EPL Expected Goal Difference Plot (up to Nov. 10, 2019 // Matchday 12)

EPL_xGD_plot.r

# Packages
pacman::p_load(tidyverse, understatr,
               glue, extrafont, magick)
loadfonts(quiet = TRUE)

## add_logo function from Thomas Mock
add_logo <- function(plot_path, logo_path, logo_position, logo_scale = 10){

    # Requires magick R Package https://github.com/ropensci/magick

    # Useful error message for logo position
    if (!logo_position %in% c("top right", "top left", "bottom right", "bottom left")) {
        stop("Error Message: Uh oh! Logo Position not recognized\n  Try: logo_positon = 'top left', 'top right', 'bottom left', or 'bottom right'")
    }

    # read in raw images
    plot <- magick::image_read(plot_path)
    logo_raw <- magick::image_read(logo_path)

    # get dimensions of plot for scaling
    plot_height <- magick::image_info(plot)$height
    plot_width <- magick::image_info(plot)$width

    # default scale to 1/10th width of plot
    # Can change with logo_scale
    logo <- magick::image_scale(logo_raw, as.character(plot_width/logo_scale))

    # Get width of logo
    logo_width <- magick::image_info(logo)$width
    logo_height <- magick::image_info(logo)$height

    # Set position of logo
    # Position starts at 0,0 at top left
    # Using 0.01 for 1% - aesthetic padding

    if (logo_position == "top right") {
        x_pos = plot_width - logo_width - 0.01 * plot_width
        y_pos = 0.01 * plot_height
    } else if (logo_position == "top left") {
        x_pos = 0.01 * plot_width
        y_pos = 0.01 * plot_height
    } else if (logo_position == "bottom right") {
        x_pos = plot_width - logo_width - 0.01 * plot_width
        y_pos = plot_height - logo_height - 0.01 * plot_height
    } else if (logo_position == "bottom left") {
        x_pos = 0.01 * plot_width
        y_pos = plot_height - logo_height - 0.01 * plot_height
    }

    # Compose the actual overlay
    magick::image_composite(plot, logo, offset = paste0("+", x_pos, "+", y_pos))

}

# Get data from understat
premierleague2019 <- understatr::get_league_teams_stats("EPL", 2019)

# tidy data and plot
## set fig.height = 7, fig.width = 9

xGD_plot <- premierleague2019 %>% 
  select(team_name, everything()) %>% 
  group_by(team_name) %>% 
  summarize(sum_npxG = sum(npxG),
            sum_npxGA = sum(npxGA)) %>% 
  mutate(npxGD = sum_npxG - sum_npxGA,
         team_name = as_factor(team_name),
         team_name = fct_reorder(team_name, npxGD),
         half = npxGD / 2) %>% 
  arrange(desc(npxGD)) %>% 
  ggplot(aes(x = team_name, y = npxGD)) +
  geom_col(color = "black", fill = "#00ff85") +
  geom_text(aes(y = half, label = round(npxGD, digits = 1)), 
            color = "#38003c", size = 4, fontface = "bold",
            family = "Roboto Condensed") +
  scale_y_continuous(expand = c(0.01, 0)) +
  labs(title = "Non-Penalty Expected Goal Difference",
       subtitle = "As of Nov. 10, 2019 (Matchday 12)",
       x = NULL, y = "Non-Penalty xGD",
       caption = glue("Twitter: @R_by_Ryo                                                                             Data: understat.com")) +
  theme_minimal() +
  theme(text = element_text(family = "Roboto Condensed",
                            color = "white"),
        title = element_text(size = 18),
        axis.text = element_text(color = "white", size = 14),
        plot.background = element_rect(fill = "#38003c")) +
  coord_flip()

## Noice!
xGD_plot

# save initial plot
## replace `filename` with what/whereever you want to save it
ggsave(plot = xGD_plot,
       filename = here::here("Premier League 2019-2020/output/xGD_plot.png"),
       height = 7, width = 9)
       
# add logo via {magick}
xGD_plot_logo <- add_logo(
  plot_path = here::here("Premier League 2019-2020/output/xGD_plot.png"),
  logo_path = "https://static.dezeen.com/uploads/2016/08/designstudiopremier-league-rebrand-relaunch-logo-design-barclays-football_dezeen_slideshow-a-852x609.jpg",
  logo_position = "top right",
  logo_scale = 10)
  
## Toit!
xGD_plot_logo

# save final plot
## replace `filename` with what/whereever you want to save it
image_write(image = xGD_plot_logo, 
            path = here::here("Premier League 2019-2020/output/xGD_plot_logo.png"))