private void Knob_PointerDown(object sender, PointerRoutedEventArgs e)
{
_startPos = e.GetCurrentPoint(Base).Position;
_prevAngle = _prevDistance = 0;
Knob.CapturePointer(e.Pointer);
pointerOutOfArea = false;
pointer = e.Pointer;
}
private void Knob_PointerPressed(object sender, PointerRoutedEventArgs e)
{
startPosition = e.GetCurrentPoint(Base).Position;
startPosition.X -= knobPosition.X;
startPosition.Y -= knobPosition.Y;
Captured?.Invoke(this, EventArgs.Empty);
pointerCaptured = Knob.CapturePointer(e.Pointer);
}