TidyTuesday 2020 Week 33

An animation of the main characters in Avatar

Visualization

 

Things I learned

• Really basic image manipulation with {magick}

• That you can get away with not doing the data part of data visualization for TidyTuesday

Things to improve

• Should’ve picked a better color to represent air for Aang.

• Not sure why it looks like white grid lines are there. All my attempts at getting rid of them failed, so I’ve just concluded that they’re likely an optical illusion.

Code

Also available on github

library(tidyverse)
library(magick)
library(gganimate)

aang <- image_read("https://vignette.wikia.nocookie.net/avatar/images/a/ae/Aang_at_Jasmine_Dragon.png")
iroh <- image_read("https://vignette.wikia.nocookie.net/avatar/images/c/c1/Iroh_smiling.png")
sokka <- image_read("https://vignette.wikia.nocookie.net/avatar/images/c/cc/Sokka.png")
toph <- image_read("https://vignette.wikia.nocookie.net/avatar/images/4/46/Toph_Beifong.png")

# Script by Georgios Karamanis adapted and wrapped into a function
# - from https://github.com/gkaramanis/aRt/blob/master/split-bar/points-portraits.R
img_to_df <- function(img, index) {
  
  img <- image_convert(img, colorspace = "gray")
  
  img_w <- image_info(img)$width
  img_h <- image_info(img)$height
  
  if (img_w >= img_h) {
    img <- image_resize(img, "120")
  } else {
    img <- image_resize(img, ("x120"))
  }
  
  img_array <- drop(as.integer(img[[1]]))
  rownames(img_array) <- 1:nrow(img_array)
  colnames(img_array) <- 1:ncol(img_array)
  
  as.data.frame.table(img_array) %>% 
    `colnames<-`(c("y", "x", "b")) %>% 
    mutate(
      across(everything(), as.numeric),
      bf = 1 - b / 255
    ) %>% 
    mutate(character_id = index)
}

plot_data <- imap_dfr(list(aang, iroh, sokka, toph), ~img_to_df(.x, .y)) %>% 
  group_by(character_id) %>% 
  mutate(point_id = 1:n()) %>% 
  ungroup() %>% 
  mutate(across(contains("id"), as.factor))

anim <- ggplot(plot_data) +
  geom_point(aes(x = x, y = y, size = bf, group = point_id, color = character_id),
             shape = 16, show.legend = FALSE) +
  scale_y_reverse() +
  scale_size_continuous(range = c(0, 4)) +
  scale_color_manual(values = c("#C0EDFF", "#B33000", "#206BA4", "#8B4513")) +
  coord_fixed(expand = FALSE) +
  theme_void() +
  theme(panel.grid = element_blank()) +
  transition_states(id)

animate(anim, width = 12, height = 9, units = "in", res = 120)