#' mapshot pdf
#'
#' This is a \code{mapshot} adjustment that saves maps as pdf and
#' warns users if they choose png
#'
#' @inheritParams mapview::mapshot
#'
#' @export
#'
#' @examples
#' \dontrun{
#' library(leaflet)
#' library(councildown)
#' m <- leaflet() %>%
#' addTiles() %>%
#' addCouncilStyle(add_dists = TRUE)
#' mapshot(m, file = "test.png")
#' file.remove("test.png")
#' }
#'
#' @importFrom mapview mapshot
#' @importFrom tools file_path_sans_ext
#' @importFrom tools file_ext
#'
# copied from original mapshot code
mapshot <- function (x, url = NULL, file = NULL, zoom = 2, vwidth = 1000, vheight = 850,
remove_controls = c("zoomControl",
"layersControl", "homeButton", "scaleBar", "drawToolbar",
"easyButton"), ...)
{
avl_url = !is.null(url)
avl_file = !is.null(file)
if (!avl_url & !avl_file)
stop("Please provide a valid 'url' or 'file' argument (or both).")
if (avl_url)
url = normalizePath(url, mustWork = FALSE)
if (avl_file)
file = normalizePath(file, mustWork = FALSE)
if (inherits(x, "mapview")) {
x = mapview2leaflet(x)
}
if (!inherits(x, "leaflet") | mapview:::is_literally_false(remove_controls)) {
remove_controls = NULL
}
if (!avl_url) {
url = tempfile(fileext = ".html")
x = mapview:::removeMapJunk(x, remove_controls)
}
args = list(url = url, file = file, vwidth = vwidth, vheight = vheight, zoom = zoom, ...)
sw_ls = args
sw_ls[names(sw_ls) == "file"] = NULL
names(sw_ls)[which(names(sw_ls) == "url")] = "file"
sw_args = match.arg(names(sw_ls), names(as.list(args(htmlwidgets::saveWidget))),
several.ok = TRUE)
ws_args = match.arg(names(args), names(as.list(args(webshot::webshot))),
several.ok = TRUE)
do.call(htmlwidgets::saveWidget, append(list(x), sw_ls[sw_args]))
if (avl_file) {
if (is.null(remove_controls)) {
do.call(webshot::webshot, args)
return(invisible())
}
tmp_url = tempfile(fileext = ".html")
tmp_fls = paste0(tools::file_path_sans_ext(tmp_url),
"_files")
sw_ls = utils::modifyList(sw_ls, list(file = tmp_url))
args$url = tmp_url
x = mapview:::removeMapJunk(x, remove_controls)
do.call(htmlwidgets::saveWidget, append(list(x), sw_ls[sw_args]))
do.call(webshot::webshot, args[ws_args])
return(invisible())
}
}
#' addLegend - but with the option for the highest number to be at the top of the legend
#'
#' solution from mpriem89 (https://github.com/rstudio/leaflet/issues/256#issuecomment-440290201)
#'
#' @export
#'
#' @import leaflet
#'
addLegend_decreasing <- function (map, position = c("topright", "bottomright", "bottomleft","topleft"),
pal, values, na.label = "NA", bins = 7, colors,
opacity = 0.5, labels = NULL, labFormat = labelFormat(),
title = NULL, className = "info legend", layerId = NULL,
group = NULL, data = getMapData(map), decreasing = FALSE) {
position <- match.arg(position)
type <- "unknown"
na.color <- NULL
extra <- NULL
if (!missing(pal)) {
if (!missing(colors))
stop("You must provide either 'pal' or 'colors' (not both)")
if (missing(title) && inherits(values, "formula"))
title <- deparse(values[[2]])
values <- evalFormula(values, data)
type <- attr(pal, "colorType", exact = TRUE)
args <- attr(pal, "colorArgs", exact = TRUE)
na.color <- args$na.color
if (!is.null(na.color) && col2rgb(na.color, alpha = TRUE)[[4]] ==
0) {
na.color <- NULL
}
if (type != "numeric" && !missing(bins))
warning("'bins' is ignored because the palette type is not numeric")
if (type == "numeric") {
cuts <- if (length(bins) == 1)
pretty(values, bins)
else bins
if (length(bins) > 2)
if (!all(abs(diff(bins, differences = 2)) <=
sqrt(.Machine$double.eps)))
stop("The vector of breaks 'bins' must be equally spaced")
n <- length(cuts)
r <- range(values, na.rm = TRUE)
cuts <- cuts[cuts >= r[1] & cuts <= r[2]]
n <- length(cuts)
p <- (cuts - r[1])/(r[2] - r[1])
extra <- list(p_1 = p[1], p_n = p[n])
p <- c("", paste0(100 * p, "%"), "")
if (decreasing == TRUE){
if (is.null(labels)) {labels <- rev(labFormat(type = "numeric", cuts))}
colors <- pal(rev(c(r[1], cuts, r[2])))
labels <- labels
}else{
if (is.null(labels)) {labels <- labFormat(type = "numeric", cuts)}
colors <- pal(c(r[1], cuts, r[2]))
labels <- labels
}
colors <- paste(colors, p, sep = " ", collapse = ", ")
}
else if (type == "bin") {
cuts <- args$bins
n <- length(cuts)
mids <- (cuts[-1] + cuts[-n])/2
if (decreasing == TRUE){
colors <- pal(rev(mids))
labels <- rev(labFormat(type = "bin", cuts))
}else{
colors <- pal(mids)
labels <- labFormat(type = "bin", cuts)
}
}
else if (type == "quantile") {
p <- args$probs
n <- length(p)
cuts <- quantile(values, probs = p, na.rm = TRUE)
mids <- quantile(values, probs = (p[-1] + p[-n])/2, na.rm = TRUE)
if (decreasing == TRUE){
colors <- pal(rev(mids))
if(is.null(labels)) {labels = rev(labFormat(type = "quantile", cuts, p))}
labels <- labels
}else{
colors <- pal(mids)
if(is.null(labels)) {labels = labFormat(type = "quantile", cuts, p)}
labels <- labels
}
}
else if (type == "factor") {
v <- sort(unique(na.omit(values)))
colors <- pal(v)
labels <- labFormat(type = "factor", v)
if (decreasing == TRUE){
colors <- pal(rev(v))
labels <- rev(labFormat(type = "factor", v))
}else{
colors <- pal(v)
labels <- labFormat(type = "factor", v)
}
}
else stop("Palette function not supported")
if (!any(is.na(values)))
na.color <- NULL
}
else {
if (length(colors) != length(labels))
stop("'colors' and 'labels' must be of the same length")
}
legend <- list(colors = I(unname(colors)), labels = I(unname(labels)),
na_color = na.color, na_label = na.label, opacity = opacity,
position = position, type = type, title = title, extra = extra,
layerId = layerId, className = className, group = group)
invokeMethod(map, data, "addLegend", legend)
}
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