Member Function Documentation

QChart::QChart(QGraphicsItem *parent = Q_NULLPTR, Qt::WindowFlags wFlags = Qt::WindowFlags())

Constructs a chart object which is a child of a parent. Parameter wFlags is passed to the QGraphicsWidget constructor.

QChart::~QChart()

Destroys the chart object and its children, like series and axis objects added to it.

void QChart::addAxis(QAbstractAxis *axis, Qt::Alignment alignment)

Adds the axis to the chart with alignment. The chart takes the ownership of the axis.

See also removeAxis(), createDefaultAxes(), and QAbstractSeries::attachAxis().

void QChart::addSeries(QAbstractSeries *series)

Adds the series onto the chart and takes the ownership of it.

Note: A newly added series is attached to no axes by default, including any axes that were created for the chart using createDefaultAxes() before the series was added to the chart. If no axes are attached to the newly added series before the chart is shown, the series will get drawn as if it had axes with ranges that exactly fit the series to the plot area of the chart. This can be confusing if the same chart also displays other series that have properly attached axes, so always make sure you either call createDefaultAxes() after a series has been added or explicitly attach axes for the series.

See also removeSeries(), removeAllSeries(), createDefaultAxes(), and QAbstractSeries::attachAxis().

QList<QAbstractAxis *> QChart::axes(Qt::Orientations orientation = Qt::Horizontal | Qt::Vertical, QAbstractSeries *series = Q_NULLPTR) const

Returns the axes attached to the series with orientation. If no series is provided, then all axes added to the chart with the specified orientation are returned.

See also addAxis() and createDefaultAxes().

QAbstractAxis *QChart::axisX(QAbstractSeries *series = Q_NULLPTR) const

Returns a pointer to the horizontal axis attached to the specified series. If no series is specified, the first horizontal axis added to the chart is returned.

See also setAxisX(), addAxis(), and QAbstractSeries::attachAxis().

QAbstractAxis *QChart::axisY(QAbstractSeries *series = Q_NULLPTR) const

Returns a pointer to the vertical axis attached to the specified series. If no series is specified, the first vertical axis added to the chart is returned.

See also setAxisY(), addAxis(), and QAbstractSeries::attachAxis().

QBrush QChart::backgroundBrush() const

Gets the brush that is used for painting the background of the chart area.

See also setBackgroundBrush().

QPen QChart::backgroundPen() const

Gets the pen that is used for painting the background of the chart area.

See also setBackgroundPen().

void QChart::createDefaultAxes()

Creates axes for the chart based on the series that have already been added to the chart. Any axes previously added to the chart will be deleted.

Note: This function has to be called after all series have been added to the chart. The axes created by this function will NOT get automatically attached to any series added to the chart after this function has been called. A series with no axes attached will by default scale to utilize the entire plot area of the chart, which can be confusing if there are other series with properly attached axes also present.

If there are several QXYSeries derived series added to the chart and no series of other types have been added, then only one pair of axes is created. If there are several series of different types added to the chart, then each series gets its own axes pair.

The axes specific to the series can be later obtained from the chart by providing the series as the parameter for axes() function call. QPieSeries does not create any axes.

See also axisX(), axisY(), axes(), setAxisX(), setAxisY(), and QAbstractSeries::attachAxis().

bool QChart::isZoomed()

Returns true if any series has a zoomed domain.

QLegend *QChart::legend() const

Returns the legend object of the chart. Ownership stays with the chart.

QPointF QChart::mapToPosition(const QPointF &value, QAbstractSeries *series = Q_NULLPTR)

Returns the position on the chart widget that corresponds to the value in the series domain.

QPointF QChart::mapToValue(const QPointF &position, QAbstractSeries *series = Q_NULLPTR)

Returns the value in the series domain that corresponds to the position relative to chart widget.

QBrush QChart::plotAreaBackgroundBrush() const

Returns the brush for the background of the plot area of the chart.

