0th

Percentile

##### A trail of evenly spaced old frames

This shadow will trace the movement in your animation by keeping every nth frame and will thus produce a breadcrumb-like trail. Note that the shadow frames will not be equidistant in space but in time (that is, if a point moves slowly the crumbs will be closer to each other). It is possible to modify the look of the shadow by changing the different graphic parameters in the data

##### Usage
shadow_trail(distance = 0.05, max_frames = Inf, ...,
exclude_layer = NULL)
##### Arguments
distance

The temporal distance between the frames to show, as a fraction of the full animation length

max_frames

The maximum number of shadow frames to show

...

changes to the shadow data, e.g. alpha = alpha/2 or colour = 'grey'

exclude_layer

Indexes of layers that should be excluded.

Other shadows: shadow_mark, shadow_null, shadow_wake

##### Examples
# NOT RUN {
anim <- ggplot(airquality, aes(Day, Temp, colour = factor(Month))) +
geom_point() +
transition_time(Day)

# Change distance between points
anim1 <- anim +

anim2 <- anim +
shadow_trail(alpha = 0.3, shape = 2)

# Restrict the shadow to 10 frames
anim3 <- anim +