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ggplot themes, code
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gistfile1.txt
#' Complete themes
#'
#' These are complete themes which control all non-data display. Use
#' [theme()] if you just need to tweak the display of an existing
#' theme.
#'
#' @param base_size base font size
#' @param base_family base font family
#' @param base_line_size base size for line elements
#' @param base_rect_size base size for rect elements
#'
#' @details
#' \describe{
#'
#' \item{`theme_gray`}{
#' The signature ggplot2 theme with a grey background and white gridlines,
#' designed to put the data forward yet make comparisons easy.}
#'
#' \item{`theme_bw`}{
#' The classic dark-on-light ggplot2 theme. May work better for presentations
#' displayed with a projector.}
#'
#' \item{`theme_linedraw`}{
#' A theme with only black lines of various widths on white backgrounds,
#' reminiscent of a line drawings. Serves a purpose similar to `theme_bw`.
#' Note that this theme has some very thin lines (<< 1 pt) which some journals
#' may refuse.}
#'
#' \item{`theme_light`}{
#' A theme similar to `theme_linedraw` but with light grey lines and axes,
#' to direct more attention towards the data.}
#'
#' \item{`theme_dark`}{
#' The dark cousin of `theme_light`, with similar line sizes but a dark background. Useful to make thin coloured lines pop out.}
#'
#' \item{`theme_minimal`}{
#' A minimalistic theme with no background annotations.}
#'
#' \item{`theme_classic`}{
#' A classic-looking theme, with x and y axis lines and no gridlines.}
#'
#' \item{`theme_void`}{
#' A completely empty theme.}
#'
#' \item{`theme_test`}{
#' A theme for visual unit tests. It should ideally never change except
#' for new features.}
#'
#' }
#'
#' @examples
#' mtcars2 <- within(mtcars, {
#' vs <- factor(vs, labels = c("V-shaped", "Straight"))
#' am <- factor(am, labels = c("Automatic", "Manual"))
#' cyl <- factor(cyl)
#' gear <- factor(gear)
#' })
#'
#' p1 <- ggplot(mtcars2) +
#' geom_point(aes(x = wt, y = mpg, colour = gear)) +
#' labs(title = "Fuel economy declines as weight increases",
#' subtitle = "(1973-74)",
#' caption = "Data from the 1974 Motor Trend US magazine.",
#' tag = "Figure 1",
#' x = "Weight (1000 lbs)",
#' y = "Fuel economy (mpg)",
#' colour = "Gears")
#'
#' p1 + theme_gray() # the default
#' p1 + theme_bw()
#' p1 + theme_linedraw()
#' p1 + theme_light()
#' p1 + theme_dark()
#' p1 + theme_minimal()
#' p1 + theme_classic()
#' p1 + theme_void()
#'
#' # Theme examples with panels
#' \donttest{
#' p2 <- p1 + facet_grid(vs ~ am)
#'
#' p2 + theme_gray() # the default
#' p2 + theme_bw()
#' p2 + theme_linedraw()
#' p2 + theme_light()
#' p2 + theme_dark()
#' p2 + theme_minimal()
#' p2 + theme_classic()
#' p2 + theme_void()
