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# Main functions ----------------------------------------------------------
#' Rectangular rugs in the margins
#'
#' @description Like rug plots display data points of a 2D plot as lines in the
#' margins, this function plots rectangles in the margins. Rectangular rugs
#' are convenient for displaying one-dimensional, ranged annotations for
#' two-dimensional plots.
#'
#' @inheritParams ggplot2::geom_rect
#' @param outside `logical` of length 1 that controls whether to move the
#' rectangles outside of the plot area. For the best results, it is probably
#' best to set `coord_cartesian(clip = "off")` and avoid overlap with the
#' default axes by changing the sides argument to `"tr"`.
#' @param sides A `string` of length 1 that controls which sides of the
#' plot the rug-rectangles appear on. A string containing any letters in
#' `"trbl"` will set it to top, right, bottom and left respectively.
#' @param length A [grid::unit()] object that sets the width and
#' height of the rectangles in the x- and y-directions respectively. Note that
#' scale expansion can affect the look of this.
#'
#' @details By default, scales are expanded 5\% on either side of the plot,
#' whereas the rug rectangles will occupy 3\% of the total plot size by
#' default. The `geom_rectmargin()` and `geom_tilemargin()` versions do the
#' same thing, but are parametrised differently; see
#' [`geom_rect()`][ggplot2::geom_tile].
#'
#' These functions do not have hard-coded required aesthetics, since the x and
#' y directions can be omitted by not choosing a side in the corresponding
#' direction, i.e. y-direction variables are omitted when plotting the rug only
#' on the top and/or bottom. This can result in errors when the aesthetics are
#' not specified appropriately, so some caution is advised.
#'
#' @export
#'
#' @return A *Layer* ggproto object.
#'
#' @importFrom ggplot2 layer
#'
#' @section Aesthetics:
#' `geom_rectmargin()` requires either one of the following
#' sets of aesthetics, but also can use both:
#'
#' \itemize{
#' \item **xmin**
#' \item **xmax**
#' }
#'
#' and/or:
#'
#' \itemize{
#' \item **ymin**
#' \item **ymax**
#' }
#'
#' `geom_tilemargin()` requires either one of the following
#' sets of aesthetics, but can also use both:
#'
#' \itemize{
#' \item **x**
#' \item **width**
#' }
#'
#' and/or:
#'
#' \itemize{
#' \item **y**
#' \item **height**
#' }
#'
#' Furthermore, `geom_rectmargin()` and `geom_tilemargin()` also
#' understand these shared aesthetics:
#'
#' \itemize{
#' \item alpha
#' \item colour
#' \item fill
#' \item group
#' \item linetype
#' \item size
#' }
#'
#' @seealso [ggplot2::geom_rug()], [`geom_rect()`][ggplot2::geom_tile],
#' [ggplot2::geom_tile()]
#'
#' @examples
#' # geom_rectmargin() is parameterised by the four corners
#' df <- data.frame(
#' xmin = c(1, 5),
#' xmax = c(2, 7),
#' ymin = c(1, 2),
#' ymax = c(2, 4),
#' fill = c("A", "B")
#' )
#'
#'
#' ggplot(df, aes(xmin = xmin, xmax = xmax,
#' ymin = ymin, ymax = ymax,
#' fill = fill)) +
#' geom_rect() +
#' geom_rectmargin()
#'
#' # geom_tilemargin() is parameterised by center and size
#' df <- data.frame(
#' x = c(1, 4),
#' y = c(1, 2),
#' width = c(2, 1),
#' height = c(1, 2),
#' fill = c("A", "B")
#' )
#'
#' ggplot(df, aes(x, y,
#' width = width, height = height,
#' fill = fill)) +
#' geom_tile() +
#' geom_tilemargin()
geom_rectmargin <- function(
mapping = NULL,
data = NULL,
stat = "identity",
position = "identity",
...,
outside = FALSE,
sides = "bl",
length = unit(0.03, "npc"),
linejoin = "mitre",
na.rm = FALSE,
show.legend = NA,
inherit.aes = TRUE
) {
layer(
data = data,
mapping = mapping,
stat = stat,
geom = GeomRectMargin,
position = position,
show.legend = show.legend,
inherit.aes = inherit.aes,
params = list2(
outside = outside,
sides = sides,
length = length,
na.rm = na.rm,
...
