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glify-polygons.R
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glify-polygons.R
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#' add polygons/polygons to a leaflet map using Leaflet.glify
#'
#' @details
#' Multipolygons are currently not supported! Make sure you cast your data
#' to polygons first (e.g. using \code{sf::st_cast(data, "POLYGON")}.
#'
#' @examples
#' \dontrun{
#' library(mapview)
#' library(leaflet)
#' library(leafgl)
#' library(sf)
#' library(colourvalues)
#'
#' fran = st_cast(franconia, "POLYGON")
#'
#' cols = colour_values_rgb(fran$NUTS_ID, include_alpha = FALSE) / 255
#'
#' options(viewer = NULL)
#'
#' leaflet() %>%
#' addProviderTiles(provider = providers$CartoDB.DarkMatter) %>%
#' addGlPolygons(data = fran, color = cols) %>%
#' addMouseCoordinates() %>%
#' setView(lng = 10.5, lat = 49.5, zoom = 8)
#' }
#'
#' @describeIn addGlPoints add polygons to a leaflet map using Leaflet.glify
#' @aliases addGlPolygons
#' @export addGlPolygons
addGlPolygons = function(map,
data,
color = cbind(0, 0.2, 1),
opacity = 0.6,
group = "glpolygons",
popup = NULL,
...) {
if (is.null(group)) group = deparse(substitute(data))
if (inherits(data, "Spatial")) data <- sf::st_as_sf(data)
stopifnot(inherits(sf::st_geometry(data), c("sfc_POLYGON", "sfc_MULTIPOLYGON")))
if (inherits(sf::st_geometry(data), "sfc_MULTIPOLYGON"))
stop("Can only handle POLYGONs, please cast your MULTIPOLYGON to POLYGON using sf::st_cast")
# data
if (is.null(popup)) {
geom = sf::st_transform(sf::st_geometry(data), crs = 4326)
data = sf::st_sf(id = 1:length(geom), geometry = geom)
} else {
data = sf::st_transform(data[, popup], crs = 4326)
}
data = geojsonsf::sf_geojson(data, ...)
# color
if (ncol(color) != 3) stop("only 3 column color matrix supported so far")
color = as.data.frame(color, stringsAsFactors = FALSE)
colnames(color) = c("r", "g", "b")
# cols = jsonlite::toJSON(color)
cols = jsonify::to_json(color, digits = 3)
# dependencies
map$dependencies = c(
map$dependencies,
glifyDependencies()
)
leaflet::invokeMethod(map, leaflet::getMapData(map), 'addGlifyPolygons',
data, cols, popup, opacity, group)
}
### via src
addGlPolygonsSrc = function(map,
data,
color = cbind(0, 0.2, 1),
opacity = 0.6,
weight = 10,
group = "glpolygons",
popup = NULL,
...) {
if (is.null(group)) group = deparse(substitute(data))
if (inherits(data, "Spatial")) data <- sf::st_as_sf(data)
stopifnot(inherits(sf::st_geometry(data), c("sfc_POLYGON", "sfc_MULTIPOLYGON")))
if (inherits(sf::st_geometry(data), "sfc_MULTIPOLYGON"))
stop("Can only handle POLYGONs, please cast your MULTIPOLYGON to POLYGON using sf::st_cast")
# temp directories
dir_data = tempfile(pattern = "glify_polygons_dat")
dir.create(dir_data)
dir_color = tempfile(pattern = "glify_polygons_col")
dir.create(dir_color)
# dir_popup = tempfile(pattern = "glify_polygons_pop")
# dir.create(dir_popup)
# data
geom = sf::st_transform(sf::st_geometry(data), crs = 4326)
if (is.null(popup)) {
data = sf::st_sf(id = 1:length(geom),
geometry = geom)
} else {
data = sf::st_transform(data[, popup], crs = 4326)
}
# crds = sf::st_coordinates(data)[, c(2, 1)]
fl_data = paste0(dir_data, "/", group, "_data.json")
pre = paste0('var data = data || {}; data["', group, '"] = ')
