Add ggplot2 themes matching slide styles

DESCRIPTION

 URL: https://github.com/gadenbuie/xaringanthemer
 BugReports: https://github.com/gadenbuie/xaringanthemer/issues
 Imports: 
+    colorspace,
     glue,
     purrr,
     stringr,
     utils,
     whisker
 Suggests: 
+    ggplot2,
     here,
     knitr,
     rmarkdown,
+    showtext,
+    sysfonts,
     testthat,
     xaringan
 VignetteBuilder: 

NAMESPACE

 export(duo)
 export(duo_accent)
 export(duo_accent_inverse)
+export(get_xaringanthemer_value)
 export(google_font)
 export(google_language_codes)
 export(lighten_color)
 export(mono_light)
 export(solarized_dark)
 export(solarized_light)
+export(theme_xaringan)
+export(theme_xaringan_base)
+export(theme_xaringan_inverse)
+export(theme_xaringan_set_defaults)
 export(write_extra_css)
 export(write_xaringan_theme)
+export(xaringan_theme_restore_defaults)
 importFrom(grDevices,col2rgb)
 importFrom(grDevices,hsv)
 importFrom(grDevices,rgb)

R/ggplot2.R

+
+#' A Plot Theme for ggplot2 by xaringanthemer
+#'
+#' Creates [ggplot2] themes to match the xaringanthemer theme used in the
+#' [xaringan] slides that seamlessly matches the "normal" slide colors and
+#' styles.
+#'
+#' @param text_color Color for text and foreground, inherits from `text_color`
+#' @param background_color Color for background, inherits from
+#'   `background_color`
+#' @param accent_color Color for titles and accents, inherits from
+#'   `header_color`
+#' @param accent_secondary_color Color for secondary accents, inherits from
+#'   `text_bold_color`
+#' @inheritDotParams theme_xaringan_base
+#'
+#' @examples
+#' if (requireNamespace("ggplot2", quietly = TRUE)) {
+#'   # Set xaringanthemer theme but save to tempfile
+#'   duo_accent(outfile = tempfile())
+#'
+#'   library(ggplot2)
+#'   ggplot(iris) +
+#'     aes(Petal.Length, Petal.Width) +
+#'     geom_point() +
+#'     theme_xaringan()
+#' }
+#'
+#' @family xaringanthemer ggplot2 themes
+#' @export
+theme_xaringan <- function(
+  text_color = NULL,
+  background_color = NULL,
+  accent_color = NULL,
+  accent_secondary_color = NULL,
+  ...
+) {
+  requires_xaringanthemer_env()
+  requires_package(fn = "xaringan_theme")
+
+  background_color <- background_color %||% xaringanthemer_env$background_color
+  text_color <- text_color %||% xaringanthemer_env$text_color
+  accent_color <- accent_color %||% xaringanthemer_env$header_color
+  accent_secondary_color <- accent_secondary_color %||% xaringanthemer_env$text_bold_color %||% accent_color
+
+  theme_xaringan_base(text_color, background_color,
+                      accent_color = accent_color,
+                      accent_secondary_color = accent_secondary_color,
+                      ...)
+}
+
+#' An Inverse Plot Theme for ggplot2 by xaringanthemer
+#'
+#' A [ggplot2] xaringanthemer plot theme to seamlessly match the "inverse"
+#' [xaringan] slide colors and styles as styled by [xaringanthemer].
+#'
+#' @param text_color Color for text and foreground, inherits from `text_color`
+#' @param background_color Color for background, inherits from
+#'   `background_color`
+#' @param accent_color Color for titles and accents, inherits from
+#'   `header_color`
+#' @param accent_secondary_color Color for secondary accents, inherits from
+#'   `text_bold_color`
+#' @inheritDotParams theme_xaringan_base
+#'
+#' @examples
+#' if (requireNamespace("ggplot2", quietly = TRUE)) {
+#'   # Set xaringanthemer theme but save to tempfile
+#'   duo_accent(outfile = tempfile())
+#'
+#'   library(ggplot2)
+#'   ggplot(iris) +
+#'     aes(Petal.Length, Petal.Width) +
+#'     geom_point() +
+#'     theme_xaringan()
+#' }
+#'
+#' @family xaringanthemer ggplot2 themes
+#' @export
+theme_xaringan_inverse <- function(
+  text_color = NULL,
+  background_color = NULL,
+  accent_color = NULL,
+  accent_secondary_color = NULL,
+  ...
+) {
+  requires_xaringanthemer_env()
+  requires_package(fn = "xaringan_theme")
+
+  background_color <- background_color %||% xaringanthemer_env$inverse_background_color
+  text_color <- text_color %||% xaringanthemer_env$inverse_text_color
+  accent_color <- accent_color %||% xaringanthemer_env$inverse_header_color
+  accent_secondary_color <- accent_secondary_color %||% accent_color
+
+  theme_xaringan_base(text_color, background_color,
+                      accent_color = accent_color,
+                      accent_secondary_color = accent_secondary_color,
+                      ...)
+}
+
+#' The ggplot2 xaringanthemer base plot theme
+#'
+#' Provides a base plot theme for [ggplot2] to match the [xaringan] slide theme
+#' created by [xaringanthemer]. The theme is designed to create a general plot
+#' style from two colors, a `background_color` and a `text_color` (or foreground
