- Qt 6.8
- 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
Instantiated By: | 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 int | label : QString labelColor : QColor selectedBars : const QList<int>

## Public Functions

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

## Public Slots

void | deselectAllBars()
void | deselectBar(int index)
void | deselectBars(const QList<int> &indexes)
void | selectAllBars()
void | selectBar(int index)
void | selectBars(const QList<int> &indexes)
void | setBarSelected(int index, bool selected)
void | toggleSelection(const QList<int> &indexes)

## 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<int> &indexes)
void | selectedColorChanged(const QColor &color)
void | update()
void | updatedBars()
void | valueAdded(int index, int count)
void | valueChanged(int index)
void | valueRemoved(int index, int count)
void | valuesAdded(int index, int count)
void | valuesChanged()
void | valuesRemoved(int index, int 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()
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()
void | setColor(QColor color)

Notifier signal:

void | colorChanged(QColor color)

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

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

Access functions:

int | count() const

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()
void | setLabelColor(QColor color)

Notifier signal:

void | labelColorChanged(QColor color)

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

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

Access functions:

QList<int> | selectedBars() const

Notifier signal:

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

## 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.

### void QBarSet::append(const QList<qreal> &values)

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

See also append().

### void QBarSet::append(const qreal value)

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

### qreal QBarSet::at(const int index) const

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

### QColor QBarSet::borderColor()

Returns the line color for the bar set.

Note: Getter function for property borderColor.

See also setBorderColor().

### `[signal]` void QBarSet::borderColorChanged(QColor color)

This signal is emitted when the border color of the bar set changes to color.

Note: Notifier signal for property borderColor.

### `[signal]` void QBarSet::borderWidthChanged(qreal width)

This signal is emitted when the barset's border width changes. The new width is width.

Note: Notifier signal for property borderWidth.

### QColor QBarSet::color()

Returns the fill color for the bar set.

Note: Getter function for property color.

See also setColor().

### `[signal]` void QBarSet::colorChanged(QColor color)

This signal is emitted when the fill color of the bar set changes to color.

Note: Notifier signal for property color.

### int QBarSet::count() const

Returns the number of values in a bar set.

Note: Getter function for property count.

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

This signal is emitted when the barset's value count changes.

Note: Notifier signal for property count.

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

Deselects all bars in the series.

Note: Emits QBarSet::selectedBarsChanged.

See also setBarSelected().

### `[slot]` void QBarSet::deselectBar(int index)

Deselects the bar at index.

Note: Emits QBarSet::selectedBarsChanged.

See also setBarSelected().

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

Marks multiple bars passed in an indexes list as deselected.

Note: Emits QBarSet::selectedBarsChanged.

See also setBarSelected().

### void QBarSet::insert(const int index, const qreal value)

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

See also remove().

### bool QBarSet::isBarSelected(int 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.

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().

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

This signal is emitted when the label of the bar set changes.

Note: Notifier signal for property label.

See also label.

### QColor QBarSet::labelColor()

Returns the text color for the bar set.

Note: Getter function for property labelColor.

See also setLabelColor().

### `[signal]` void QBarSet::labelColorChanged(QColor color)

This signal is emitted when the text (label) color of the bar set changes to color.

Note: Notifier signal for property labelColor.

### void QBarSet::remove(const int index, const int count = 1)

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

See also insert().

### void QBarSet::replace(const int index, const qreal value)

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

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

Marks all bars in the series as selected.

Note: Emits QBarSet::selectedBarsChanged.

See also setBarSelected().

### `[slot]` void QBarSet::selectBar(int index)

Marks the bar at index as selected.

Note: Emits QBarSet::selectedBarsChanged.

See also setBarSelected().

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

Marks multiple bars passed in an indexes list as selected.

Note: Emits QBarSet::selectedBarsChanged.

See also setBarSelected().

### QList<int> 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<int> &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.

See also setSelectedColor() and color.

### `[signal]` void QBarSet::selectedColorChanged(const QColor &color)

This signal is emitted when the selected bar color changes. The new color is indicated by color.

### `[slot]` void QBarSet::setBarSelected(int 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.

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(const QColor &color)

Sets the color of the selected bars.

See also selectedColor.

### qreal QBarSet::sum() const

Returns the sum of all values in the bar set.

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

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

Note: Emits QBarSet::selectedBarsChanged.

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(int index, int 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(int index)

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

See also at().

### `[signal]` void QBarSet::valueRemoved(int index, int 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(int index, int 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::valuesChanged()

This signal is emitted when the values of the bar set change.

Note: Notifier signal for property values.

### `[signal]` void QBarSet::valuesRemoved(int index, int 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<<(const 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[](const int index) const

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