hadley/ggplot2 — comment on commit d8257b1cfc88ff989d45587f11092cd726a43c67
File: R/grob-dotstack.r line 43
By baptiste:

is there a particular reason to limit this grob to circles? I imagine it would be possible to also map different shapes, colour, alpha and fill in general. The tricky part would be to register the particular size of each pch=1:23, they differ slightly in their bounding box (see http://tolstoy.newcastle.edu.au/R/e6/devel/09/05/1840.html)