#' }
#' @name ggtheme
#' @aliases NULL
NULL
#' @include theme.r
#' @export
#' @rdname ggtheme
theme_grey <- function(base_size = 11, base_family = "",
base_line_size = base_size / 22,
base_rect_size = base_size / 22) {
# The half-line (base-fontsize / 2) sets up the basic vertical
# rhythm of the theme. Most margins will be set to this value.
# However, when we work with relative sizes, we may want to multiply
# `half_line` with the appropriate relative size. This applies in
# particular for axis tick sizes. And also, for axis ticks and
# axis titles, `half_size` is too large a distance, and we use `half_size/2`
# instead.
half_line <- base_size / 2
# Throughout the theme, we use three font sizes, `base_size` (`rel(1)`)
# for normal, `rel(0.8)` for small, and `rel(1.2)` for large.
theme(
# Elements in this first block aren't used directly, but are inherited
# by others
line = element_line(
colour = "black", size = base_line_size,
linetype = 1, lineend = "butt"
),
rect = element_rect(
fill = "white", colour = "black",
size = base_rect_size, linetype = 1
),
text = element_text(
family = base_family, face = "plain",
colour = "black", size = base_size,
lineheight = 0.9, hjust = 0.5, vjust = 0.5, angle = 0,
margin = margin(), debug = FALSE
),
axis.line = element_blank(),
axis.line.x = NULL,
axis.line.y = NULL,
axis.text = element_text(size = rel(0.8), colour = "grey30"),
axis.text.x = element_text(margin = margin(t = 0.8 * half_line / 2), vjust = 1),
axis.text.x.top = element_text(margin = margin(b = 0.8 * half_line / 2), vjust = 0),
axis.text.y = element_text(margin = margin(r = 0.8 * half_line / 2), hjust = 1),
axis.text.y.right = element_text(margin = margin(l = 0.8 * half_line / 2), hjust = 0),
axis.ticks = element_line(colour = "grey20"),
axis.ticks.length = unit(half_line / 2, "pt"),
axis.title.x = element_text(
margin = margin(t = half_line / 2),
vjust = 1
),
axis.title.x.top = element_text(
margin = margin(b = half_line / 2),
vjust = 0
),
axis.title.y = element_text(
angle = 90,
margin = margin(r = half_line / 2),
vjust = 1
),
axis.title.y.right = element_text(
angle = -90,
margin = margin(l = half_line / 2),
vjust = 0
),
legend.background = element_rect(colour = NA),
legend.spacing = unit(2 * half_line, "pt"),
legend.spacing.x = NULL,
legend.spacing.y = NULL,
legend.margin = margin(half_line, half_line, half_line, half_line),
legend.key = element_rect(fill = "grey95", colour = "white"),
legend.key.size = unit(1.2, "lines"),
legend.key.height = NULL,
legend.key.width = NULL,
legend.text = element_text(size = rel(0.8)),
legend.text.align = NULL,
legend.title = element_text(hjust = 0),
legend.title.align = NULL,
legend.position = "right",
legend.direction = NULL,
legend.justification = "center",
legend.box = NULL,
legend.box.margin = margin(0, 0, 0, 0, "cm"),
legend.box.background = element_blank(),
legend.box.spacing = unit(2 * half_line, "pt"),
panel.background = element_rect(fill = "grey92", colour = NA),
panel.border = element_blank(),
panel.grid = element_line(colour = "white"),
panel.grid.minor = element_line(size = rel(0.5)),
panel.spacing = unit(half_line, "pt"),
panel.spacing.x = NULL,
panel.spacing.y = NULL,
panel.ontop = FALSE,
strip.background = element_rect(fill = "grey85", colour = NA),
strip.text = element_text(
colour = "grey10",
size = rel(0.8),
margin = margin(0.8 * half_line, 0.8 * half_line, 0.8 * half_line, 0.8 * half_line)
),
strip.text.x = NULL,
strip.text.y = element_text(angle = -90),
strip.placement = "inside",
strip.placement.x = NULL,
strip.placement.y = NULL,
strip.switch.pad.grid = unit(half_line / 2, "pt"),
strip.switch.pad.wrap = unit(half_line / 2, "pt"),
plot.background = element_rect(colour = "white"),
plot.title = element_text( # font size "large"
size = rel(1.2),
hjust = 0, vjust = 1,
margin = margin(b = half_line)