+#' color). Also accepts an `accent_color` and an `accent_secondary_color` that are
+#' [xaringanthemer] is not required for the base theme. Use
+#' [theme_xaringan()] or [theme_xaringan_inverse()] in xaringan slides styled by
+#' xaringanthemer for a plot theme that matches the slide style.
+#'
+#' @param text_color Color for text and foreground
+#' @param background_color Color for background
+#' @param accent_color Color for titles and accents, inherits from
+#'   `header_color` or `text_color`. Used for the `title` base setting in
+#'   [ggplot2::theme()], and additionally for setting the `color` or `fill` of
+#'   [ggplot2] geom defaults.
+#' @param accent_secondary_color Color for secondary accents, inherits from
+#'   `text_bold_color` or `accent_color`. Used only when setting [ggplot2] geom
+#'   defaults.
+#' @param set_ggplot_defaults Should defaults be set for [ggplot2] _geoms_?
+#'   Defaults to TRUE. To restore ggplot's defaults, or the previously set geom
+#'   defaults, see [theme_xaringan_restore_defaults()].
+#' @param text_font Font to use for text elements, passed to
+#'   [sysfonts::font_add_google()], if available and `text_font_use_google` is
+#'   `TRUE`. Inherits from `text_font_family`.
+#' @param text_font_use_google Is `text_font` available on [Google
+#'   Fonts](https://fonts.google.com)?
+#' @param text_font_size Base text font size, inherits from `text_font_size`, or
+#'   defaults to 11.
+#' @param title_font Font to use for title elements, passed to
+#'   [sysfonts::font_add_google()], if available and `title_font_use_google` is
+#'   `TRUE`. Inherits from `title_font_family`.
+#' @param title_font_use_google Is `title_font` available on [Google
+#'   Fonts](https://fonts.google.com)?
+#' @param title_font_size Base text font size, inherits from `title_font_size`,
+#'   or defaults to 14.
+#' @param ... Ignored
+#'
+#' @examples
+#' if (requireNamespace("ggplot2", quietly = TRUE)) {
+#'   library(ggplot2)
+#'   ggplot(iris) +
+#'     aes(Petal.Length, Petal.Width) +
+#'     geom_point() +
+#'     theme_xaringan_base(
+#'       text_color = "#e1e5f2",
+#'       background_color = "#021c25",
+#'       accent_color = "#1f7a8c",
+#'       set_ggplot_defaults = TRUE) +
+#'       labs(title = "Basic Iris Plot",
+#'            subtitle = "+ theme_xaringan_base()",
+#'            caption = "{xaringanthemer}")
+#'
+#'    ggplot(iris) +
+#'     aes(Petal.Length, Petal.Width) +
+#'     geom_point() +
+#'     theme_xaringan_base(
+#'       text_color = "#021c25",
+#'       background_color = "#e1e5f2",
+#'       accent_color = "#1f7a8c",
+#'       set_ggplot_defaults = TRUE) +
+#'       labs(title = "Basic Iris Plot",
+#'            subtitle = "+ theme_xaringan_base()",
+#'            caption = "{xaringanthemer}")
+#' }
+#'
+#' @family xaringanthemer ggplot2 themes
+#' @export
+theme_xaringan_base <- function(
+  text_color,
+  background_color,
+  ...,
+  set_ggplot_defaults = TRUE,
+  accent_color = NULL,
+  accent_secondary_color = NULL,
+  text_font = NULL,
+  text_font_use_google = NULL,
+  text_font_size = NULL,
+  title_font = NULL,
+  title_font_use_google = NULL,
+  title_font_size = NULL
+) {
+  blend <- color_blender(text_color, background_color)
+
+  text_font_size <- text_font_size %||% web_to_point(xaringanthemer_env$text_font_size, scale = 1.25) %||% 11
+  title_font_size <- title_font_size %||% web_to_point(xaringanthemer_env$header_h3_font_size, scale = 0.8) %||% 14
+
+  text_font <- if (!is.null(text_font)) {
+    register_font(text_font, identical(text_font_use_google, TRUE))
+  } else get_theme_font("text")
+  title_font <- if (!is.null(title_font)) {
+    register_font(title_font, identical(title_font_use_google, TRUE))
+  } else get_theme_font("header")
+
+  text_font %||% "sans"
+  title_font %||% "sans"
+
+  if (set_ggplot_defaults) {
+    accent_color <- accent_color %||% xaringanthemer_env$header_color %||% text_color
+    accent_secondary_color <- accent_secondary_color %||% xaringanthemer_env$text_bold_color %||% accent_color
+    theme_xaringan_set_defaults(text_color, background_color, accent_color, accent_secondary_color)
+  }
+
+  ggplot2::theme(
+    line = ggplot2::element_line(color = blend(0.2)),
+    rect = ggplot2::element_rect(fill = background_color),
+    text = ggplot2::element_text(
+      color  = blend(0.1),
+      family = text_font,
+      size   = text_font_size),
+    title = ggplot2::element_text(
+      color  = accent_color,
+      family = title_font,
+      size   = title_font_size),
+    plot.background  = ggplot2::element_rect(
+      fill  = background_color,
+      color = background_color),
+    panel.background = ggplot2::element_rect(
+      fill  = background_color,
