On Wed, Feb 9, 2011 at 11:25 AM, Simon Urbanek <simon.urba...@r-project.org> wrote: > Ben, > > I have committed something analogous to R-devel (your rotation code was not > unlike mine, I replicated the color handling from R internals to be > consistent, I fixed the drawing limits and added a check for x/y > conformance). Note that useRaster can only be used when x, y form a regular > grid. Although I tried a lot of corner cases (requiring quite a few fixes), > I'm sure I did not test all of them, so volunteers please give it a go and > compare it with non-raster output. > > The only thing I'm not quite happy about is the argument name: useRaster. > Personally, I hate camel case in R (it has crept in more recently making it > horribly inconsistent) so please feel free to suggest a better name ;).
It.is.spelled.camelCase. What about style=c("image", "raster")? This allows for future extensions too. /H > > Thanks, > Simon > > > On Feb 9, 2011, at 10:06 AM, Ben Bolker wrote: > >> On 11-02-08 10:03 PM, Simon Urbanek wrote: >>> Ben, >>> >>> did you actually look at the result of your function with useRaster=TRUE ? >>> ;) [Hint: don't use an image that is symmetric] >>> >>> Apart from that nice bug there are more issues as well, try >>> image(matrix(1:4,2),col=1:3) >>> The underlying issue is that as.raster() is not quite what you would hope. >>> Unfortunately I'm not aware of an easy fix (that doesn't involve going >> back to RGB decomposition). >>> >>> In general, I think it's a nice option, but I don't think you'll get away >>> with only a few lines... >>> >>> Cheers, >>> Simon >>> >>> >>> >>> On Feb 8, 2011, at 8:49 PM, Ben Bolker wrote: >>> >>>> >>>> Has anyone yet tried incorporating rasterImage into the base image() >>>> function? It seems to make a *huge* difference, with >>>> a very small number of added/changed lines of code. (Of course I have >>>> barely tested it at all.) >>>> Is there any reason this *shouldn't* go into the next release? >>>> >>>>> source("image.R") >>>>> z <- matrix(runif(1e6),nrow=1000) >>>>> image(z) >>>>> image(z,useRaster=TRUE) >>>> >>>> (Patch against SVN 54284 attached; people can contact me if it doesn't >>>> go through and they want it.) >>>> >>>> Ben Bolker >>>> >>>> <image_diff.txt>______________________________________________ >>>> R-devel@r-project.org mailing list >>>> https://stat.ethz.ch/mailman/listinfo/r-devel >> >> Trying again. Rotated counterclockwise within R (although this *could* >> be coded in C if speed were important?) >> Some brute-force testing suggests it is *slightly* slower for small >> images (7 vs 8 seconds for 1000 reps) and still much faster (and >> produces much smaller images, which don't suffer from antialiasing junk >> in my PDF viewer) for large images. >> <image_diff.txt><imagetest.R><image.R> > > ______________________________________________ > R-devel@r-project.org mailing list > https://stat.ethz.ch/mailman/listinfo/r-devel > ______________________________________________ R-devel@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-devel