Images drifting off screen

[a4992214]

Is there a way to limit the drifting. When I push an image with the mouse - it drifts in that direction but I am finding the image drifts off the screen, is there a way to set limits (i.e. to prevent the image from leaving the screen)?

[a4992214]

_pan = panzoom(_fullImage
, {bounds: true, boundsPadding: 0.3,
.....});