interaction.plot() legend too narrow when mfcol > 2 (PR#1899)

[ligges@statistik.uni-dortmund.de]

maechler@stat.math.ethz.ch wrote:
> 
> Here is an example:
> 
>  The legends (mainly the factor level names) are cut off on the
>  right.  Somehow the internal calculation which computes
>  horizontal space for the legend is not flexible enough.
> 
> ## Call a new graphics window {with default par()s !}:
> get(getOption("device"))()
> par(mfrow = c(2,2))
> 
> ## part of  example(interaction.plot)  _improved_ using with() :
> data(OrchardSprays)
> with(OrchardSprays, {
>     interaction.plot(treatment, rowpos, decrease)
>     interaction.plot(rowpos, treatment, decrease)
> })
> 
> data(esoph)
> with(esoph, {
>     interaction.plot(agegp, alcgp, ncases/ncontrols)
>     interaction.plot(agegp, tobgp, ncases/ncontrols, trace.label="tobacco",
>                      fixed=TRUE)
> })
> 
> -------------------------------
> 
> Something that should be easy to fix, but needs some care (and
> time).
> Volunteers?

Martin, 

not right now (may be easy, but obviously not very easy ;-)). 
I'd like to comment that I filed this already as bug report #1305,
including a suggestion for a fix for a second bug related to axis
annotation.

Best,
Uwe

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