Created
November 27, 2022 10:30
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#30DayMapChallenge 2022 - Day 19 - Globe
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# Animate an expanding buffer around land, with a "globe" view of the Pacific | |
library(glue) | |
library(stringr) | |
library(dplyr) | |
library(purrr) | |
library(sf) | |
library(rnaturalearth) | |
library(ggplot2) | |
library(av) | |
CRS_GLOBE <- "+proj=ortho +lat_0=-10 +lon_0=-160 +x_0=0 +y=0=0 +a=6371000 +b=6371000 +units=m +no_defs" | |
COLOUR_BG <- "grey10" | |
COLOUR_OCEAN <- "light blue" | |
COLOUR_LAND <- "dark green" | |
ocean <- | |
st_point(x = c(0, 0)) |> | |
st_buffer(dist = 6371000) |> | |
st_sfc(crs = CRS_GLOBE) | |
plot_the_frame <- | |
function(land_buffer) { | |
land_buffered <- | |
ne_countries(scale = "large", returnclass = "sf") |> | |
st_buffer(land_buffer) |> | |
st_intersection(ocean |> st_transform(crs = 4326L)) |> | |
st_transform(crs = CRS_GLOBE) | |
gg_frame <- | |
ggplot() + | |
geom_sf(data = ocean, fill = COLOUR_OCEAN, colour = NA) + | |
geom_sf(data = land_buffered, fill = COLOUR_LAND, colour = NA) + | |
theme_void() + | |
theme(plot.background = element_rect(fill = COLOUR_BG, colour = COLOUR_BG), | |
panel.background = element_rect(fill = COLOUR_BG, colour = COLOUR_BG)) | |
ggsave(plot = gg_frame, | |
filename = glue("frame_{str_pad(land_buffer, 6, pad = '0')}.png"), | |
path = "Day_19_Globe/frame/", | |
height = 8, width = 8) | |
} | |
(0:400 * 1000) |> | |
walk(plot_the_frame) | |
av_encode_video(list.files(path = "Day_19_Globe/frame", pattern = "png", full.names = TRUE), | |
framerate = 30, | |
output = "Day_19_Globe/Day_19_globe.mp4") |
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