QwtPlotTextLabel - A plot item, which displays a text label.
NAME SYNOPSIS Public Member Functions Protected Member Functions Additional Inherited Members Detailed Description Constructor & Destructor Documentation QwtPlotTextLabel::QwtPlotTextLabel () QwtPlotTextLabel::˜QwtPlotTextLabel () [virtual] Member Function Documentation void QwtPlotTextLabel::draw (QPainter * painter, const QwtScaleMap & xMap,const QwtScaleMap & yMap, const QRectF & canvasRect) const [override],[protected], [virtual] void QwtPlotTextLabel::invalidateCache () [protected] int QwtPlotTextLabel::margin () const int QwtPlotTextLabel::rtti () const [override], [virtual] void QwtPlotTextLabel::setMargin (int margin) void QwtPlotTextLabel::setText (const QwtText & text) QwtText QwtPlotTextLabel::text () const QRectF QwtPlotTextLabel::textRect (const QRectF & rect, const QSizeF &textSize) const [virtual] AuthorNAME
QwtPlotTextLabel − A plot item, which displays a text label.
SYNOPSIS
#include <qwt_plot_textlabel.h>
Inherits QwtPlotItem.
Public Member Functions
QwtPlotTextLabel
()
Constructor.
virtual ˜QwtPlotTextLabel ()
Destructor.
virtual int rtti () const override
void setText (const QwtText &)
QwtText text () const
void setMargin (int margin)
int margin () const
virtual QRectF textRect (const QRectF &, const
QSizeF &) const
Align the text label.
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 QRectF boundingRect () const
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
Protected Member Functions
virtual void
draw (QPainter *, const QwtScaleMap &,
const QwtScaleMap &, const QRectF &) const
override
void invalidateCache ()
Invalidate all internal cache.
Protected Member Functions inherited from QwtPlotItem
QwtGraphic defaultIcon
(const QBrush &, const QSizeF &) const
Return a default icon from a brush.
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
A plot item, which displays a text label.
QwtPlotTextLabel displays a text label aligned to the plot canvas.
In opposite to QwtPlotMarker the position of the label is unrelated to plot coordinates.
As drawing a text is an expensive operation the label is cached in a pixmap to speed up replots.
Example
The following code shows how to add a title.
QwtText title(
"Plot Title" );
title.setRenderFlags( Qt::AlignHCenter | Qt::AlignTop );
QFont font;
font.setBold( true );
title.setFont( font );
QwtPlotTextLabel
*titleItem = new QwtPlotTextLabel();
titleItem−>setText( title );
titleItem−>attach( plot );
See also
QwtPlotMarker
Definition at line 47 of file qwt_plot_textlabel.h.
Constructor & Destructor Documentation
QwtPlotTextLabel::QwtPlotTextLabel ()
Constructor. Initializes an text label with an empty text
Sets the following item attributes:
|
• |
QwtPlotItem::AutoScale: true |
|||
|
• |
QwtPlotItem::Legend: false |
The z value is initialized by 150
See also
QwtPlotItem::setItemAttribute(), QwtPlotItem::setZ()
Definition at line 82 of file qwt_plot_textlabel.cpp.
QwtPlotTextLabel::˜QwtPlotTextLabel () [virtual]
Destructor.
Definition at line 94 of file qwt_plot_textlabel.cpp.
Member Function Documentation
void QwtPlotTextLabel::draw (QPainter * painter, const QwtScaleMap & xMap,const QwtScaleMap & yMap, const QRectF & canvasRect) const [override],[protected], [virtual]
Draw the text label
Parameters
painter Painter
xMap x Scale Map
yMap y Scale Map
canvasRect Contents rectangle of the canvas in painter
coordinates
See also
textRect()
Implements QwtPlotItem.
Definition at line 176 of file qwt_plot_textlabel.cpp.
void QwtPlotTextLabel::invalidateCache () [protected]
Invalidate all internal cache.
Definition at line 270 of file qwt_plot_textlabel.cpp.
int QwtPlotTextLabel::margin () const
Returns
Margin added to the contentsMargins() of the canvas
See also
setMargin()
Definition at line 160 of file qwt_plot_textlabel.cpp.
int QwtPlotTextLabel::rtti () const [override], [virtual]
Returns
QwtPlotItem::Rtti_PlotTextLabel
Reimplemented from QwtPlotItem.
Definition at line 100 of file qwt_plot_textlabel.cpp.
void QwtPlotTextLabel::setMargin (int margin)
Set the margin
The margin is the distance between the contentsRect() of the plot canvas and the rectangle where the label can be displayed.
Parameters
margin Margin
See also
margin(), textRect()
Definition at line 146 of file qwt_plot_textlabel.cpp.
void QwtPlotTextLabel::setText (const QwtText & text)
Set the text
The label will be aligned to the plot canvas according to the alignment flags of text.
Parameters
text Text to be displayed
See also
text(), QwtText::renderFlags()
Definition at line 115 of file qwt_plot_textlabel.cpp.
QwtText QwtPlotTextLabel::text () const
Returns
Text to be displayed
See also
setText()
Definition at line 130 of file qwt_plot_textlabel.cpp.
QRectF QwtPlotTextLabel::textRect (const QRectF & rect, const QSizeF &textSize) const [virtual]
Align the text label.
Parameters
rect Canvas rectangle
with margins subtracted
textSize Size required to draw the text
Returns
A rectangle aligned according the the alignment flags of the text.
See also
setMargin(), QwtText::renderFlags(), QwtText::textSize()
Definition at line 263 of file qwt_plot_textlabel.cpp.
Author
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