.TH "QwtPlotLegendItem" 3 "Wed Jan 2 2019" "Version 6.1.4" "Qwt User's Guide" \" -*- nroff -*-
.ad l
.nh
.SH NAME
QwtPlotLegendItem \- A class which draws a legend inside the plot canvas\&.  

.SH SYNOPSIS
.br
.PP
.PP
\fC#include <qwt_plot_legenditem\&.h>\fP
.PP
Inherits \fBQwtPlotItem\fP\&.
.SS "Public Types"

.in +1c
.ti -1c
.RI "enum \fBBackgroundMode\fP { \fBLegendBackground\fP, \fBItemBackground\fP }"
.br
.RI "Background mode\&. "
.in -1c
.SS "Public Member Functions"

.in +1c
.ti -1c
.RI "\fBQwtPlotLegendItem\fP ()"
.br
.RI "Constructor\&. "
.ti -1c
.RI "virtual \fB~QwtPlotLegendItem\fP ()"
.br
.RI "Destructor\&. "
.ti -1c
.RI "virtual int \fBrtti\fP () const"
.br
.ti -1c
.RI "void \fBsetAlignment\fP (Qt::Alignment)"
.br
.RI "Set the alignmnet\&. "
.ti -1c
.RI "Qt::Alignment \fBalignment\fP () const"
.br
.ti -1c
.RI "void \fBsetMaxColumns\fP (uint)"
.br
.RI "Limit the number of columns\&. "
.ti -1c
.RI "uint \fBmaxColumns\fP () const"
.br
.ti -1c
.RI "void \fBsetMargin\fP (int)"
.br
.RI "Set the margin around legend items\&. "
.ti -1c
.RI "int \fBmargin\fP () const"
.br
.ti -1c
.RI "void \fBsetSpacing\fP (int)"
.br
.RI "Set the spacing between the legend items\&. "
.ti -1c
.RI "int \fBspacing\fP () const"
.br
.ti -1c
.RI "void \fBsetItemMargin\fP (int)"
.br
.ti -1c
.RI "int \fBitemMargin\fP () const"
.br
.ti -1c
.RI "void \fBsetItemSpacing\fP (int)"
.br
.ti -1c
.RI "int \fBitemSpacing\fP () const"
.br
.ti -1c
.RI "void \fBsetFont\fP (const QFont &)"
.br
.ti -1c
.RI "QFont \fBfont\fP () const"
.br
.ti -1c
.RI "void \fBsetBorderDistance\fP (int)"
.br
.RI "Set the margin between the legend and the canvas border\&. "
.ti -1c
.RI "int \fBborderDistance\fP () const"
.br
.ti -1c
.RI "void \fBsetBorderRadius\fP (double)"
.br
.ti -1c
.RI "double \fBborderRadius\fP () const"
.br
.ti -1c
.RI "void \fBsetBorderPen\fP (const QPen &)"
.br
.ti -1c
.RI "QPen \fBborderPen\fP () const"
.br
.ti -1c
.RI "void \fBsetBackgroundBrush\fP (const QBrush &)"
.br
.RI "Set the background brush\&. "
.ti -1c
.RI "QBrush \fBbackgroundBrush\fP () const"
.br
.ti -1c
.RI "void \fBsetBackgroundMode\fP (\fBBackgroundMode\fP)"
.br
.RI "Set the background mode\&. "
.ti -1c
.RI "\fBBackgroundMode\fP \fBbackgroundMode\fP () const"
.br
.ti -1c
.RI "void \fBsetTextPen\fP (const QPen &)"
.br
.RI "Set the pen for drawing text labels\&. "
.ti -1c
.RI "QPen \fBtextPen\fP () const"
.br
.ti -1c
.RI "virtual void \fBdraw\fP (QPainter *, const \fBQwtScaleMap\fP &xMap, const \fBQwtScaleMap\fP &yMap, const QRectF &canvasRect) const"
.br
.ti -1c
.RI "void \fBclearLegend\fP ()"
.br
.RI "Remove all items from the legend\&. "
.ti -1c
.RI "virtual void \fBupdateLegend\fP (const \fBQwtPlotItem\fP *, const QList< \fBQwtLegendData\fP > &)"
.br
.ti -1c
.RI "virtual QRect \fBgeometry\fP (const QRectF &canvasRect) const"
.br
.ti -1c
.RI "virtual QSize \fBminimumSize\fP (const \fBQwtLegendData\fP &) const"
.br
.ti -1c
.RI "virtual int \fBheightForWidth\fP (const \fBQwtLegendData\fP &, int width) const"
.br
.ti -1c
.RI "QList< const \fBQwtPlotItem\fP *> \fBplotItems\fP () const"
.br
.ti -1c
.RI "QList< QRect > \fBlegendGeometries\fP (const \fBQwtPlotItem\fP *) const"
.br
.in -1c
.SS "Protected Member Functions"

