setViewScale(1.00)
window size: [320, 548]
zoom scale: 1.00

setViewScale(2.00)
window size: [160, 274]
zoom scale: 2.00

setViewScale(2.50)
window size: [128, 219]
zoom scale: 2.50

setViewScale(1.00)
window size: [320, 548]
zoom scale: 1.00