also setBarSelected().

### QList<qsizetype> QBarSet::selectedBars() const

Returns a list of bars marked as selected.

Note: Getter function for property selectedBars.

See also setBarSelected().

### `[signal]` void QBarSet::selectedBarsChanged(const QList<qsizetype> &indexes)

This signal is emitted when the selected bar changes. indexes is a list selected bar indexes.

Note: Notifier signal for property selectedBars.

### QColor QBarSet::selectedColor() const

Returns the color of the selected bars.

This is the fill (brush) color of bars marked as selected. If not specified, value of QBarSet::color is used as default.

Note: Getter function for property selectedColor.

See also setSelectedColor() and color.

### `[invokable]` void QBarSet::setBarSelected(qsizetype index, bool selected)

Marks the bar at index as either selected or deselected as specified by selected.

Note: Selected bars are drawn using the selected color if it was specified. Emits QBarSet::selectedBarsChanged.

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

See also isBarSelected() and setSelectedColor().

### void QBarSet::setBorderColor(QColor color)

Sets the line color for the bar set to color.

Note: Setter function for property borderColor.

See also borderColor().

### void QBarSet::setColor(QColor color)

Sets the fill color for the bar set to color.

Note: Setter function for property color.

See also color().

### void QBarSet::setLabel(const QString &label)

Sets label as the new label for the bar set.

Note: Setter function for property label.

See also label().

### void QBarSet::setLabelColor(QColor color)

Sets the text color for the bar set to color.

Note: Setter function for property labelColor.

See also labelColor().

### void QBarSet::setSelectedColor(QColor color)

Sets the color of the selected bars.

Note: Setter function for property selectedColor.

See also selectedColor.

### `[invokable]` qreal QBarSet::sum() const

Returns the sum of all values in the bar set.

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

### `[invokable]` void QBarSet::toggleSelection(const QList<qsizetype> &indexes)

Changes the selection state of bars at the given indexes to the opposite one.

Note: Emits QBarSet::selectedBarsChanged.

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

See also setBarSelected().

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

This signal is emitted when the barset is updated.

### `[signal]` void QBarSet::updatedBars()

This signal is emitted when the bars in this set are updated.

### `[signal]` void QBarSet::valueAdded(qsizetype index, qsizetype count)

This signal is emitted when new values are added to the bar set. index indicates the position of the first inserted value, and count is the number of inserted values.

### `[signal]` void QBarSet::valueChanged(qsizetype index)

This signal is emitted when the value at the position specified by index is modified.

See also at().

### `[signal]` void QBarSet::valueRemoved(qsizetype index, qsizetype count)

This signal is emitted when values are removed from the bar set. index indicates the position of the first removed value, and count is the number of removed values.

### `[signal]` void QBarSet::valuesAdded(qsizetype index, qsizetype count)

This signal is emitted when new values are added to the bar set. index indicates the position of the first inserted value, and count is the number of inserted values.

See also append() and insert().

### `[signal]` void QBarSet::valuesRemoved(qsizetype index, qsizetype count)

This signal is emitted when values are removed from the bar set. index indicates the position of the first removed value, and count is the number of removed values.

See also remove().

### QBarSet &QBarSet::operator<<(qreal value)

A convenience operator for appending the real value specified by value to the end of the bar set.

See also append().

### qreal QBarSet::operator[](qsizetype index) const

Returns the value of the bar set specified by index. If the index is out of bounds, 0.0 is returned.