+      color = background_color),
+    panel.grid.major = ggplot2::element_line(
+      color = blend(0.8),
+      inherit.blank = TRUE),
+    panel.grid.minor = ggplot2::element_line(
+      color = blend(0.9),
+      inherit.blank = TRUE),
+    axis.title = ggplot2::element_text(size = title_font_size * 0.8),
+    axis.ticks = ggplot2::element_line(color = blend(0.8)),
+    axis.text  = ggplot2::element_text(color = blend(0.4)),
+    plot.caption = ggplot2::element_text(
+      size  = text_font_size * 0.8,
+      color = blend(0.3))
+  )
+}
+
+#' Set and Restore ggplot2 geom Defaults
+#'
+#' Set [ggplot2] _geom_ defaults to match [theme_xaringan()] with
+#' `theme_xaringan_set_defaults()` and restore the standard or previously-set
+#' defaults with `theme_xaringan_restore_defaults()`. By default,
+#' `theme_xaringan_set_defaults()` is run with [theme_xaringan()] or
+#' [theme_xaringan_inverse()].
+#'
+#' @family xaringanthemer ggplot2 themes
+#' @inheritParams theme_xaringan
+#' @export
+theme_xaringan_set_defaults <- function(
+  text_color = NULL,
+  background_color = NULL,
+  accent_color = text_color,
+  accent_secondary_color = accent_color,
+  text_family = NULL
+) {
+  requires_package("ggplot2")
+
+  blend <- color_blender(text_color, background_color)
+
+  xaringan_theme_defaults <- list(
+    "line"       = list(color  = text_color),
+    "vline"      = list(color  = accent_secondary_color),
+    "hline"      = list(color  = accent_secondary_color),
+    "abline"     = list(color  = accent_secondary_color),
+    "segment"    = list(color  = text_color),
+    "bar"        = list(fill   = accent_color),
+    "col"        = list(fill   = accent_color),
+    "boxplot"    = list(color  = text_color),
+    "contour"    = list(color  = text_color),
+    "density"    = list(color  = text_color,
+                        fill   = text_color,
+                        alpha  = 0.1),
+    "dotplot"    = list(color  = accent_color),
+    "errorbarh"  = list(color  = text_color),
+    "crossbar"   = list(color  = text_color),
+    "errorbar"   = list(color  = text_color),
+    "linerange"  = list(color  = text_color),
+    "pointrange" = list(color  = text_color),
+    "map"        = list(color  = text_color),
+    "path"       = list(color  = text_color),
+    "line"       = list(color  = text_color),
+    "step"       = list(color  = text_color),
+    "point"      = list(color  = accent_color),
+    "polygon"    = list(color  = accent_color,
+                        fill   = accent_color),
+    "quantile"   = list(color  = text_color),
+    "rug"        = list(color  = blend(0.5)),
+    "segment"    = list(color  = text_color),
+    "smooth"     = list(fill   = blend(0.75),
+                        color  = accent_secondary_color),
+    "spoke"      = list(color  = text_color),
+    "label"      = list(color  = text_color,
+                        family = text_family %||% get_theme_font("text")),
+    "text"       = list(color  = text_color,
+                        family = text_family %||% get_theme_font("text")),
+    "rect"       = list(fill   = text_color),
+    "tile"       = list(fill   = text_color),
+    "violin"     = list(fill   = text_color),
+    "sf"         = list(color  = text_color)
+  )
+
+  geom_names <- setNames(nm = names(xaringan_theme_defaults))
+
+  previous_defaults <- lapply(
+    geom_names,
+    function(geom) safely_set_geom(geom, xaringan_theme_defaults[[geom]])
+  )
+
+  if (is.null(xaringanthemer_env$old_ggplot_defaults)) {
+    xaringanthemer_env$old_ggplot_defaults <- previous_defaults
+  }
+
+  invisible(previous_defaults)
+}
+
+#' @describeIn theme_xaringan_set_defaults Restore previous or standard [ggplot2] _geom_ defaults.
+#' @inheritParams theme_xaringan
+#' @export
+xaringan_theme_restore_defaults <- function() {
+  requires_package("ggplot2")
+  requires_xaringanthemer_env()
+
+  if (is.null(xaringanthemer_env$old_ggplot_defaults)) return(invisible())
+
+
+  old_default <- xaringanthemer_env$old_ggplot_defaults
+  old_default_not_std <- vapply(old_default, function(x) length(x) > 0, logical(1))
+  old_default <- old_default[old_default_not_std]
+
+  restore_default <- utils::modifyList(xaringanthemer_env$std_ggplot_defaults, old_default)
+
+  geom_names <- setNames(nm = names(restore_default))
+  previous_defaults <- lapply(
+    geom_names,
+    function(geom) safely_set_geom(geom, restore_default[[geom]])
+  )
+
+  invisible(previous_defaults)
+}
+
+safely_set_geom <- function(geom, new) {
+  tryCatch({
+    ggplot2::update_geom_defaults(geom, new)
+  },
+  error = function(e) invisible(),
+  warning = function(w) invisible())
+}
+
+blend_colors <- function(x, y, alpha = 0.5) {
+  x <- colorspace::hex2RGB(x)
+  y <- colorspace::hex2RGB(y)
