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#' add polygons to a leaflet map using Leaflet.glify
#'
#' @details
#' MULTIPOLYGONs are currently not supported! Make sure you cast your data
#' to POLYGON first (e.g. using \code{sf::st_cast(data, "POLYGON")}.
#'
#' @examples
#' if (interactive()) {
#' library(leaflet)
#' library(leafgl)
#' library(sf)
#'
#' gadm = st_as_sf(gadmCHE)
#' gadm = st_cast(gadm, "POLYGON")
#' cols = grey.colors(nrow(gadm))
#'
#' leaflet() %>%
#' addProviderTiles(provider = providers$CartoDB.DarkMatter) %>%
#' addGlPolygons(data = gadm, color = cols, popup = TRUE)
#' }
#'
#' @describeIn addGlPoints add polygons to a leaflet map using Leaflet.glify
#' @aliases addGlPolygons
#' @export addGlPolygons
addGlPolygons = function(map,
data,
color = cbind(0, 0.2, 1),
fillColor = color,
fillOpacity = 0.8,
group = "glpolygons",
popup = NULL,
layerId = NULL,
src = FALSE,
...) {
if (isTRUE(src)) {
m = addGlPolygonsSrc(
map = map
, data = data
, color = color
, fillColor = fillColor
, fillOpacity = fillOpacity
, group = group
, popup = popup
, layerId = layerId
, ...
)
return(m)
}
## currently leaflet.glify only supports single (fill)opacity!
fillOpacity = fillOpacity[1]
if (is.null(group)) group = deparse(substitute(data))
if (inherits(data, "Spatial")) data <- sf::st_as_sf(data)
stopifnot(inherits(sf::st_geometry(data), c("sfc_POLYGON", "sfc_MULTIPOLYGON")))
if (inherits(sf::st_geometry(data), "sfc_MULTIPOLYGON"))
stop("Can only handle POLYGONs, please cast your MULTIPOLYGON to POLYGON using sf::st_cast",
call. = FALSE)
bounds = as.numeric(sf::st_bbox(data))
# fillColor
args <- list(...)
palette = "viridis"
if ("palette" %in% names(args)) {
palette <- args$palette
args$palette = NULL
}
fillColor <- makeColorMatrix(fillColor, data, palette = palette)
if (ncol(fillColor) != 3) stop("only 3 column fillColor matrix supported so far")
fillColor = as.data.frame(fillColor, stringsAsFactors = FALSE)
colnames(fillColor) = c("r", "g", "b")
cols = jsonify::to_json(fillColor, digits = 3)
# popup
if (is.null(popup)) {
# geom = sf::st_transform(sf::st_geometry(data), crs = 4326)
geom = sf::st_geometry(data)
data = sf::st_sf(id = 1:length(geom), geometry = geom)
} else if (isTRUE(popup)) {
data = data[, popup]
} else {
htmldeps <- htmltools::htmlDependencies(popup)
if (length(htmldeps) != 0) {
map$dependencies = c(
map$dependencies,
htmldeps
)
}
popup = makePopup(popup, data)
popup = jsonify::to_json(popup)
geom = sf::st_geometry(data)
data = sf::st_sf(id = 1:length(geom), geometry = geom)
}
# data
if (length(args) == 0) {
geojsonsf_args = NULL
} else {
geojsonsf_args = try(
match.arg(
names(args)
, names(as.list(args(geojsonsf::sf_geojson)))
, several.ok = TRUE
)
, silent = TRUE
)
if (inherits(geojsonsf_args, "try-error")) geojsonsf_args = NULL
if (identical(geojsonsf_args, "sf")) geojsonsf_args = NULL
}
data = do.call(geojsonsf::sf_geojson, c(list(data), args[geojsonsf_args]))
