Qwt User's Guide
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Base class for plot items representing a series of samples. More...
#include <qwt_plot_seriesitem.h>
Public Member Functions | |
QwtPlotSeriesItem (const QString &title=QString::null) | |
QwtPlotSeriesItem (const QwtText &title) | |
virtual | ~QwtPlotSeriesItem () |
Destructor. | |
void | setOrientation (Qt::Orientation) |
Qt::Orientation | orientation () const |
virtual void | draw (QPainter *p, 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. |
Base class for plot items representing a series of samples.
QwtPlotSeriesItem::QwtPlotSeriesItem | ( | const QString & | title = QString::null | ) | [explicit] |
Constructor
title | Title of the curve |
QwtPlotSeriesItem::QwtPlotSeriesItem | ( | const QwtText & | title | ) | [explicit] |
Constructor
title | Title of the curve |
QRectF QwtPlotSeriesItem::boundingRect | ( | ) | const [virtual] |
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.
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
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 |
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.
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.
xScaleDiv | Scale division of the x-axis |
yScaleDiv | Scale division of the y-axis |
Reimplemented from QwtPlotItem.