#' Confident-Box Geom
#'
#' @param width the width of confident box.
#' @inheritParams ggplot2::layer
#' @inheritParams ggplot2::geom_polygon
#' @section Aesthetics:
#' \code{geom_confbox()} understands the following aesthetics (required
#' aesthetics are in bold):
#' \itemize{
#' \item \strong{\code{x}}
#' \item \strong{\code{y}}
#' \item \strong{\code{r}}
#' \item \strong{\code{lower.ci}}
#' \item \strong{\code{upper.ci}}
#' \item \code{alpha}
#' \item \code{colour}
#' \item \code{confline.col}
#' \item \code{midline.col}
#' \item \code{fill}
#' \item \code{linetype}
#' \item \code{size}
#' }
#' @importFrom ggplot2 layer ggproto Geom GeomPolygon GeomSegment aes draw_key_polygon
#' @importFrom grid grobTree
#' @rdname geom_confbox
#' @author Houyun Huang, Lei Zhou, Jian Chen, Taiyun Wei
#' @export
geom_confbox <- function(mapping = NULL, data = NULL,
stat = "identity", position = "identity",
...,
width = 0.5,
na.rm = FALSE,
show.legend = NA,
inherit.aes = TRUE) {
layer(
data = data,
mapping = mapping,
stat = stat,
geom = GeomConfbox,
position = position,
show.legend = show.legend,
inherit.aes = inherit.aes,
params = list(
width = width,
na.rm = na.rm,
...
)
)
}
#' @rdname geom_confbox
#' @format NULL
#' @usage NULL
#' @export
GeomConfbox <- ggproto(
"GeomConfbox", Geom,
default_aes = aes(confline.col = "grey30", midline.col = "grey50",
colour = NA, fill = "grey60", size = 0.5,
midline.type = "dotted", linetype = 1,
alpha = NA),
required_aes = c("x", "y", "r", "lower.ci", "upper.ci"),
draw_panel = function(self, data, panel_params, coord, width = 0.5) {
aesthetics <- setdiff(
names(data), c("x", "y", "r", "lower.ci", "upper.ci")
)
grobs <- lapply(split(data, seq_len(nrow(data))), function(row) {
d <- point_to_confbox(row$x, row$y, row$r, row$lower.ci, row$upper.ci, width)
confbox <- d$conf_box
confline <- d$conf_line
midline <- d$mid_line
## draw mid line
mid_aes <- cbind(midline, new_data_frame(row[aesthetics]))
mid_aes$colour <- row$midline.col
mid_aes$linetype <- row$midline.type
mid <- GeomSegment$draw_panel(mid_aes, panel_params, coord)
## draw conf box
confbox_aes <- cbind(confbox,
new_data_frame(row[aesthetics])[rep(1, 5), ])
confbox_aes$colour <- NA
box <- GeomPolygon$draw_panel(confbox_aes, panel_params, coord)
## draw conf line
confline_aes <- cbind(confline,
new_data_frame(row[aesthetics])[rep(1, 3), ])
confline_aes$colour <- row$confline.col
line <- GeomSegment$draw_panel(confline_aes, panel_params, coord)
grid::gList(mid, box, line)
})
ggplot2:::ggname("geom_confbox", do.call("grobTree", grobs))
},
draw_key = draw_key_polygon
)
#' @noRd
point_to_confbox <- function(x, y, r, lower.ci, upper.ci, width = 0.5) {
r <- r / 2
lower.ci <- lower.ci / 2
upper.ci <- upper.ci / 2
## confidence box
xmin <- - 0.5 * width + x
xmax <- 0.5 * width + x
ymin <- lower.ci + y
ymax <- upper.ci + y
conf_box <- new_data_frame(list(
y = c(ymax, ymax, ymin, ymin, ymax),
x = c(xmin, xmax, xmax, xmin, xmin)
))
## confidence line
xx <- rep_len(xmin, 3)
xend <- rep_len(xmax, 3)
yy <- c(lower.ci, r, upper.ci) + y
yend <- c(lower.ci, r, upper.ci) + y
conf_line <- new_data_frame(list(
x = xx,
y = yy,
xend = xend,
yend = yend
))
## mid line
mid_line <- new_data_frame(list(
x = x - 0.5,
y = y,
xend = x + 0.5,
yend = y
))
## return confbox, confline, midline list
list(conf_box = conf_box,
conf_line = conf_line,
mid_line = mid_line)
}
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