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#' Add a completely blank area
#'
#' This simple wrapper creates an empty transparent patch that can be added to
#' push your other plots apart. The patch responds to adding
#' [theme()][ggplot2::theme] specifications, but only `plot.background` will
#' have an effect.
#'
#' @return A `ggplot` object containing an empty plot
#'
#' @export
#'
#' @examples
#' library(ggplot2)
#'
#' p1 <- ggplot(mtcars) + geom_point(aes(mpg, disp))
#' p2 <- ggplot(mtcars) + geom_boxplot(aes(gear, disp, group = gear))
#'
#' p1 + plot_spacer() + p2
#'
#'
#' # To have more control over spacing, you can use the `plot.margin`
#' # parameter for `theme()` on each individual plot.
#'
#' (p1 + theme(plot.margin = unit(c(0,30,0,0), "pt"))) +
#' (p2 + theme(plot.margin = unit(c(0,0,0,30), "pt")))
#'
plot_spacer <- function() {
table <- make_patch()
class(table) <- c('spacer', class(table))
table
}
is_spacer <- function(x) inherits(x, 'spacer')
#' @export
has_tag.spacer <- function(x) FALSE
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