I am building a bar chart for which bars suffice as indications of horizontal (x) placement, so I'd like to avoid drawing the superfluous vertical gridlines.
I understand how to style the minor and major gridlines in opts(), but I can't for the life of me figure out how to suppress just the vertical gridlines.
data <- data.frame(x = 1:10, y = c(3,5,2,5,6,2,7,6,5,4))
ggplot(data, aes(x, y)) +
geom_bar(stat = 'identity') +
panel.grid.major = theme_line(size = 0.5, colour = '#1391FF'),
panel.grid.minor = theme_line(colour = NA),
panel.background = theme_rect(colour = NA),
axis.ticks = theme_segment(colour = NA)
At this point, it's looking like I'm going to have to suppress all of the gridlines and then draw them back in with geom_hline(), which seems like kind of a pain (also, it's not entirely clear how I can find the tick/major gridline positions to feed to geom_hline().)
Any thoughts would be appreciated!