813 lines
17 KiB
Groff
813 lines
17 KiB
Groff
.TH "QwtPlotLegendItem" 3 "Sun Jul 18 2021" "Version 6.2.0" "Qwt User's Guide" \" -*- nroff -*-
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.ad l
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.nh
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.SH NAME
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QwtPlotLegendItem \- A class which draws a legend inside the plot canvas\&.
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.SH SYNOPSIS
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.br
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.PP
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.PP
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\fC#include <qwt_plot_legenditem\&.h>\fP
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.PP
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Inherits \fBQwtPlotItem\fP\&.
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.SS "Public Types"
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.in +1c
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.ti -1c
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.RI "enum \fBBackgroundMode\fP { \fBLegendBackground\fP, \fBItemBackground\fP }"
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.RI "Background mode\&. "
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.SS "Public Member Functions"
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.RI "\fBQwtPlotLegendItem\fP ()"
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.br
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.RI "Constructor\&. "
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.RI "virtual \fB~QwtPlotLegendItem\fP ()"
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.RI "Destructor\&. "
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.RI "virtual int \fBrtti\fP () const override"
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.RI "void \fBsetAlignmentInCanvas\fP (Qt::Alignment)"
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.RI "Set the alignmnet\&. "
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.RI "Qt::Alignment \fBalignmentInCanvas\fP () const"
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.RI "void \fBsetOffsetInCanvas\fP (Qt::Orientations, int numPixels)"
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.RI "Set the distance between the legend and the canvas border\&. "
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.RI "int \fBoffsetInCanvas\fP (Qt::Orientation) const"
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.RI "void \fBsetMaxColumns\fP (uint)"
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.RI "Limit the number of columns\&. "
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.RI "uint \fBmaxColumns\fP () const"
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.RI "void \fBsetMargin\fP (int)"
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.RI "Set the margin around legend items\&. "
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.RI "int \fBmargin\fP () const"
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.RI "void \fBsetSpacing\fP (int)"
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.RI "Set the spacing between the legend items\&. "
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.RI "int \fBspacing\fP () const"
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.RI "void \fBsetItemMargin\fP (int)"
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.RI "int \fBitemMargin\fP () const"
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.RI "void \fBsetItemSpacing\fP (int)"
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.RI "int \fBitemSpacing\fP () const"
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.RI "void \fBsetFont\fP (const QFont &)"
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.RI "QFont \fBfont\fP () const"
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.RI "void \fBsetBorderRadius\fP (double)"
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.RI "double \fBborderRadius\fP () const"
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.RI "void \fBsetBorderPen\fP (const QPen &)"
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.RI "QPen \fBborderPen\fP () const"
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.RI "void \fBsetBackgroundBrush\fP (const QBrush &)"
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.RI "Set the background brush\&. "
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.RI "QBrush \fBbackgroundBrush\fP () const"
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.RI "void \fBsetBackgroundMode\fP (\fBBackgroundMode\fP)"
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.RI "Set the background mode\&. "
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.RI "\fBBackgroundMode\fP \fBbackgroundMode\fP () const"
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.RI "void \fBsetTextPen\fP (const QPen &)"
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.RI "Set the pen for drawing text labels\&. "
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.RI "QPen \fBtextPen\fP () const"
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.RI "virtual void \fBdraw\fP (QPainter *, const \fBQwtScaleMap\fP &xMap, const \fBQwtScaleMap\fP &yMap, const QRectF &canvasRect) const override"
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.br
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.RI "void \fBclearLegend\fP ()"
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.RI "Remove all items from the legend\&. "
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.ti -1c
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.RI "virtual void \fBupdateLegend\fP (const \fBQwtPlotItem\fP *, const \fBQList\fP< \fBQwtLegendData\fP > &) override"
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.RI "virtual QRect \fBgeometry\fP (const QRectF &canvasRect) const"
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.RI "virtual QSize \fBminimumSize\fP (const \fBQwtLegendData\fP &) const"
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.RI "virtual int \fBheightForWidth\fP (const \fBQwtLegendData\fP &, int width) const"
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.br
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.RI "\fBQList\fP< const \fBQwtPlotItem\fP * > \fBplotItems\fP () const"
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.br
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.ti -1c
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.RI "\fBQList\fP< QRect > \fBlegendGeometries\fP (const \fBQwtPlotItem\fP *) const"
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.br
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.SS "Protected Member Functions"
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.RI "virtual void \fBdrawLegendData\fP (QPainter *, const \fBQwtPlotItem\fP *, const \fBQwtLegendData\fP &, const QRectF &) const"
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.br
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.RI "virtual void \fBdrawBackground\fP (QPainter *, const QRectF &rect) const"
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.br
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.in -1c
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.SH "Detailed Description"
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.PP
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A class which draws a legend inside the plot canvas\&.
