Add Tailwind CSS v3 color scales

NAMESPACE

@@ -22,11 +22,13 @@ export(pal_rickandmorty)
 export(pal_simpsons)
 export(pal_startrek)
 export(pal_tron)
+export(pal_tw3)
 export(pal_uchicago)
 export(pal_ucscgb)
 export(rgb_bs5)
 export(rgb_gsea)
 export(rgb_material)
+export(rgb_tw3)
 export(scale_color_aaas)
 export(scale_color_bmj)
 export(scale_color_bs5)
@@ -49,6 +51,7 @@ export(scale_color_rickandmorty)
 export(scale_color_simpsons)
 export(scale_color_startrek)
 export(scale_color_tron)
+export(scale_color_tw3)
 export(scale_color_uchicago)
 export(scale_color_ucscgb)
 export(scale_colour_aaas)
@@ -73,6 +76,7 @@ export(scale_colour_rickandmorty)
 export(scale_colour_simpsons)
 export(scale_colour_startrek)
 export(scale_colour_tron)
+export(scale_colour_tw3)
 export(scale_colour_uchicago)
 export(scale_colour_ucscgb)
 export(scale_fill_aaas)
@@ -97,6 +101,7 @@ export(scale_fill_rickandmorty)
 export(scale_fill_simpsons)
 export(scale_fill_startrek)
 export(scale_fill_tron)
+export(scale_fill_tw3)
 export(scale_fill_uchicago)
 export(scale_fill_ucscgb)
 importFrom(ggplot2,discrete_scale)

