有什么方法可以创建以范围为过渡时间的动画(gganimate)?

时间:2019-03-14 21:02:56

标签: r ggplot2 gganimate

是否有办法使gganimate在几年的过渡时间内工作?在我的数据中,我有三个时间点,其中两个是范围,如下所示。

数据:

Year   rate   group
2012-2014   7   Other CT, White 
2015-2017   11  Other CT, White 
2018    3   Fairfield, Black    
2018    2   Fairfield, Hispanic

这是我要设置动画的ggplot代码的示例

data %>% ggplot(aes(y = rate, x = group)) +
  geom_col() +
  coord_flip() +
  labs(title = "Year: {frame_time}") +
  transition_time(Year)

当我将转换时间输入为“ Year”时,由于我的Year变量是可容纳范围的字符,因此会出现错误。这是我得到的错误:

Error: time data must either be integer, numeric, POSIXct, Date, difftime, orhms

我有什么办法可以绕过此错误并继续按原样运行范围?

1 个答案:

答案 0 :(得分:6)

我建议您使用transition_manual并将年份视为类别(失去平稳过渡),或者将年份范围转换为数字。

library(tidyverse); library(gganimate)
df1 <- tribble(~Year, ~rate, ~group,
               "2012-2014", 7, "grp1",
               "2015-2017", 11, "grp1",
               "2018", 3, "grp1")

第一种方法,将Year保持原样:

df1 %>% 
  ggplot(aes(y = rate, x = group)) +
  geom_col() +
  coord_flip() +
  labs(title = "Year: {current_frame}") +
  transition_manual(Year)

enter image description here

第二种方法,将年份转换为数字。在这种情况下,我只使用了第一年,但是您也可以将值分配给平均年,或者添加范围为每年的值的行。

df1 %>% 
  mutate(Year_numeric = parse_number(Year)) %>%
  ggplot(aes(y = rate, x = group)) +
  geom_col() +
  coord_flip() +
  labs(title = "Year: {round(frame_time)}") +
  transition_time(Year_numeric)

enter image description here

最后,如果要表示给定级别上的所有范围年份,则可以为所有组成年份创建行。但这需要一些肘部润滑脂:

df1 %>% 
  # For ranged years, find how many in range:
  mutate(year_num = 1 + if_else(Year %>% str_detect("-"), 
                            str_sub(Year, start = 6) %>% as.numeric() - 
                              str_sub(Year, end = 4) %>% as.numeric(), 
                            0)) %>%
  # ... and use that to make a row for each year in the range
  tidyr::uncount(year_num) %>%
  group_by(Year) %>%
  mutate(Year2 = str_sub(Year, end = 4) %>% as.numeric() + 
                 row_number() - 1) %>%
  ungroup() %>%

# FYI at this point it looks like:
# A tibble: 7 x 4
#  Year       rate group Year2
#  <chr>     <dbl> <chr> <dbl>
#1 2012-2014     7 grp1   2012
#2 2012-2014     7 grp1   2013
#3 2012-2014     7 grp1   2014
#4 2015-2017    11 grp1   2015
#5 2015-2017    11 grp1   2016
#6 2015-2017    11 grp1   2017
#7 2018          3 grp1   2018

ggplot(aes(y = rate, x = group)) +
  geom_col() +
  coord_flip() +
  labs(title = "Year: {round(frame_time)}") +
  transition_time(Year2)

enter image description here