On Jan 10, 2008 6:16 PM, jiho <[EMAIL PROTECTED]> wrote: > Hi everyone, Hi Hadley, > > I am a heavy user of coord_equal() in ggplot2 since most of my data is > spatial, on x,y coordinates. Everything works. However by enforcing an > aspect ratio of 1 for the plotting region, coord_equal() usually > wastes a lot of space if the region of interest is not a perfect square. > > For example: > x=runif(10) > a=data.frame(x=x*3,y=x) > ggplot(data=a, aes(x=x,y=y)) + geom_point() + coord_equal() > produces a square plotting region while all the data is constrained in > an horizontally extended rectangle. I would expect the coordinates to > stay equal but the plot to be extended so that it fills as much as the > plotting region as possible. It does not appear to be currently > doable. Is it a limitation of ggplot? of the underlying grids > graphics? Is there a workaround this?
That's not currently possible unfortunately because coord_equal has no information about the size of the plotting device. Of course, if there is specific a non-square aspect ratio that you want, you can use e.g. qplot(x, y, data=a) + coord_equal(ratio = 2) + opts(aspect.ratio = 2) (or in the next version of ggplot qplot(x, y, data=a) + coord_equal(ratio = 2) where the aspect ratio is automatically set) > x=runif(10) > qplot(x*3, x) + coord_equal() > produces some very strange scales. this looks like a bug to me. > especially since: > foo=x > qplot(foo*3, foo) + coord_equal() > works as expected Yes, that's a bug that's fixed in the next version (which should be available on cran soon) > PPS: I tried > ggplot(data=a, aes(x=x,y=y)) + geom_point() + coord_equal() + > scale_y_continuous(limits=c(0,1)) > which has no effect. but the side effect of enforcing the square > domain is that: > ggplot(data=a, aes(x=x,y=y)) + geom_point() + coord_equal() + > scale_y_continuous(limits=c(0,0.3)) > has no effect either (i would expect to see only the points <0.3) That seems to have been fixed in the next version too. Hadley -- http://had.co.nz/ ______________________________________________ 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.
