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#' @rdname geom-docs
#' @export
geom_polygon_pattern <- function(mapping = NULL, data = NULL,
stat = "identity", position = "identity",
rule = "evenodd",
...,
na.rm = FALSE,
show.legend = NA,
inherit.aes = TRUE) {
layer(
data = data,
mapping = mapping,
stat = stat,
geom = GeomPolygonPattern,
position = position,
show.legend = show.legend,
inherit.aes = inherit.aes,
params = list2(
na.rm = na.rm,
rule = rule,
...
)
)
}
#' @rdname ggpattern-ggproto
#' @format NULL
#' @usage NULL
#' @export
GeomPolygonPattern <- ggproto("GeomPolygonPattern", GeomPolygon,
draw_panel = function(self, data, panel_params, coord, rule = "evenodd",
lineend = "butt", linejoin = "round", linemitre = 10) {
data <- check_linewidth(data, snake_class(self))
n <- nrow(data)
if (n == 1) return(zeroGrob())
munched <- coord_munch(coord, data, panel_params, is_closed = TRUE)
if (is.null(munched$subgroup)) {
# Sort by group to make sure that colors, fill, etc. come in same order
munched <- munched[order(munched$group), ]
# For gpar(), there is one entry per polygon (not one entry per point).
# We'll pull the first value from each group, and assume all these values
# are the same within each group.
first_idx <- !duplicated(munched$group)
first_rows <- munched[first_idx, ]
stopifnot(!is.null(munched$group))
polygons <- split(munched, munched$group)
boundary_dfs <- lapply(polygons, function(polygon) {
create_polygon_df(
x = polygon$x,
y = polygon$y
)
})
pattern_grobs <- create_pattern_grobs(first_rows, boundary_dfs)
col <- first_rows$colour
fill <- fill_alpha(first_rows$fill, first_rows$alpha)
lwd <- first_rows$linewidth * .pt
polygon_grob_fn <- function(col, fill, lwd) {
polygonGrob(
munched$x, munched$y, default.units = "native",
id = munched$group,
gp = gpar(
col = col,
fill = fill,
lwd = lwd,
lty = first_rows$linetype,
lineend = lineend,
linejoin = linejoin,
linemitre = linemitre
)
)
}
ggname(
"geom_polygon",
grobTree(
polygon_grob_fn(NA, fill, 0),
pattern_grobs,
polygon_grob_fn(col, NA, lwd)
)
)
} else {
if (getRversion() < "3.6") {
cli::cli_abort("Polygons with holes requires R 3.6 or above.")
}
# Sort by group to make sure that colors, fill, etc. come in same order
munched <- munched[order(munched$group, munched$subgroup), ]
id <- match(munched$subgroup, unique0(munched$subgroup))
# For gpar(), there is one entry per polygon (not one entry per point).
# We'll pull the first value from each group, and assume all these values
# are the same within each group.
first_idx <- !duplicated(munched$group)
first_rows <- munched[first_idx, ]
stopifnot(!is.null(munched$group))
polygons <- split(munched, munched$group)
boundary_grobs <- lapply(polygons, function(polygon) {
grid::pathGrob(polygon$x, polygon$y,
default.units = "npc",
gp = gpar(col = NA, lwd = 0, fill = "white"),
id = polygon$subgroup, rule = rule)
})
pattern_grobs <- create_pattern_grobs(first_rows, boundary_grobs)
gp_fill <- grid::gpar(
col = NA,
fill = fill_alpha(first_rows$fill, first_rows$alpha),
lwd = 0
)
gp_border <- grid::gpar(
col = first_rows$colour,
fill = NA,
lwd = first_rows$linewidth * .pt,
lty = first_rows$linetype,
lineend = lineend,
linejoin = linejoin,
linemitre = linemitre
)
path_grob_fn <- function(gp = gpar()) {
grid::pathGrob(
munched$x, munched$y, default.units = "native",
id = id, pathId = munched$group,
rule = rule,
gp = gp)
}
ggname(
"geom_polygon",
grid::grobTree(
path_grob_fn(gp_fill), # area filled of the polygon
pattern_grobs, # the pattern fill
path_grob_fn(gp_border) # the edge of the polygon
)
)
}
},
default_aes = defaults(aes(colour = NA, fill = "grey20", linewidth = 0.5, linetype = 1,
alpha = NA, subgroup = NULL),
pattern_aesthetics
),
draw_key = function(self, ...) draw_key_polygon_pattern(...),
rename_size = TRUE
)
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