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#' @include stat-.r
NULL
#' @export
#' @rdname geom_abline
geom_hline <- function(mapping = NULL, data = NULL,
...,
yintercept,
na.rm = FALSE,
show.legend = NA) {
# Act like an annotation
if (!missing(yintercept)) {
data <- data.frame(yintercept = yintercept)
mapping <- aes(yintercept = yintercept)
show.legend <- FALSE
}
layer(
data = data,
mapping = mapping,
stat = StatIdentity,
geom = GeomHline,
position = PositionIdentity,
show.legend = show.legend,
inherit.aes = FALSE,
params = list(
na.rm = na.rm,
...
)
)
}
#' @rdname ggplot2-ggproto
#' @format NULL
#' @usage NULL
#' @export
GeomHline <- ggproto("GeomHline", Geom,
draw_panel = function(data, panel_params, coord) {
ranges <- coord$range(panel_params)
data$x <- ranges$x[1]
data$xend <- ranges$x[2]
data$y <- data$yintercept
data$yend <- data$yintercept
GeomSegment$draw_panel(unique(data), panel_params, coord)
},
default_aes = aes(colour = "black", size = 0.5, linetype = 1, alpha = NA),
required_aes = "yintercept",
draw_key = draw_key_path
)