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# External constructors ---------------------------------------------------
#' Manual position scales
#'
#' @description
#' `r lifecycle::badge("experimental")`
#'
#' `scale_x_manual()` and `scale_y_manual()` are hybrid discrete and continuous
#' position scales for the `x` and `y` aesthetics. These accept input like
#' [discrete scales][ggplot2::scale_x_discrete], but may map these discrete
#' values to continuous values that needn't be equally spaced.
#'
#' @param values A `numeric` vector with the same length as unique values.
#' Alternatively, a function that accepts the limits (unique values) as
#' determined from the data and returns a `numeric` vector parallel to the
#' input.
#' @param c_limits Either `NULL` (default) to accept the range of `values` as
#' the continuous limits, or a `numeric(2)` to set custom continuous limits.
#' @inheritParams ggplot2::discrete_scale
#' @inheritDotParams ggplot2::discrete_scale -aesthetics -palette
#'
#' @details
#' Many thanks to Constantin Ahlmann-Eltze for discussion and suggesting
#' the adoption of this functionality in ggh4x.
#'
#' @note
#' There currently is a known bug wherein a `c_limits` cannot be applied
#' correctly when that range is within the range of the discrete limits.
#'
#' @return A `<ScaleManualPosition>` object that can be added to a plot.
#' @export
#'
#' @seealso [sep_discrete()]
#'
#' @examples
#' # A boxplot with interactions
#' p <- ggplot(mpg, aes(interaction(year, cyl), displ)) +
#' geom_boxplot()
#'
#' # Manually setting positions
#' p + scale_x_manual(values = c(1, 2, 4, 6, 7, 9, 10))
#'
#' # Using a function to separate grouped labels
#' p + scale_x_manual(values = sep_discrete())
#'
#' # Expanding the continuous limits
#' p + scale_x_manual(values = sep_discrete(), c_limits = c(NA, 15))
#'
#' # Together with grouped axis
#' p + scale_x_manual(values = sep_discrete(), guide = guide_axis_nested())
scale_x_manual <- function(
values,
c_limits = NULL,
position = "bottom",
...
) {
scale_position_manual(
c("x", "xmin", "xmax", "xend"),
values = values,
c_limits = c_limits,
position = position,
...
)
}
#' @rdname scale_x_manual
#' @export
scale_y_manual <- function(
values,
c_limits = NULL,
position = "left",
...
) {
scale_position_manual(
c("y", "ymin", "ymax", "yend"),
values = values,
c_limits = c_limits,
position = position,
...
)
}
# Internal constructor ----------------------------------------------------
scale_position_manual <- function(
aesthetics = c("x", "xmin", "xmax", "xend"),
values = NULL,
...,
limits = NULL,
c_limits = NULL,
breaks = waiver(),
expand = waiver(),
guide = waiver(),
position = "bottom",
env = caller_env()
) {
force(values)
if (!is.function(values)) {
if (!is.numeric(values)) {
cli::cli_abort(
"The {.arg values} argument must be {.cls numeric}.",
call = env
)
}
if (is.null(limits) && !is.null(names(values))) {
limits <- function(x) intersect(x, names(values)) %||% character()
}
if (is.vector(values) && is.null(names(values))
&& !inherits(breaks, "waiver") &&
!is.null(breaks) && !is.function(breaks)) {
if (length(breaks) <= length(values)) {
names(values) <- breaks
} else {
names(values) <- breaks[1:length(values)]
}
}
pal <- function(limits) {
if (length(limits) > length(values)) {
cli::cli_abort(
"Insufficient values in manual scale. {length(limits)} needed \\
but {length(values)} provided."
)
}
values[seq_along(limits)]
}
} else {
pal <- values
}
if (!is.null(c_limits) && (!is.numeric(c_limits) || length(c_limits) != 2)) {
cli::cli_abort(
"The {.arg c_limits} argument must either be {.code NULL} or a \\
{.cls numeric} vector of length 2."
