R/themes.R

In ngramr: Retrieve and Plot Google n-Gram Data

#' Google Ngram theme for ggplot2
#'
#' @param ... additional parameters to pass to \code{theme}
#'
#' @details
#' Use a Google Ngram-style plot theme.
#'
#' @export

theme_google <- function(...) {
  theme(panel.border = element_rect(colour = "grey", size = 0.2, fill = NA),
        panel.background = element_rect(fill = NA),
        axis.line = element_line(colour = "black", size = 0.3),
        panel.grid.major = element_line(colour = "grey", size = 0.2),
        panel.grid.minor = element_blank(),
        legend.position = "top",
        legend.direction = "horizontal",
        legend.box = "vertical",
        legend.key = element_rect(fill = NA),
        axis.text = element_text(colour = "black"),
        axis.ticks = element_blank(), ...)
}

scale_colour_google <- function(...) {
  palette <- c("#264EC0", "#D22310", "#FC8608", "#168713", "#850086",
               "#1086B9", "#D22B63", "#559D05", "#A71B23", "#21436F",
               "#852D86", "#219B86")
  scale_colour_manual(..., values = palette)
}

scale_fill_google <- function(...) {
  palette <- c("#264EC0", "#D22310", "#FC8608", "#168713", "#850086",
               "#1086B9", "#D22B63", "#559D05", "#A71B23", "#21436F",
               "#852D86", "#219B86")
  scale_fill_manual(..., values = palette)
}