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.ti -1c
.RI "virtual void \fBdrawLegendData\fP (QPainter *painter, const \fBQwtPlotItem\fP *, const \fBQwtLegendData\fP &, const QRectF &) const"
.br
.ti -1c
.RI "virtual void \fBdrawBackground\fP (QPainter *, const QRectF &rect) const"
.br
.in -1c
.SH "Detailed Description"
.PP 
A class which draws a legend inside the plot canvas\&. 

\fBQwtPlotLegendItem\fP can be used to draw a inside the plot canvas\&. It can be used together with a \fBQwtLegend\fP or instead of it to have more space for the plot canvas\&.
.PP
In opposite to \fBQwtLegend\fP the legend item is not interactive\&. To identify mouse clicks on a legend item an event filter needs to be installed catching mouse events ob the plot canvas\&. The geometries of the legend items are available using \fBlegendGeometries()\fP\&.
.PP
The legend item is aligned to plot canvas according to its \fBalignment()\fP flags\&. It might have a background for the complete legend ( usually semi transparent ) or for each legend item\&.
.PP
\fBNote:\fP
.RS 4
An external \fBQwtLegend\fP with a transparent background on top the plot canvas might be another option with a similar effect\&. 
.RE
.PP

.SH "Member Enumeration Documentation"
.PP 
.SS "enum \fBQwtPlotLegendItem::BackgroundMode\fP"

.PP
Background mode\&. Depending on the mode the complete legend or each item might have an background\&.
.PP
The default setting is LegendBackground\&.
.PP
\fBSee also:\fP
.RS 4
\fBsetBackgroundMode()\fP, \fBsetBackgroundBrush()\fP, \fBdrawBackground()\fP 
.RE
.PP

.PP
\fBEnumerator\fP
.in +1c
.TP
\fB\fILegendBackground \fP\fP
The legend has a background\&. 
.TP
\fB\fIItemBackground \fP\fP
Each item has a background\&. 
.SH "Member Function Documentation"
.PP 
.SS "Qt::Alignment QwtPlotLegendItem::alignment () const"

.PP
\fBReturns:\fP
.RS 4
Alignment flags 
.RE
.PP
\fBSee also:\fP
.RS 4
\fBsetAlignment()\fP 
.RE
.PP

.SS "QBrush QwtPlotLegendItem::backgroundBrush () const"

.PP
\fBReturns:\fP
.RS 4
Brush is used to fill the background 
.RE
.PP
\fBSee also:\fP
.RS 4
\fBsetBackgroundBrush()\fP, \fBbackgroundMode()\fP, \fBdrawBackground()\fP 
.RE
.PP

.SS "\fBQwtPlotLegendItem::BackgroundMode\fP QwtPlotLegendItem::backgroundMode () const"

.PP
\fBReturns:\fP
.RS 4
backgroundMode 
.RE
.PP
\fBSee also:\fP
.RS 4
\fBsetBackgroundMode()\fP, \fBbackgroundBrush()\fP, \fBdrawBackground()\fP 
.RE
.PP

.SS "int QwtPlotLegendItem::borderDistance () const"

.PP
\fBReturns:\fP
.RS 4
Margin between the legend and the canvas border 
.RE
.PP
\fBSee also:\fP
.RS 4
\fBmargin()\fP 
.RE
.PP

.SS "QPen QwtPlotLegendItem::borderPen () const"

.PP
\fBReturns:\fP
.RS 4
Pen for drawing the border 
.RE
.PP
\fBSee also:\fP
.RS 4
\fBsetBorderPen()\fP, \fBbackgroundBrush()\fP 
.RE
.PP

