QwtPlotLegendItem - A class which draws a legend inside the plot canvas.

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Version 6.1.4                                    Wed Jan 2 2019                             QwtPlotLegendItem(3)

       A class which draws a legend inside the plot canvas.

       QwtPlotLegendItem can be used to draw a inside the plot canvas. It can be used together with a QwtLegend
       or instead of it to have more space for the plot canvas.

       In opposite to QwtLegend 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 legendGeometries().

       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.

       Note:
           An external QwtLegend with a transparent background on top the plot canvas might be another option
           with a similar effect.

enumQwtPlotLegendItem::BackgroundMode
       Background mode. Depending on the mode the complete legend or each item might have an background.

       The default setting is LegendBackground.

       Seealso:setBackgroundMode(), setBackgroundBrush(), drawBackground()EnumeratorLegendBackground
              The legend has a background.

       ItemBackground
              Each item has a background.

Qt::AlignmentQwtPlotLegendItem::alignment()constReturns:
           Alignment flags

       Seealso:setAlignment()QBrushQwtPlotLegendItem::backgroundBrush()constReturns:
           Brush is used to fill the background

       Seealso:setBackgroundBrush(), backgroundMode(), drawBackground()QwtPlotLegendItem::BackgroundModeQwtPlotLegendItem::backgroundMode()constReturns:
           backgroundMode

       Seealso:setBackgroundMode(), backgroundBrush(), drawBackground()intQwtPlotLegendItem::borderDistance()constReturns:
           Margin between the legend and the canvas border

       Seealso:margin()QPenQwtPlotLegendItem::borderPen()constReturns:
           Pen for drawing the border

       Seealso:setBorderPen(), backgroundBrush()doubleQwtPlotLegendItem::borderRadius()constReturns:
           Radius of the border

       Seealso:setBorderRadius(), setBorderPen()voidQwtPlotLegendItem::draw(QPainter*painter,constQwtScaleMap&xMap,constQwtScaleMap&yMap,constQRectF&canvasRect)const[virtual]
       Draw the legend

       Parameters:painter Painter
           xMap x Scale Map
           yMap y Scale Map
           canvasRect Contents rectangle of the canvas in painter coordinates

       Implements QwtPlotItem.

   voidQwtPlotLegendItem::drawBackground(QPainter*painter,constQRectF&rect)const[protected],[virtual]
       Draw a rounded rect

       Parameters:painter Painter
           rect Bounding rectangle

       Seealso:setBorderRadius(), setBorderPen(), setBackgroundBrush(), setBackgroundMode()voidQwtPlotLegendItem::drawLegendData(QPainter*painter,constQwtPlotItem*plotItem,constQwtLegendData&data,constQRectF&rect)const[protected],[virtual]
       Draw an entry on the legend

       Parameters:painter Qt Painter
           plotItem Plot item, represented by the entry
           data Attributes of the legend entry
           rect Bounding rectangle for the entry

   QFontQwtPlotLegendItem::font()constReturns:
           Font used for drawing the text label

       Seealso:setFont()QRectQwtPlotLegendItem::geometry(constQRectF&canvasRect)const[virtual]
       Calculate the geometry of the legend on the canvas

       Parameters:canvasRect Geometry of the canvas

       Returns:
           Geometry of the legend

   intQwtPlotLegendItem::heightForWidth(constQwtLegendData&data,intwidth)const[virtual]Returns:
           The preferred height, for a width.

       Parameters:data Attributes of the legend entry
           width Width

   intQwtPlotLegendItem::itemMargin()constReturns:
           Margin around each item

       Seealso:setItemMargin(), itemSpacing(), margin(), spacing()intQwtPlotLegendItem::itemSpacing()constReturns:
           Spacing inside of each item

       Seealso:setItemSpacing(), itemMargin(), margin(), spacing()QList<QRect>QwtPlotLegendItem::legendGeometries(constQwtPlotItem*plotItem)constReturns:
           Geometries of the items of a plot item

       Note:
           Usually a plot item has only one entry on the legend

   intQwtPlotLegendItem::margin()constReturns:
           Margin around the legend items

       Seealso:setMargin(), spacing(), itemMargin(), itemSpacing()uintQwtPlotLegendItem::maxColumns()constReturns:
           Maximum number of columns

       Seealso:maxColumns(), QwtDynGridLayout::maxColumns()QSizeQwtPlotLegendItem::minimumSize(constQwtLegendData&data)const[virtual]
       Minimum size hint needed to display an entry

       Parameters:data Attributes of the legend entry

       Returns:
           Minimum size

   QList<constQwtPlotItem*>QwtPlotLegendItem::plotItems()constReturns:
           All plot items with an entry on the legend

       Note:
           A plot item might have more than one entry on the legend

   intQwtPlotLegendItem::rtti()const[virtual]Returns:QwtPlotItem::Rtti_PlotLegend

       Reimplemented from QwtPlotItem.

   voidQwtPlotLegendItem::setAlignment(Qt::Alignmentalignment)
       Set  the  alignmnet.  Alignment  means  the  position  of the legend relative to the geometry of the plot
       canvas.

       Parameters:alignment Alignment flags

       Seealso:alignment(), setMaxColumns()Note:
           To align a legend with many items horizontally the number of columns need to be limited

   voidQwtPlotLegendItem::setBackgroundBrush(constQBrush&brush)
       Set the background brush. The brush is used to fill the background

       Parameters:brush Brush

       Seealso:backgroundBrush(), setBackgroundMode(), drawBackground()voidQwtPlotLegendItem::setBackgroundMode(BackgroundModemode)
       Set the background mode. Depending on the mode the complete legend or each item might have an background.