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\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\&.
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.PP
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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\&.
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.PP
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The legend item is aligned to plot canvas according to its alignment() flags\&. It might have a background for the complete legend ( usually semi transparent ) or for each legend item\&.
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.PP
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\fBNote\fP
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.RS 4
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An external \fBQwtLegend\fP with a transparent background on top the plot canvas might be another option with a similar effect\&.
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.RE
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.PP
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.PP
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Definition at line 41 of file qwt_plot_legenditem\&.h\&.
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.SH "Member Enumeration Documentation"
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.PP
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.SS "enum \fBQwtPlotLegendItem::BackgroundMode\fP"
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.PP
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Background mode\&. Depending on the mode the complete legend or each item might have an background\&.
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.PP
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The default setting is LegendBackground\&.
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.PP
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\fBSee also\fP
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.RS 4
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\fBsetBackgroundMode()\fP, \fBsetBackgroundBrush()\fP, \fBdrawBackground()\fP
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.RE
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.PP
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.PP
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\fBEnumerator\fP
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.in +1c
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.TP
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\fB\fILegendBackground \fP\fP
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The legend has a background\&.
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.TP
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\fB\fIItemBackground \fP\fP
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Each item has a background\&.
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.PP
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Definition at line 54 of file qwt_plot_legenditem\&.h\&.
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.SH "Member Function Documentation"
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.PP
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.SS "Qt::Alignment QwtPlotLegendItem::alignmentInCanvas () const"
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.PP
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\fBReturns\fP
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.RS 4
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Alignment flags
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.RE
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.PP
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\fBSee also\fP
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.RS 4
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\fBsetAlignmentInCanvas()\fP
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.RE
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.PP
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.PP
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Definition at line 223 of file qwt_plot_legenditem\&.cpp\&.
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.SS "QBrush QwtPlotLegendItem::backgroundBrush () const"
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.PP
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\fBReturns\fP
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.RS 4
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Brush is used to fill the background
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.RE
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.PP
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\fBSee also\fP
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.RS 4
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\fBsetBackgroundBrush()\fP, \fBbackgroundMode()\fP, \fBdrawBackground()\fP
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.RE
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Definition at line 522 of file qwt_plot_legenditem\&.cpp\&.
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.SS "\fBQwtPlotLegendItem::BackgroundMode\fP QwtPlotLegendItem::backgroundMode () const"
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.PP
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\fBReturns\fP
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.RS 4
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backgroundMode
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.RE
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.PP
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\fBSee also\fP
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.RS 4
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\fBsetBackgroundMode()\fP, \fBbackgroundBrush()\fP, \fBdrawBackground()\fP
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.RE
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.PP
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Definition at line 550 of file qwt_plot_legenditem\&.cpp\&.
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.SS "QPen QwtPlotLegendItem::borderPen () const"
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.PP
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\fBReturns\fP
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.RS 4
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Pen for drawing the border
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.RE
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.PP
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\fBSee also\fP
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.RS 4
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\fBsetBorderPen()\fP, \fBbackgroundBrush()\fP
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.RE
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.PP
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Definition at line 496 of file qwt_plot_legenditem\&.cpp\&.
