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

NAME

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

SYNOPSIS

#include <qwt_plot_seriesitem.h>

Inherits QwtPlotItem, and QwtAbstractSeriesStore.

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

Public Member Functions


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.

Protected Member Functions


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

Additional Inherited Members

Detailed Description

Base class for plot items representing a series of samples.

Constructor & Destructor Documentation

QwtPlotSeriesItem::QwtPlotSeriesItem (const QString & title = QString()) [explicit]

Constructor

Parameters:

title Title of the curve

QwtPlotSeriesItem::QwtPlotSeriesItem (const QwtText & title) [explicit]

Constructor

Parameters:

title Title of the curve

Member Function Documentation

QRectF QwtPlotSeriesItem::boundingRect () const [virtual]

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.

void QwtPlotSeriesItem::draw (QPainter * painter, const QwtScaleMap & xMap, const QwtScaleMap & yMap, const QRectF & canvasRect) const [virtual]

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.

virtual void QwtPlotSeriesItem::drawSeries (QPainter * painter, const QwtScaleMap & xMap, const QwtScaleMap & yMap, const QRectF & canvasRect, int from, int to) const [pure virtual]

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.

Qt::Orientation QwtPlotSeriesItem::orientation () const

Returns:

Orientation of the plot item

See also:

setOrientation()

void QwtPlotSeriesItem::setOrientation (Qt::Orientation orientation)

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()

void QwtPlotSeriesItem::updateScaleDiv (const QwtScaleDiv & xScaleDiv, const QwtScaleDiv & yScaleDiv) [virtual]

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.

Author

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Wed Jan 2 2019 Version 6.1.4