.SS "double QwtPlotLegendItem::borderRadius () const"

.PP
\fBReturns:\fP
.RS 4
Radius of the border 
.RE
.PP
\fBSee also:\fP
.RS 4
\fBsetBorderRadius()\fP, \fBsetBorderPen()\fP 
.RE
.PP

.SS "void QwtPlotLegendItem::draw (QPainter * painter, const \fBQwtScaleMap\fP & xMap, const \fBQwtScaleMap\fP & yMap, const QRectF & canvasRect) const\fC [virtual]\fP"
Draw the legend
.PP
\fBParameters:\fP
.RS 4
\fIpainter\fP Painter 
.br
\fIxMap\fP x Scale Map 
.br
\fIyMap\fP y Scale Map 
.br
\fIcanvasRect\fP Contents rectangle of the canvas in painter coordinates 
.RE
.PP

.PP
Implements \fBQwtPlotItem\fP\&.
.SS "void QwtPlotLegendItem::drawBackground (QPainter * painter, const QRectF & rect) const\fC [protected]\fP, \fC [virtual]\fP"
Draw a rounded rect
.PP
\fBParameters:\fP
.RS 4
\fIpainter\fP Painter 
.br
\fIrect\fP Bounding rectangle
.RE
.PP
\fBSee also:\fP
.RS 4
\fBsetBorderRadius()\fP, \fBsetBorderPen()\fP, \fBsetBackgroundBrush()\fP, \fBsetBackgroundMode()\fP 
.RE
.PP

.SS "void QwtPlotLegendItem::drawLegendData (QPainter * painter, const \fBQwtPlotItem\fP * plotItem, const \fBQwtLegendData\fP & data, const QRectF & rect) const\fC [protected]\fP, \fC [virtual]\fP"
Draw an entry on the legend
.PP
\fBParameters:\fP
.RS 4
\fIpainter\fP Qt Painter 
.br
\fIplotItem\fP Plot item, represented by the entry 
.br
\fIdata\fP Attributes of the legend entry 
.br
\fIrect\fP Bounding rectangle for the entry 
.RE
.PP

.SS "QFont QwtPlotLegendItem::font () const"

.PP
\fBReturns:\fP
.RS 4
Font used for drawing the text label 
.RE
.PP
\fBSee also:\fP
.RS 4
\fBsetFont()\fP 
.RE
.PP

.SS "QRect QwtPlotLegendItem::geometry (const QRectF & canvasRect) const\fC [virtual]\fP"
Calculate the geometry of the legend on the canvas
.PP
\fBParameters:\fP
.RS 4
\fIcanvasRect\fP Geometry of the canvas 
.RE
.PP
\fBReturns:\fP
.RS 4
Geometry of the legend 
.RE
.PP

.SS "int QwtPlotLegendItem::heightForWidth (const \fBQwtLegendData\fP & data, int width) const\fC [virtual]\fP"

.PP
\fBReturns:\fP
.RS 4
The preferred height, for a width\&. 
.RE
.PP
\fBParameters:\fP
.RS 4
\fIdata\fP Attributes of the legend entry 
.br
\fIwidth\fP Width 
.RE
.PP

.SS "int QwtPlotLegendItem::itemMargin () const"

.PP
\fBReturns:\fP
.RS 4
Margin around each item 
.RE
.PP
\fBSee also:\fP
.RS 4
\fBsetItemMargin()\fP, \fBitemSpacing()\fP, \fBmargin()\fP, \fBspacing()\fP 
.RE
.PP

.SS "int QwtPlotLegendItem::itemSpacing () const"

.PP
\fBReturns:\fP
.RS 4
Spacing inside of each item 
.RE
.PP
\fBSee also:\fP
.RS 4
\fBsetItemSpacing()\fP, \fBitemMargin()\fP, \fBmargin()\fP, \fBspacing()\fP 
.RE
.PP

.SS "QList< QRect > QwtPlotLegendItem::legendGeometries (const \fBQwtPlotItem\fP * plotItem) const"

.PP
\fBReturns:\fP
.RS 4
Geometries of the items of a plot item 
.RE
.PP
\fBNote:\fP
.RS 4
Usually a plot item has only one entry on the legend 
.RE
.PP