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.SS "double QwtPlotLegendItem::borderRadius () const"
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.PP
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\fBReturns\fP
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.RS 4
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Radius of the border
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.RE
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.PP
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\fBSee also\fP
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.RS 4
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\fBsetBorderRadius()\fP, \fBsetBorderPen()\fP
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.RE
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.PP
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Definition at line 472 of file qwt_plot_legenditem\&.cpp\&.
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.SS "void QwtPlotLegendItem::draw (QPainter * painter, const \fBQwtScaleMap\fP & xMap, const \fBQwtScaleMap\fP & yMap, const QRectF & canvasRect) const\fC [override]\fP, \fC [virtual]\fP"
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Draw the legend
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.PP
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\fBParameters\fP
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.RS 4
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\fIpainter\fP Painter
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\fIxMap\fP x Scale Map
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\fIyMap\fP y Scale Map
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\fIcanvasRect\fP Contents rectangle of the canvas in painter coordinates
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.RE
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.PP
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.PP
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Implements \fBQwtPlotItem\fP\&.
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.PP
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Definition at line 587 of file qwt_plot_legenditem\&.cpp\&.
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.SS "void QwtPlotLegendItem::drawBackground (QPainter * painter, const QRectF & rect) const\fC [protected]\fP, \fC [virtual]\fP"
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Draw a rounded rect
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.PP
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\fBParameters\fP
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.RS 4
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\fIpainter\fP Painter
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\fIrect\fP Bounding rectangle
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.RE
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\fBSee also\fP
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.RS 4
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\fBsetBorderRadius()\fP, \fBsetBorderPen()\fP, \fBsetBackgroundBrush()\fP, \fBsetBackgroundMode()\fP
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.RE
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.PP
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Definition at line 630 of file qwt_plot_legenditem\&.cpp\&.
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.SS "void QwtPlotLegendItem::drawLegendData (QPainter * painter, const \fBQwtPlotItem\fP * plotItem, const \fBQwtLegendData\fP & data, const QRectF & rect) const\fC [protected]\fP, \fC [virtual]\fP"
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Draw an entry on the legend
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.PP
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\fBParameters\fP
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.RS 4
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\fIpainter\fP Qt Painter
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\fIplotItem\fP Plot item, represented by the entry
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\fIdata\fP Attributes of the legend entry
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\fIrect\fP Bounding rectangle for the entry
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.RE
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Definition at line 780 of file qwt_plot_legenditem\&.cpp\&.
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.SS "QFont QwtPlotLegendItem::font () const"
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.PP
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\fBReturns\fP
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.RS 4
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Font used for drawing the text label
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.RE
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.PP
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\fBSee also\fP
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.RS 4
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\fBsetFont()\fP
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.RE
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.PP
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Definition at line 389 of file qwt_plot_legenditem\&.cpp\&.
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.SS "QRect QwtPlotLegendItem::geometry (const QRectF & canvasRect) const\fC [virtual]\fP"
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Calculate the geometry of the legend on the canvas
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.PP
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\fBParameters\fP
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.RS 4
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\fIcanvasRect\fP Geometry of the canvas
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.RE
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.PP
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\fBReturns\fP
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.RS 4
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Geometry of the legend
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.RE
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.PP
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.PP
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Definition at line 650 of file qwt_plot_legenditem\&.cpp\&.
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.SS "int QwtPlotLegendItem::heightForWidth (const \fBQwtLegendData\fP & data, int width) const\fC [virtual]\fP"
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.PP
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\fBReturns\fP
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.RS 4
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The preferred height, for a width\&.
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.RE
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.PP
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\fBParameters\fP
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.RS 4
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\fIdata\fP Attributes of the legend entry
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\fIwidth\fP Width
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.RE
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Definition at line 862 of file qwt_plot_legenditem\&.cpp\&.
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.SS "int QwtPlotLegendItem::itemMargin () const"
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.PP
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\fBReturns\fP
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.RS 4
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Margin around each item
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.RE
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.PP
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\fBSee also\fP
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.RS 4
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\fBsetItemMargin()\fP, \fBitemSpacing()\fP, \fBmargin()\fP, \fBspacing()\fP
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.RE
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.PP
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Definition at line 335 of file qwt_plot_legenditem\&.cpp\&.