+  z <- colorspace::mixcolor(alpha, x, y)
+  colorspace::hex(z)
+}
+
+color_blender <- function(x, y) function(alpha = 0.5) blend_colors(x, y, alpha)
+
+get_theme_font <- function(element = c("text", "header", "code")) {
+  element <- match.arg(element)
+
+  element_family <- paste0(element, "_font_family")
+  element_google <- paste0(element, "_font_google")
+  element_url    <- paste0(element, "_font_url")
+
+  family <- xaringanthemer_env[[element_family]]
+  is_google_font <- !is.null(xaringanthemer_env[[element_google]]) ||
+    grepl("fonts.google", xaringanthemer_env[[element_url]], fixed = TRUE)
+
+  register_font(family, google = is_google_font, fn = sys.calls()[[max(1, length(sys.calls()) - 1)]])
+}
+
+register_font <- function(
+  family,
+  google = TRUE,
+  fn = sys.calls()[[max(1, length(sys.calls()) - 1)]][[1]],
+  ...
+) {
+  if (is.null(family)) return(NULL)
+  family <- gsub("['\"]", "", family)
+
+  if (!identical(xaringanthemer_env$showtext_auto, TRUE)) {
+    if (requires_package(pkg = "showtext", fn, required = FALSE)) {
+      showtext::showtext_auto()
+    } else return(family)
+    xaringanthemer_env$showtext_auto <- TRUE
+  }
+
+  if (!requires_package(pkg = "sysfonts", fn, required = FALSE)) {
+    return(family)
+  } else if (!family %in% sysfonts::font_families()) {
+    is_default_font <- family %in% c(
+      "Roboto", "Source Code Pro", "Yanone Kaffeesatz"
+    )
+    if (identical(google, TRUE) || is_default_font) {
+      sysfonts::font_add_google(family, ...)
+    } else {
+      warning(paste(
+        "Please manually register fonts not served by Google Fonts.",
+        "See `sysfonts::font_add()` for more information."))
+    }
+  }
+  family
+}
+
+requires_package <- function(pkg = "ggplot2", fn = "", required = TRUE) {
+  raise <- if (required) stop else warning
+  if (!requireNamespace(pkg, quietly = TRUE)) {
+    msg <- paste0(
+      "`", pkg, "` is ",
+      if (required) "required " else "suggested ",
+      if (fn != "") paste0("by ", fn, "() ")[1],
+      "but is not installed."
+    )
+    raise(msg, call. = FALSE)
+    invisible(FALSE)
+  }
+  invisible(TRUE)
+}
+
+requires_xaringanthemer_env <- function() {
+  if (!exists("xaringanthemer_env") || is.null(xaringanthemer_env$header_color)) {
+    stop("Please call a xaringanthemer theme function first.")
+  }
+}
+
+#' Get the Value of xaringanthemer Style Setting
+#'
+#' A helper function to retrieve the value of style settings as set by a
+#' xaringanthemer style function, for use in plotting and other circumstances.
+#'
+#' @param setting A xaringanthemer style setting
+#' @export
+get_xaringanthemer_value <- function(
+  setting = c(
+    "header_background_content_padding_top", "table_row_border_color",
+    "text_bold_color", "code_highlight_color", "footnote_color",
+    "text_slide_number_color", "table_row_even_background_color",
+    "title_slide_text_color", "background_color", "extra_fonts",
+    "header_background_ignore_classes", "header_font_weight", "title_slide_background_image",
+    "background_size", "header_h2_font_size", "code_inline_font_size",
+    "text_font_google", "header_h1_font_size", "header_background_padding",
+    "header_font_family", "code_font_url", "text_font_url", "footnote_position_bottom",
+    "title_slide_background_position", "code_inline_color", "link_color",
+    "left_column_selected_color", "header_background_text_color",
+    "inverse_text_color", "text_color", "code_inline_background_color",
+    "extra_css", "outfile", "footnote_font_size", "header_h3_font_size",
+    "text_font_base", "code_font_google", "code_font_size", "title_slide_background_size",
+    "text_font_size", "padding", "text_font_family", "code_font_family",
+    "text_font_family_fallback", "blockquote_left_border_color",
+    "left_column_subtle_color", "table_border_color", "inverse_background_color",
+    "header_color", "inverse_header_color", "title_slide_background_color",
+    "header_background_color", "text_font_weight",
+    "background_image", "header_font_google", "text_slide_number_font_size",
+    "inverse_text_shadow", "code_font_family_fallback", "header_font_url",
+    "background_position", "header_background_auto")
+) {
+  requires_xaringanthemer_env()
+  setting <- match.arg(setting)
+  xaringanthemer_env[[setting]]
+}
+
+web_to_point <- function(x, px_per_em = 16, scale = 1) {
+  if (is.null(x)) return(NULL)
+  if (grepl("pt$", x)) {
+    return(as.numeric(sub("pt$", "", x)))
+  } else if (grepl("px$", x)) {
+    x <- as.numeric(sub("px$", "", x))
+    return(x * 0.75)
+  } else if (grepl("em$", x)) {
+    x <- as.numeric(sub("em$", "", x))
+    return(x * px_per_em * 0.75)
+  } else {
+    return()
+  }
+}

