Maybe it is a silly question, but I couldn't find the answer in the handbook of ggplot2 nor with "aunt" google...
How do I plot a circle with ggplot2 as an additional layer if I have a middle point and a diameter? Thanks for your help.
6 Answers
with ggplot2 >= 0.9 you can also do
library(grid)
qplot(1:10, 1:10, geom="blank") +
annotation_custom(grob=circleGrob(r=unit(1,"npc")), xmin=2, xmax=4, ymin=4, ymax=6)
Related