# data = geojsonsf::sf_geojson(data, ...)
# dependencies
map$dependencies = c(
glifyDependencies()
, map$dependencies
)
map = leaflet::invokeMethod(
map
, leaflet::getMapData(map)
, 'addGlifyPolygons'
, data
, cols
, popup
, fillOpacity
, group
, layerId
)
leaflet::expandLimits(
map,
c(bounds[2], bounds[4]),
c(bounds[1], bounds[3])
)
}
### via src
addGlPolygonsSrc = function(map,
data,
color = cbind(0, 0.2, 1),
fillColor = color,
fillOpacity = 0.6,
group = "glpolygons",
popup = NULL,
layerId = NULL,
...) {
if (is.null(group)) group = deparse(substitute(data))
if (is.null(layerId)) layerId = paste0(group, "-pls")
if (inherits(data, "Spatial")) data <- sf::st_as_sf(data)
stopifnot(inherits(sf::st_geometry(data), c("sfc_POLYGON", "sfc_MULTIPOLYGON")))
if (inherits(sf::st_geometry(data), "sfc_MULTIPOLYGON"))
stop("Can only handle POLYGONs, please cast your MULTIPOLYGON ",
"to POLYGON using e.g. sf::st_cast")
bounds = as.numeric(sf::st_bbox(data))
# temp directories
dir_data = tempfile(pattern = "glify_polygons_dat")
dir.create(dir_data)
dir_color = tempfile(pattern = "glify_polygons_col")
dir.create(dir_color)
dir_popup = tempfile(pattern = "glify_polygons_pop")
dir.create(dir_popup)
# data
data_orig <- data
geom = sf::st_geometry(data)
data = sf::st_sf(id = 1:length(geom), geometry = geom)
ell_args <- list(...)
fl_data = paste0(dir_data, "/", layerId, "_data.js")
pre = paste0('var data = data || {}; data["', layerId, '"] = ')
writeLines(pre, fl_data)
jsonify_args = try(
match.arg(
names(ell_args)
, names(as.list(args(geojsonsf::sf_geojson)))
, several.ok = TRUE
)
, silent = TRUE
)
if (inherits(jsonify_args, "try-error")) jsonify_args = NULL
if (identical(jsonify_args, "sf")) jsonify_args = NULL
cat('[', do.call(geojsonsf::sf_geojson, c(list(data), ell_args[jsonify_args])), '];',
file = fl_data, sep = "", append = TRUE)
map$dependencies = c(
map$dependencies,
glifyDependenciesSrc(),
glifyDataAttachmentSrc(fl_data, layerId)
)
# color
palette = "viridis"
if ("palette" %in% names(ell_args)) {
palette <- ell_args$palette
}
fillColor <- makeColorMatrix(fillColor, data_orig, palette = palette)
if (ncol(fillColor) != 3) stop("only 3 column fillColor matrix supported so far")
fillColor = as.data.frame(fillColor, stringsAsFactors = FALSE)
colnames(fillColor) = c("r", "g", "b")
if (nrow(fillColor) > 1) {
fl_color = paste0(dir_color, "/", layerId, "_color.js")
pre = paste0('var col = col || {}; col["', layerId, '"] = ')
writeLines(pre, fl_color)
cat('[', jsonify::to_json(fillColor), '];',
file = fl_color, append = TRUE)
map$dependencies = c(
map$dependencies,
glifyColorAttachmentSrc(fl_color, layerId)
)
fillColor = NULL
}
# popup
if (!is.null(popup)) {
htmldeps <- htmltools::htmlDependencies(popup)
if (length(htmldeps) != 0) {
map$dependencies = c(
map$dependencies,
htmldeps
)
}
popup = makePopup(popup, data_orig)
fl_popup = paste0(dir_popup, "/", layerId, "_popup.js")
pre = paste0('var popup = popup || {}; popup["', layerId, '"] = ')
writeLines(pre, fl_popup)
cat('[', jsonify::to_json(popup), '];',
file = fl_popup, append = TRUE)
map$dependencies = c(
map$dependencies,
glifyPopupAttachmentSrc(fl_popup, layerId)
)
}
map = leaflet::invokeMethod(
map
, leaflet::getMapData(map)
, 'addGlifyPolygonsSrc'
, fillColor
, fillOpacity
, group
, layerId
)
leaflet::expandLimits(
map,
c(bounds[2], bounds[4]),
c(bounds[1], bounds[3])
)
}
# ### 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 = jsonify::to_json(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)
#
# }
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