[R] Query for semi-transparency support

[baptiste auguie]

Here's a warning, but it sounds like it's at a deep (C, presumably) level,

xfig()
grid::grid.rect(gp=gpar(fill="red", alpha=0.5))
Warning message:
In grid.Call.graphics("L_rect", x$x, x$y, x$width, x$height,
resolveHJust(x$just,  :
  semi-transparency is not supported on this device: reported only once per page

HTH,

baptiste

On 16 August 2011 15:25, Jesse Brown <jesse.r.brown at gmail.com> wrote:
> In ?par there is the following line:
>
>  "Semi-transparent colors are available for use on devices that support them."
>
> I'm looking for a way to query for that support on the current device.
> I'm pretty sure that this functionality exists at some level as I
> remember seeing warnings to this effect but my searches have come up
> empty. Is anyone familiar with a direct path to this information?
>
> Thank you,
>
> Jesse
>
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