brand-before-theme.qmd

---
title: "dark brand - ggplot"
brand:
  light: blue-background.yml
  dark: red-background.yml
theme:
  light: simplex
  dark: cyborg # same effect as [brand, cyborg]
execute:
  echo: false
  warning: false
---

```{r}
#| echo: false
#| warning: false
library(ggplot2)

ggplot_theme <- function(bgcolor, fgcolor) {
  theme_minimal(base_size = 11) %+%
    theme(
      panel.border = element_blank(),
      panel.grid.major.y = element_blank(),
      panel.grid.minor.y = element_blank(),
      panel.grid.major.x = element_blank(),
      panel.grid.minor.x = element_blank(),
      text = element_text(colour = fgcolor),
      axis.text = element_text(colour = fgcolor),
      rect = element_rect(colour = bgcolor, fill = bgcolor),
      plot.background = element_rect(fill = bgcolor, colour = NA),
      axis.line = element_line(colour = fgcolor),
      axis.ticks = element_line(colour = fgcolor)
    )
}

brand_ggplot <- function(brand_yml) {
  brand <- yaml::yaml.load_file(brand_yml)
  ggplot_theme(brand$color$background, brand$color$foreground)
}

blue_theme <- brand_ggplot("blue-background.yml")
red_theme <- brand_ggplot("red-background.yml")

colour_scale <- scale_colour_manual(values = c("darkorange", "purple", "cyan4"))
```


```{r}
#| renderings: [light, dark]
ggplot(mtcars, aes(mpg, wt)) +
  geom_point(aes(colour = factor(cyl))) +
  blue_theme +
  colour_scale
ggplot(mtcars, aes(mpg, wt)) +
  geom_point(aes(colour = factor(cyl))) +
  red_theme +
  colour_scale
```