# a linear colour ramp for continuous input
color_gradient <- function(palette) {
UseMethod("color_gradient")
}
color_gradient.character <- function(palette) {
tidyassert::assert(is_rgba_color(palette))
color_gradient(function(n) palette)
}
color_gradient.function <- function(palette) {
# function is a ramp built with scales::colour_ramp
if (isTRUE(attr(palette, "safe_palette_func"))) return(palette)
# assume palette takes a length param
function(x) {
colors <- suppressWarnings(palette(256))
ramp <- scales::colour_ramp(colors[!is.na(colors)])
ramp(x)
}
}
# a linear colour ramp for discrete input
color_categories <- function(palette) {
UseMethod("color_categories")
}
color_categories.character <- function(palette) {
tidyassert::assert(is_rgba_color(palette))
color_categories(scales::manual_pal(palette))
}
color_categories.function <- function(palette) {
rescale <- function(x, levels) scales::rescale(match(x, levels))
# function is a ramp built with scales::colour_ramp
if (isTRUE(attr(palette, "safe_palette_func"))) {
ramp <- function(x) {
levels <- get_levels(x)
palette(rescale(x, levels))
}
return(ramp)
}
# assume palette takes a length param
function(x) {
levels <- get_levels(x)
colors <- palette(length(levels))
ramp <- scales::colour_ramp(colors[!is.na(colors)])
ramp(rescale(x, levels))
}
}
# a linear numeric ramp for continous input
number_gradient <- function(seq) {
UseMethod("number_gradient")
}
number_gradient.numeric <- function(seq) {
tidyassert::assert(all_finite(seq) && length(seq) >= 2)
stats::approxfun(scales::rescale(seq_along(seq)), seq)
}
number_gradient.integer <- number_gradient.numeric
# a linear numeric ramp for discrete input
number_categories <- function(seq) UseMethod("number_categories")
number_categories.numeric <- function(seq) {
tidyassert::assert(all_finite(seq) && length(seq) >= 2)
seq_pal <- scales::manual_pal(seq)
function(x) {
levels <- get_levels(x)
# pull at least 2 values
values <- seq_pal(max(length(levels), 2))
ramp <- number_gradient(values[!is.na(values)])
ramp(scales::rescale(match(x, levels)))
}
}
number_categories.integer <- number_categories.numeric
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