R/scale_label_size.R

In YTLogos/ggraph: An Implementation of Grammar of Graphics for Graphs and Networks

#' Edge label size scales
#'
#' This set of scales defines new size scales for edge labels in order to allow
#' for separate sizing of edges and their labels.
#'
#' @return A ggproto object inheriting from \code{Scale}
#'
#' @family scale_edge_*
#'
#' @name scale_label_size
#' @rdname scale_label_size
#'
NULL

#' @rdname scale_label_size
#'
#' @inheritParams ggplot2::scale_size_continuous
#'
#' @importFrom scales area_pal
#' @export
scale_label_size_continuous <- function(..., range = c(1, 6)) {
    continuous_scale("label_size", "area", area_pal(range), ...)
}
#' @rdname scale_label_size
#'
#' @export
scale_label_size <- scale_label_size_continuous
#' @rdname scale_label_size
#'
#' @inheritParams ggplot2::scale_size_discrete
#'
#' @importFrom scales rescale_pal
#' @export
scale_label_size_discrete <- function(..., range = c(2, 6)) {
    discrete_scale("label_size", "size_d", function(n) {
        area <- seq(range[1] ^ 2, range[2] ^ 2, length.out = n)
        sqrt(area)
    }, ...)
}
#' @rdname scale_label_size
#'
#' @inheritParams ggplot2::scale_size_manual
#'
#' @export
scale_label_size_manual <- function(..., values) {
    manual_scale("label_size", values, ...)
}
#' @rdname scale_label_size
#'
#' @inheritParams ggplot2::scale_size_identity
#'
#' @importFrom scales identity_pal
#' @export
scale_label_size_identity <- function(..., guide = "none") {
    sc <- discrete_scale("label_size", "identity", identity_pal(), ...,
                         guide = guide, super = ScaleDiscreteIdentity)
    sc
}