what would be the most simple infinite loop for an infinite

Question

what would be the most simple infinite loop for an infinite animation is it possible to animate without reading a state

nickbutcher · Answer

Just landed Cc < Doris Liu>

Adam Powell · Answer

That s still reading changing state though

Adam Powell · Answer

I m curious what motivated the question about animation without reading state

Doris Liu · Answer

If you d like to minimize the state reads you could consider the coroutine based animations The simplest is `suspend fun animate ` <https developer android com reference kotlin androidx compose animation core package summary animate> But even this has a bunch of state reads of the internally created states I d be curious what s the motivation for that preference as well slightly smiling face

Adriano Celentano · Answer

Im a bit ashamed to show my hacky code sweat smile I have a some top level properties which hold a Grid of Cells a Cell can be alive or dead each round i need to refresh the alive dead state of each cell and when each cell state was updated draw each cell again my hacky idea of doing it was just to increase the round count infinitely but i didnt need to read the round count state anywhere although updating my cell grid state in the in the composable functinon is probably even more hacky and causes to many updates sweat smile Will fix it and put my cell grid state in a compose state I think this coroutines based animation will help me to update my cell grid state Will write here again if it worked out

Adriano Celentano · Answer

Made this video so u can imagine how it looks with the currrent implementation point up

Adriano Celentano · Answer

so this works fine it just doesnt give me a delay in between each draw which actually seems fine in my case I could make the delay timing myself via coroutines but i thought i should use an AnimationClock somehow ``` LaunchedEffect Unit animate initialValue = 0f targetValue = 1f animationSpec = infiniteRepeatable animation = tween 1000 easing = LinearEasing repeatMode = RepeatMode Restart gt cellGrid value = calculateNextGrid cellGrid ```

Doris Liu · Answer

gt so this works fine it just doesnt give me a delay in between each draw which actually seems fine in my case Glad you gave it a try +1 How would you like the delay to work in your case gt I could make the delay timing myself via coroutines but i thought i should us an AnimationClock somehow `withFrameNanos Millis` is the new AnimationClock If you need to manipulate the timeline of an animation you could go one level lower and use the combination of + That would give you more control with more code slightly smiling face This combo is actually the implementation under the hood for all compose animation APIs that manage their own lifecycle

Adriano Celentano · Answer

super thank you pray will give it a try

Adriano Celentano · Answer

my idea was to have sth like this draw change state wait 300ms draw

Doris Liu · Answer

As in draw every 300ms i e show change at the rate of ~3fps For that you could either animate during that time and not draw or use the combo suggested above to update the animation once every 300ms The latter is more efficient slightly smiling face

Adriano Celentano · Answer

is there sth bad about this approach ```LaunchedEffect Unit while true cellGrid value = calculateNextGrid cellGrid delay 300 ```

Doris Liu · Answer

That looks fine Since the calculation is fairly light the vast majority of the time in the loop is waiting on `delay` which is cancellation cooperative Wouldn t hurt to make it `while isActive ` but not super critical

Adriano Celentano · Answer

i see that makes sense thx +1