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#' Horizontal error bars
#'
#' @section Aesthetics:
#' \Sexpr[results=rd,stage=build]{ggplot2:::rd_aesthetics("geom", "errorbarh")}
#'
#' @seealso \code{\link{geom_errorbar}}: vertical error bars
#' @inheritParams geom_point
#' @export
#' @examples
#' df <- data.frame(
#' trt = factor(c(1, 1, 2, 2)),
#' resp = c(1, 5, 3, 4),
#' group = factor(c(1, 2, 1, 2)),
#' se = c(0.1, 0.3, 0.3, 0.2)
#' )
#'
#' # Define the top and bottom of the errorbars
#'
#' p <- ggplot(df, aes(resp, trt, colour = group))
#' p + geom_point() +
#' geom_errorbarh(aes(xmax = resp + se, xmin = resp - se))
#' p + geom_point() +
#' geom_errorbarh(aes(xmax = resp + se, xmin = resp - se, height = .2))
geom_errorbarh <- function (mapping = NULL, data = NULL, stat = "identity", position = "identity", ...) {
GeomErrorbarh$new(mapping = mapping, data = data, stat = stat, position = position, ...)
}
GeomErrorbarh <- proto(Geom, {
objname <- "errorbarh"
default_stat <- function(.) StatIdentity
default_aes <- function(.) aes(colour = "black", size=0.5, linetype=1, height=0.5, alpha = NA)
guide_geom <- function(.) "path"
required_aes <- c("x", "xmin", "xmax", "y")
reparameterise <- function(., df, params) {
df$height <- df$height %||%
params$height %||% (resolution(df$y, FALSE) * 0.9)
transform(df,
ymin = y - height / 2, ymax = y + height / 2, height = NULL
)
}
draw <- function(., data, scales, coordinates, height = NULL, ...) {
GeomPath$draw(with(data, data.frame(
x = as.vector(rbind(xmax, xmax, NA, xmax, xmin, NA, xmin, xmin)),
y = as.vector(rbind(ymin, ymax, NA, y, y, NA, ymin, ymax)),
colour = rep(colour, each = 8),
alpha = rep(alpha, each = 8),
size = rep(size, each = 8),
linetype = rep(linetype, each = 8),
group = rep(1:(nrow(data)), each = 8),
stringsAsFactors = FALSE,
row.names = 1:(nrow(data) * 8)
)), scales, coordinates, ...)
}
})
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