Is it possible to control the legend key size when using ggdag?-CodePudding

I am drawing DAGs in R using ggdag and I would like to change the size of the legend key without changing the size of the DAG nodes.

The theme() argument legend.key.size appears to control the size of an invisible box around the legend key, but doesn't affect the actual key size, as illustrated by the code below.


ggdag::confounder_triangle() %>% 
  ggdag::node_status() %>%
  ggplot(aes(x=x,y=y, color = status))   
  geom_dag_point()  
  theme(legend.key.size = grid::unit(3, 'cm'))

The key size appears to respond to the size argument in geom_dag_point(), as illustrated with this code:

ggdag::confounder_triangle() %>% 
  ggdag::node_status() %>%
  ggplot(aes(x=x,y=y, color = status))   
  geom_dag_point(size = 4)

Is it possible to change the key size without changing the node size?

CodePudding user response：

You can change the size of the color with the guide_legend by the same override.aes argument in your guides. You can use the following code:

library(ggdag)
library(ggplot2)
ggdag::confounder_triangle() %>% 
  ggdag::node_status() %>%
  ggplot(aes(x=x,y=y, color = status))   
  ggdag::geom_dag_point()  
  guides(color = guide_legend(override.aes = list(size = 2)))

^{Created on 2022-07-14 by the reprex package (v2.0.1)}