QAreaSeries Class

The QAreaSeries class presents data in area charts. More...

• List of all members, including inherited members

Properties

Public Functions

Reimplemented Public Functions

Signals

Detailed Description

An area series is used to show quantitative data. It is based on a line series, in the way that the area between the boundary lines is emphasized with color. Since the area series is based on the line series, the QAreaSeries constructor needs a QLineSeries instance, which defines the upper boundary of the area. The area chart is drawn using the bottom of the plot area as the lower boundary by default. Instead of the bottom of the plot area, the lower boundary can be specified by another line. In that case, QAreaSeries should be initialized with two QLineSeries instances.

See the area chart example to learn how to create a simple area chart.

series->setPointLabelsFormat("(@xPoint, @yPoint)");

Member Function Documentation

QAreaSeries::QAreaSeries(QLineSeries *upperSeries, QLineSeries *lowerSeries = nullptr)

Constructs an area series object that will be spanned between an upperSeries line and a lowerSeries line. If no lowerSeries is passed to the constructor, the x-axis is used as the lower bound instead.

The QAreaSeries does not own the upper or lower series, but the ownership stays with the caller. When the series object is added to QChartView or QChart, the instance ownership is transferred.

QAreaSeries::QAreaSeries(QObject *parent = nullptr)

Constructs an area series object without an upper or a lower series with the parent object.

[signal] void QAreaSeries::borderColorChanged(QColor color)

This signal is emitted when the line (pen) color changes to color.

Note: Notifier signal for property borderColor.

[signal] void QAreaSeries::clicked(const QPointF &point)

This signal is emitted when the user triggers a press on point by clicking it in an area chart.

See also pressed, released, and doubleClicked.

[signal] void QAreaSeries::colorChanged(QColor color)

This signal is emitted when the fill (brush) color changes to color.

Note: Notifier signal for property color.

[signal] void QAreaSeries::doubleClicked(const QPointF &point)

This signal is emitted when the user triggers the first press in an area chart by doubleclicking point.

See also pressed, released, and clicked.

[signal] void QAreaSeries::hovered(const QPointF &point, bool state)

This signal is emitted when the user hovers the mouse cursor over a series or moves it away from the series. point shows the origin (coordinate) of the hover event. state is true when the cursor hovers over the series and turns false when it moves away from the series.

[signal] void QAreaSeries::pointLabelsClippingChanged(bool clipping)

This signal is emitted when the clipping of the data point labels changes to clipping.

Note: Notifier signal for property pointLabelsClipping.

[signal] void QAreaSeries::pointLabelsColorChanged(const QColor &color)

This signal is emitted when the color used for data point labels changes to color.

Note: Notifier signal for property pointLabelsColor.

[signal] void QAreaSeries::pointLabelsFontChanged(const QFont &font)

This signal is emitted when the font used for data point labels changes to font.

Note: Notifier signal for property pointLabelsFont.

[signal] void QAreaSeries::pointLabelsFormatChanged(const QString &format)

This signal is emitted when the format of data point labels is changed.

Note: Notifier signal for property pointLabelsFormat.

[signal] void QAreaSeries::pointLabelsVisibilityChanged(bool visible)

This signal is emitted when the visibility of the data point labels changes to visible.

Note: Notifier signal for property pointLabelsVisible.

[signal] void QAreaSeries::pressed(const QPointF &point)

This signal is emitted when the user presses the point specified by point in an area chart.

See also clicked, released, and doubleClicked.

[signal] void QAreaSeries::released(const QPointF &point)

This signal is emitted when the user releases a press that was triggered on point in an area chart.

See also pressed, clicked, and doubleClicked.

[virtual] QAreaSeries::~QAreaSeries()

Destroys the object.

QBrush QAreaSeries::brush() const

Returns the brush used to draw the line for this series.

See also setBrush().

QPen QAreaSeries::pen() const

Returns the pen used to draw the line for this series.

See also setPen().

bool QAreaSeries::pointsVisible() const

Returns whether the points are drawn for this series.

See also setPointsVisible().

void QAreaSeries::setBrush(const QBrush &brush)

Sets the brush used for filling the area.

See also brush().

void QAreaSeries::setLowerSeries(QLineSeries *series)

Sets the series that is to be used as the area chart lower series.

See also lowerSeries().

void QAreaSeries::setPen(const QPen &pen)

Sets the pen used for drawing the area outline.

See also pen().

void QAreaSeries::setPointsVisible(bool visible = true)

Determines whether data points are visible and should be drawn on the line.

See also pointsVisible().

void QAreaSeries::setUpperSeries(QLineSeries *series)

Sets the series that is to be used as the area chart upper series. If the upper series is null, the area chart is not drawn, even if it has a lower series.

See also upperSeries().

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

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

Returns QAbstractSeries::SeriesTypeArea.