If @gesture is active, this function returns the zooming difference since the gesture was recognized (hence the starting point is considered 1:1). If @gesture is not active, 1 is returned.
Return: the scale delta
3.14
See Implementation
If @gesture is active, this function returns the zooming difference since the gesture was recognized (hence the starting point is considered 1:1). If @gesture is not active, 1 is returned.
Return: the scale delta