Zooming in to a specific part of the page

[Aditya Mahajan <adityam@umich.edu>]

Hi,

Is it possible to zoom into a specific part of the page? I am thinking of 
the following scenario. Suppose I have the following document

\setuppapersize[S6][S6]
\starttext
\placefigure[right,none]{\externalfigure[dummy][width=0.3\textwidth]}
\input knuth

\page

\input tufte

\stoptext

I want that when I click on the image, the pdf is zoomed in so that the 
image occupies the full screen[1], and when I click on the zoomed in 
image, it zooms out and I get the previous page view.

How do I achieve this? I am guessing that some javascript magic might be 
needed, but I do not understand the interaction code at all. This feature 
will be pretty handy for presentations.

Thanks
Aditya

[1]: I do not know if the pdf reader knows the screen size. Assuming that 
the screen aspect ratio is the same as the page aspect ratio might be a 
good approximation (at least for presentations).
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