)
}
sc <- discrete_scale(
aesthetics,
"position_d",
pal,
...,
expand = expand,
guide = guide,
position = position,
super = ScaleManualPosition
)
sc$range_c <- ContinuousRange$new()
sc$c_limits <- c_limits
sc
}
# ggproto class -----------------------------------------------------------
ScaleManualPosition <- ggproto(
"ScaleManualPosition", ScaleDiscretePosition,
train = function(self, x) {
if (is.discrete(x)) {
self$range$train(x, drop = self$drop, na.rm = !self$na.translate)
range <- range(self$palette(self$get_limits()))
}
if (!is.discrete(x)) {
range <- range(x)
}
if (!is.null(self$c_limits)) {
range <- ifelse(is.na(self$c_limits), range, self$c_limits)
}
# Hack for scale expansion
expand <- self$expand %|W|% expansion(add = 0.6)
lower <- expand_range(range, expand[1], expand[2])[1]
upper <- expand_range(range, expand[3], expand[4])[2]
self$range_c$train(c(lower, upper))
},
map = function(self, x, limits = self$get_limits()) {
if (is.discrete(x)) {
n <- sum(!is.na(limits))
if (!is.null(self$n.breaks.cache) && self$n.breaks.cache == n) {
pal <- self$palette.cache
} else {
if (!is.null(self$n.breaks.cache)) {
cli::cli_warn("Cached palette does not match requested.")
}
pal <- self$palette(limits)
self$palette.cache <- pal
self$n.breaks.cache <- n
}
if (!is_null(names(pal))) {
idx_nomatch <- is.na(match(names(pal), limits))
pal[idx_nomatch] <- NA
pal_match <- pal[match(as.character(x), names(pal))]
pal_match <- unname(pal_match)
} else {
pal_match <- pal[match(as.character(x), limits)]
}
if (self$na.translate) {
pal_match[is.na(x) | is.na(pal_match)] <- self$na.value
}
x <- pal_match
}
mapped_discrete(as.double(x))
}
)
# Helpers -----------------------------------------------------------------
#' Separator for discrete grouped labels
#'
#' This is a function factory that provides a function to split grouped discrete
#' labels into numerical positions.
#'
#' @param sep A `character(1)` separator to use for splitting. May not contain
#' regular expressions.
#' @param inv A `logical(1)` whether to invert the layering of groups.
#'
#' @return A `function` that accepts `character` input and returns
#' `numeric` output.
#' @export
#'
#' @examples
#' # Here, 'bar.qux' belongs to the second group, so has +1 value
#' sep_discrete()(c("foo.bar", "bar.bar", "bar.qux"))
#'
#' # Now, the values are grouped by the groups before the separator
#' sep_discrete(inv = TRUE)(c("foo.bar", "bar.bar", "bar.qux"))
sep_discrete <- function(sep = ".", inv = FALSE) {
force(sep)
force(inv)
function(limits) {
split <- strsplit(limits, sep, fixed = TRUE)
lengs <- lengths(split)
depth <- max(lengs)
if (!all(lengs == depth)) {
split <- lapply(split, function(lab) {
c(lab, rep("", depth - length(lab)))
})
}
split <- do.call(rbind, split)
if (isTRUE(inv)) {
split <- split[, rev(seq_len(ncol(split))), drop = FALSE]
}
vals <- apply(split, 2, function(x) {
unrep <- vec_unrep(x)
rep(vec_seq_along(unrep$key) - 1L, unrep$times)
})
if (nrow(split) == 1) {
dim(vals) <- c(1, length(vals))
}
vals[, 1] <- seq_len(nrow(vals))
rowSums(vals)
}
}
is.discrete <- function(x) {
is.factor(x) || is.character(x) || is.logical(x)
}
mapped_discrete <- function(x = double()) {
if (is.null(x)) return(NULL)
vec_assert(as.vector(x), double())
class(x) <- c("mapped_discrete", "numeric")
x
}
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