       The default setting is LegendBackground.

       Seealso:backgroundMode(), setBackgroundBrush(), drawBackground()voidQwtPlotLegendItem::setBorderDistance(intdistance)
       Set the margin between the legend and the canvas border. The default setting for the margin is 10 pixels.

       Parameters:distance Margin in pixels

       Seealso:setMargin()voidQwtPlotLegendItem::setBorderPen(constQPen&pen)
       Set the pen for drawing the border

       Parameters:pen Border pen

       Seealso:borderPen(), setBackgroundBrush()voidQwtPlotLegendItem::setBorderRadius(doubleradius)
       Set the radius for the border

       Parameters:radius A value <= 0 defines a rectangular border

       Seealso:borderRadius(), setBorderPen()voidQwtPlotLegendItem::setFont(constQFont&font)
       Change the font used for drawing the text label

       Parameters:font Legend font

       Seealso:font()voidQwtPlotLegendItem::setItemMargin(intmargin)
       Set the margin around each item

       Parameters:margin Margin

       Seealso:itemMargin(), setItemSpacing(), setMargin(), setSpacing()voidQwtPlotLegendItem::setItemSpacing(intspacing)
       Set the spacing inside of each item

       Parameters:spacing Spacing

       Seealso:itemSpacing(), setItemMargin(), setMargin(), setSpacing()voidQwtPlotLegendItem::setMargin(intmargin)
       Set the margin around legend items. The default setting for the margin is 0.

       Parameters:margin Margin in pixels

       Seealso:margin(), setSpacing(), setItemMargin(), setItemSpacingvoidQwtPlotLegendItem::setMaxColumns(uintmaxColumns)
       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.

       Parameters:maxColumns Maximum number of columns. 0 means unlimited.

       Seealso:maxColumns(), QwtDynGridLayout::setMaxColumns()voidQwtPlotLegendItem::setSpacing(intspacing)
       Set the spacing between the legend items.

       Parameters:spacing Spacing in pixels

       Seealso:spacing(), setMargin()voidQwtPlotLegendItem::setTextPen(constQPen&pen)
       Set the pen for drawing text labels.

       Parameters:pen Text pen

       Seealso:textPen(), setFont()intQwtPlotLegendItem::spacing()constReturns:
           Spacing between the legend items

       Seealso:setSpacing(), margin(), itemSpacing(), itemMargin()QPenQwtPlotLegendItem::textPen()constReturns:
           Pen for drawing text labels

       Seealso:setTextPen(), font()voidQwtPlotLegendItem::updateLegend(constQwtPlotItem*plotItem,constQList<QwtLegendData>&data)[virtual]
       Update the legend items according to modifications of a plot item

       Parameters:plotItem Plot item
           data Attributes of the legend entries

       Reimplemented from QwtPlotItem.

       QwtPlotLegendItem - A class which draws a legend inside the plot canvas.

       #include <qwt_plot_legenditem.h>

       Inherits QwtPlotItem.

   PublicTypes
       enum BackgroundMode { LegendBackground, ItemBackground }
           Background mode.

   PublicMemberFunctionsQwtPlotLegendItem ()
           Constructor.
       virtual ~QwtPlotLegendItem ()
           Destructor.
       virtual int rtti () const
       void setAlignment (Qt::Alignment)
           Set the alignmnet.
       Qt::Alignment alignment () const
       void setMaxColumns (uint)
           Limit the number of columns.
       uint maxColumns () const
       void setMargin (int)
           Set the margin around legend items.
       int margin () const
       void setSpacing (int)
           Set the spacing between the legend items.
       int spacing () const
       void setItemMargin (int)
       int itemMargin () const
       void setItemSpacing (int)
       int itemSpacing () const
       void setFont (const QFont &)
       QFont font () const
       void setBorderDistance (int)
           Set the margin between the legend and the canvas border.
       int borderDistance () const
       void setBorderRadius (double)
       double borderRadius () const
       void setBorderPen (const QPen &)
       QPen borderPen () const
       void setBackgroundBrush (const QBrush &)
           Set the background brush.
       QBrush backgroundBrush () const
       void setBackgroundMode (BackgroundMode)
           Set the background mode.
       BackgroundModebackgroundMode () const
       void setTextPen (const QPen &)
           Set the pen for drawing text labels.
       QPen textPen () const
       virtual void draw (QPainter *, const QwtScaleMap &xMap, const QwtScaleMap &yMap, const QRectF
           &canvasRect) const
       void clearLegend ()
           Remove all items from the legend.
       virtual void updateLegend (const QwtPlotItem *, const QList< QwtLegendData > &)
       virtual QRect geometry (const QRectF &canvasRect) const
       virtual QSize minimumSize (const QwtLegendData &) const
       virtual int heightForWidth (const QwtLegendData &, int width) const
       QList< const QwtPlotItem *> plotItems () const
       QList< QRect > legendGeometries (const QwtPlotItem *) const

   ProtectedMemberFunctions
       virtual void drawLegendData (QPainter *painter, const QwtPlotItem *, const QwtLegendData &, const QRectF
           &) const
       virtual void drawBackground (QPainter *, const QRectF &rect) const