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#' Benchmark plot creation time.
#' Broken down into construct, build, render and draw times.
#'
#' @param x code to create ggplot2 plot
#' @export
#' @keywords internal
#' @examples
#' benchplot(ggplot(mtcars, aes(mpg, wt)) + geom_point())
#' benchplot(ggplot(mtcars, aes(mpg, wt)) + geom_point() + facet_grid(. ~ cyl))
benchplot <- function(x) {
construct <- system.time(force(x))
stopifnot(inherits(x, "ggplot"))
build <- system.time(data <- ggplot_build(x))
render <- system.time(grob <- ggplot_gtable(data))
draw <- system.time(grid.draw(grob))
times <- rbind(construct, build, render, draw)[, 1:3]
plyr::unrowname(data.frame(
step = c("construct", "build", "render", "draw", "TOTAL"),
rbind(times, colSums(times))))
}