.SS "int QwtPlotLegendItem::margin () const"

.PP
\fBReturns:\fP
.RS 4
Margin around the legend items 
.RE
.PP
\fBSee also:\fP
.RS 4
\fBsetMargin()\fP, \fBspacing()\fP, \fBitemMargin()\fP, \fBitemSpacing()\fP 
.RE
.PP

.SS "uint QwtPlotLegendItem::maxColumns () const"

.PP
\fBReturns:\fP
.RS 4
Maximum number of columns 
.RE
.PP
\fBSee also:\fP
.RS 4
\fBmaxColumns()\fP, \fBQwtDynGridLayout::maxColumns()\fP 
.RE
.PP

.SS "QSize QwtPlotLegendItem::minimumSize (const \fBQwtLegendData\fP & data) const\fC [virtual]\fP"
Minimum size hint needed to display an entry
.PP
\fBParameters:\fP
.RS 4
\fIdata\fP Attributes of the legend entry 
.RE
.PP
\fBReturns:\fP
.RS 4
Minimum size 
.RE
.PP

.SS "QList< const \fBQwtPlotItem\fP *> QwtPlotLegendItem::plotItems () const"

.PP
\fBReturns:\fP
.RS 4
All plot items with an entry on the legend 
.RE
.PP
\fBNote:\fP
.RS 4
A plot item might have more than one entry on the legend 
.RE
.PP

.SS "int QwtPlotLegendItem::rtti () const\fC [virtual]\fP"

.PP
\fBReturns:\fP
.RS 4
\fBQwtPlotItem::Rtti_PlotLegend\fP 
.RE
.PP

.PP
Reimplemented from \fBQwtPlotItem\fP\&.
.SS "void QwtPlotLegendItem::setAlignment (Qt::Alignment alignment)"

.PP
Set the alignmnet\&. Alignment means the position of the legend relative to the geometry of the plot canvas\&.
.PP
\fBParameters:\fP
.RS 4
\fIalignment\fP Alignment flags
.RE
.PP
\fBSee also:\fP
.RS 4
\fBalignment()\fP, \fBsetMaxColumns()\fP
.RE
.PP
\fBNote:\fP
.RS 4
To align a legend with many items horizontally the number of columns need to be limited 
.RE
.PP

.SS "void QwtPlotLegendItem::setBackgroundBrush (const QBrush & brush)"

.PP
Set the background brush\&. The brush is used to fill the background
.PP
\fBParameters:\fP
.RS 4
\fIbrush\fP Brush 
.RE
.PP
\fBSee also:\fP
.RS 4
\fBbackgroundBrush()\fP, \fBsetBackgroundMode()\fP, \fBdrawBackground()\fP 
.RE
.PP

.SS "void QwtPlotLegendItem::setBackgroundMode (\fBBackgroundMode\fP mode)"

.PP
Set the background mode\&. Depending on the mode the complete legend or each item might have an background\&.
.PP
The default setting is LegendBackground\&.
.PP
\fBSee also:\fP
.RS 4
\fBbackgroundMode()\fP, \fBsetBackgroundBrush()\fP, \fBdrawBackground()\fP 
.RE
.PP

.SS "void QwtPlotLegendItem::setBorderDistance (int distance)"

.PP
Set the margin between the legend and the canvas border\&. The default setting for the margin is 10 pixels\&.
.PP
\fBParameters:\fP
.RS 4
\fIdistance\fP Margin in pixels 
.RE
.PP
\fBSee also:\fP
.RS 4
\fBsetMargin()\fP 
.RE
.PP

.SS "void QwtPlotLegendItem::setBorderPen (const QPen & pen)"
Set the pen for drawing the border
.PP
\fBParameters:\fP
.RS 4
\fIpen\fP Border pen 
.RE
.PP
\fBSee also:\fP
.RS 4
\fBborderPen()\fP, \fBsetBackgroundBrush()\fP 
.RE
.PP

.SS "void QwtPlotLegendItem::setBorderRadius (double radius)"
Set the radius for the border
.PP
\fBParameters:\fP
.RS 4
\fIradius\fP A value <= 0 defines a rectangular border 
.RE
.PP
\fBSee also:\fP
.RS 4
\fBborderRadius()\fP, \fBsetBorderPen()\fP 
.RE
.PP

