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##' geom_text2 support aes(subset) via setup_data
##'
##'
##' @title geom_text2
##' @param mapping the aesthetic mapping
##' @param data A layer specific dataset -
##' only needed if you want to override he plot defaults.
##' @param ... other arguments passed on to 'layer'
##' @param parse if TRUE, the labels will be passd into expressions
##' @param nudge_x horizontal adjustment
##' @param nudge_y vertical adjustment
##' @param label.padding Amount of padding around label.
##' @param label.r Radius of rounded corners.
##' @param label.size Size of label border, in mm
##' @param na.rm logical
##' @param show.legend logical
##' @param inherit.aes logical
##' @return label layer
##' @importFrom ggplot2 layer
##' @importFrom ggplot2 position_nudge
##' @export
##' @seealso
##' \link[ggplot2]{geom_label}
##' @author Guangchuang Yu
geom_label2 <- function(mapping = NULL, data = NULL,
...,
parse = FALSE,
nudge_x = 0,
nudge_y = 0,
label.padding = unit(0.25, "lines"),
label.r = unit(0.15, "lines"),
label.size = 0.25,
na.rm = TRUE,
show.legend = NA,
inherit.aes = TRUE) {
position = "identity"
if (!missing(nudge_x) || !missing(nudge_y)) {
if (!missing(position)) {
stop("Specify either `position` or `nudge_x`/`nudge_y`", call. = FALSE)
}
position <- position_nudge(nudge_x, nudge_y)
}
default_aes <- aes_(node=~node)
if (is.null(mapping)) {
mapping <- default_aes
} else {
mapping <- modifyList(mapping, default_aes)
}
layer(
data = data,
mapping = mapping,
stat = StatTreeData,
geom = GeomLabelGGtree,
position = position,
show.legend = show.legend,
inherit.aes = inherit.aes,
params = list(
parse = parse,
label.padding = label.padding,
label.r = label.r,
label.size = label.size,
na.rm = na.rm,
...
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)
}
##' @importFrom ggplot2 GeomLabel
GeomLabelGGtree <- ggproto("GeomLabelGGtree", GeomLabel,
setup_data = function(data, params) {
if (is.null(data$subset))
return(data)
data[data$subset,]
},
draw_panel = function(self, data, panel_scales, coord, parse = FALSE,
na.rm = FALSE,
label.padding = unit(0.25, "lines"),
label.r = unit(0.15, "lines"),
label.size = 0.25) {
GeomLabel$draw_panel(data, panel_scales, coord, parse,
na.rm, label.padding, label.r, label.size)
},
required_aes = c("node", "x", "y", "label"),
default_aes = aes(
colour = "black", fill = "white", size = 3.88, angle = 0,
hjust = 0.5, vjust = 0.5, alpha = NA, family = "", fontface = 1,
lineheight = 1.2
),
draw_key = draw_key_label
)
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