R/write_theme.R

 #' @param header_h1_font_size h1 Header Text Font Size. Defaults to 55px. Modifies the `.remark-slide-content h1` class.
 #' @param header_h2_font_size h2 Header Text Font Size. Defaults to 45px. Modifies the `.remark-slide-content h2` class.
 #' @param header_h3_font_size h3 Header Text Font Size. Defaults to 35px. Modifies the `.remark-slide-content h3` class.
-#' @param header_background_auto Add background under slide title automatically for h1 header elements. If not enabled, use `class: header_background` to enable.. Defaults to `FALSE`. 
+#' @param header_background_auto Add background under slide title automatically for h1 header elements. If not enabled, use `class: header_background` to enable.. Defaults to `FALSE`.
 #' @param header_background_color Background Color for h1 Header with Background. Defaults to `header_color`. Modifies the `.remark-slide-content h1` class.
 #' @param header_background_text_color Text Color for h1 Header with Background. Defaults to `background_color`. Modifies the `.remark-slide-content h1` class.
 #' @param header_background_padding Padding for h1 Header with Background. Defaults to 2rem 4rem 1.5rem 4rem. Modifies the `.remark-slide-content h1` class.
       var, "<-quote_elements_w_spaces(", var, ")"
     )))
   }
-  
+
   # Use font_..._google args to overwrite font args
   for (var in f_args[grepl("font_google$", f_args)]) {
     gf <- eval(parse(text = var))
       }
     }
   }
-  
+
   extra_font_imports <- if (is.null(extra_fonts)) "" else list2fonts(extra_fonts)
-  
+
   # convert NA arguments to NULL
   for (var in f_args) {
     val <- eval(parse(text = var))
     is_na <- length(val) == 0
     if (is_na) assign(var, NULL)
   }
-  
+
   # prepare variables for template
   body_font_family <- paste(c(text_font_family, text_font_family_fallback, text_font_base), collapse = ', ')
   background_size_fallback <- if (is.null(background_position)) "cover" else "100%"
     title_slide_background_image %??% "cover"
   )
   table_row_even_background_color <- table_row_even_background_color %||% background_color
-  
+
+  lapply(names(formals()), function(n) assign(n, get(n), envir = xaringanthemer_env))
+
   xaringanthemer_version <- utils::packageVersion("xaringanthemer")
-  
+
   # prepare header background object
   needs_leading_dot <- !grepl("^\\.", header_background_ignore_classes)
   header_background_ignore_classes[needs_leading_dot] <- paste0(
     content_padding_top = header_background_content_padding_top,
     ignore = header_background_ignore_classes
   )
-  
+
   tf <- system.file("resources", "template.css", package = "xaringanthemer")
   template <- readLines(tf, warn = FALSE)
   template <- paste(template, collapse = "\n")

R/xaringanthemer-package.R

 #' @importFrom grDevices col2rgb rgb rgb2hsv hsv
 #' @keywords internal
 "_PACKAGE"
+
+xaringanthemer_env <- new.env(parent = emptyenv())
+
+xaringanthemer_env$std_ggplot_defaults <- list(
+  "line"       = list(color  = "black"),
+  "vline"      = list(color  = "black"),
+  "hline"      = list(color  = "black"),
+  "abline"     = list(color  = "black"),
+  "segment"    = list(color  = "black"),
+  "bar"        = list(fill   = "grey35"),
+  "col"        = list(fill   = "grey35"),
+  "boxplot"    = list(color  = "grey20", fill = "white"),
+  "contour"    = list(color  = "#3366FF"),
+  "density"    = list(color  = "black",
+                      fill   = NA,
+                      alpha  = NA),
+  "dotplot"    = list(color  = "black"),
+  "errorbarh"  = list(color  = "black"),
+  "crossbar"   = list(color  = "black"),
+  "errorbar"   = list(color  = "black"),
+  "linerange"  = list(color  = "black"),
+  "pointrange" = list(color  = "black"),
+  "map"        = list(color  = "black"),
+  "path"       = list(color  = "black"),
+  "line"       = list(color  = "black"),
+  "step"       = list(color  = "black"),
+  "point"      = list(color  = "black"),
+  "polygon"    = list(color  = NA,
+                      fill   = "grey20"),
+  "quantile"   = list(color  = "#3366FF"),
+  "rug"        = list(color  = "black"),
+  "segment"    = list(color  = "black"),
+  "smooth"     = list(fill   = "grey60",
+                      color  = "#3366FF"),
+  "spoke"      = list(color  = "black"),
+  "label"      = list(color  = "black",
+                      family = ""),
+  "text"       = list(color  = "black",
+                      family = ""),
+  "rect"       = list(fill   = "grey35"),
+  "tile"       = list(fill   = "grey20"),
+  "violin"     = list(fill   = "white", color = "grey20")
+)

inst/scripts/write_xaringan_theme_body.R

 )
 table_row_even_background_color <- table_row_even_background_color %||% background_color
 
+lapply(names(formals()), function(n) assign(n, get(n), envir = test_env))
+
 xaringanthemer_version <- utils::packageVersion("xaringanthemer")
 
