hi all - i'm having some difficulty figuring out how to convert between "user units" (which i can't find a definition for in the plotrix package) and either (a) device units (e.g. inches with PDFs) or (b) user coordinates along any particular axis.
as an example, suppose i set up a PDF device with inches, the device has both outer and inner magins, and the plot region has drastically different x and y coordinate ranges (e.g. xlim = c(0, 1), ylim = c(0, SOME_VERY_LARGE_NUMBER)). now i'd like to draw.circle(...) but i can't figure out what units the radius argument takes. "user units" doesn't appear to be inches in this case, and it it corresponds to user coordinates, i don't know which axis' scaling is to be used as the reference. ideally, one would be able to specify the radius in user coordinates while specifying _which_ axis to use as the standard (e.g. an axis = "y" or axis = "x" argument). getFigCtr(...) can help in figuring this out, but its argument takes the relative position of the "figure" region, rather than the "plot" region, which is more apt for properly placing shapes. i know the grid package has extensive unit conversion code, but i'm trying to update a series of figures using only base graphics... i can't seem to find a rigorous definition of "user units" anywhere in the plotrix package. anyone know of where i can find this info? cheers, -m ______________________________________________ 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.
