Creating a real-time magnifier

[Richmond Mathewson]

Richard Miller wrote:
> Any thoughts on how to magnify (by 2x) a 100x100 section of the screen 
> in real time? I can't see how export snapshot could be used for 
> this.... not in real time. Perhaps it involves manipulating 
> screen/picture data, but I don't have the experience in doing this. 
> I'd like the user to be able to move a 100x100 rectangle over the 
> screen and have that section of the screen magnified to double and 
> displayed in a rectangle in a corner.
>
> Thanks for any suggestions.
> Richard Miller
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As far as I recall, this was done in Hypercard . . .