),
plot.subtitle = element_text( # font size "regular"
hjust = 0, vjust = 1,
margin = margin(b = half_line)
),
plot.caption = element_text( # font size "small"
size = rel(0.8),
hjust = 1, vjust = 1,
margin = margin(t = half_line)
),
plot.tag = element_text(
size = rel(1.2),
hjust = 0.5, vjust = 0.5
),
plot.tag.position = 'topleft',
plot.margin = margin(half_line, half_line, half_line, half_line),
complete = TRUE
)
}
#' @export
#' @rdname ggtheme
theme_gray <- theme_grey
#' @export
#' @rdname ggtheme
theme_bw <- function(base_size = 11, base_family = "",
base_line_size = base_size / 22,
base_rect_size = base_size / 22) {
# Starts with theme_grey and then modify some parts
theme_grey(
base_size = base_size,
base_family = base_family,
base_line_size = base_line_size,
base_rect_size = base_rect_size
) %+replace%
theme(
# white background and dark border
panel.background = element_rect(fill = "white", colour = NA),
panel.border = element_rect(fill = NA, colour = "grey20"),
# make gridlines dark, same contrast with white as in theme_grey
panel.grid = element_line(colour = "grey92"),
panel.grid.minor = element_line(size = rel(0.5)),
# contour strips to match panel contour
strip.background = element_rect(fill = "grey85", colour = "grey20"),
# match legend key to background
legend.key = element_rect(fill = "white", colour = NA),
complete = TRUE
)
}
#' @export
#' @rdname ggtheme
theme_linedraw <- function(base_size = 11, base_family = "",
base_line_size = base_size / 22,
base_rect_size = base_size / 22) {
half_line <- base_size / 2
# Starts with theme_bw and then modify some parts
# = replace all greys with pure black or white
theme_bw(
base_size = base_size,
base_family = base_family,
base_line_size = base_line_size,
base_rect_size = base_rect_size
) %+replace%
theme(
# black text and ticks on the axes
axis.text = element_text(colour = "black", size = rel(0.8)),
axis.ticks = element_line(colour = "black", size = rel(0.5)),
# NB: match the *visual* thickness of axis ticks to the panel border
# 0.5 clipped looks like 0.25
# pure black panel border and grid lines, but thinner
panel.border = element_rect(fill = NA, colour = "black", size = rel(1)),
panel.grid = element_line(colour = "black"),
panel.grid.major = element_line(size = rel(0.1)),
panel.grid.minor = element_line(size = rel(0.05)),
# strips with black background and white text
strip.background = element_rect(fill = "black"),
strip.text = element_text(
colour = "white",
size = rel(0.8),
margin = margin(0.8 * half_line, 0.8 * half_line, 0.8 * half_line, 0.8 * half_line)
),
complete = TRUE
)
}
#' @export
#' @rdname ggtheme
theme_light <- function(base_size = 11, base_family = "",
base_line_size = base_size / 22,
base_rect_size = base_size / 22) {
half_line <- base_size / 2
# Starts with theme_grey and then modify some parts
theme_grey(
base_size = base_size,
base_family = base_family,
base_line_size = base_line_size,
base_rect_size = base_rect_size
) %+replace%
theme(
# white panel with light grey border
panel.background = element_rect(fill = "white", colour = NA),
panel.border = element_rect(fill = NA, colour = "grey70", size = rel(1)),
# light grey, thinner gridlines
# => make them slightly darker to keep acceptable contrast
panel.grid = element_line(colour = "grey87"),
panel.grid.major = element_line(size = rel(0.5)),
panel.grid.minor = element_line(size = rel(0.25)),
# match axes ticks thickness to gridlines and colour to panel border
axis.ticks = element_line(colour = "grey70", size = rel(0.5)),
# match legend key to panel.background
legend.key = element_rect(fill = "white", colour = NA),
# dark strips with light text (inverse contrast compared to theme_grey)
strip.background = element_rect(fill = "grey70", colour = NA),
strip.text = element_text(
colour = "white",
size = rel(0.8),
