power_palette <- c(
"#3f5a9a",
"#e9bf93",
"#a56c31",
"#bfcde1",
"#866e7f",
"#738dba",
"#714120",
"#548cc6"
)
#' @title Powerslave palette
#' @description Colour palette based on Iron Maiden's Powerslave album sleeve.
#' @inheritDotParams ggplot2::discrete_scale
#' @param n number of colors
#' @param type discrete or continuous
#' @param reverse reverse order, Default: FALSE
#' @rdname power_pal
#' @examples
#' library(scales)
#' show_col(power_pal()(8))
#' @export
#' @importFrom scales manual_pal
#' @importFrom glue glue
#' @importFrom grDevices colorRampPalette
power_pal <- function(n, type = c("discrete", "continuous"),
reverse = FALSE){
power <- power_palette
if (reverse == TRUE) {
power <- rev(power)
}
if (missing(n)) {
n <- length(power)
}
type <- match.arg(type)
if (type == "discrete" && n > length(power)) {
stop(glue::glue("Palette does not have {n} colors, maximum is {length(power)}!"))
}
power <- switch(type,
continuous = grDevices::colorRampPalette(power)(n),
discrete = power[1:n])
power <- scales::manual_pal(power)
return(power)
}
#' @title scale_color_power
#' @rdname power_pal
#' @export
#' @examples
#'
#' library(discovr)
#' library(ggplot2)
#'
#' # Get albums in the classic era from the discovr::eddiefy data.
#' # I'm not including fear of the dark because it's not in any way classic.
#' # No prayer for the dying was pushing its luck too if I'm honest.
#'
#' classic_era <- subset(eddiefy, year < 1992)
#'
#' # Plot some data and apply theme to color (note US English)
#'
#' ggplot(classic_era, aes(x = energy, y = valence, color = album_name)) +
#' geom_point(size = 2) +
#' theme_minimal() +
#' scale_color_power()
#' @importFrom ggplot2 discrete_scale scale_color_gradientn
scale_color_power <- function(n, type = "discrete",
reverse = FALSE, ...){
if (type == "discrete") {
ggplot2::discrete_scale("color", "power",
power_pal(n = n, type = type,
reverse = reverse), ...)
} else {
ggplot2::scale_color_gradientn(colors = power_pal(n = n, type = type,
reverse = reverse)(256))
}
}
#' @title scale_colour_power
#' @rdname power_pal
#' @export
#' @examples
#'
#' # Plot some data and apply theme to colour (note UK English)
#'
#' ggplot(classic_era, aes(x = energy, y = valence, color = album_name)) +
#' geom_point(size = 2) +
#' theme_minimal() +
#' scale_colour_power()
#' @importFrom ggplot2 discrete_scale scale_color_gradientn
scale_colour_power <- scale_color_power
#' @title scale_fill_power
#' @rdname power_pal
#' @export
#' @examples
#'
#' # Plot some data and apply theme to fill
#'
#' ggplot(classic_era, aes(x = album_name, y = valence, fill = album_name)) +
#' geom_violin() +
#' theme_minimal() +
#' theme(axis.text.x = element_text(angle = 90)) +
#' scale_fill_power()
#' @importFrom ggplot2 discrete_scale scale_fill_gradientn
scale_fill_power <- function(n, type = "discrete",
reverse = FALSE, ...){
if (type == "discrete") {
ggplot2::discrete_scale("fill", "power",
power_pal(n = n, type = type,
reverse = reverse), ...)
} else {
ggplot2::scale_fill_gradientn(colors = power_pal(n = n, type = type,
reverse = reverse)(256))
}
}
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