#' Canonicalize a DAG
#'
#' Takes an input graph with bidirected edges and replaces every bidirected edge
#' x <-> y with a substructure x <- L -> y, where L is a latent variable. See
#' [dagitty::canonicalize()] for details. Undirected edges
#' are not currently supported in `ggdag`.
#'
#' @param .dag,.tdy_dag input graph, an object of class `tidy_dagitty` or
#' `dagitty`
#' @param ... additional arguments passed to `tidy_dagitty()`
#' @inheritParams geom_dag
#'
#' @return a `tidy_dagitty` that includes L or a `ggplot`
#' @export
#'
#' @examples
#' dag <- dagify(y ~ x + z, x ~ ~z)
#'
#' ggdag(dag)
#'
#' node_canonical(dag)
#' ggdag_canonical(dag)
#'
#' @rdname canonicalize
#' @name Canonicalize DAGs
node_canonical <- function(.dag, ...) {
.dag <- if_not_tidy_daggity(.dag)
dagitty::canonicalize(pull_dag(.dag))$g %>%
tidy_dagitty(..., use_existing_coords = FALSE)
}
#' @rdname canonicalize
#' @export
ggdag_canonical <- function(
.tdy_dag,
...,
edge_type = "link_arc",
node_size = 16,
text_size = 3.88,
label_size = text_size,
text_col = "white",
label_col = text_col,
use_edges = TRUE,
use_nodes = TRUE,
use_stylized = FALSE,
use_text = TRUE,
use_labels = NULL,
label = NULL,
text = NULL,
node = deprecated(),
stylized = deprecated()) {
if_not_tidy_daggity(.tdy_dag, ...) %>%
node_canonical() %>%
ggdag(
node_size = node_size,
text_size = text_size,
label_size,
edge_type = edge_type,
text_col = text_col,
label_col = label_col,
use_edges = use_edges,
use_nodes = use_nodes,
use_stylized = use_stylized,
use_text = use_text,
use_labels = use_labels
)
}
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