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#' Complete list of palettes
#'
#' Use \code{\link{iheid_palette}} to construct palettes of desired length.
#'
#' @export
iheid_palettes <- list("IHEID" = c("IHEIDRed" = "#E20020",
"IHEIDBlack" = "#5c666f",
"IHEIDGrey" = "#6f7072"),
"Centres" = c("AHCD" = "#622550",
"CFFD" = "#0094D8",
"CIES" = "#268D2B",
"CTEI" = "#008F92",
"CGEN" = "#820C2B",
"CCDP" = "#3E2682",
"GLGC" = "#006564",
"GLHC" = "#A8086E",
"GLMC" = "#006EAA"),
"SDGs" = c("NoPoverty" = "#e5243b",
"ZeroHunger" = "#DDA63A",
"GoodHealth" = "#4C9F38",
"QualityEducation" = "#C5192D",
"GenderEquality" = "#FF3A21",
"CleanWater" = "#26BDE2",
"CleanEnergy" = "#FCC30B",
"EconomicGrowth" = "#A21942",
"Innovation" = "#FD6925",
"ReducedInequalities" = "#DD1367",
"SustainableCities" = "#FD9D24",
"ResponsibleConsumption" = "#BF8B2E",
"ClimateAction" = "#3F7E44",
"BelowWater" = "#0A97D9",
"OnLand" = "#56C02B",
"StrongInstitutions" = "#00689D",
"GoalPartnerships" = "#19486A"))
#' An IHEID palette generator
#'
#' These are a few color palettes useful for members of the Geneva Graduate Institute.
#' This function calls one of three official palettes in
#' \code{\link{iheid_palette}}: for the Institute, for the Centres, and for the
#' SDGs.
#'
#' @param n Number of colors desired. If omitted, uses all colours.
#' @param name Name of desired palette. Current choices are:
#' \code{IHEID}, \code{Centres}, and \code{SDGs}.
#' @param type Either "continuous" or "discrete". Use continuous if you want
#' to automatically interpolate between colours.
#' @importFrom graphics rect par image text
#' @return A vector of colours.
#' @source Adapted from
#' \url{https://github.com/karthik/wesanderson/blob/master/R/colors.R}
#' @export
#' @keywords colors
#' @examples
#' iheid_palette("IHEID")
#' iheid_palette("Centres")
#' iheid_palette("SDGs")
#'
#' # If you need more colours than normally found in a palette, you
#' # can use a continuous palette to interpolate between existing
#' # colours
#' pal <- iheid_palette(21, name = "Centres", type = "continuous")
#' image(volcano, col = pal)
iheid_palette <- function(name, n, type = c("discrete", "continuous")) {
type <- match.arg(type)
pal <- iheid_palettes[[name]]
if (is.null(pal))
stop("Palette not found.")
if (missing(n)) {
n <- length(pal)
}
if (type == "discrete" && n > length(pal)) {
stop("Number of requested colors greater than what palette can offer")
}
out <- switch(type,
continuous = grDevices::colorRampPalette(pal)(n),
discrete = pal[1:n]
)
structure(out, class = "palette", name = name)
}
#' @export
#' @importFrom graphics rect par image text
#' @importFrom grDevices rgb
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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