72 lines
1.8 KiB
R
72 lines
1.8 KiB
R
#' Generate color palettes
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#'
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#' [palette_gen()] generates a color palette and let you choose whether continuous or discrete. [palette_gen_categorical()] and [palette_gen_sequential()] generates respectively discrete and continuous palettes.
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#'
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#' @param palette Palette name from [palette()].
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#' @param type "categorical" or "sequential" or "divergent".
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#' @param direction 1 or -1; should the order of colors be reversed?
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#' @param ... Additional arguments to pass to [colorRampPalette()] when type is "continuous".
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#'
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#' @export
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palette_gen <- function(palette, type, direction = 1, ...) {
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if (type %notin% c("categorical", "sequential", "divergent")) {
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rlang::abort("'type' must be categorical or continuous or divergent.")
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}
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if (type == "categorical") {
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return(palette_gen_categorical(palette = palette, direction = direction))
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}
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if (type %in% c("sequential", "divergent")) {
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return(palette_gen_sequential(
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palette = palette,
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direction = direction,
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...
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))
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}
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}
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#' @rdname palette_gen
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#'
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#' @export
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palette_gen_categorical <- function(palette = "cat_5_main", direction = 1) {
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if (abs(direction) != 1) {
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rlang::abort("Direction must be either 1 or -1.")
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}
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pal <- palette(palette)
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f <- function(n) {
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if (is.null(n)) {
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n <- length(pal)
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}
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if (n > length(pal)) {
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rlang::warn("Not enough colors in this palette!")
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}
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pal <- if (direction == 1) pal else rev(pal)
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pal <- pal[1:n]
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return(pal)
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}
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return(f)
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}
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#' @rdname palette_gen
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#'
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#' @export
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palette_gen_sequential <- function(palette = "seq_5_main", direction = 1, ...) {
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if (abs(direction) != 1) {
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rlang::abort("Direction must be either 1 or -1.")
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}
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pal <- palette(palette)
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pal <- if (direction == 1) pal else rev(pal)
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grDevices::colorRampPalette(pal, ...)
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}
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