You R my Valentine!

[This article was first published on Johannes B. Gruber on Johannes B. Gruber, and kindly contributed to R-bloggers]. (You can report issue about the content on this page here)
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Today is Valentine’s Day. And since both I and my sweetheart are R enthusiasts, here is how to say “I love you” using a statistical programming language:

library("dplyr")
library("gganimate")
library("ggplot2")

hrt_dat <- data.frame(t = seq(0, 2 * pi, by = 0.01)) %>%
  bind_rows(data.frame(t = rep(max(.$t), 300))) %>% 
  mutate(xhrt = 16 * sin(t) ^ 3,
         yhrt = 13 * cos(t) - 5 * cos(2 * t) - 2 * cos(3 * t) - cos(4 * t),
         frame = seq_along(t)) %>% 
  mutate(text = ifelse(frame > 300, "            J", "")) %>%
  mutate(text = ifelse(frame > 500, "A           J", text)) %>%
  mutate(text = ifelse(frame > 628, "A     +     J", text)) %>% 
  mutate(texty = 0, textx = 0)

ggplot(hrt_dat, aes(x = xhrt, y = yhrt)) +
  geom_line(colour = "#C8152B") +
  geom_polygon(fill = "#C8152B") +
  geom_text(aes(x = textx, y = texty, label = text), 
            size = 18, 
            colour = "white",
            vjust = "center") +
  theme_void() +
  transition_reveal(frame)

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