[R] dynamically add items to key of lattice xyplot

[Deepayan Sarkar]

On 2/5/08, Bram Kuijper <a.l.w.kuijper at rug.nl> wrote:
> Hi all,
>
> is it possible to dynamically add key items to an already existing key,
> belonging to a lattice xyplot?

No.

-Deepayan

> This is what I do: I make an xyplot with an initial key. Later on, I
> want to extend this key with more items, as more lines are added to the
> plot (lines are added using trellis.focus("panel")).
>
> I guess I need some function to access the key panel in order to extend
> it, i.e., by using something like trellis.focus("legend"), but this only
> yields errors.
>
> Also, in the lattice documentation, the only separate key function I
> could find is draw.key(), no functions to add individual key items.
>
> anyone has more info on dynamically adding items to keys in xyplots?
>
> thanks,
> Bram Kuijper
>
> this is the code for my lattice xyplot plot:
>
> print(xyplot(current_data$FemDiploidUninf ~ current_data$generation,
> ylim=c(0,2000),
> scales=list(x=list(tick.number=4)),
> par.settings=list(plot.line=list(col='red')),
> type="l",
> key=list(text=list(c("blah","blah2")),x=0.5,y=0.5,lines=list(type="l",col="red")),
> ),newpage=FALSE)
>
> # add another line to plot
> trellis.focus("panel")
> ...
> trellis.unfocus()
>
> # focus on the existing key
> trellis.focus("legend",1,1,highlight=FALSE)
>
> ??
>
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