Im animating my sine curve indefinetly horizontaly any bette

Question

Im animating my sine curve indefinetly horizontaly any better ideas how to do it ```LaunchedEffect key1 = Unit block = while isActive delay 50 horizontalAnimation value = horizontalAnimation value + 2 dp ```

Adriano Celentano · Answer

i animate the amplitude like this ```val transition = rememberInfiniteTransition val amplitudeAnimation = transition animateFloat initialValue = 1f targetValue = 1f animationSpec = InfiniteRepeatableSpec tween 3000 repeatMode = RepeatMode Reverse ```

Adam Powell · Answer

`withFrame Nanos|Millis frameTime gt ` is a better alternative than `delay ` then you can calculate the amount to animate by based on how much time elapsed since the previous frame `delay` will be janky and not align with frames

Adam Powell · Answer

< Doris Liu> would probably give some more idiomatic advice for the higher level animation system

jim · Answer

Is there ever a time when delay is the right function in a launched effect Maybe it should be a warning or something

Adam Powell · Answer

It depends on whether you re delaying for animation or for some other pulse The false positives might be worse than the benefits

jim · Answer

Just curious maybe I m not awake enough yet on a Sunday morning but why would you delay if not for 1 an animation or 2 sideways data loading which is an terrible practice that should be warned against anyway

Doris Liu · Answer

`withFrame Nanos|Millis ` makes total sense here for calculating the offset as you probably want a constant velocity One thing to watch out for is the rounding error as compounding rounding error on each frame may produce a subtle drift Alternatively an equally viable option would be to have an animation in a while loop to take care of that calculation rounding for you It could be something like ``` LaunchedEffect val horizontalAnimation = AnimationState Dp VectorConverter 0 dp while isActive horizontalAnimation animateTo horizontalAnimation value + 2 dp tween 50 easing = LinearEasing sequentialAnimation = true Update something with the animation value ```

Doris Liu · Answer

Re `delay` if you want to do something once per interval and the interval is long enough say 5 seconds that being off by one frame from not aligning with frame time is not a concern Seems like `delay` would be a convenient way to achieve that

jim · Answer

But why would you want to do that And shouldn t you be subscribed to a clock at that point rather than using delay Otherwise you are not going to behave correctly when someone accelerates time eg unit test and a variety of other circumstances where the delay approach is fragile

Doris Liu · Answer

Accelerating time in unit tests shouldn t be a problem for `delay` assuming you use the `TestCoroutineDispatcher` or implement `DelayController` correctly <https kotlin github io kotlinx coroutines kotlinx coroutines test kotlinx coroutines test delay controller advance time by html>

Adriano Celentano · Answer

thx for all the valuable info this slack channel is awesome pray