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geom-label-linked.r
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#' @rdname geom_text_s
#'
#' @param label.padding Amount of padding around label. Defaults to 0.25 lines.
#' @param label.r Radius of rounded corners. Defaults to 0.15 lines.
#'
#' @export
#'
geom_label_s <-
function(mapping = NULL,
data = NULL,
stat = "identity",
position = "identity",
...,
parse = FALSE,
nudge_x = 0,
nudge_y = 0,
default.colour = "black",
colour.target = c("text", "box"),
default.alpha = 1,
alpha.target = "all",
label.padding = grid::unit(0.25, "lines"),
label.r = grid::unit(0.15, "lines"),
segment.linewidth = 0.5,
add.segments = TRUE,
box.padding = 1e-06,
point.padding = 1e-06,
min.segment.length = 0,
arrow = NULL,
na.rm = FALSE,
show.legend = NA,
inherit.aes = TRUE) {
colour.target <-
rlang::arg_match(colour.target,
values = c("all", "text", "box", "box.line",
"segment", "none"),
multiple = TRUE)
alpha.target <-
rlang::arg_match(alpha.target,
values = c("all", "text", "box", "box.line", "box.fill",
"segment", "none"),
multiple = TRUE)
if (!missing(nudge_x) || !missing(nudge_y)) {
if (!missing(position) && position != "identity") {
rlang::abort("You must specify either `position` or `nudge_x`/`nudge_y`.")
}
# by default we keep the original positions
position <- position_nudge_keep(nudge_x, nudge_y)
}
ggplot2::layer(
data = data,
mapping = mapping,
stat = stat,
geom = GeomLabelS,
position = position,
show.legend = show.legend,
inherit.aes = inherit.aes,
params = list(
parse = parse,
default.colour = default.colour,
colour.target = colour.target,
default.alpha = default.alpha,
alpha.target = alpha.target,
label.padding = label.padding,
label.r = label.r,
segment.linewidth = segment.linewidth,
add.segments = add.segments,
box.padding = box.padding,
point.padding = point.padding,
min.segment.length = min.segment.length,
arrow = arrow,
na.rm = na.rm,
...
)
)
}
#' @rdname ggpp-ggproto
#' @format NULL
#' @usage NULL
#' @export
GeomLabelS <-
ggplot2::ggproto("GeomLabelS", ggplot2::Geom,
required_aes = c("x", "y", "label"),
default_aes = ggplot2::aes(
colour = "black",
fill = "white",
size = 3.88,
angle = 0, # currently ignored
linewidth = 0.25,
linetype = "solid",
hjust = "position",
vjust = "position",
alpha = 0.75, # ensure that occluded data are visible by default
family = "",
fontface = 1,
lineheight = 1.2
),
draw_panel = function(data, panel_params, coord, #panel_scales,
parse = FALSE,
na.rm = FALSE,
add.segments = TRUE,
default.colour = "black",
colour.target = "all",
default.alpha = 1,
alpha.target = "fill",
box.padding = 0.25,
point.padding = 1e-06,
min.segment.length = 0,
segment.linewidth = 0.5,
arrow = NULL,
label.padding = unit(0.25, "lines"),
label.r = unit(0.15, "lines")) {
add.segments <- add.segments && all(c("x_orig", "y_orig") %in% colnames(data))
data$label <- as.character(data$label)
data <- subset(data, !is.na(label) & label != "")
if (nrow(data) == 0L) {
return(nullGrob())
}
lab <- data$label
if (parse) {
lab <- parse_safe(lab)
}
data <- coord$transform(data, panel_params)
if (all(c("x_orig", "y_orig") %in% colnames(data))) {
data_orig <- data.frame(x = data$x_orig, y = data$y_orig)
data_orig <- coord$transform(data_orig, panel_params)
data$x_orig <- data_orig$x
data$y_orig <- data_orig$y
}
if (is.character(data$vjust)) {
data$vjust <-
compute_just2d(data = data,
coord = coord,
panel_params = panel_params,
just = data$vjust,
a = "y", b = "x")
}