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.SS "int QwtPlotLegendItem::itemSpacing () const"
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.PP
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\fBReturns\fP
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.RS 4
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Spacing inside of each item
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.RE
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.PP
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\fBSee also\fP
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.RS 4
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\fBsetItemSpacing()\fP, \fBitemMargin()\fP, \fBmargin()\fP, \fBspacing()\fP
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.RE
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.PP
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Definition at line 363 of file qwt_plot_legenditem\&.cpp\&.
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.SS "\fBQList\fP< QRect > QwtPlotLegendItem::legendGeometries (const \fBQwtPlotItem\fP * plotItem) const"
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.PP
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\fBReturns\fP
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.RS 4
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Geometries of the items of a plot item
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.RE
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.PP
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\fBNote\fP
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.RS 4
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Usually a plot item has only one entry on the legend
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.RE
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.PP
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.PP
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Definition at line 895 of file qwt_plot_legenditem\&.cpp\&.
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.SS "int QwtPlotLegendItem::margin () const"
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.PP
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\fBReturns\fP
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.RS 4
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Margin around the legend items
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.RE
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.PP
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\fBSee also\fP
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.RS 4
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\fBsetMargin()\fP, \fBspacing()\fP, \fBitemMargin()\fP, \fBitemSpacing()\fP
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.RE
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.PP
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.PP
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Definition at line 280 of file qwt_plot_legenditem\&.cpp\&.
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.SS "uint QwtPlotLegendItem::maxColumns () const"
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.PP
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\fBReturns\fP
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.RS 4
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Maximum number of columns
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.RE
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.PP
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\fBSee also\fP
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.RS 4
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\fBmaxColumns()\fP, \fBQwtDynGridLayout::maxColumns()\fP
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.RE
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.PP
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.PP
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Definition at line 251 of file qwt_plot_legenditem\&.cpp\&.
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.SS "QSize QwtPlotLegendItem::minimumSize (const \fBQwtLegendData\fP & data) const\fC [virtual]\fP"
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Minimum size hint needed to display an entry
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.PP
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\fBParameters\fP
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.RS 4
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\fIdata\fP Attributes of the legend entry
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.RE
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.PP
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\fBReturns\fP
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.RS 4
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Minimum size
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.RE
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.PP
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.PP
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Definition at line 823 of file qwt_plot_legenditem\&.cpp\&.
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.SS "int QwtPlotLegendItem::offsetInCanvas (Qt::Orientation orientation) const"
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.PP
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\fBParameters\fP
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.RS 4
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\fIorientation\fP Qt::Horizontal is for the left/right, Qt::Vertical for the top/bottom padding\&.
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.RE
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.PP
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\fBReturns\fP
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.RS 4
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Distance between the legend and the canvas border
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.RE
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.PP
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\fBSee also\fP
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.RS 4
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\fBsetOffsetInCanvas()\fP
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.RE
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.PP
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.PP
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Definition at line 444 of file qwt_plot_legenditem\&.cpp\&.
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.SS "\fBQList\fP< const \fBQwtPlotItem\fP * > QwtPlotLegendItem::plotItems () const"
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.PP
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\fBReturns\fP
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All plot items with an entry on the legend
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Definition at line 886 of file qwt_plot_legenditem\&.cpp\&.
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.SS "int QwtPlotLegendItem::rtti () const\fC [override]\fP, \fC [virtual]\fP"
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Reimplemented from \fBQwtPlotItem\fP\&.
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Definition at line 192 of file qwt_plot_legenditem\&.cpp\&.
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.SS "void QwtPlotLegendItem::setAlignmentInCanvas (Qt::Alignment alignment)"
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Set the alignmnet\&. Alignment means the position of the legend relative to the geometry of the plot canvas\&.
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\fBParameters\fP
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\fIalignment\fP Alignment flags
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Definition at line 210 of file qwt_plot_legenditem\&.cpp\&.
