The RgoogleMaps package does something similar to this, you could look at the
code to see how those functions work and if they can be modified to work with
your graphic.
The general idea is to load the picture and plot it (the rimage package reads
and plots jpeg images, there are some other fun
Check out:
http://wiki.r-project.org/rwiki/doku.php?id=tips:graphics-misc:translucency
On Mon, Jun 1, 2009 at 6:17 PM, Søren Højsgaard
wrote:
> I want to create a plot of positions (x(t),y(t)) of animals in a barn for
> t=1,2,... (I have in mind creating many of these, saving them as png's and
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