.SS "void QwtPlotLegendItem::setFont (const QFont & font)"
Change the font used for drawing the text label
.PP
\fBParameters:\fP
.RS 4
\fIfont\fP Legend font 
.RE
.PP
\fBSee also:\fP
.RS 4
\fBfont()\fP 
.RE
.PP

.SS "void QwtPlotLegendItem::setItemMargin (int margin)"
Set the margin around each item
.PP
\fBParameters:\fP
.RS 4
\fImargin\fP Margin 
.RE
.PP
\fBSee also:\fP
.RS 4
\fBitemMargin()\fP, \fBsetItemSpacing()\fP, \fBsetMargin()\fP, \fBsetSpacing()\fP 
.RE
.PP

.SS "void QwtPlotLegendItem::setItemSpacing (int spacing)"
Set the spacing inside of each item
.PP
\fBParameters:\fP
.RS 4
\fIspacing\fP Spacing 
.RE
.PP
\fBSee also:\fP
.RS 4
\fBitemSpacing()\fP, \fBsetItemMargin()\fP, \fBsetMargin()\fP, \fBsetSpacing()\fP 
.RE
.PP

.SS "void QwtPlotLegendItem::setMargin (int margin)"

.PP
Set the margin around legend items\&. The default setting for the margin is 0\&.
.PP
\fBParameters:\fP
.RS 4
\fImargin\fP Margin in pixels 
.RE
.PP
\fBSee also:\fP
.RS 4
\fBmargin()\fP, \fBsetSpacing()\fP, \fBsetItemMargin()\fP, \fBsetItemSpacing\fP 
.RE
.PP

.SS "void QwtPlotLegendItem::setMaxColumns (uint maxColumns)"

.PP
Limit the number of columns\&. When aligning the legend horizontally ( Qt::AlignLeft, Qt::AlignRight ) the number of columns needs to be limited to avoid, that the width of the legend grows with an increasing number of entries\&.
.PP
\fBParameters:\fP
.RS 4
\fImaxColumns\fP Maximum number of columns\&. 0 means unlimited\&. 
.RE
.PP
\fBSee also:\fP
.RS 4
\fBmaxColumns()\fP, \fBQwtDynGridLayout::setMaxColumns()\fP 
.RE
.PP

.SS "void QwtPlotLegendItem::setSpacing (int spacing)"

.PP
Set the spacing between the legend items\&. 
.PP
\fBParameters:\fP
.RS 4
\fIspacing\fP Spacing in pixels 
.RE
.PP
\fBSee also:\fP
.RS 4
\fBspacing()\fP, \fBsetMargin()\fP 
.RE
.PP

.SS "void QwtPlotLegendItem::setTextPen (const QPen & pen)"

.PP
Set the pen for drawing text labels\&. 
.PP
\fBParameters:\fP
.RS 4
\fIpen\fP Text pen 
.RE
.PP
\fBSee also:\fP
.RS 4
\fBtextPen()\fP, \fBsetFont()\fP 
.RE
.PP

.SS "int QwtPlotLegendItem::spacing () const"

.PP
\fBReturns:\fP
.RS 4
Spacing between the legend items 
.RE
.PP
\fBSee also:\fP
.RS 4
\fBsetSpacing()\fP, \fBmargin()\fP, \fBitemSpacing()\fP, \fBitemMargin()\fP 
.RE
.PP

.SS "QPen QwtPlotLegendItem::textPen () const"

.PP
\fBReturns:\fP
.RS 4
Pen for drawing text labels 
.RE
.PP
\fBSee also:\fP
.RS 4
\fBsetTextPen()\fP, \fBfont()\fP 
.RE
.PP

.SS "void QwtPlotLegendItem::updateLegend (const \fBQwtPlotItem\fP * plotItem, const QList< \fBQwtLegendData\fP > & data)\fC [virtual]\fP"
Update the legend items according to modifications of a plot item
.PP
\fBParameters:\fP
.RS 4
\fIplotItem\fP Plot item 
.br
\fIdata\fP Attributes of the legend entries 
.RE
.PP

.PP
Reimplemented from \fBQwtPlotItem\fP\&.

.SH "Author"
.PP 
Generated automatically by Doxygen for Qwt User's Guide from the source code\&.