zoom
The amount by which the zoom level increases or decreases during a double-tap-to-zoom-in or double-touch-to-zoom-out gesture. 1.0 by default. Must be positive. Default value: 1.
The amount by which the zoom level increases or decreases during a double-tap-to-zoom-in or double-touch-to-zoom-out gesture. 1.0 by default. Must be positive. Default value: 1.