anim_opacity: Animate an element through an opacity change
In omsvg: Build and Transform 'SVG' Objects

Description Usage Arguments Value Examples

Within an anims() call, itself passed to any anims argument, the anim_opacity() function can be used to express an animation where the target element undergoes a change in opacity with time.

1	anim_opacity(opacity = NULL, easing_fn = NULL, initial = FALSE)

`opacity`	The opacity value of the element at the keyframe time (given as the LHS value in the `anims()` call).
`easing_fn`	The timing or easing function to use for the animation. If not provided, the `linear()` timing function will be used (which is doesn't use any easing in the animation, just a linear movement). The other timing and easing functions are: `step_start()`, `step_end()`, `ease_in()`, `ease_out()`, and `ease_in_out()`.
`initial`	Should this opacity value be the initial opacity value of the element? If so, use `TRUE` and any value provided to `opacity` will be disregarded.

An anim_opacity object, which is to be used as part of an anims() call.

if (interactive()) {

# Basic animation of an element's
# opacity value (moving to a new
# `opacity` value of `0`)
SVG(width = 300, height = 300) %>%
  svg_rect(
    x = 50, y = 50,
    width = 50, height = 50,
    attrs = svg_attrs_pres(
      stroke = "magenta",
      fill = "lightblue"
    ),
    anims = anims(
      2.0 ~ anim_opacity(opacity = 0)
    )
  )
}