At our facility we have multiple sample points that are sampled on any given day. What I would like to do is create a map of the facility with the sample points (and point labels) and when we have out of specification results, place a transparent dot over the area on the map. As the number of OOS results builds up, I envision the dot getting darker.
Over what timescale? This sounds like it could be an interactive, real-time on-line monitoring thing. Is it?
In which case R's graphics devices might not be good enough, and you'd be better off using a TclTk graphics canvas.
library(tcltk) and read the docs!
Another idea, if all you are doing is updating a daily image, would be to use a language like Python, and the Python Imaging Library (PIL) to draw pretty graphs.
I've done something similar that produces daily maps of disease incidence, but I used different size and colour circles and not transparency, so I just used base R graphics and produced a PNG file. If I wanted transparency I'd probably use Python/PIL, which can handle alpha channels.
Baz
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