R 使用 gganimate 和 geom_text 制作动画线图

Question

我使用 gganimate 制作了动画情节，因此我可以看到 y 轴随时间的变化。

到目前为止，我有以下设置，它完成了我想要实现的大部分工作。但是，我绝对想再清理一下 geom_text 部分，以便其他人更容易看到。

我的目标

我想去掉所有帧中的固定起始量，因为它实际上没有任何用处。
文本显示该特定帧内的数量。我不想绘制像“81788.2”这样的原始数字，而是希望以“81k”之类的方式显示数量，类似于我设置 Y 轴的方式。我想要动画期间的这种一致模式。
如您所见，数字文本从图表中溢出。我想尽可能地包含图表中的数字。

任何关于如何实现这些的建议将不胜感激

anim3 <-
ggplot(trade_balance,(aes(x=Year, y=Amount,group=Trade_Balance,color=Trade_Balance)))+
  geom_line(size=2)+
  geom_text(aes(x = max(Year), label = Amount)) +
  transition_reveal(Year)+
  coord_cartesian(clip = 'off') + 
  scale_y_continuous(breaks = c(100000,200000,300000,400000,500000,600000),
                     labels=c("100k","200k","300k","400k","500k","600k"))+
  labs(x="Year", y="USD million",title="Forign trade statistic U.S. / China")
animate(anim3, renderer = gifski_renderer())

使用的数据框

> trade_balance
   Year   Amount Trade      Trade_Balance
1  2019 106447.3     1   Exports to China
2  2018 120289.3     1   Exports to China
3  2017 129997.2     1   Exports to China
4  2016 115594.8     1   Exports to China
5  2015 115873.4     1   Exports to China
6  2014 123657.2     1   Exports to China
7  2013 121746.2     1   Exports to China
8  2012 110516.6     1   Exports to China
9  2011 104121.5     1   Exports to China
10 2010  91911.1     1   Exports to China
11 2009  69496.7     1   Exports to China
12 2008  69732.8     1   Exports to China
13 2007  62936.9     1   Exports to China
14 2006  53673.0     1   Exports to China
15 2005  41192.0     1   Exports to China
16 2004  34427.8     1   Exports to China
17 2003  28367.9     1   Exports to China
18 2002  22127.7     1   Exports to China
19 2001  19182.3     1   Exports to China
20 2000  16185.2     1   Exports to China
21 1999  13111.1     1   Exports to China
22 2019 451651.4     0 Imports from China
23 2018 539243.1     0 Imports from China
24 2017 505165.1     0 Imports from China
25 2016 462420.0     0 Imports from China
26 2015 483201.7     0 Imports from China
27 2014 468474.9     0 Imports from China
28 2013 440430.0     0 Imports from China
29 2012 425619.1     0 Imports from China
30 2011 399371.2     0 Imports from China
31 2010 364952.6     0 Imports from China
32 2009 296373.9     0 Imports from China
33 2008 337772.6     0 Imports from China
34 2007 321442.9     0 Imports from China
35 2006 287774.4     0 Imports from China
36 2005 243470.1     0 Imports from China
37 2004 196682.0     0 Imports from China
38 2003 152436.1     0 Imports from China
39 2002 125192.6     0 Imports from China
40 2001 102278.4     0 Imports from China
41 2000 100018.2     0 Imports from China
42 1999  81788.2     0 Imports from China

Answer 1

下面的代码处理您的三项。我还做了一些其他更改，我希望这些更改会使代码更清晰并改善情节的外观。

library(tidyverse)
library(gganimate)

anim3 <- ggplot(trade_balance, 
                aes(x=Year, y=Amount, group=Trade_Balance, color=Trade_Balance)) +
  geom_line(size=2) +
  geom_text(aes(x=max(Year), label=sprintf("%1.0fk", Amount/1000)), 
            nudge_x=3, hjust=1, show.legend=FALSE, size=4.5) +
  transition_reveal(Year, keep_last=FALSE) +
  #coord_cartesian(clip = 'off') + 
  scale_y_continuous(breaks = seq(0, 6e5, 1e5),
                     labels = function(x) paste0(x/1e3,"k"),
                     expand = expansion(c(0, 0.05))) +
  scale_x_continuous(expand = expansion(c(0.02, 0.02))) +
  expand_limits(y=0,
                x=max(trade_balance$Year, na.rm=TRUE) + 3) +
  labs(x="Year", y="USD million",title="Foreign trade statistic U.S. / China",
       colour="Trade Balance") + 
  theme_bw(base_size=15)

animate(anim3, renderer = gifski_renderer(), height=400, width=550)
anim_save("anim_example.gif")

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