params <-
list(family = "red", preset = "study", base_size = 13L, content_width = 80L, 
    style = "minimal")

## ----setup, include=FALSE-----------------------------------------------------
knitr::opts_chunk$set(
  collapse = TRUE, comment = "#>", fig.align = "center", fig.retina = 2,
  out.width = "100%", fig.width = 7, fig.asp = 0.618, message = FALSE, warning = FALSE
)
library(ggplot2)
if (requireNamespace("ggplot2", quietly = TRUE) && requireNamespace("albersdown", quietly = TRUE)) {
  ggplot2::theme_set(albersdown::theme_albers(
    family = params$family,
    preset = params$preset,
    base_size = params$base_size
  ))
}

## ----albers-family, echo=FALSE, results='asis'--------------------------------
cat(sprintf('<script>document.addEventListener("DOMContentLoaded",function(){document.body.classList.add("palette-%s");});</script>', params$family))

## ----albers-preset, echo=FALSE, results='asis'--------------------------------
cat(sprintf('<script>document.addEventListener("DOMContentLoaded",function(){document.body.classList.add("preset-%s");});</script>', params$preset))

## ----albers-style, echo=FALSE, results='asis'---------------------------------
cat(sprintf('<script>document.addEventListener("DOMContentLoaded",function(){document.body.classList.remove("style-minimal","style-assertive");if("%s"!=="balanced") document.body.classList.add("style-%s");});</script>', params$style, params$style))
cat(sprintf('<style>:root{--content:%sch}</style>', params$content_width))

## ----palette-check------------------------------------------------------------
pal <- albersdown::albers_palette(params$family)
stopifnot(
  identical(names(pal), c("A900", "A700", "A500", "A300")),
  all(nzchar(unname(pal)))
)
knitr::kable(data.frame(tone = names(pal), hex = unname(pal)), format = "html")

## ----example-plot-------------------------------------------------------------
mtcars$grp <- factor(mtcars$cyl)
stopifnot(length(levels(mtcars$grp)) >= 3)

ggplot(mtcars, aes(wt, mpg, colour = grp)) +
  geom_point(size = 2.2) +
  labs(
    title = "Theme Lab preview",
    subtitle = "Tune family + preset + style, then copy YAML"
  )