[metapost] Some observations on turning and self intersection
Giuseppe Bilotta
gip.bilotta at iol.it
Sun Feb 6 00:40:45 CET 2005
Saturday, February 5, 2005 Werner LEMBERG wrote:
>> The condition for a loop is then (a x c)^2 < 4(a x b)(b x c).
> The disadvantage of computing the cross product is that its components
> can become very large.
IIRC MF/MP is able to calculate sine and cosine of angles
between vectors; if this is indeed the case, the explicit
formula
|a||c| sin^2(a->c) < 4 |b|^2 sin(a->b) sin (b->c)
should be less sensitive to buffer overflows ...
--
Giuseppe "Oblomov" Bilotta
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