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#' Draw edges as LINESTRINGs in geographical space
#'
#' This geom is equivalent in functionality to [ggplot2::geom_sf()] for `LINESTRING`
#' geometries and allows for plotting of edges in their geographical space in
#' different colours, linetypes and widths.
#'
#' @section Aesthetics:
#' `geom_edge_sf` understand the following aesthetics.
#'
#' - alpha
#' - colour
#' - linetype
#' - filter
#'
#' @inheritParams ggplot2::geom_sf
#'
#' @param mapping Set of aesthetic mappings created by [ggplot2::aes()]
#' or [ggplot2::aes_()]. By default geometry is mapped to the geometry in
#' the edge data.
#'
#' @author Lorena Abad
#'
#' @family geom_edge_*
#'
#' @examples
#' if (require("sfnetworks", quietly = TRUE)) {
#' gr <- sfnetworks::as_sfnetwork(roxel)
#' ggraph(gr, 'sf') + geom_edge_sf()
#' }
#'
#' @export
#'
geom_edge_sf <- function(mapping = NULL, data = get_sf_edges(),
position = 'identity', show.legend = NA, ...) {
mapping <- complete_edge_aes(mapping)
mapping <- aes_intersect(mapping, aes(geometry = geometry))
c(
layer_sf(
geom = GeomEdgeSf, data = data, mapping = mapping, stat = StatFilterSf,
position = position, show.legend = show.legend, inherit.aes = FALSE,
params = expand_edge_aes(list2(na.rm = FALSE, ...))
),
coord_sf(default = TRUE)
)
}
#' @rdname get_edges
get_sf_edges <- function(){
function(layout) {
edges <- sf::st_as_sf(attr(layout, "graph"), "edges")
attr(edges, 'type_ggraph') <- 'edge_ggraph'
edges
}
}
#' @rdname ggraph-extensions
#' @format NULL
#' @usage NULL
#' @export
GeomEdgeSf = ggproto("GeomEdgeSf", GeomSf,
draw_panel = function(data, panel_params, coords) {
names(data) <- sub('edge_', '', names(data))
names(data)[names(data) == 'width'] <- 'linewidth'
GeomSf$draw_panel(data, panel_params, coords)
},
draw_key = GeomEdgePath$draw_key,
default_aes = aes(
edge_colour = 'black', edge_width = 0.5, edge_linetype = 1,
edge_alpha = NA
),
rename_size = FALSE
)
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