This is a generator version of tween_at() with the additional functionality
of supporting enter and exit functions. It returns a generator that can be
used with get_frame() and get_raw_frames() to extract frames for a
specific time point scaled between 0 and 1.
gen_at(from, to, ease, id = NULL, enter = NULL, exit = NULL)A data.frame or vector of the same type. If either is of length/nrow 1 it will get repeated to match the length of the other
A character vector giving valid easing functions. Recycled to
match the ncol of from
The column to match observations on. If NULL observations will be
matched by position. See the Match, Enter, and Exit section for more
information.
functions that calculate a start state for new observations
that appear in to or an end state for observations that are not present in
to. If NULL the new/old observations will not be part of the tween. The
function gets a data.frame with either the start state of the exiting
observations, or the end state of the entering observations and must return
a modified version of that data.frame. See the Match, Enter, and Exit
section for more information.
A keyframe_generator object
Other Other generators:
gen_along(),
gen_components(),
gen_events(),
gen_keyframe()
gen <- gen_at(mtcars[1:6, ], mtcars[6:1, ], 'cubic-in-out')
get_frame(gen, 0.3)
#> mpg cyl disp hp drat wt qsec vs am gear carb
#> 1 20.6868 6.000 167.02 109.460 3.77688 2.71072 16.86608 0.108 0.892 3.892 3.676
#> 2 20.7516 6.216 181.60 117.020 3.81900 2.93602 17.02000 0.000 0.892 3.892 3.784
#> 3 22.6488 4.216 124.20 94.836 3.76684 2.41666 18.69964 1.000 0.892 3.892 1.000
#> 4 21.5512 5.784 241.80 108.164 3.16316 3.11834 19.35036 1.000 0.108 3.108 1.000
#> 5 18.9484 7.784 338.40 167.980 3.23100 3.37898 17.02000 0.000 0.108 3.108 2.216
#> 6 18.4132 6.000 217.98 105.540 2.88312 3.36928 19.81392 0.892 0.108 3.108 1.324
#> .phase
#> 1 transition
#> 2 transition
#> 3 transition
#> 4 transition
#> 5 transition
#> 6 transition