These functions are minor modifications of those in the ggrepel package. geom_dag_text_repel adds text directly to the plot. geom_dag_label_repel draws a rectangle underneath the text, making it easier to read. The text labels repel away from each other and away from the data points.

geom_dag_text_repel(
mapping = NULL,
data = NULL,
parse = FALSE,
...,
segment.color = "#666666",
fontface = "bold",
segment.size = 0.5,
arrow = NULL,
force = 1,
max.iter = 2000,
nudge_x = 0,
nudge_y = 0,
na.rm = FALSE,
show.legend = NA,
inherit.aes = TRUE
)

geom_dag_label_repel(
mapping = NULL,
data = NULL,
parse = FALSE,
...,
label.r = grid::unit(0.15, "lines"),
label.size = 0.25,
segment.color = "grey50",
segment.size = 0.5,
arrow = NULL,
force = 1,
max.iter = 2000,
nudge_x = 0,
nudge_y = 0,
na.rm = FALSE,
show.legend = NA,
inherit.aes = TRUE
)

## Arguments

mapping Set of aesthetic mappings created by aes or aes_. If specified and inherit.aes = TRUE (the default), is combined with the default mapping at the top level of the plot. You only need to supply mapping if there isn't a mapping defined for the plot. A data frame. If specified, overrides the default data frame defined at the top level of the plot. If TRUE, the labels will be parsed into expressions and displayed as described in ?plotmath other arguments passed on to layer. There are three types of arguments you can use here: Aesthetics: to set an aesthetic to a fixed value, like colour = "red" or size = 3. Other arguments to the layer, for example you override the default stat associated with the layer. Other arguments passed on to the stat. Amount of padding around bounding box, as unit or number. Defaults to 0.25. (Default unit is lines, but other units can be specified by passing unit(x, "units")). Amount of padding around labeled point, as unit or number. Defaults to 0. (Default unit is lines, but other units can be specified by passing unit(x, "units")). See ggrepel::geom_text_repel() A character vector. Default is "bold" specification for arrow heads, as created by arrow Force of repulsion between overlapping text labels. Defaults to 1. Maximum number of iterations to try to resolve overlaps. Defaults to 10000. Horizontal and vertical adjustments to nudge the starting position of each text label. Horizontal and vertical adjustments to nudge the starting position of each text label. If FALSE (the default), removes missing values with a warning. If TRUE silently removes missing values. logical. Should this layer be included in the legends? NA, the default, includes if any aesthetics are mapped. FALSE never includes, and TRUE always includes. If FALSE, overrides the default aesthetics, rather than combining with them. This is most useful for helper functions that define both data and aesthetics and shouldn't inherit behaviour from the default plot specification, e.g. borders. Amount of padding around label, as unit or number. Defaults to 0.25. (Default unit is lines, but other units can be specified by passing unit(x, "units")). Radius of rounded corners, as unit or number. Defaults to 0.15. (Default unit is lines, but other units can be specified by passing unit(x, "units")). Size of label border, in mm.

## Examples

g <- dagify(m ~ x + y,
y ~ x,
exposure = "x",
outcome = "y",
latent = "m",
labels = c("x" = "Exposure", "y" = "Outcome", "m" = "Collider"))

g %>% tidy_dagitty() %>%
ggplot(aes(x = x, y = y, xend = xend, yend = yend)) +
geom_dag_edges() +
geom_dag_point() +
geom_dag_text_repel(aes(label = name), show.legend = FALSE) +
theme_dag()
g %>% tidy_dagitty() %>%
dag_label(labels = c("x" = "This is the exposure",
"y" = "Here's the outcome",
"m" = "Here is where they collide")) %>%
ggplot(aes(x = x, y = y, xend = xend, yend = yend)) +
geom_dag_edges() +
geom_dag_point() +
geom_dag_text() +
geom_dag_label_repel(aes(label = label, fill = label),
col = "white", show.legend = FALSE) +
theme_dag()