R/utilities-grid.R

In ggplot2: Create Elegant Data Visualisations Using the Grammar of Graphics

#' @export
grid::unit

#' @export
grid::arrow

# Name ggplot grid object
# Convenience function to name grid objects
#
# @keyword internal
ggname <- function(prefix, grob) {
  grob$name <- grobName(grob, prefix)
  grob
}

width_cm <- function(x) {
  if (is.grob(x)) {
    convertWidth(grobWidth(x), "cm", TRUE)
  } else if (is.unit(x)) {
    convertWidth(x, "cm", TRUE)
  } else if (is.list(x)) {
    vapply(x, width_cm, numeric(1))
  } else {
    cli::cli_abort("Don't know how to get width of {.cls {class(x)}} object")
  }
}
height_cm <- function(x) {
  if (is.grob(x)) {
    convertHeight(grobHeight(x), "cm", TRUE)
  } else if (is.unit(x)) {
    convertHeight(x, "cm", TRUE)
  } else if (is.list(x)) {
    vapply(x, height_cm, numeric(1))
  } else {
    cli::cli_abort("Don't know how to get height of {.cls {class(x)}} object")
  }
}