tween_components: Interpolate individual component

In tweenr: Interpolate Data for Smooth Animations

Interpolate individual component

Description

This function is much like tween_elements() but with a slightly different syntax and support for many of the newer features such as enter/exits and tween phase identification. Furthermore it uses tidy evaluation for time and id, making it easier to change these on the fly. The biggest change in terms of functionality compared to tween_elements() is that the easing function is now given per column and not per row. If different easing functions are needed for each transition then tween_elements() is needed.

Usage

tween_components(
  .data,
  ease,
  nframes,
  time,
  id = NULL,
  range = NULL,
  enter = NULL,
  exit = NULL,
  enter_length = 0,
  exit_length = 0
)

Arguments

.data	A data.frame with components at different stages
ease	The easing function to use. Either a single string or one for each column in the data set.
nframes	The number of frames to calculate for the tween
time	An unquoted expression giving the timepoint for the different stages of the components. Will be evaluated in the context of .data so can refer to a column from that
id	An unquoted expression giving the component id for each row. Will be evaluated in the context of .data so can refer to a column from that
range	The range of time points to include in the tween. If NULL it will use the range of time
enter, exit	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.
enter_length, exit_length	The lenght of the opening and closing transitions if enter and/or exit is given. Measured in the same units as time

Value

A data.frame with the same columns as .data along with .id giving the component id, .phase giving the state of each component in each frame, and .frame giving the frame membership of each row.

See Also

Other data.frame tween: tween_along(), tween_appear(), tween_elements(), tween_events(), tween_states()

Examples

from_zero <- function(x) {x$x <- 0; x}

data <- data.frame(
  x = c(1, 2, 2, 1, 2, 2),
  y = c(1, 2, 2, 2, 1, 1),
  time = c(1, 4, 10, 4, 8, 10),
  id = c(1, 1, 1, 2, 2, 2)
)

data <- tween_components(data, 'cubic-in-out', nframes = 100, time = time,
                         id = id, enter = from_zero, enter_length = 4)

tweenr documentation built on May 29, 2024, 6:32 a.m.