QwtPlotGraphicItem - A plot item, which displays a recorded sequence of QPainter commands.

NAME

QwtPlotGraphicItem − A plot item, which displays a recorded sequence of QPainter commands.

SYNOPSIS

#include <qwt_plot_graphicitem.h>

Inherits QwtPlotItem.

Inherited by QwtPlotSvgItem.

Public Member Functions

QwtPlotGraphicItem (const QString &title=QString())
Constructor.
QwtPlotGraphicItem (const QwtText &title)
Constructor.
virtual ˜QwtPlotGraphicItem ()
Destructor.
void setGraphic (const QRectF &rect, const QwtGraphic &)
QwtGraphic graphic () const
virtual QRectF boundingRect () const override
Bounding rectangle of the item.
virtual void draw (QPainter *, const QwtScaleMap &xMap, const QwtScaleMap &yMap, const QRectF &canvasRect) const override
virtual int rtti () const override

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

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

Protected Member Functions inherited from QwtPlotItem

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

Detailed Description

A plot item, which displays a recorded sequence of QPainter commands.

QwtPlotGraphicItem renders a sequence of recorded painter commands into a specific plot area. Recording of painter commands can be done manually by QPainter or e.g. QSvgRenderer.

See also

QwtPlotShapeItem, QwtPlotSvgItem

Definition at line 29 of file qwt_plot_graphicitem.h.

Constructor & Destructor Documentation

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

Constructor. Sets the following item attributes:

	•		QwtPlotItem::AutoScale: true
	•		QwtPlotItem::Legend: false

Parameters

title Title

Definition at line 32 of file qwt_plot_graphicitem.cpp.

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

Constructor. Sets the following item attributes:

	•		QwtPlotItem::AutoScale: true
	•		QwtPlotItem::Legend: false

Parameters

title Title

Definition at line 47 of file qwt_plot_graphicitem.cpp.

QwtPlotGraphicItem::˜QwtPlotGraphicItem () [virtual]

Destructor.

Definition at line 54 of file qwt_plot_graphicitem.cpp.

Member Function Documentation

QRectF QwtPlotGraphicItem::boundingRect () const [override], [virtual]

Bounding rectangle of the item.

Reimplemented from QwtPlotItem.

Definition at line 102 of file qwt_plot_graphicitem.cpp.

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

Draw the item

Parameters

painter Painter
xMap X-Scale Map
yMap Y-Scale Map
canvasRect Contents rect of the plot canvas

Implements QwtPlotItem.

Definition at line 115 of file qwt_plot_graphicitem.cpp.

QwtGraphic QwtPlotGraphicItem::graphic () const

Returns

Recorded sequence of painter commands

See also

setGraphic()

Definition at line 96 of file qwt_plot_graphicitem.cpp.

int QwtPlotGraphicItem::rtti () const [override], [virtual]

Returns

QwtPlotItem::Rtti_PlotGraphic

Reimplemented from QwtPlotItem.

Definition at line 71 of file qwt_plot_graphicitem.cpp.

void QwtPlotGraphicItem::setGraphic (const QRectF & rect, const QwtGraphic& graphic)

Set the graphic to be displayed

Parameters

rect Rectangle in plot coordinates
graphic Recorded sequence of painter commands

Definition at line 82 of file qwt_plot_graphicitem.cpp.

Author

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