R/continuous-tw3.R

@@ -0,0 +1,168 @@
+#' Tailwind CSS color palettes
+#'
+#' Tailwind CSS color palettes.
+#'
+#' @param palette Palette type. There are 22 available options:
+#'   - `"slate"`
+#'   - `"gray"`
+#'   - `"zinc"`
+#'   - `"neutral"`
+#'   - `"stone"`
+#'   - `"red"`
+#'   - `"orange"`
+#'   - `"amber"`
+#'   - `"yellow"`
+#'   - `"lime"`
+#'   - `"green"`
+#'   - `"emerald"`
+#'   - `"teal"`
+#'   - `"cyan"`
+#'   - `"sky"`
+#'   - `"blue"`
+#'   - `"indigo"`
+#'   - `"violet"`
+#'   - `"purple"`
+#'   - `"fuchsia"`
+#'   - `"pink"`
+#'   - `"rose"`
+#' @param n Number of individual colors to be generated.
+#' @param alpha Transparency level, a real number in (0, 1].
+#'   See `alpha` in [grDevices::rgb()] for details.
+#' @param reverse Logical. Should the order of the colors be reversed?
+#'
+#' @export rgb_tw3
+#'
+#' @importFrom grDevices colorRamp rgb
+#' @importFrom scales manual_pal
+#'
+#' @author Nan Xiao | \email{[email protected]} | <https://nanx.me>
+#'
+#' @references
+#' <https://tailwindcss.com/docs/customizing-colors>
+#'
+#' @examples
+#' library("scales")
+#' show_col(pal_tw3("rose")(10))
+#' show_col(pal_tw3("rose", n = 30, alpha = 0.6, reverse = TRUE)(30))
+rgb_tw3 <- function(
+    palette = c(
+      "slate", "gray", "zinc", "neutral", "stone", "red", "orange", "amber",
+      "yellow", "lime", "green", "emerald", "teal", "cyan", "sky", "blue",
+      "indigo", "violet", "purple", "fuchsia", "pink", "rose"
+    ), n = 10, alpha = 1, reverse = FALSE) {
+  palette <- match.arg(palette)
+
+  if (alpha > 1L || alpha <= 0L) stop("alpha must be in (0, 1]")
+
+  raw_cols <- ggsci_db$"tw3"[[palette]]
+  func_cols <- colorRamp(raw_cols, space = "Lab", interpolate = "spline")
+  mat_cols <- func_cols(seq(0L, 1L, length.out = n))
+  alpha_cols <- rgb(
+    mat_cols[, 1L], mat_cols[, 2L], mat_cols[, 3L],
+    alpha = alpha * 255L, maxColorValue = 255L
+  )
+
+  if (reverse) alpha_cols <- rev(alpha_cols)
+
+  alpha_cols
+}
+
+#' Tailwind CSS color palettes
+#'
+#' Tailwind CSS color palettes.
+#'
+#' @inheritParams rgb_tw3
+#'
+#' @export pal_tw3
+#'
+#' @importFrom scales manual_pal
+#'
+#' @author Nan Xiao | \email{[email protected]} | <https://nanx.me>
+#'
+#' @examples
+#' library("scales")
+#' show_col(pal_tw3("rose")(10))
+#' show_col(pal_tw3("rose", n = 30, alpha = 0.6, reverse = TRUE)(30))
+pal_tw3 <- function(
+    palette = c(
+      "slate", "gray", "zinc", "neutral", "stone", "red", "orange", "amber",
+      "yellow", "lime", "green", "emerald", "teal", "cyan", "sky", "blue",
+      "indigo", "violet", "purple", "fuchsia", "pink", "rose"
+    ), n = 10, alpha = 1, reverse = FALSE) {
+  palette <- match.arg(palette)
+
+  alpha_cols <- rgb_tw3(palette, n, alpha, reverse)
+  manual_pal(unname(alpha_cols))
+}
+
+#' Tailwind CSS color scales
+#'
+#' See [pal_tw3()] for details.
+#'
+#' @inheritParams pal_tw3
+#' @param ... Additional parameters for [ggplot2::discrete_scale()].
+#'
+#' @export scale_color_tw3
+#'
+#' @importFrom ggplot2 scale_color_gradientn
+#'
+#' @author Nan Xiao | \email{[email protected]} | <https://nanx.me>
+#'
+#' @rdname scale_tw3
+#'
+#' @examples
+#' library("ggplot2")
+#'
+#' data("mtcars")
+#' cor <- abs(cor(mtcars))
+#' cor_melt <- data.frame(
+#'   Var1 = rep(seq_len(nrow(cor)), times = ncol(cor)),
+#'   Var2 = rep(seq_len(ncol(cor)), each = nrow(cor)),
+#'   value = as.vector(cor)
+#' )
+#'
+#' ggplot(
+#'   cor_melt,
+#'   aes(x = Var1, y = Var2, fill = value)
+#' ) +
+#'   geom_tile(colour = "black", size = 0.3) +
+#'   theme_bw() +
+#'   scale_fill_tw3("slate")
+scale_color_tw3 <- function(
+    palette = c(
+      "slate", "gray", "zinc", "neutral", "stone", "red", "orange", "amber",
+      "yellow", "lime", "green", "emerald", "teal", "cyan", "sky", "blue",
+      "indigo", "violet", "purple", "fuchsia", "pink", "rose"
+    ), alpha = 1, reverse = FALSE, ...) {
+  palette <- match.arg(palette)
+  scale_color_gradientn(
+    colours = rgb_tw3(
+      palette,
+      n = 512, alpha = alpha, reverse = reverse
+    ),
+    ...
+  )
+}
+
+#' @export scale_colour_tw3
+#' @rdname scale_tw3
+scale_colour_tw3 <- scale_color_tw3
+
+#' @export scale_fill_tw3
+#' @importFrom ggplot2 scale_fill_gradientn
+#' @rdname scale_tw3
+scale_fill_tw3 <- function(
+    palette = c(
+      "slate", "gray", "zinc", "neutral", "stone", "red", "orange", "amber",
+      "yellow", "lime", "green", "emerald", "teal", "cyan", "sky", "blue",
+      "indigo", "violet", "purple", "fuchsia", "pink", "rose"
+    ), alpha = 1, reverse = FALSE, ...) {
+  palette <- match.arg(palette)
+  scale_fill_gradientn(
+    colours = rgb_tw3(
+      palette,
+      n = 512, alpha = alpha, reverse = reverse
+    ),
+    ...
+  )
+}