See also plotArea(), plotAreaBackgroundVisible, plotAreaBackgroundPen(), and setPlotAreaBackgroundBrush().

QPen QChart::plotAreaBackgroundPen() const

Returns the pen for the background of the plot area of the chart.

See also plotArea(), plotAreaBackgroundVisible, plotAreaBackgroundBrush(), and setPlotAreaBackgroundPen().

void QChart::removeAllSeries()

Removes and deletes all series objects that have been added to the chart.

See also addSeries() and removeSeries().

void QChart::removeAxis(QAbstractAxis *axis)

Removes the axis from the chart. The chart releases its ownership of the specified axis object.

See also addAxis(), createDefaultAxes(), and QAbstractSeries::detachAxis().

void QChart::removeSeries(QAbstractSeries *series)

Removes the series from the chart. The chart releases its ownership of the specified series object.

See also addSeries() and removeAllSeries().

void QChart::scroll(qreal dx, qreal dy)

Scrolls the visible area of the chart by the distance defined in the dx and dy.

For polar charts, dx indicates the angle along angular axis instead of distance.

QList<QAbstractSeries *> QChart::series() const

Returns all series that are added to the chart.

See also addSeries(), removeSeries(), and removeAllSeries().

void QChart::setAxisX(QAbstractAxis *axis, QAbstractSeries *series = Q_NULLPTR)

Adds the axis to the chart and attaches it to the series as a bottom-aligned horizontal axis. The chart takes ownership of both the axis and the series. Any horizontal axes previously attached to the series are deleted.

See also axisX(), axisY(), setAxisY(), createDefaultAxes(), and QAbstractSeries::attachAxis().

void QChart::setAxisY(QAbstractAxis *axis, QAbstractSeries *series = Q_NULLPTR)

Adds the axis to the chart and attaches it to the series as a left-aligned vertical axis. The chart takes ownership of both the axis and the series. Any vertical axes previously attached to the series are deleted.

See also axisX(), axisY(), setAxisX(), createDefaultAxes(), and QAbstractSeries::attachAxis().

void QChart::setBackgroundBrush(const QBrush &brush)

Sets the brush that is used for painting the background of the chart area.

See also backgroundBrush().

void QChart::setBackgroundPen(const QPen &pen)

Sets the pen that is used for painting the background of the chart area.

See also backgroundPen().

void QChart::setPlotAreaBackgroundBrush(const QBrush &brush)

Sets the brush for the background of the plot area of the chart.

See also plotArea(), plotAreaBackgroundVisible, setPlotAreaBackgroundPen(), and plotAreaBackgroundBrush().

void QChart::setPlotAreaBackgroundPen(const QPen &pen)

Sets the pen for the background of the plot area of the chart.

See also plotArea(), plotAreaBackgroundVisible, setPlotAreaBackgroundBrush(), and plotAreaBackgroundPen().

void QChart::setTitleBrush(const QBrush &brush)

Sets the brush used for drawing the title text.

See also titleBrush().

void QChart::setTitleFont(const QFont &font)

Sets the font that is used for drawing the chart title.

See also titleFont().

QBrush QChart::titleBrush() const

Returns the brush used for drawing the title text.

See also setTitleBrush().

QFont QChart::titleFont() const

Gets the font that is used for drawing the chart title.

See also setTitleFont().

void QChart::zoom(qreal factor)

Zooms in the view by a custom factor.

A factor over 1.0 zooms the view in and factor between 0.0 and 1.0 zooms out.

void QChart::zoomIn()

Zooms in the view by a factor of two.

void QChart::zoomIn(const QRectF &rect)

Zooms in the view to a maximum level at which rect is still fully visible.

Note: This is not supported for polar charts.

void QChart::zoomOut()

Zooms out the view by a factor of two.

void QChart::zoomReset()

Resets the series domains to what they were before any zoom method was called. Note that this will also reset any scrolls and explicit axis range settings done between the first zoom operation and calling this method. If no zoom operation has been done, this method does nothing.