#' multipolygon class
#'
#' @export
#' @param x input
#' @examples
#' x <- '{ "type": "MultiPolygon",
#' "coordinates": [
#' [[[102.0, 2.0], [103.0, 2.0], [103.0, 3.0], [102.0, 3.0], [102.0, 2.0]]],
#' [[[100.0, 0.0], [101.0, 0.0], [101.0, 1.0], [100.0, 1.0], [100.0, 0.0]],
#' [[100.2, 0.2], [100.8, 0.2], [100.8, 0.8], [100.2, 0.8], [100.2, 0.2]]]
#' ]
#' }'
#' (y <- multipolygon(x))
#' geo_type(y)
#' geo_pretty(y)
#' geo_write(y, f <- tempfile(fileext = ".geojson"))
#' jsonlite::fromJSON(f, FALSE)
#' unlink(f)
#'
#' # add to a data.frame
#' library('tibble')
#' tibble(a = 1:5, b = list(y))
multipolygon <- function(x) {
UseMethod("multipolygon")
}
#' @export
multipolygon.default <- function(x) {
stop("no method for ", class(x)[1L], call. = FALSE)
}
#' @export
multipolygon.character <- function(x) {
json_val(x)
hint_geojson(x)
x <- as_x("MultiPolygon", x)
switch_verify_names(x)
verify_class(x, "MultiPolygon")
no_polygons <- length(asc(jqr::jq(x, ".coordinates[] | length ")))
coords <- get_coordinates(x)
structure(x, class = c("geomultipolygon", "geojson"),
no_polygons = no_polygons,
coords = coords)
}
#' @export
print.geomultipolygon <- function(x, ...) {
cat("<MultiPolygon>", "\n")
cat(" no. polygons: ", attr(x, "no_polygons"), "\n")
cat(" coordinates: ", attr(x, "coords"), "\n")
}
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