calculateZoom

fun PointerEvent.calculateZoom(): Float

Uses the change of the centroid size between the PointerInputChange.previousPosition and PointerInputChange.position to determine how much zoom was intended.

Example Usage:

Code Examples

CalculateZoom

@Composable
fun CalculateZoom() {
    var zoom by remember { mutableStateOf(1f) }
    Box(
        Modifier.graphicsLayer(scaleX = zoom, scaleY = zoom)
            .background(Color.Blue)
            .pointerInput(Unit) {
                awaitEachGesture {
                    awaitFirstDown()
                    do {
                        val event = awaitPointerEvent()
                        zoom *= event.calculateZoom()
                    } while (event.changes.any { it.pressed })
                }
            }
            .fillMaxSize()
    )
}