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

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, QwtPlotTradingCurve, and QwtPlotVectorField.

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 &canvasRect) const override
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 override
virtual void updateScaleDiv (const QwtScaleDiv &, const QwtScaleDiv &) override
Update the item to changes of the axes scale division.

Public Member Functions inherited from QwtPlotItem

QwtPlotItem ()
QwtPlotItem (const QString &title)
QwtPlotItem (const QwtText &title)
virtual ˜QwtPlotItem ()
Destroy the QwtPlotItem.
void attach (QwtPlot *plot)
Attach the item to a plot.
void detach ()
This method detaches a QwtPlotItem from any QwtPlot it has been associated with.
QwtPlot * plot () const
Return attached plot.
void setTitle (const QString &title)
void setTitle (const QwtText &title)
const QwtText & title () const
virtual int rtti () const
void setItemAttribute (ItemAttribute, bool on=true)
bool testItemAttribute (ItemAttribute) const
void setItemInterest (ItemInterest, bool on=true)
bool testItemInterest (ItemInterest) const
void setRenderHint (RenderHint, bool on=true)
bool testRenderHint (RenderHint) const
void setRenderThreadCount (uint numThreads)
uint renderThreadCount () const
void setLegendIconSize (const QSize &)
QSize legendIconSize () const
double z () const
void setZ (double z)
Set the z value.
void show ()
Show the item.
void hide ()
Hide the item.
virtual void setVisible (bool)
bool isVisible () const
void setAxes (QwtAxisId xAxis, QwtAxisId yAxis)
void setXAxis (QwtAxisId)
QwtAxisId xAxis () const
Return xAxis.
void setYAxis (QwtAxisId)
QwtAxisId yAxis () const
Return yAxis.
virtual void itemChanged ()
virtual void legendChanged ()
virtual void getCanvasMarginHint (const QwtScaleMap &xMap, const QwtScaleMap &yMap, const QRectF &canvasRect, double &left, double &top, double &right, double &bottom) const
Calculate a hint for the canvas margin.
virtual void updateLegend (const QwtPlotItem *, const QList< QwtLegendData > &)
Update the item to changes of the legend info.
QRectF scaleRect (const QwtScaleMap &, const QwtScaleMap &) const
Calculate the bounding scale rectangle of 2 maps.
QRectF paintRect (const QwtScaleMap &, const QwtScaleMap &) const
Calculate the bounding paint rectangle of 2 maps.
virtual QList< QwtLegendData > legendData () const
Return all information, that is needed to represent the item on the legend.
virtual QwtGraphic legendIcon (int index, const QSizeF &) const

Public Member Functions inherited from QwtAbstractSeriesStore

virtual ˜QwtAbstractSeriesStore ()
Destructor.

Protected Member Functions

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

Protected Member Functions inherited from QwtPlotItem

QwtGraphic defaultIcon (const QBrush &, const QSizeF &) const
Return a default icon from a brush.

Protected Member Functions inherited from QwtAbstractSeriesStore

virtual void setRectOfInterest (const QRectF &)=0
virtual QRectF dataRect () const =0
virtual size_t dataSize () const =0

Additional Inherited Members

Public Types inherited from QwtPlotItem

enum RttiValues { Rtti_PlotItem = 0, Rtti_PlotGrid, Rtti_PlotScale, Rtti_PlotLegend, Rtti_PlotMarker, Rtti_PlotCurve, Rtti_PlotSpectroCurve, Rtti_PlotIntervalCurve, Rtti_PlotHistogram, Rtti_PlotSpectrogram, Rtti_PlotGraphic, Rtti_PlotTradingCurve, Rtti_PlotBarChart, Rtti_PlotMultiBarChart, Rtti_PlotShape, Rtti_PlotTextLabel, Rtti_PlotZone, Rtti_PlotVectorField, Rtti_PlotUserItem = 1000 }
Runtime type information.
enum ItemAttribute { Legend = 0x01, AutoScale = 0x02, Margins = 0x04 }
Plot Item Attributes.
enum ItemInterest { ScaleInterest = 0x01, LegendInterest = 0x02 }
Plot Item Interests.
enum RenderHint { RenderAntialiased = 0x1 }
Render hints.
typedef QFlags< ItemAttribute > ItemAttributes
typedef QFlags< ItemInterest > ItemInterests
typedef QFlags< RenderHint > RenderHints

Detailed Description

Base class for plot items representing a series of samples.

Definition at line 24 of file qwt_plot_seriesitem.h.

Constructor & Destructor Documentation

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

Constructor

Parameters

title Title of the curve

Definition at line 40 of file qwt_plot_seriesitem.cpp.

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

Constructor

Parameters

title Title of the curve

Definition at line 29 of file qwt_plot_seriesitem.cpp.

QwtPlotSeriesItem::˜QwtPlotSeriesItem () [virtual]

Destructor.

Definition at line 48 of file qwt_plot_seriesitem.cpp.

Member Function Documentation

QRectF QwtPlotSeriesItem::boundingRect () const [override], [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 QwtPlotBarChart, QwtPlotHistogram, QwtPlotIntervalCurve, QwtPlotMultiBarChart, QwtPlotTradingCurve, and QwtPlotVectorField.

Definition at line 97 of file qwt_plot_seriesitem.cpp.

void QwtPlotSeriesItem::dataChanged () [override], [protected], [virtual]

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

Implements QwtAbstractSeriesStore.

Reimplemented in QwtPlotVectorField.

Definition at line 112 of file qwt_plot_seriesitem.cpp.

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

Definition at line 90 of file qwt_plot_seriesitem.cpp.

virtual void QwtPlotSeriesItem::drawSeries (QPainter * painter, constQwtScaleMap & 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 QwtPlotBarChart, QwtPlotCurve, QwtPlotHistogram, QwtPlotIntervalCurve, QwtPlotMultiBarChart, QwtPlotSpectroCurve, QwtPlotTradingCurve, and QwtPlotVectorField.

Qt::Orientation QwtPlotSeriesItem::orientation () const

Returns

Orientation of the plot item

See also

setOrientation()

Definition at line 77 of file qwt_plot_seriesitem.cpp.

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()

Definition at line 62 of file qwt_plot_seriesitem.cpp.

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

Definition at line 102 of file qwt_plot_seriesitem.cpp.

Author

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Updated 2026-06-01 - jenkler.se | uex.se