[taos-glug] less C, more Guile

[This is partly a test of the new email list
server.]

Concerning the Guile tutorial, what
would be wrong with having just a few
C functions, and doing everything
else with Scheme?

Or, putting it another way, if you were
going to add new functions
to the tortoise program, would it be better
to write them in C or in Scheme?

For example, in the tutorial, XDrawLine figures
out which pixels to turn on between two points.

But you COULD get along if you didn't have
XDrawLine, but instead only had XDrawPoint, which just
turns on one pixel.   Scheme
code could figure out which pixels needed to
be turned on, and could call XDrawPoint multiple
times to draw the line.

I think it would be fun, and possibly educational,
to try it in Scheme.

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