prFpDrawLegend(lGrobs, col, colgap, pos, gp, r, padding, fn.legend, ...)prFpGetLegendGrobsgpar options for the
legend. If you want the background color to be light grey
then use gp = gpar(fill = "lightgrey"). If you
want a border then set the col argument: gp =
grid.roundrect. The r option should
be a unit object. This is by default
unit(0, "snpc")fn.legendvoid