center_xnumber · requiredCenter X coordinate (>= 0)
Performs a pinch-to-zoom gesture centered at the specified coordinates.
center_xnumber · requiredCenter X coordinate (>= 0)
center_ynumber · requiredCenter Y coordinate (>= 0)
scalenumber · requiredScale factor (> 0; > 1 = zoom in, < 1 = zoom out)
durationnumber · default 300Gesture duration in ms (1-60000)