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#' Flipped cartesian coordinates.
#'
#' Flipped cartesian coordinates so that horizontal becomes vertical, and
#' vertical, horizontal. This is primarily useful for converting geoms and
#' statistics which display y conditional on x, to x conditional on y.
#'
#' @export
#' @inheritParams coord_cartesian
#' @examples
#' h <- ggplot(diamonds, aes(carat)) +
#' geom_histogram()
#' h
#' h + coord_flip()
#' h + coord_flip() + scale_x_reverse()
#'
#' # You can also use it to flip line and area plots:
#' df <- data.frame(x = 1:5, y = (1:5) ^ 2)
#' ggplot(df, aes(x, y)) +
#' geom_area()
#' last_plot() + coord_flip()
coord_flip <- function(xlim = NULL, ylim = NULL, expand = TRUE) {
gganimintproto(NULL, CoordFlip,
limits = list(x = xlim, y = ylim),
expand = expand
)
}
#' @rdname animint2-gganimintproto
#' @format NULL
#' @usage NULL
#' @export
CoordFlip <- gganimintproto("CoordFlip", CoordCartesian,
transform = function(data, scale_details) {
data <- flip_labels(data)
CoordCartesian$transform(data, scale_details)
},
range = function(scale_details) {
list(x = scale_details$y.range, y = scale_details$x.range)
},
train = function(self, scale_details) {
trained <- gganimintproto_parent(CoordCartesian, self)$train(scale_details)
flip_labels(trained)
},
labels = function(scale_details) {
flip_labels(CoordCartesian$labels(scale_details))
}
)
flip_labels <- function(x) {
old_names <- names(x)
new_names <- old_names
new_names <- gsub("^x", "z", new_names)
new_names <- gsub("^y", "x", new_names)
new_names <- gsub("^z", "y", new_names)
setNames(x, new_names)
}
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