calculateRotation

fun PointerEvent.calculateRotation(): Float

Returns the rotation, in degrees, of the pointers between the PointerInputChange.previousPosition and PointerInputChange.position states. Only the pointers that are down in both previous and current states are considered.

Example Usage:

Code Examples

CalculateRotation

@Composable
fun CalculateRotation() {
    var angle by remember { mutableStateOf(0f) }
    Box(
        Modifier.graphicsLayer(rotationZ = angle)
            .background(Color.Blue)
            .pointerInput(Unit) {
                awaitEachGesture {
                    awaitFirstDown()
                    do {
                        val event = awaitPointerEvent()
                        val rotation = event.calculateRotation()
                        angle += rotation
                    } while (event.changes.any { it.pressed })
                }
            }
            .fillMaxSize()
    )
}