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.SS "void QwtPlotLegendItem::setBackgroundBrush (const QBrush & brush)"
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Set the background brush\&. The brush is used to fill the background
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Definition at line 509 of file qwt_plot_legenditem\&.cpp\&.
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.SS "void QwtPlotLegendItem::setBackgroundMode (\fBBackgroundMode\fP mode)"
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Set the background mode\&. Depending on the mode the complete legend or each item might have an background\&.
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The default setting is LegendBackground\&.
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Definition at line 537 of file qwt_plot_legenditem\&.cpp\&.
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.SS "void QwtPlotLegendItem::setBorderPen (const QPen & pen)"
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Set the pen for drawing the border
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Definition at line 483 of file qwt_plot_legenditem\&.cpp\&.
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.SS "void QwtPlotLegendItem::setBorderRadius (double radius)"
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Set the radius for the border
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Definition at line 457 of file qwt_plot_legenditem\&.cpp\&.
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.SS "void QwtPlotLegendItem::setFont (const QFont & font)"
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Change the font used for drawing the text label
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\fBParameters\fP
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Definition at line 374 of file qwt_plot_legenditem\&.cpp\&.
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.SS "void QwtPlotLegendItem::setItemMargin (int margin)"
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Set the margin around each item
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Definition at line 319 of file qwt_plot_legenditem\&.cpp\&.
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.SS "void QwtPlotLegendItem::setItemSpacing (int spacing)"
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Set the spacing inside of each item
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Definition at line 346 of file qwt_plot_legenditem\&.cpp\&.
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.SS "void QwtPlotLegendItem::setMargin (int margin)"
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Set the margin around legend items\&. The default setting for the margin is 0\&.
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Definition at line 264 of file qwt_plot_legenditem\&.cpp\&.
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.SS "void QwtPlotLegendItem::setMaxColumns (uint maxColumns)"
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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\&.
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Definition at line 238 of file qwt_plot_legenditem\&.cpp\&.
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.SS "void QwtPlotLegendItem::setOffsetInCanvas (Qt::Orientations orientations, int numPixels)"
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Set the distance between the legend and the canvas border\&. The default setting is 10 pixels\&.
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\fBParameters\fP
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.br
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Definition at line 405 of file qwt_plot_legenditem\&.cpp\&.
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.SS "void QwtPlotLegendItem::setSpacing (int spacing)"
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.PP
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Set the spacing between the legend items\&.
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\fBParameters\fP
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Definition at line 294 of file qwt_plot_legenditem\&.cpp\&.
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.SS "void QwtPlotLegendItem::setTextPen (const QPen & pen)"
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Set the pen for drawing text labels\&.
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Definition at line 561 of file qwt_plot_legenditem\&.cpp\&.
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.SS "int QwtPlotLegendItem::spacing () const"
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\fBReturns\fP
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Spacing between the legend items
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\fBSee also\fP
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\fBsetSpacing()\fP, \fBmargin()\fP, \fBitemSpacing()\fP, \fBitemMargin()\fP
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Definition at line 308 of file qwt_plot_legenditem\&.cpp\&.
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.SS "QPen QwtPlotLegendItem::textPen () const"
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\fBReturns\fP
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Pen for drawing text labels
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\fBSee also\fP
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Definition at line 574 of file qwt_plot_legenditem\&.cpp\&.
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.SS "void QwtPlotLegendItem::updateLegend (const \fBQwtPlotItem\fP * plotItem, const \fBQList\fP< \fBQwtLegendData\fP > & data)\fC [override]\fP, \fC [virtual]\fP"
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Update the legend items according to modifications of a plot item
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\fBParameters\fP
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.RS 4
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\fIplotItem\fP Plot item
|
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.br
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\fIdata\fP Attributes of the legend entries
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Reimplemented from \fBQwtPlotItem\fP\&.
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Definition at line 697 of file qwt_plot_legenditem\&.cpp\&.
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.SH "Author"
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Generated automatically by Doxygen for Qwt User's Guide from the source code\&.
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