QAbstractSeries Class

See also QXYSeries, QLineSeries, QSplineSeries, QScatterSeries, QAreaSeries, QAbstractBarSeries, QBarSeries, QStackedBarSeries, QPercentBarSeries, QHorizontalBarSeries, QHorizontalStackedBarSeries, QHorizontalPercentBarSeries, QPieSeries

This enum describes the type of the series.

This property holds the name of the series.

The name is displayed in the legend for the series and it supports HTML formatting.

Access functions:

• name() const

• void setName(const &name)

Notifier signal:

• void nameChanged()

This property holds the opacity of the series.

By default, the opacity is 1.0. The valid values range from 0.0 (transparent) to 1.0 (opaque).

Access functions:

• qreal opacity() const

• void setOpacity(qreal opacity)

Notifier signal:

• void opacityChanged()

This property holds the type of the series.

Access functions:

• virtual type() const = 0

Specifies whether or not drawing the series is accelerated by using OpenGL.

Acceleration using OpenGL is supported only for QLineSeries and QScatterSeries. A line series used as an edge series for QAreaSeries cannot use OpenGL acceleration. When a chart contains any series that are drawn with OpenGL, a transparent QOpenGLWidget is created on top of the chart plot area. The accelerated series are not drawn on the underlying QGraphicsView, but are instead drawn on the created QOpenGLWidget.

Performance gained from using OpenGL to accelerate series drawing depends on the underlying hardware, but in most cases it is significant. For example, on a standard desktop computer, enabling OpenGL acceleration for a series typically allows rendering at least a hundred times more points without reduction on the frame rate. Chart size also has less effect on the frame rate.

The OpenGL acceleration of series drawing is meant for use cases that need fast drawing of large numbers of points. It is optimized for efficiency, and therefore the series using it lack support for many features available to non-accelerated series:

• Series animations are not supported for accelerated series.

• Point labels are not supported for accelerated series.

• Pen styles, marker shapes and light markers are ignored for accelerated series. Only solid lines and plain scatter dots are supported. The scatter dots may be circular or rectangular, depending on the underlying graphics hardware and drivers.

• Polar charts do not support accelerated series.

• Enabling chart drop shadow or using transparent chart background color is not recommended when using accelerated series, as that can slow the frame rate down significantly.

These additional restrictions stem from the fact that the accelerated series is drawn on a separate widget on top of the chart:

• If you draw any graphics items on top of a chart containing an accelerated series, the accelerated series is drawn over those items.

• To enable QOpenGLWidget to be partially transparent, it needs to be stacked on top of all other widgets. This means you cannot have other widgets partially covering the chart when using accelerated series.

• Accelerated series are not supported for use cases where the graphics scene has more than one graphics view attached to it.

• Accelerated series are not supported for use cases where the chart has non-default geometry. For example, adding transforms to the graphics view causes the accelerated series to be drawn in an incorrect position related to the chart.

The default value is false.

Access functions:

• bool useOpenGL() const

• void setUseOpenGL(bool enable = true)

Notifier signal:

• void useOpenGLChanged()

This property holds whether the series is visible or not.

By default, true.

Access functions:

• bool isVisible() const

• void setVisible(bool visible = true)

Notifier signal:

• void visibleChanged()

Virtual destructor for the chart series.

Attaches the axis specified by axis to the series.

Returns true if the axis was attached successfully, false otherwise.

See Also▲

Returns the list of axes attached to the series. Usually, an x-axis and a y-axis are attached to a series, except for QPieSeries, which does not have any axes attached.

See Also▲

Returns the chart that the series belongs to.

Set automatically when the series is added to the chart, and unset when the series is removed from the chart.

Detaches the axis specified by axis from the series.

Returns true if the axis was detached successfully, false otherwise.

See Also▲

Sets the visibility of the series to false.

See Also▲

This signal is emitted when the series name changes.

This signal is emitted when the opacity of the series changes.

Sets the visibility of the series to true.

See Also▲

This signal is emitted when accelerating the drawing of the series by using OpenGL is enabled or disabled.

This signal is emitted when the series visibility changes.