Попытка создать анимацию с простыми функциями, по существу, временными рядами пространственной переменной в форме картограммы.
Проблема в том, что многоугольники летают по всему графику во время анимации.
Вот воспроизводимый пример, частично снятый с https://www.blog.cultureofinsight.com/2017/09/animated-choropleth-maps-in-r/ (в котором использовалась более старая версия gganimate
.
Загрузка пакетов:
library(tidyverse) # dev ggplot version required: devtools::install_github("hadley/ggplot2")
library(sf)
library(readxl)
library(httr)
library(gganimate)
Получение и упорядочение данных для воспроизводимого примера.
# download the natural earth shapefile we need into your working directory
URL <- "http://www.naturalearthdata.com/http//www.naturalearthdata.com/download/110m/cultural/ne_110m_admin_0_map_units.zip"
temp <- tempfile()
download.file(URL, temp)
unzip(temp)
unlink(temp)
# read in shapefile as an sf object and set the projection
# this will be our base world map for plot sans Antarctica
world <- st_read("ne_110m_admin_0_map_units.shp") %>%
st_transform(crs = "+proj=longlat +datum=WGS84") %>%
filter(!NAME %in% c("Fr. S. Antarctic Lands", "Antarctica"))
# download dataset into your working directory
url <- "https://www.blog.cultureofinsight.com/data/wc.xlsx"
GET(url, write_disk("wc.xlsx", overwrite=TRUE))
# read in our the massive 20 rows of data and get the winner/runner-up variable in 1 column #tidyafdata
# setting factor for winner to show first in the legend
winners <- read_excel("wc.xlsx") %>%
gather(w_l, country, winner:runner_up) %>%
mutate(w_l = factor(w_l, levels = c("winner", "runner_up")))
# merge our world shape file with our main dataset
# this will add the polygon for the appropriate country to each row of our winners dataset
# and remove any countries that haven't won or come 2nd in the WC
wc_geo <- left_join(world, winners, by = c("NAME" = "country")) %>%
st_as_sf() %>%
drop_na(Year)
Создание объекта gganimate:
wc_map <- ggplot() +
geom_sf(data = world, colour = "#ffffff20", fill = "#2d2d2d60", size = .5) +
geom_sf(data = wc_geo, aes(fill = w_l)) +
coord_sf(crs = st_crs(world), datum = NA) +
scale_fill_manual(values = c("#D9A441", "#A8A8A8"), name = NULL, labels = c("Winner", "Runner-Up")) +
theme(legend.position = c(0.9, 1.01), legend.direction = "horizontal", axis.text = element_blank(),
panel.grid.minor = element_blank(), panel.grid.major = element_blank()) +
transition_time(Year)
Animate:
animate(wc_map)
Это результат: