Thanks for the help on the translucent dots. What would be the best method for creating a map of the facility? I looked into map* in the libraries and didn't find anything on creating the maps, just using them.
Thanks again... Shawn Way, PE Engineering Manager [EMAIL PROTECTED] -----Original Message----- From: Prof Brian Ripley [mailto:[EMAIL PROTECTED] Sent: Thursday, October 14, 2004 6:05 AM To: Barry Rowlingson Cc: Shawn Way; [EMAIL PROTECTED] Subject: Re: [R] Maps and plotting On Thu, 14 Oct 2004, Barry Rowlingson wrote: > Shawn Way wrote: > > 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. I think this may mean *translucent* dots. R has been able to do transparent dots for a very long time, but PNG cannot handle translucency. On devices (e.g. pdf) which can, you can do this as of R 2.0.0. -- Brian D. Ripley, [EMAIL PROTECTED] Professor of Applied Statistics, http://www.stats.ox.ac.uk/~ripley/ University of Oxford, Tel: +44 1865 272861 (self) 1 South Parks Road, +44 1865 272866 (PA) Oxford OX1 3TG, UK Fax: +44 1865 272595 ______________________________________________ [EMAIL PROTECTED] mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html