 # prepare header background object

man/get_xaringanthemer_value.Rd

+% Generated by roxygen2: do not edit by hand
+% Please edit documentation in R/ggplot2.R
+\name{get_xaringanthemer_value}
+\alias{get_xaringanthemer_value}
+\title{Get the Value of xaringanthemer Style Setting}
+\usage{
+
+  get_xaringanthemer_value(setting = c("header_background_content_padding_top",
+  "table_row_border_color", "text_bold_color", "code_highlight_color",
+  "footnote_color", "text_slide_number_color",
+  "table_row_even_background_color", "title_slide_text_color",
+  "background_color", "extra_fonts", "header_background_ignore_classes",
+  "header_font_weight", "title_slide_background_image", "background_size",
+  "header_h2_font_size", "code_inline_font_size", "text_font_google",
+  "header_h1_font_size", "header_background_padding", "header_font_family",
+       "code_font_url", "text_font_url", "footnote_position_bottom",
+  "title_slide_background_position", "code_inline_color", "link_color",
+  "left_column_selected_color", "header_background_text_color",
+  "inverse_text_color", "text_color", "code_inline_background_color",
+  "extra_css", "outfile", "footnote_font_size", "header_h3_font_size",
+  "text_font_base", "code_font_google", "code_font_size",
+  "title_slide_background_size", "text_font_size", "padding",
+  "text_font_family", "code_font_family", "text_font_family_fallback",     
+  "blockquote_left_border_color", "left_column_subtle_color",
+  "table_border_color", "inverse_background_color", "header_color",
+  "inverse_header_color", "title_slide_background_color",
+  "header_background_color", "text_font_weight", "background_image",
+  "header_font_google", "text_slide_number_font_size",
+  "inverse_text_shadow", "code_font_family_fallback", "header_font_url",
+  "background_position", "header_background_auto"))
+}
+\arguments{
+\item{setting}{A xaringanthemer style setting}
+}
+\description{
+A helper function to retrieve the value of style settings as set by a
+xaringanthemer style function, for use in plotting and other circumstances.
+}

man/theme_xaringan.Rd

+% Generated by roxygen2: do not edit by hand
+% Please edit documentation in R/ggplot2.R
+\name{theme_xaringan}
+\alias{theme_xaringan}
+\title{A Plot Theme for ggplot2 by xaringanthemer}
+\usage{
+theme_xaringan(text_color = NULL, background_color = NULL,
+  accent_color = NULL, accent_secondary_color = NULL, ...)
+}
+\arguments{
+\item{text_color}{Color for text and foreground, inherits from \code{text_color}}
+
+\item{background_color}{Color for background, inherits from
+\code{background_color}}
+
+\item{accent_color}{Color for titles and accents, inherits from
+\code{header_color}}
+
+\item{accent_secondary_color}{Color for secondary accents, inherits from
+\code{text_bold_color}}
+
+\item{...}{Arguments passed on to \code{theme_xaringan_base}
+\describe{
+  \item{text_color}{Color for text and foreground}
+  \item{background_color}{Color for background}
+  \item{accent_color}{Color for titles and accents, inherits from
+\code{header_color} or \code{text_color}. Used for the \code{title} base setting in
+\code{\link[ggplot2:theme]{ggplot2::theme()}}, and additionally for setting the \code{color} or \code{fill} of
+\link{ggplot2} geom defaults.}
+  \item{accent_secondary_color}{Color for secondary accents, inherits from
+\code{text_bold_color} or \code{accent_color}. Used only when setting \link{ggplot2} geom
+defaults.}
+  \item{set_ggplot_defaults}{Should defaults be set for \link{ggplot2} \emph{geoms}?
+Defaults to TRUE. To restore ggplot's defaults, or the previously set geom
+defaults, see \code{\link[=theme_xaringan_restore_defaults]{theme_xaringan_restore_defaults()}}.}
+  \item{text_font}{Font to use for text elements, passed to
+\code{\link[sysfonts:font_add_google]{sysfonts::font_add_google()}}, if available and \code{text_font_use_google} is
+\code{TRUE}. Inherits from \code{text_font_family}.}
+  \item{text_font_use_google}{Is \code{text_font} available on \href{https://fonts.google.com}{Google Fonts}?}
+  \item{text_font_size}{Base text font size, inherits from \code{text_font_size}, or
+defaults to 11.}
+  \item{title_font}{Font to use for title elements, passed to
+\code{\link[sysfonts:font_add_google]{sysfonts::font_add_google()}}, if available and \code{title_font_use_google} is
+\code{TRUE}. Inherits from \code{title_font_family}.}
+  \item{title_font_use_google}{Is \code{title_font} available on \href{https://fonts.google.com}{Google Fonts}?}
+  \item{title_font_size}{Base text font size, inherits from \code{title_font_size},
+or defaults to 14.}
+}}
+}
+\description{
+Creates \link{ggplot2} themes to match the xaringanthemer theme used in the
+\link{xaringan} slides that seamlessly matches the "normal" slide colors and
+styles.
+}
+\examples{
+if (requireNamespace("ggplot2", quietly = TRUE)) {
+  # Set xaringanthemer theme but save to tempfile
+  duo_accent(outfile = tempfile())
+
+  library(ggplot2)
+  ggplot(iris) +
+    aes(Petal.Length, Petal.Width) +
+    geom_point() +
+    theme_xaringan()
+}
+
+}
+\seealso{
+Other xaringanthemer ggplot2 themes: \code{\link{theme_xaringan_base}},
+  \code{\link{theme_xaringan_inverse}},
+  \code{\link{theme_xaringan_set_defaults}}
+}
+\concept{xaringanthemer ggplot2 themes}

