[metapost] Re: envelope proposal 4

[Boguslaw Jackowski]

Hi,

Larry:
> I reckon that the polygonal pen business was not an easy wicket for
> those who first worked it out. There is surely a literature on it;
> has anyone seen a good reference?

J. D. Hobby? (http://cm.bell-labs.com/who/hobby/pubs.html)

In particular:

* Rasterizing Curves of Constant Width, JACM 36(2), 1989.
* Digitized Brush Trajectories, Ph.D. thesis, Stanford University, 1985.
   (Also Stanford CS-TR-85-1070)

Larry:
> I am not keen to get seriously involved with polygonal pens...

But:
   * they do appear in practical applications;
   * eliptical pens are even more difficult to handle in _discrete_ geometry.

So, what would you advise?

Cheers -- Jacko

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