#' Layouts

#' 

#' Layout your graph.

#' 

#' @inheritParams sg_nodes

#' @param nodes,edges Nodes and edges as prepared for sigmajs.

#' @param directed Whether or not to create a directed graph, passed to \code{\link[igraph]{graph_from_data_frame}}.

#' @param layout An \code{igraph} layout function.

#' @param save_igraph Whether to save the \code{igraph} object used internally.

#' @param ... Any other parameter to pass to \code{layout} function.

#' 

#' @details The package uses \code{igraph} internally for a lot of computations the \code{save_igraph} 

#' allows saving the object to speed up subsequent computations.

#' 

#' @section Functions:

#' \itemize{

#'   \item{\code{sg_layout} layout your graph.}

#'   \item{\code{sg_get_layout} helper to get graph's \code{x} and \code{y} positions.}

#' }

#' 

#' @examples 

#' nodes <- sg_make_nodes(250) # 250 nodes

#' edges <- sg_make_edges(nodes, n = 500)

#' 

#' sigmajs() %>% 

#'   sg_nodes(nodes, id, size, color) %>% 

#'   sg_edges(edges, id, source, target) %>% 

#'   sg_layout()

#' 

#' nodes_coords <- sg_get_layout(nodes, edges)

#' 

#' @return \code{sg_get_layout} returns nodes with \code{x} and \code{y} coordinates.

#' 

#' @rdname layout

#' @export

sg_layout <- function(sg, directed = TRUE, layout = igraph::layout_nicely, save_igraph = TRUE, ...){

  # clean

}

#' @rdname layout

#' @export

sg_get_layout <- function(nodes, edges, directed = TRUE, layout = igraph::layout_nicely, save_igraph = TRUE, ...){

  # clean

}