You might try looking at the tkrplot package, it uses win.metafile and captures the graphics device into a variable (which is then put into a tk lable, but you could probably do something else with it).
-- Gregory (Greg) L. Snow Ph.D. Statistical Data Center Intermountain Healthcare [EMAIL PROTECTED] (801) 408-8111 > -----Original Message----- > From: [EMAIL PROTECTED] > [mailto:[EMAIL PROTECTED] On Behalf Of Josh Tolley > Sent: Thursday, November 15, 2007 2:08 PM > To: r-help@r-project.org > Subject: [R] Graphics device storable in a variable > > I'm using R embedded in PostgreSQL (via PL/R), and would like > to use it to create images. It works fine, except that I have > to create every image in a file (owned by and only readable > by the PostgreSQL server), and then use PostgreSQL to read > from that file and return it to the client. It would be much > nicer if I could plot images into an R variable (for > instance, a matrix), and return that variable through the > PostgreSQL client. Leaving aside the details of returning the > data to PostgreSQL (which I realize are beyond the scope of > this list), I envision R code along the lines of the following: > > # Create a png device, a handle to which is stored in myDevice > > myDevice <- png.variable(height = 1280, width = 1024, bg = "white") > # Plot some data into the current device > > plot(myX, myY, col="red") > # Finalize > > dev.off() > # Print out the contents of myDevice > > myDevice > > ...and the data would print out just like any other matrix or > class or whatever type myDevice actually is. > > So my question is does such a thing already exist? I know > about piximage, but apparently I have to load image data from > somewhere for it to work; I can't use plot(), etc. to create > the piximage data. GDD would be a nice way to do it, because > GD libraries are widely available for use with other > languages I might use with PostgreSQL and PL/R (for instance, > Perl would talk to PostgreSQL, call a PL/R function to use R > to return an image, which Perl would then process further), > but GDD requires temporary files as well, as far as I can > see. Thanks for any help anyone can offer. > > -Josh / eggyknap > > ______________________________________________ > R-help@r-project.org mailing list > https://stat.ethz.ch/mailman/listinfo/r-help > PLEASE do read the posting guide > http://www.R-project.org/posting-guide.html > and provide commented, minimal, self-contained, reproducible code. > ______________________________________________ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
