canvas-multiple-object.kt

val itemsToAnimate = remember {
    mutableStateOf<List<ItemState>>(mutableListOf())
}

val itemsChannel = remember {
    Channel<List<ItemState>>(Channel.UNLIMITED)
}
var job: Job? = remember {
    null
}

LaunchedEffect(true) {
    for (_items in itemsChannel) {
        job?.cancel()
        job = launch {
            withContext(Dispatchers.IO) {
                val items = _items.toMutableList()
                while (true) {
                    withFrameMillis {
                        val iterator = items.iterator()
                        var i = 0
                        while (iterator.hasNext()) {
                            val element = iterator.next() //element is ItemState
                            val elapsedTime = System.nanoTime() - element.startTime
                            items.safeSet(i) { 
                                it.copy(
                                    y = element.yAnimation.getValueFromNanos(counter),
                                    x = element.xAnimation.getValueFromNanos(counter),
                                )
                            i++
                        }
                        hearts.value = items.toMutableList()
                    }
                }
            }
        }
    }
}