)
)
}
#' @rdname geom_rectmargin
#' @export
geom_tilemargin <- function(
mapping = NULL,
data = NULL,
stat = "identity",
position = "identity",
...,
outside = FALSE,
sides = "bl",
length = unit(0.03, "npc"),
linejoin = "mitre",
na.rm = FALSE,
show.legend = NA,
inherit.aes = TRUE
) {
layer(
data = data,
mapping = mapping,
stat = stat,
geom = GeomTileMargin,
position = position,
show.legend = show.legend,
inherit.aes = inherit.aes,
params = list2(
outside = outside,
sides = sides,
length = length,
na.rm = na.rm,
...
)
)
}
# ggproto -----------------------------------------------------------------
#' @usage NULL
#' @format NULL
#' @export
#' @rdname ggh4x_extensions
GeomRectMargin <- ggplot2::ggproto(
"GeomRectMargin", ggplot2::GeomRug,
draw_panel = function(
self, data, panel_params, coord, sides = "bl", outside = FALSE,
length = unit(0.03, "npc"), linejoin = "mitre"
) {
if (!inherits(length, "unit")) {
cli::cli_abort(
"The {.arg length} argument must be a {.cls unit} object."
)
}
rugs <- list()
coords <- coord$transform(data, panel_params)
if (inherits(coord, "CoordFlip")) {
sides <- chartr("tblr", "rlbt", sides)
}
rug_length <- if (!outside) {
list(min = length, max = unit(1, "npc") - length)
} else {
list(min = -1 * length, max = unit(1, "npc") + length)
}
gp <- grid::gpar(
col = alpha(coords$colour, coords$alpha),
fill = alpha(coords$fill, coords$alpha),
linejoin = linejoin,
lty = coords$linetype, lwd = coords$linewidth * .pt,
lineend = if (identical(linejoin, "round")) "round" else "square"
)
if (!is.null(coords$xmin)) {
if (grepl("b", sides)) {
rugs$x_b <- grid::rectGrob(
x = unit(coords$xmin, "native"),
y = unit(0, "npc"),
width = unit(coords$xmax - coords$xmin, "native"),
height = rug_length$min,
just = c("left", "bottom"),
gp = gp
)
}
if (grepl("t", sides)) {
rugs$x_t <- grid::rectGrob(
x = unit(coords$xmin, "native"),
y = unit(1, "npc"),
width = unit(coords$xmax - coords$xmin, "native"),
height = rug_length$min,
just = c("left", "top"),
gp = gp
)
}
}
if (!is.null(coords$ymin)) {
if (grepl("l", sides)) {
rugs$y_l <- grid::rectGrob(
x = unit(0, "npc"),
y = unit(coords$ymax, "native"),
width = rug_length$min,
height = unit(coords$ymax - coords$ymin, "native"),
just = c("left", "top"),
gp = gp
)
}
if (grepl("r", sides)) {
rugs$y_r <- grid::rectGrob(
x = unit(1, "npc"),
y = unit(coords$ymax, "native"),
width = rug_length$min,
height = unit(coords$ymax - coords$ymin, "native"),
just = c("right", "top"),
gp = gp
)
}
}
grid::gTree(children = do.call(grid::gList, rugs))
},
optional_aes = c("x", "y", "xmin", "xmax", "ymin", "ymax"),
default_aes = ggplot2::aes(colour = NA, fill = "grey35",
linewidth = 0.5, linetype = 1, alpha = NA),
draw_key = ggplot2::draw_key_polygon
)
#' @usage NULL
#' @format NULL
#' @export
#' @rdname ggh4x_extensions
GeomTileMargin <- ggplot2::ggproto(
"GeomTileMargin",
GeomRectMargin,
extra_params = c("na.rm"),
setup_data = function(data, params) {
data$width <- data$width %||% params$width %||% resolution(data$x, FALSE)
data$height <- data$height %||% params$height %||% resolution(data$y, FALSE)
transform(data,
xmin = x - width / 2, xmax = x + width / 2, width = NULL,
ymin = y - height / 2, ymax = y + height / 2, height = NULL
)
},
default_aes = ggplot2::aes(fill = "grey20", colour = NA,
linewidth = 0.1, linetype = 1,
alpha = NA, width = NA, height = NA),
draw_key = ggplot2::draw_key_polygon
)
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