Hi Gaius,
> I was wondering if this idea has any wider usage (and whether it is
> feasible or whether the idea has been tried before?).
Are you aware of
A System for Algorithm Animation (Tutorial and User Manual).
CSTR #132, J. L. Bentley and B. W. Kernighan, Bell Labs, January
1987. Instrument your programs with graphics.
http://cm.bell-labs.com/cm/cs/cstr/132.ps.gz
Cheers,
Ralph.
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