transition-rotate-complete.kt

private val rotation = FloatPropKey()

private fun createDefinition(duration: Int) = transitionDefinition {
    state(0) { this[rotation] = 0f }
    state(1) { this[rotation] = 360f }

    transition {
        rotation using repeatable {
            animation = tween {
                easing = LinearEasing
                this.duration = duration
            }
            iterations = Infinite
        }
    }
}

@Composable
fun RotateIndefinitely(durationPerRotation: Int, children: @Composable() () -> Unit) {
    Transition(definition = createDefinition(durationPerRotation), initState = 0, toState = 1) {
        Rotate(it[rotation], children)
    }
}

@Composable
fun Rotate(degree: Float, children: @Composable() () -> Unit) {
    Draw(children = children) { canvas, parent ->
        val halfWidth = parent.width.value / 2
        val halfHeight = parent.height.value / 2

        canvas.save()
        canvas.translate(halfWidth, halfHeight)
        canvas.rotate(degree)
        canvas.translate(-halfWidth, -halfHeight)
        drawChildren()
        canvas.restore()
    }
}