How do I control the font-family and size for text elements added to my boxplot:
Following the approach in this question, I have implemented the following code to show the number of observations:
library("ggplot2")
v_min <- -1
v_max <- 3.5
increm <- 0.5
y_limits <- c(v_min, v_max)
increms <- seq(v_min, v_max, increm)
counts <- function(x){
# you can experiment with 'adjust' and 'max-value' to find the perfect position
adjust <- 0.95
return(c(y = adjust * v_max, label = length(x)))
}
ggplot(d1, aes(x = ONRC_Hierarchy, y=lwpMeanRut_inc)) +
geom_boxplot(outlier.alpha = 0.2, outlier.size = 0.5) +
geom_hline(aes(yintercept=0), color="blue", linetype="dotted", size=1)+
stat_summary(fun.data = counts, geom = "text") +
scale_y_continuous(limits = y_limits, breaks = increms) +
xlab("") +
ylab("Rut Increment (mm/year)\n") +
theme_minimal() +
theme(
text = element_text(size = 10, family = "mono"),
axis.text.x=element_text(angle = -35, hjust = 0),
panel.grid.major.y = element_line(color = "lightgray",
size = 0.15,linetype = 2),
panel.grid.minor.y = element_blank(),
panel.grid.major.x = element_blank())
This solution works, as shown in the plot below, except that the font is different from the other graph elements. As you can see, I have tried to control this with the theme() statement, but it does not seem to work. Note, I deliberately used a small mono font to show the difference in the number of observations labels and the other graph elements.
>Solution :
Geom/stat fonts are set in the geom/stat layer, not in theme(). In this case, you can add family = "mono" as an argument to your stat_summary().
The size of fonts in geom_text/geom_label etc. is not on the same scale as element_text theme options, which are in points. You can read more about that here and here.