man/theme_xaringan_base.Rd

+% Generated by roxygen2: do not edit by hand
+% Please edit documentation in R/ggplot2.R
+\name{theme_xaringan_base}
+\alias{theme_xaringan_base}
+\title{The ggplot2 xaringanthemer base plot theme}
+\usage{
+theme_xaringan_base(text_color, background_color, ...,
+  set_ggplot_defaults = TRUE, accent_color = NULL,
+  accent_secondary_color = NULL, text_font = NULL,
+  text_font_use_google = NULL, text_font_size = NULL,
+  title_font = NULL, title_font_use_google = NULL,
+  title_font_size = NULL)
+}
+\arguments{
+\item{text_color}{Color for text and foreground}
+
+\item{background_color}{Color for background}
+
+\item{...}{Ignored}
+
+\item{set_ggplot_defaults}{Should defaults be set for \link{ggplot2} \emph{geoms}?
+Defaults to TRUE. To restore ggplot's defaults, or the previously set geom
+defaults, see \code{\link[=theme_xaringan_restore_defaults]{theme_xaringan_restore_defaults()}}.}
+
+\item{accent_color}{Color for titles and accents, inherits from
+\code{header_color} or \code{text_color}. Used for the \code{title} base setting in
+\code{\link[ggplot2:theme]{ggplot2::theme()}}, and additionally for setting the \code{color} or \code{fill} of
+\link{ggplot2} geom defaults.}
+
+\item{accent_secondary_color}{Color for secondary accents, inherits from
+\code{text_bold_color} or \code{accent_color}. Used only when setting \link{ggplot2} geom
+defaults.}
+
+\item{text_font}{Font to use for text elements, passed to
+\code{\link[sysfonts:font_add_google]{sysfonts::font_add_google()}}, if available and \code{text_font_use_google} is
+\code{TRUE}. Inherits from \code{text_font_family}.}
+
+\item{text_font_use_google}{Is \code{text_font} available on \href{https://fonts.google.com}{Google Fonts}?}
+
+\item{text_font_size}{Base text font size, inherits from \code{text_font_size}, or
+defaults to 11.}
+
+\item{title_font}{Font to use for title elements, passed to
+\code{\link[sysfonts:font_add_google]{sysfonts::font_add_google()}}, if available and \code{title_font_use_google} is
+\code{TRUE}. Inherits from \code{title_font_family}.}
+
+\item{title_font_use_google}{Is \code{title_font} available on \href{https://fonts.google.com}{Google Fonts}?}
+
+\item{title_font_size}{Base text font size, inherits from \code{title_font_size},
+or defaults to 14.}
+}
+\description{
+Provides a base plot theme for \link{ggplot2} to match the \link{xaringan} slide theme
+created by \link{xaringanthemer}. The theme is designed to create a general plot
+style from two colors, a \code{background_color} and a \code{text_color} (or foreground
+color). Also accepts an \code{accent_color} and an \code{accent_secondary_color} that are
+\link{xaringanthemer} is not required for the base theme. Use
+\code{\link[=theme_xaringan]{theme_xaringan()}} or \code{\link[=theme_xaringan_inverse]{theme_xaringan_inverse()}} in xaringan slides styled by
+xaringanthemer for a plot theme that matches the slide style.
+}
+\examples{
+if (requireNamespace("ggplot2", quietly = TRUE)) {
+  library(ggplot2)
+  ggplot(iris) +
+    aes(Petal.Length, Petal.Width) +
+    geom_point() +
+    theme_xaringan_base(
+      text_color = "#e1e5f2",
+      background_color = "#021c25",
+      accent_color = "#1f7a8c",
+      set_ggplot_defaults = TRUE) +
+      labs(title = "Basic Iris Plot",
+           subtitle = "+ theme_xaringan_base()",
+           caption = "{xaringanthemer}")
+
+   ggplot(iris) +
+    aes(Petal.Length, Petal.Width) +
+    geom_point() +
+    theme_xaringan_base(
+      text_color = "#021c25",
+      background_color = "#e1e5f2",
+      accent_color = "#1f7a8c",
+      set_ggplot_defaults = TRUE) +
+      labs(title = "Basic Iris Plot",
+           subtitle = "+ theme_xaringan_base()",
+           caption = "{xaringanthemer}")
+}
+
+}
+\seealso{
+Other xaringanthemer ggplot2 themes: \code{\link{theme_xaringan_inverse}},
+  \code{\link{theme_xaringan_set_defaults}},
+  \code{\link{theme_xaringan}}
+}
+\concept{xaringanthemer ggplot2 themes}

