Using the generators in tweenr you can avoid calculating all needed frames up
front, which can be prohibitive in memory. With a generator you can use
get_frame() to extract any frame at a fractional location between 0 and 1
one by one as you need them. You can further get all raw data before and/or
after a given point in time using get_raw_frames().
get_frame(generator, at, ...)
get_raw_frames(generator, at, before = 0, after = 0, ...)A frame_generator object
A scalar numeric between 0 and 1
Arguments passed on to methods
Scalar numerics that define the time before and after
at to search for raw data
data <- data.frame(
x = c(1, 2, 2, 1, 2, 2),
y = c(1, 2, 2, 2, 1, 1),
time = c(1, 4, 8, 4, 8, 10),
id = c(1, 1, 1, 2, 2, 2)
)
gen <- gen_components(data, 'cubic-in-out', time = time, id = id)
get_frame(gen, 0.3)
#> x y time id .phase
#> 1 1.996 1.996 3.988 1 transition
get_raw_frames(gen, 0.5, before = 0.5, after = 0.2)
#> $before
#> x y time id .phase
#> 1 1 1 1 1 raw
#> 2 2 2 4 1 raw
#> 4 1 2 4 2 raw
#>
#> $after
#> [1] x y time id .phase
#> <0 rows> (or 0-length row.names)
#>