#' @rdname position-vertical
#' @export
position_dodgev <- function(height = NULL, preserve = c("total", "single")) {
ggproto(NULL, PositionDodgev,
height = height,
preserve = match.arg(preserve)
)
}
#' @rdname ggstance-ggproto
#' @format NULL
#' @usage NULL
#' @export
PositionDodgev <- ggproto("PositionDodgev", Position,
height = NULL,
preserve = "total",
setup_params = function(self, data) {
if (is.null(data$ymin) && is.null(data$ymax) && is.null(self$height)) {
warning("Height not defined. Set with `position_dodge(height = ?)`",
call. = FALSE)
}
if (identical(self$preserve, "total")) {
n <- NULL
} else {
panels <- unname(split(data, data$PANEL))
ns <- vapply(panels, function(panel) max(table(panel$ymin)), double(1))
n <- max(ns)
}
list(
height = self$height,
n = n
)
},
setup_data = function(self, data, params) {
if (!"y" %in% names(data) && all(c("ymin", "ymax") %in% names(data))) {
data$y <- (data$ymin + data$ymax) / 2
}
data
},
compute_panel = function(data, params, scales) {
collidev(
data,
params$height,
name = "position_dodgev",
strategy = pos_dodgev,
n = params$n,
check.height = FALSE
)
}
)
# Dodge overlapping interval.
# Assumes that each set has the same horizontal position.
pos_dodgev <- function(df, height, n = NULL) {
if (is.null(n)) {
n <- length(unique(df$group))
}
if (n == 1)
return(df)
if (!all(c("ymin", "ymax") %in% names(df))) {
df$ymin <- df$y
df$ymax <- df$y
}
d_height <- max(df$ymax - df$ymin)
# Have a new group index from 1 to number of groups.
# This might be needed if the group numbers in this set don't include all of 1:n
groupidy <- match(df$group, sort(unique(df$group)))
# Find the center for each group, then use that to calculate ymin and ymax
df$y <- df$y + height * ((groupidy - 0.5) / n - .5)
df$ymin <- df$y - d_height / n / 2
df$ymax <- df$y + d_height / n / 2
df
}
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