将 tweenr 和 gganimate 与条形图结合使用

Question

如何使用 tweenr 和 gganimate 在下面的两个条形图之间创建非常流畅的动画？

library(tweenr)
library(gganimate)
library(tidyverse)

df <- tibble(
  decile = c("lowest", "second", "third", "lowest", "second", "third"),
  change = c(1, 2, -0.5, -2, -3, 4),
  year = c(2001L, 2001L, 2001L, 2002L, 2002L, 2002L)
)

df2001 <- filter(df, year == 2001)
df2002 <- filter(df, year == 2002)

ggplot(df2001, aes(x = decile, y = change)) +
  geom_col() +
  scale_y_continuous(limits = c(-5, 5)) +
  theme_minimal()

ggplot(df2002, aes(x = decile, y = change)) +
  geom_col() +
  scale_y_continuous(limits = c(-5, 5)) +
  theme_minimal()

Answer 1

编辑：更改 transition_states 和 ease_aes 以在过渡上花费更多时间，增加字体大小，并更改 animate 术语以延长持续时间并减慢移动速度。

a <- ggplot(df, aes(x = decile, y = change/2, 
                    height = change, width = 0.9, group = decile)) +
  geom_tile() +
  scale_y_continuous(limits = c(-5, 5), name = "change") +
  theme_minimal(base_size = 16) +
  transition_states(year, wrap = T, transition_length = 10, state_length = 1) +
  ease_aes("cubic-in-out")

animate(a, fps = 30, duration = 10, width = 500, height = 300)
# Use up to two of fps, nframes, and duration to define the
#   length and frame rate of the animation.

请注意，我在上面使用了 geom_tile，因为 geom_col 在转换时产生了这种非常规行为。我怀疑绘制的 geom_col 不区分其基线和范围，而是区分其最小值和最大值，从而导致 "sliding" 动画。（好奇其他人是否看到更简单的解决方法。）

a <- ggplot(df, aes(x = decile, y = change)) +
  geom_col() +
  ...

将 tweenr 和 gganimate 与条形图结合使用

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