writeLines(pre, fl_data)
cat('[', geojsonsf::sf_geojson(data, ...), '];',
file = fl_data, sep = "", append = TRUE)
# color
if (ncol(color) != 3) stop("only 3 column color matrix supported so far")
color = as.data.frame(color, stringsAsFactors = FALSE)
colnames(color) = c("r", "g", "b")
fl_color = paste0(dir_color, "/", group, "_color.json")
pre = paste0('var col = col || {}; col["', group, '"] = ')
writeLines(pre, fl_color)
cat('[', jsonlite::toJSON(color, digits = 3), '];',
file = fl_color, append = TRUE)
# popup
# if (!is.null(popup)) {
# pop = jsonlite::toJSON(data[[popup]])
# fl_popup = paste0(dir_popup, "/", group, "_popup.json")
# popup_var = paste0(group, "pop")
# cat(pop, file = fl_popup, append = FALSE)
# } else {
# popup_var = NULL
# }
# dependencies
map$dependencies = c(
map$dependencies,
glifyDependenciesSrc(),
glifyDataAttachmentSrc(fl_data, group),
glifyColorAttachmentSrc(fl_color, group)
)
# if (!is.null(popup)) {
# map$dependencies = c(
# map$dependencies,
# glifyPopupAttachment(fl_popup, group)
# )
# }
leaflet::invokeMethod(map, leaflet::getMapData(map), 'addGlifyPolygonsSrc',
group, popup, opacity)
}
### via attachments
addGlPolygonsFl = function(map,
data,
color = cbind(0, 0.2, 1),
opacity = 0.6,
weight = 10,
group = "glpolygons",
popup = NULL,
...) {
if (is.null(group)) group = deparse(substitute(data))
if (inherits(data, "Spatial")) data <- sf::st_as_sf(data)
stopifnot(inherits(sf::st_geometry(data), c("sfc_POLYGON", "sfc_MULTIPOLYGON")))
if (inherits(sf::st_geometry(data), "sfc_MULTIPOLYGON"))
stop("Can only handle POLYGONs, please cast your MULTIPOLYGON to POLYGON using sf::st_cast")
# temp directories
dir_data = tempfile(pattern = "glify_polygons_dt")
dir.create(dir_data)
dir_color = tempfile(pattern = "glify_polygons_cl")
dir.create(dir_color)
# dir_popup = tempfile(pattern = "glify_polygons_pop")
# dir.create(dir_popup)
# data
geom = sf::st_transform(sf::st_geometry(data), crs = 4326)
if (is.null(popup)) {
data = sf::st_sf(id = 1:length(geom),
geometry = geom)
} else {
data = sf::st_transform(data[, popup], crs = 4326)
}
# crds = sf::st_coordinates(data)[, c(2, 1)]
fl_data = paste0(dir_data, "/", group, "_data.json")
cat(geojsonsf::sf_geojson(data), file = fl_data, append = FALSE)
data_var = paste0(group, "dt")
# color
if (ncol(color) != 3) stop("only 3 column color matrix supported so far")
color = as.data.frame(color, stringsAsFactors = FALSE)
colnames(color) = c("r", "g", "b")
jsn = jsonlite::toJSON(color)
fl_color = paste0(dir_color, "/", group, "_color.json")
color_var = paste0(group, "cl")
cat(jsn, file = fl_color, append = FALSE)
# popup
# if (!is.null(popup)) {
# pop = jsonlite::toJSON(data[[popup]])
# fl_popup = paste0(dir_popup, "/", group, "_popup.json")
# popup_var = paste0(group, "pop")
# cat(pop, file = fl_popup, append = FALSE)
# } else {
# popup_var = NULL
# }
# dependencies
map$dependencies = c(
map$dependencies,
glifyDependencies(),
glifyDataAttachment(fl_data, group),
glifyColorAttachment(fl_color, group)
)
# if (!is.null(popup)) {
# map$dependencies = c(
# map$dependencies,
# glifyPopupAttachment(fl_popup, group)
# )
# }
leaflet::invokeMethod(map, leaflet::getMapData(map), 'addGlifyPolygonsFl',
data_var, color_var, popup, opacity)
}