A custom legend key function that displays a collider pattern with two
nodes pointing to one central node. This is particularly useful for
visualizing collider relationships in DAGs.
Usage
draw_key_dag_collider(data, params, size)
Arguments
- data
A data frame containing aesthetic information for the legend key
- params
Additional parameters (not currently used)
- size
Legend key size (not currently used)
Value
A grob object for the legend key
