[Rd] text(1:10, col=NA) is not transparent

[Kasper Daniel Hansen]

Peter,

not all devices support transparency.  My guess is that you are
plotting to a device which does not, but it is hard to know from your
email.

Kasper



On Mon, Feb 20, 2012 at 6:09 AM, Peter Ruckdeschel
<peter.ruckdeschel at itwm.fraunhofer.de> wrote:
> Maybe I am missing something, but according to the help page
> to par (section "Color Specification"), which is referred to in the
> help to text argument col:
>
> ‘"transparent"’ or (integer) ‘NA’ is _transparent_,
> useful for filled areas (such as the background!), and just
> invisible for things like lines or text.
>
> but:
>
> col0 <- as.integer(NA)
> is.integer(col0)
> ### is this coercing to "integer" necessary?
> plot(1:10)
> text(1:10, col=col0)
> ### text is plotted
>
> ##whereas
> plot(1:10)
> text(1:10, col="transparent")
> ### text is not plotted
>
> # Of course, this is not terribly urgent, as a color value of 0 also
> plot(1:10)
> text(1:10, col=0)
> ### text is not plotted
>
> Best, Peter
>
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