Progressive line chart rendering
Before trying to build an animated plot with gganimate, make sure you understood how to build a line chart with R and ggplot2.
The idea is to add an additional aesthetics called transition_..() that provides a frame variable. For each value of the variable, a step on the chart will be drawn. Here, transition_reveal() is used to reveal each new time frame progressively.
Note that the gganimate automatically performs a transition between state.
# libraries:
library(ggplot2)
library(gganimate)
library(babynames)
library(hrbrthemes)
# Keep only 3 names
don <- babynames %>%
filter(name %in% c("Ashley", "Patricia", "Helen")) %>%
filter(sex=="F")
# Plot
don %>%
ggplot( aes(x=year, y=n, group=name, color=name)) +
geom_line() +
geom_point() +
scale_color_viridis(discrete = TRUE) +
ggtitle("Popularity of American names in the previous 30 years") +
theme_ipsum() +
ylab("Number of babies born") +
transition_reveal(year)
# Save at gif:
anim_save("287-smooth-animation-with-tweenr.gif")
