#' A Studio Ghibli palette generator
#'
#' These are some color palettes from Studio Ghibli films.
#' All color schemes are derived from
#' \href{https://moviesincolor.com/post/145269683743/i-got-to-make-some-color-palettes-for-the-best}{Movies In Color}.
#'
#' @param n Number of colors desired. All palettes now only have seven colors.
#' If omitted, uses all colours.
#'
#' @param name Name of desired palette.
#' @param direction Either `1` or `-1`. If `-1` the palette will be reversed.
#' @param type Either "continuous" or "discrete". Use continuous if you want
#' to automatically interpolate between colours.
#' @return A vector of colours.
#' @export
#' @keywords colors
#' @examples
#' ghibli_palette("PonyoLight")
#' ghibli_palette("LaputaMedium")
#' ghibli_palette("SpiritedDark")
#' ghibli_palette("MarnieMedium2", 3)
#'
#' # If you need more colours than normally found in a palette, you
#' # can use a continuous palette to interpolate between existing
#' # colours
#' pal <- ghibli_palette(name = "YesterdayLight", n = 21, type = "continuous")
ghibli_palette <- function(name, n, direction = 1, type = c("discrete", "continuous")) {
if (abs(direction) != 1) {
stop("direction must be 1 or -1")
}
pal <- ghibli_palettes[[name]]
if (is.null(pal))
stop("Palette not found.")
if (missing(n)) {
n <- length(pal)
}
type <- match.arg(type)
if (type == "discrete" && n > length(pal)) {
stop(paste0("Number of requested colors greater than what palette can offer, which is ",
length(pal), "."))
}
out <- switch(type,
continuous = colorRampPalette(pal)(n),
discrete = pal[1:n]
)
if (direction == -1) {
out <- rev(out)
}
structure(out, class = "palette", name = name)
}
pal_pal <- function(name, direction) {
function(n) {
ghibli_palette(name = name, direction = direction)
}
}
#' @export
print.palette <- function(x, ...) {
n <- length(x)
old <- par(mar = c(0.5, 0.5, 0.5, 0.5))
on.exit(par(old))
image(1:n, 1, as.matrix(1:n), col = x,
ylab = "", xaxt = "n", yaxt = "n", bty = "n")
rect(0, 0.9, n + 1, 1.1, col = rgb(1, 1, 1, 0.8), border = NA)
text((n + 1) / 2, 1, labels = attr(x, "name"), cex = 1, family = "serif")
}
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