geom_point borders in ggplot2 2.0.0
In an email to the ggplot2 listserve, Hadley mentions "geom_point() now uses shape 19 instead of 16. This looks much better on the default Linux graphics device. (It’s very slightly smaller than the old point, but it shouldn’t affect any graphics significantly)."
library(ggplot2)ggplot(mtcars) + geom_point(aes(wt, qsec), size = 8, stroke = 0, shape=16, alpha = .3)