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Re: Non-quadratic form of whiteout

From: David Kastrup
Subject: Re: Non-quadratic form of whiteout
Date: Sun, 16 Sep 2018 18:17:53 +0200
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/27.0.50 (gnu/linux)

Kieren MacMillan <address@hidden> writes:

> Hi Urs,
>> Am I getting something wrong here: why are you asking about
> intermediate points? Aren't we only interested in the whiteout around
> the outer edges?
> Consider the letter O, with 'outline #'(5 . 0). It’s easy to see that
> the thickness on top (at the "N" compass point) is 5 units, and the
> thickness on the right (at the "E" compass point). But we need to
> determine the thickness at the "NW" (45º) compass point — that
> requires interpolation between 5 and 0, right?

I don't see what the point in that would be.  You put a white rectangle
on every point of the shape.  That's all.  The outline will be traced by
pieces parallel to the original outline, with some handover when the
baton of the outermost shape passes between corners of the rectangle.

David Kastrup

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