This shadow lets you show the raw data behind the current frame. Both past and/or future raw data can be shown and styled as you want.
shadow_mark(past = TRUE, future = FALSE, ..., exclude_layer = NULL)
Should raw data from earlier in the animation be shown
Should raw data from later in the animation be shown
changes to the shadow data, e.g.
alpha = alpha/2 or
colour = 'grey'
Indexes of layers that should be excluded.
# Use any of the aesthetics to add a style to either the past or the future raw data. # Adding a grouping variable in a transition call prior to calling `shadow_mark()` will # allow transitioning through different states in time. p1 <- ggplot(airquality, aes(Day, Temp)) + geom_line(color = 'red', size = 1) + transition_time(Month) + shadow_mark(colour = 'black', size = 0.75) # animate(p1) # Add a future = TRUE argument to show data later in the animation. p2 <- ggplot(airquality, aes(Day, Temp)) + geom_line(color = 'red', size = 1) + transition_time(Month) + shadow_mark(color = 'black', size = 0.75, past = FALSE, future = TRUE) # animate(p2)