#' Theme in compliance with the style guide of Elsevier journals
#'
#' This theme is based on
#' http://cdn.elsevier.com/assets/pdf_file/0010/109963/Artwork.pdf
#'
#' @param base_size base font size
#' @param base_family base font type
#' @export
#' @importFrom ggplot2 theme element_line element_rect element_text
#' element_blank rel
#' @importFrom grid unit
#' @family theme
#' @examples
#' library(ggplot2)
#' p <- ggplot(mtcars, aes(x = mpg, y = drat)) + geom_point()
#' p.elsevier <- p + theme_elsevier()
theme_elsevier <- function(base_size = 7, base_family = "") {
half_line <- base_size / 2
plot_bg <- "white"
attr(plot_bg, "inbotheme") <- "elsevier"
theme(
line = element_line(
colour = "black", linewidth = 0.5, linetype = 1, lineend = "butt"
),
rect = element_rect(
fill = "white", colour = "black", linewidth = 0.5, linetype = 1
),
text = element_text(
family = base_family, face = "plain", colour = "black", size = base_size,
hjust = 0.5, vjust = 0.5, angle = 0, lineheight = 0.9, margin = margin(),
debug = FALSE
),
axis.line = element_line(),
axis.line.x = element_line(),
axis.line.y = element_line(),
axis.text = element_text(size = rel(0.8), colour = "black"),
axis.text.x = element_text(
margin = margin(t = 0.8 * half_line / 2),
vjust = 1
),
axis.text.y = element_text(
margin = margin(r = 0.8 * half_line / 2),
hjust = 1
),
axis.ticks = element_line(colour = "black"),
axis.ticks.length = unit(0.15, "cm"),
axis.title.x = element_text(
margin = margin(t = 0.8 * half_line, b = 0.8 * half_line / 2),
colour = "black"
),
axis.title.y = element_text(
margin = margin(r = 0.8 * half_line, l = 0.8 * half_line / 2),
angle = 90,
colour = "black"
),
legend.background = element_rect(colour = NA),
legend.box = NULL,
legend.direction = NULL,
legend.justification = "center",
legend.key = element_rect(colour = "grey80"),
legend.key.size = unit(1.2, "lines"),
legend.key.height = NULL,
legend.key.width = NULL,
legend.margin = margin(half_line, half_line, half_line, half_line),
legend.position = "right",
legend.text = element_text(size = rel(0.8)),
legend.text.align = NULL,
legend.title = element_text(
size = rel(0.8), face = "bold", hjust = 0, colour = "black"
),
legend.title.align = NULL,
panel.background = element_rect(fill = "white", colour = NA),
panel.border = element_rect(fill = NA, colour = "grey50"),
panel.grid = element_line(colour = "grey90", linewidth = 0.2),
panel.grid.minor = element_line(colour = "grey98", linewidth = 0.5),
panel.spacing = unit(half_line, "pt"),
panel.spacing.x = NULL,
panel.spacing.y = NULL,
panel.ontop = FALSE,
plot.background = element_rect(colour = "white", fill = plot_bg),
plot.margin = margin(half_line, half_line, half_line, half_line),
plot.title = element_text(size = rel(1.2)),
plot.subtitle = element_text(
hjust = 0, vjust = 1, margin = margin(b = half_line)
),
plot.tag = element_text(size = rel(1.2), hjust = 0.5, vjust = 0.5),
plot.tag.position = "topleft",
plot.caption = element_text(
size = rel(0.8), hjust = 1, vjust = 1, margin = margin(t = half_line)
),
strip.background = element_rect(fill = "grey80", colour = "grey50"),
strip.text = element_text(size = rel(0.8), colour = "black"),
strip.text.x = element_text(
margin = margin(t = half_line, b = half_line),
colour = "black"
),
strip.text.y = element_text(
margin = margin(l = half_line, r = half_line), angle = -90,
colour = "black"
),
strip.switch.pad.grid = unit(0.1, "cm"),
strip.switch.pad.wrap = unit(0.1, "cm"),
complete = TRUE
)
}
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