change aspect ratio on the fly

[demiantriebl]

hi, i try to change the aspect ratio putting $('#image').cropper({ aspectRatio : 16/9 })

and whit anothers buttons change to 1, 2/1, etc. but don't work, i solve this partially destroying the copprer and a new instance with the parameter aspectRatio. another solution?

(i can rotate the image on the fly, but aspect ratio not)