Add RIVM-style tick marks between bar/column groups

Replaces the default per-category axis ticks of a bar/column chart with tick marks placed between each group of bars, following RIVM design guidelines. ggplot2 centers axis ticks under/next to each category by default; ro_gg_group_ticks() hides those and draws short line segments at the boundary between every pair of adjacent categories instead, plus the two outer edges.

Since the tick marks are drawn just outside the panel area, always use this function in combination with coord_cartesian(clip = "off").

Usage

ro_gg_group_ticks(plot, flip = FALSE)

Arguments

plot

A ggplot object with a discrete category axis (e.g. from geom_col()/geom_bar()).

flip

Logical. Set to TRUE if the category axis is y rather than x (the same orientation you'd pass to theme_ggrivm(flip = TRUE)). Default = FALSE.

Value

A ggplot object

See also

Other ggplot2: ro_gg_axis(), ro_gg_plot(), ro_gg_remove_axis_gap(), ro_gg_save(), ro_gg_theme(), ro_gg_y_title()

Examples

if (FALSE) { # \dontrun{
library(ggplot2)

dat <- data.frame(agegroup = c("0-19", "20-39", "40-59"), n = c(1200, 4800, 6100))
p <- ggplot(dat, aes(agegroup, n)) +
  geom_col() +
  theme_ggrivm()

ro_gg_group_ticks(p) +
  coord_cartesian(clip = "off")
} # }