> Just a thought, but perhaps it would be just as easy to render a graph
> "down" the page.. Each scan line in the fax is just a start part to
> draw the axis, then some blank spaces, then the pixel shifted to the
> right spot.
>
> You could do a simple "header" which draws the start of the graph with
> the ticks and values at the top. This wouldn't need to change, so you
> could precomputed it and store it in EEPROM..
>
> Then you just output scan lines until you run out of data.. Can't be too
> hard to compute the compressed data for the graphs. Also not the "left"
> side of the graph could probably also be precomputed. You may want two
> versions of the left axis so you can put in tick marks..
>
> Having said that, rendering the text shouldn't be too hard from a stored
> bitmap font..

Have you considered sending an email message instead of a fax?  Since
you're willing to make a phone call, it could just as well be to an ISP or
a customer's machine running an SMTP server.  The SMTP client protocol is
rather easy to implement.  See RFC 821.  I think there are even email to
fax gateways.


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