QwtPlotSeriesItem(3) Qwt User's Guide QwtPlotSeriesItem(3)

QwtPlotSeriesItem - Base class for plot items representing a series of samples.

#include <qwt_plot_seriesitem.h>

Inherits QwtPlotItem, and QwtAbstractSeriesStore.

Inherited by QwtPlotAbstractBarChart, QwtPlotCurve, QwtPlotHistogram, QwtPlotIntervalCurve, QwtPlotSpectroCurve, and QwtPlotTradingCurve.


QwtPlotSeriesItem (const QString &title=QString())
QwtPlotSeriesItem (const QwtText &title)
virtual ~QwtPlotSeriesItem ()
Destructor. void setOrientation (Qt::Orientation)
Qt::Orientation orientation () const
virtual void draw (QPainter *, const QwtScaleMap &xMap, const QwtScaleMap &yMap, const QRectF &) const
Draw the complete series. virtual void drawSeries (QPainter *painter, const QwtScaleMap &xMap, const QwtScaleMap &yMap, const QRectF &canvasRect, int from, int to) const =0
virtual QRectF boundingRect () const
virtual void updateScaleDiv (const QwtScaleDiv &, const QwtScaleDiv &)
Update the item to changes of the axes scale division.


virtual void dataChanged ()
dataChanged() indicates, that the series has been changed.

Base class for plot items representing a series of samples.

Constructor

Parameters:

title Title of the curve

Constructor

Parameters:

title Title of the curve

Returns:

An invalid bounding rect: QRectF(1.0, 1.0, -2.0, -2.0)

Note:

A width or height < 0.0 is ignored by the autoscaler

Reimplemented from QwtPlotItem.

Reimplemented in QwtPlotTradingCurve, QwtPlotIntervalCurve, QwtPlotHistogram, QwtPlotBarChart, and QwtPlotMultiBarChart.

Draw the complete series.

Parameters:

painter Painter
xMap Maps x-values into pixel coordinates.
yMap Maps y-values into pixel coordinates.
canvasRect Contents rectangle of the canvas

Implements QwtPlotItem.

Draw a subset of the samples

Parameters:

painter Painter
xMap Maps x-values into pixel coordinates.
yMap Maps y-values into pixel coordinates.
canvasRect Contents rectangle of the canvas
from Index of the first point to be painted
to Index of the last point to be painted. If to < 0 the curve will be painted to its last point.

Implemented in QwtPlotCurve, QwtPlotTradingCurve, QwtPlotIntervalCurve, QwtPlotHistogram, QwtPlotBarChart, QwtPlotMultiBarChart, and QwtPlotSpectroCurve.

Returns:

Orientation of the plot item

See also:

setOrientation()

Set the orientation of the item.

The orientation() might be used in specific way by a plot item. F.e. a QwtPlotCurve uses it to identify how to display the curve int QwtPlotCurve::Steps or QwtPlotCurve::Sticks style.

See also:

orientation()

Update the item to changes of the axes scale division. Update the item, when the axes of plot have changed. The default implementation does nothing, but items that depend on the scale division (like QwtPlotGrid()) have to reimplement updateScaleDiv()

updateScaleDiv() is only called when the ScaleInterest interest is enabled. The default implementation does nothing.

Parameters:

xScaleDiv Scale division of the x-axis
yScaleDiv Scale division of the y-axis

See also:

QwtPlot::updateAxes(), ScaleInterest

Reimplemented from QwtPlotItem.

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Wed Jan 2 2019 Version 6.1.4