[R] ggplot2 - plot with only legend?

[hadley wickham]

Hi Pedro,

There's no particularly easy way to do this.  However, you can create
the scales, train them manually, and then draw them in any way you
choose:

colour <- scale_colour_hue("My scale")
colour$train(factor(c("a","b")))
grid.newpage()
grid.draw(gglegend(colour$legend_desc(), list(colour="point")))

all though the details are now a little trick because of the new
legend collapsing code.

Hadley

On Sat, Apr 12, 2008 at 2:10 AM, Pedro de Barros <pbarros at ualg.pt> wrote:
> I just found out that this message got scrambled with other threads,
>  so I trying to re-send...
>
>  Dear R'ers,
>
>  I am trying to build a composite plot (with several plots in one
>  figure). I have tried, but I cannot use facetting, as I need to
>  customize each plot using grid.
>  Since all the plots are the same (with different data, but same
>  layout and categories), I would like to have only one legend, that I
>  would place in its own viewport, below all the other plots. My questions are
>
>  (a) is there is a way, in ggplot, to build a plot that is only the
>  legend (no data), where the legend occupies the whole viewport;
>
>  (b) How can I change the layout of the legend (e.g. have them written
>  side-by side, instead of over each other).
>
>  Thanks in advance,
>  Pedro
>
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