margin = margin(0.8 * half_line, 0.8 * half_line, 0.8 * half_line, 0.8 * half_line)
),
complete = TRUE
)
}
#' @export
#' @rdname ggtheme
theme_dark <- function(base_size = 11, base_family = "",
base_line_size = base_size / 22,
base_rect_size = base_size / 22) {
half_line <- base_size / 2
# Starts with theme_grey and then modify some parts
theme_grey(
base_size = base_size,
base_family = base_family,
base_line_size = base_line_size,
base_rect_size = base_rect_size
) %+replace%
theme(
# dark panel
panel.background = element_rect(fill = "grey50", colour = NA),
# inverse grid lines contrast compared to theme_grey
# make them thinner and try to keep the same visual contrast as in theme_light
panel.grid = element_line(colour = "grey42"),
panel.grid.major = element_line(size = rel(0.5)),
panel.grid.minor = element_line(size = rel(0.25)),
# match axes ticks thickness to gridlines
axis.ticks = element_line(colour = "grey20", size = rel(0.5)),
# match legend key to panel.background
legend.key = element_rect(fill = "grey50", colour = NA),
# dark strips with light text (inverse contrast compared to theme_grey)
strip.background = element_rect(fill = "grey15", colour = NA),
strip.text = element_text(
colour = "grey90",
size = rel(0.8),
margin = margin(0.8 * half_line, 0.8 * half_line, 0.8 * half_line, 0.8 * half_line)
),
complete = TRUE
)
}
#' @export
#' @rdname ggtheme
theme_minimal <- function(base_size = 11, base_family = "",
base_line_size = base_size / 22,
base_rect_size = base_size / 22) {
# Starts with theme_bw and remove most parts
theme_bw(
base_size = base_size,
base_family = base_family,
base_line_size = base_line_size,
base_rect_size = base_rect_size
) %+replace%
theme(
axis.ticks = element_blank(),
legend.background = element_blank(),
legend.key = element_blank(),
panel.background = element_blank(),
panel.border = element_blank(),
strip.background = element_blank(),
plot.background = element_blank(),
complete = TRUE
)
}
#' @export
#' @rdname ggtheme
theme_classic <- function(base_size = 11, base_family = "",
base_line_size = base_size / 22,
base_rect_size = base_size / 22) {
theme_bw(
base_size = base_size,
base_family = base_family,
base_line_size = base_line_size,
base_rect_size = base_rect_size
) %+replace%
theme(
# no background and no grid
panel.border = element_blank(),
panel.grid.major = element_blank(),
panel.grid.minor = element_blank(),
# show axes
axis.line = element_line(colour = "black", size = rel(1)),
# match legend key to panel.background
legend.key = element_blank(),
# simple, black and white strips
strip.background = element_rect(fill = "white", colour = "black", size = rel(2)),
# NB: size is 1 but clipped, it looks like the 0.5 of the axes
complete = TRUE
)
}
#' @export
#' @rdname ggtheme
theme_void <- function(base_size = 11, base_family = "",
base_line_size = base_size / 22,
base_rect_size = base_size / 22) {
half_line <- base_size / 2
# Only keep indispensable text: legend and plot titles
theme(
line = element_blank(),
rect = element_blank(),
text = element_text(
family = base_family, face = "plain",
colour = "black", size = base_size,
lineheight = 0.9, hjust = 0.5, vjust = 0.5, angle = 0,
margin = margin(), debug = FALSE
),
axis.text = element_blank(),
axis.title = element_blank(),
axis.ticks.length = unit(0, "pt"),
legend.box = NULL,
legend.key.size = unit(1.2, "lines"),
legend.position = "right",
legend.text = element_text(size = rel(0.8)),
legend.title = element_text(hjust = 0),
strip.text = element_text(size = rel(0.8)),
strip.switch.pad.grid = unit(half_line / 2, "pt"),
strip.switch.pad.wrap = unit(half_line / 2, "pt"),
panel.ontop = FALSE,
panel.spacing = unit(half_line, "pt"),
plot.margin = unit(c(0, 0, 0, 0), "lines"),
plot.title = element_text(
size = rel(1.2),
hjust = 0, vjust = 1,
margin = margin(t = half_line)
),