if (is.character(data$hjust)) {
data$hjust <-
compute_just2d(data = data,
coord = coord,
panel_params = panel_params,
just = data$hjust,
a = "x", b = "y")
}
if (add.segments) {
segments.data <-
shrink_segments(data,
point.padding = point.padding,
box.padding = box.padding,
min.segment.length = min.segment.length)
}
# loop needed as gpar is not vectorized
all.grobs <- grid::gList()
for (row.idx in 1:nrow(data)) {
row <- data[row.idx, , drop = FALSE]
text.alpha <-
ifelse(any(alpha.target %in% c("all", "text")),
row$alpha, default.alpha)
segment.alpha <-
ifelse(any(alpha.target %in% c("all", "segment")),
row$alpha, default.alpha)
box.colour.alpha <-
ifelse(any(alpha.target %in% c("all", "box", "box.line")),
row$alpha, default.alpha)
box.fill.alpha <-
ifelse(any(alpha.target %in% c("all", "box", "box.fill")),
row$alpha, default.alpha)
user.grob <- labelGrob(lab[row.idx],
x = unit(row$x, "native"),
y = unit(row$y, "native"),
just = c(row$hjust, row$vjust),
padding = label.padding,
r = label.r,
text.gp = gpar(
col = ifelse(any(colour.target %in% c("all", "text")),
ggplot2::alpha(row$colour, text.alpha),
ggplot2::alpha(default.colour, text.alpha)),
fontsize = row$size * .pt,
fontfamily = row$family,
fontface = row$fontface,
lineheight = row$lineheight
),
rect.gp = gpar(
col = if (row$linewidth == 0) NA else # lwd = 0 is invalid in 'grid'
ifelse(any(colour.target %in% c("all", "box")),
ggplot2::alpha(row$colour, box.colour.alpha),
ggplot2::alpha(default.colour, box.colour.alpha)),
fill = alpha(row$fill, box.fill.alpha),
# lwd = (if (row$linewidth == 0) 1 else row$linewidth) * .pt, # mm -> points (as in 'ggplot2')
lwd = (if (row$linewidth == 0) 0.5 else row$linewidth) * ggplot2::.stroke, # mm -> stroke (correct)
lty = row$linetype
)
)
# give unique name to each grob
user.grob$name <- paste("text.s.grob", row$group, row.idx, sep = ".")
if (add.segments) {
segment.row <- segments.data[row.idx, , drop = FALSE]
if (segment.row$too.short) {
segment.grob <- grid::nullGrob()
} else {
segment.grob <-
grid::segmentsGrob(x0 = segment.row$x,
y0 = segment.row$y,
x1 = segment.row$x_orig,
y1 = segment.row$y_orig,
arrow = arrow,
gp = grid::gpar(
col = if (segment.linewidth == 0) NA else # lwd = 0 is invalid in 'grid'
ifelse(any(colour.target %in% c("all", "segment")),
ggplot2::alpha(row$colour, segment.alpha),
ggplot2::alpha(default.colour, segment.alpha)),
lwd = (if (segment.linewidth == 0) 0.5 else segment.linewidth) * ggplot2::.stroke),
name = paste("text.s.segment", row$group, row.idx, sep = "."))
}
all.grobs <- grid::gList(all.grobs, segment.grob, user.grob)
} else {
all.grobs <- grid::gList(all.grobs, user.grob)
}
}
# name needs to be unique within plot, so we would to know layer
# grid::grobTree(children = all.grobs, name = "geom.text.s.panel")
grid::grobTree(children = all.grobs)
},
draw_key = draw_key_text
)
labelGrob <-
function(label, x = grid::unit(0.5, "npc"), y = grid::unit(0.5, "npc"),
just = "center", padding = grid::unit(0.25, "lines"), r = grid::unit(0.1, "snpc"),
default.units = "npc", name = NULL,
text.gp = grid::gpar(), rect.gp = grid::gpar(fill = "white"), vp = NULL) {
if (length(label) != 1) {
rlang::abort("label must be of length 1")
}
if (!grid::is.unit(x))
x <- grid::unit(x, default.units)
if (!grid::is.unit(y))
y <- grid::unit(y, default.units)
grid::gTree(label = label, x = x, y = y, just = just, padding = padding, r = r,
name = name, text.gp = text.gp, rect.gp = rect.gp, vp = vp, cl = "labelgrob")
}