Extra Coordinate Systems, 'Geoms', Statistical Transformations, Scales and Fonts for 'ggplot2'
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#' Step ribbon statistic
#'
#' Provides stairstep values for ribbon plots
#'
#' @inheritParams ggplot2::geom_ribbon
#' @param direction \code{hv} for horizontal-veritcal steps, \code{vh} for
#' vertical-horizontal steps
#' @references \url{https://groups.google.com/forum/?fromgroups=#!topic/ggplot2/9cFWHaH1CPs}
#' @export
#' @examples
#' x <- 1:10
#' df <- data.frame(x=x, y=x+10, ymin=x+7, ymax=x+12)
#'
#' gg <- ggplot(df, aes(x, y))
#' gg <- gg + geom_ribbon(aes(ymin=ymin, ymax=ymax),
#' stat="stepribbon", fill="#b2b2b2")
#' gg <- gg + geom_step(color="#2b2b2b")
#' gg
#'
#' gg <- ggplot(df, aes(x, y))
#' gg <- gg + geom_ribbon(aes(ymin=ymin, ymax=ymax),
#' stat="stepribbon", fill="#b2b2b2",
#' direction="hv")
#' gg <- gg + geom_step(color="#2b2b2b")
#' gg
stat_stepribbon <- function(mapping=NULL, data=NULL, geom="ribbon",
position="identity",
na.rm=FALSE, show.legend=NA, inherit.aes=TRUE,
direction="hv", ...) {
ggplot2::layer(
data = data,
mapping = mapping,
stat = Stepribbon,
geom = geom,
position = position,
show.legend = show.legend,
inherit.aes = inherit.aes,
params = list(
na.rm = na.rm,
direction = direction,
...
)
)
}
#' @rdname ggalt-ggproto
#' @format NULL
#' @usage NULL
#' @references \url{https://groups.google.com/forum/?fromgroups=#!topic/ggplot2/9cFWHaH1CPs}
#' @export
StatStepribbon <-
ggproto(
"StepRibbon", Stat,
required_aes = c("x", "ymin", "ymax"),
compute_group = function(data, scales, direction="hv",
yvars=c("ymin", "ymax"), ...) {
stairstepn(data=data, direction=direction, yvars=yvars)
}
)
stairstepn <- function(data, direction="hv", yvars="y") {
direction <- match.arg(direction, c("hv", "vh"))
data <- as.data.frame(data)[order(data$x),]
n <- nrow(data)
if (direction == "vh") {
xs <- rep(1:n, each=2)[-2*n]
ys <- c(1, rep( 2:n, each=2))
} else {
ys <- rep(1:n, each=2)[-2*n]
xs <- c(1, rep(2:n, each=2))
}
data.frame(
x=data$x[xs],
data[ys, yvars, drop=FALSE],
data[xs, setdiff(names(data), c("x", yvars)), drop=FALSE]
)
}