plot.subtitle = element_text(
hjust = 0, vjust = 1,
margin = margin(t = half_line)
),
plot.caption = element_text(
size = rel(0.8),
hjust = 1, vjust = 1,
margin = margin(t = half_line)
),
plot.tag = element_text(
size = rel(1.2),
hjust = 0.5, vjust = 0.5
),
plot.tag.position = 'topleft',
complete = TRUE
)
}
#' @export
#' @rdname ggtheme
theme_test <- function(base_size = 11, base_family = "",
base_line_size = base_size / 22,
base_rect_size = base_size / 22) {
half_line <- base_size / 2
theme(
line = element_line(
colour = "black", size = base_line_size,
linetype = 1, lineend = "butt"
),
rect = element_rect(
fill = "white", colour = "black",
size = base_rect_size, linetype = 1
),
text = element_text(
family = base_family, face = "plain",
colour = "black", size = base_size,
lineheight = 0.9, hjust = 0.5, vjust = 0.5, angle = 0,
margin = margin(), debug = FALSE
),
axis.line = element_blank(),
axis.line.x = NULL,
axis.line.y = NULL,
axis.text = element_text(size = rel(0.8), colour = "grey30"),
axis.text.x = element_text(margin = margin(t = 0.8 * half_line / 2), vjust = 1),
axis.text.x.top = element_text(margin = margin(b = 0.8 * half_line / 2), vjust = 0),
axis.text.y = element_text(margin = margin(r = 0.8 * half_line / 2), hjust = 1),
axis.text.y.right = element_text(margin = margin(l = 0.8 * half_line / 2), hjust = 0),
axis.ticks = element_line(colour = "grey20"),
axis.ticks.length = unit(half_line / 2, "pt"),
axis.title.x = element_text(
margin = margin(t = half_line / 2),
vjust = 1
),
axis.title.x.top = element_text(
margin = margin(b = half_line / 2),
vjust = 0
),
axis.title.y = element_text(
angle = 90,
margin = margin(r = half_line / 2),
vjust = 1
),
axis.title.y.right = element_text(
angle = -90,
margin = margin(l = half_line / 2),
vjust = 0
),
legend.background = element_rect(colour = NA),
legend.spacing = unit(2 * half_line, "pt"),
legend.spacing.x = NULL,
legend.spacing.y = NULL,
legend.margin = margin(0, 0, 0, 0, "cm"),
legend.key = element_rect(fill = "white", colour=NA),
legend.key.size = unit(1.2, "lines"),
legend.key.height = NULL,
legend.key.width = NULL,
legend.text = element_text(size = rel(0.8)),
legend.text.align = NULL,
legend.title = element_text(hjust = 0),
legend.title.align = NULL,
legend.position = "right",
legend.direction = NULL,
legend.justification = "center",
legend.box = NULL,
legend.box.margin = margin(0, 0, 0, 0, "cm"),
legend.box.background = element_blank(),
legend.box.spacing = unit(2 * half_line, "pt"),
panel.background = element_rect(fill = "white", colour = NA),
panel.border = element_rect(fill = NA, colour = "grey20"),
panel.grid.major = element_blank(),
panel.grid.minor = element_blank(),
panel.spacing = unit(half_line, "pt"),
panel.spacing.x = NULL,
panel.spacing.y = NULL,
panel.ontop = FALSE,
strip.background = element_rect(fill = "grey85", colour = "grey20"),
strip.text = element_text(
colour = "grey10",
size = rel(0.8),
margin = margin(0.8 * half_line, 0.8 * half_line, 0.8 * half_line, 0.8 * half_line)
),
strip.text.x = NULL,
strip.text.y = element_text(angle = -90),
strip.placement = "inside",
strip.placement.x = NULL,
strip.placement.y = NULL,
strip.switch.pad.grid = unit(half_line / 2, "pt"),
strip.switch.pad.wrap = unit(half_line / 2, "pt"),
plot.background = element_rect(colour = "white"),
plot.title = element_text(
size = rel(1.2),
hjust = 0, vjust = 1,
margin = margin(b = half_line)
),
plot.subtitle = element_text(
hjust = 0, vjust = 1,
margin = margin(b = half_line)
),
plot.caption = element_text(
size = rel(0.8),
hjust = 1, vjust = 1,
margin = margin(t = half_line)
),
plot.tag = element_text(
size = rel(1.2),
hjust = 0.5, vjust = 0.5
),
plot.tag.position = 'topleft',
plot.margin = margin(half_line, half_line, half_line, half_line),
complete = TRUE
)
}
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