man/theme_xaringan_inverse.Rd

+% Generated by roxygen2: do not edit by hand
+% Please edit documentation in R/ggplot2.R
+\name{theme_xaringan_inverse}
+\alias{theme_xaringan_inverse}
+\title{An Inverse Plot Theme for ggplot2 by xaringanthemer}
+\usage{
+theme_xaringan_inverse(text_color = NULL, background_color = NULL,
+  accent_color = NULL, accent_secondary_color = NULL, ...)
+}
+\arguments{
+\item{text_color}{Color for text and foreground, inherits from \code{text_color}}
+
+\item{background_color}{Color for background, inherits from
+\code{background_color}}
+
+\item{accent_color}{Color for titles and accents, inherits from
+\code{header_color}}
+
+\item{accent_secondary_color}{Color for secondary accents, inherits from
+\code{text_bold_color}}
+
+\item{...}{Arguments passed on to \code{theme_xaringan_base}
+\describe{
+  \item{text_color}{Color for text and foreground}
+  \item{background_color}{Color for background}
+  \item{accent_color}{Color for titles and accents, inherits from
+\code{header_color} or \code{text_color}. Used for the \code{title} base setting in
+\code{\link[ggplot2:theme]{ggplot2::theme()}}, and additionally for setting the \code{color} or \code{fill} of
+\link{ggplot2} geom defaults.}
+  \item{accent_secondary_color}{Color for secondary accents, inherits from
+\code{text_bold_color} or \code{accent_color}. Used only when setting \link{ggplot2} geom
+defaults.}
+  \item{set_ggplot_defaults}{Should defaults be set for \link{ggplot2} \emph{geoms}?
+Defaults to TRUE. To restore ggplot's defaults, or the previously set geom
+defaults, see \code{\link[=theme_xaringan_restore_defaults]{theme_xaringan_restore_defaults()}}.}
+  \item{text_font}{Font to use for text elements, passed to
+\code{\link[sysfonts:font_add_google]{sysfonts::font_add_google()}}, if available and \code{text_font_use_google} is
+\code{TRUE}. Inherits from \code{text_font_family}.}
+  \item{text_font_use_google}{Is \code{text_font} available on \href{https://fonts.google.com}{Google Fonts}?}
+  \item{text_font_size}{Base text font size, inherits from \code{text_font_size}, or
+defaults to 11.}
+  \item{title_font}{Font to use for title elements, passed to
+\code{\link[sysfonts:font_add_google]{sysfonts::font_add_google()}}, if available and \code{title_font_use_google} is
+\code{TRUE}. Inherits from \code{title_font_family}.}
+  \item{title_font_use_google}{Is \code{title_font} available on \href{https://fonts.google.com}{Google Fonts}?}
+  \item{title_font_size}{Base text font size, inherits from \code{title_font_size},
+or defaults to 14.}
+}}
+}
+\description{
+A \link{ggplot2} xaringanthemer plot theme to seamlessly match the "inverse"
+\link{xaringan} slide colors and styles as styled by \link{xaringanthemer}.
+}
+\examples{
+if (requireNamespace("ggplot2", quietly = TRUE)) {
+  # Set xaringanthemer theme but save to tempfile
+  duo_accent(outfile = tempfile())
+
+  library(ggplot2)
+  ggplot(iris) +
+    aes(Petal.Length, Petal.Width) +
+    geom_point() +
+    theme_xaringan()
+}
+
+}
+\seealso{
+Other xaringanthemer ggplot2 themes: \code{\link{theme_xaringan_base}},
+  \code{\link{theme_xaringan_set_defaults}},
+  \code{\link{theme_xaringan}}
+}
+\concept{xaringanthemer ggplot2 themes}

man/theme_xaringan_set_defaults.Rd

+% Generated by roxygen2: do not edit by hand
+% Please edit documentation in R/ggplot2.R
+\name{theme_xaringan_set_defaults}
+\alias{theme_xaringan_set_defaults}
+\alias{xaringan_theme_restore_defaults}
+\title{Set and Restore ggplot2 geom Defaults}
+\usage{
+theme_xaringan_set_defaults(text_color = NULL, background_color = NULL,
+  accent_color = text_color, accent_secondary_color = accent_color,
+  text_family = NULL)
+
+xaringan_theme_restore_defaults()
+}
+\arguments{
+\item{text_color}{Color for text and foreground, inherits from \code{text_color}}
+
+\item{background_color}{Color for background, inherits from
+\code{background_color}}
+
+\item{accent_color}{Color for titles and accents, inherits from
+\code{header_color}}
+
+\item{accent_secondary_color}{Color for secondary accents, inherits from
+\code{text_bold_color}}
+}
+\description{
+Set \link{ggplot2} \emph{geom} defaults to match \code{\link[=theme_xaringan]{theme_xaringan()}} with
+\code{theme_xaringan_set_defaults()} and restore the standard or previously-set
+defaults with \code{theme_xaringan_restore_defaults()}. By default,
+\code{theme_xaringan_set_defaults()} is run with \code{\link[=theme_xaringan]{theme_xaringan()}} or
+\code{\link[=theme_xaringan_inverse]{theme_xaringan_inverse()}}.
+}
+\section{Functions}{
+\itemize{
+\item \code{xaringan_theme_restore_defaults}: Restore previous or standard \link{ggplot2} \emph{geom} defaults.
+}}
+
+\seealso{
+Other xaringanthemer ggplot2 themes: \code{\link{theme_xaringan_base}},
+  \code{\link{theme_xaringan_inverse}},
+  \code{\link{theme_xaringan}}
+}
+\concept{xaringanthemer ggplot2 themes}