#' Cross Geom
#'
#' @param sig.level significance threshold.
#' @inheritParams ggplot2::layer
#' @inheritParams ggplot2::geom_segment
#' @section Aesthetics:
#' \code{geom_cross()} understands the following aesthetics (required
#' aesthetics are in bold):
#' \itemize{
#' \item \strong{\code{x}}
#' \item \strong{\code{y}}
#' \item \strong{\code{p.value}}
#' \item \code{alpha}
#' \item \code{colour}
#' \item \code{linetype}
#' \item \code{size}
#' }
#' @importFrom ggplot2 layer ggproto GeomSegment aes draw_key_blank
#' @importFrom grid grobTree
#' @rdname geom_cross
#' @author Houyun Huang, Lei Zhou, Jian Chen, Taiyun Wei
#' @export
geom_cross <- function(mapping = NULL, data = NULL,
stat = "identity", position = "identity",
...,
sig.level = 0.05,
linejoin = "mitre",
na.rm = FALSE,
show.legend = NA,
inherit.aes = TRUE) {
layer(
data = data,
mapping = mapping,
stat = stat,
geom = GeomCross,
position = position,
show.legend = show.legend,
inherit.aes = inherit.aes,
params = list(
sig.level = sig.level,
linejoin = linejoin,
na.rm = na.rm,
...
)
)
}
#' @rdname geom_cross
#' @format NULL
#' @usage NULL
#' @export
GeomCross <- ggproto(
"GeomCross", GeomSegment,
default_aes = aes(colour = "red", size = 0.5, linetype = 1, alpha = NA),
required_aes = c("x", "y", "p.value"),
draw_panel = function(self, data, panel_params, coord, linejoin = "mitre",
sig.level = 0.05, r0 = 0.6) {
aesthetics <- setdiff(names(data), c("x", "y", "p.value"))
data <- with(data, subset(data, p.value >= sig.level))
if(nrow(data) == 0) {
return(ggplot2::zeroGrob())
}
dd <- point_to_cross(data$x, data$y, r0)
aes <- data[rep(1:nrow(data), each = 2) , aesthetics, drop = FALSE]
GeomSegment$draw_panel(cbind(dd, aes), panel_params, coord)
},
draw_key = draw_key_blank
)
#' @noRd
point_to_cross <- function(x, y, r = 0.6) {
xx <- c(x - 0.5 * r, x - 0.5 * r)
xend <- c(x + 0.5 * r, x + 0.5 * r)
yy <- c(y - 0.5 * r, y + 0.5 * r)
yend <- c(y + 0.5 * r, y - 0.5 * r)
new_data_frame(list(
x = xx,
y = yy,
xend = xend,
yend = yend
))
}
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