[cairo] Spirolaterals

Lawrence D'Oliveiro ldo at geek-central.gen.nz
Wed Oct 5 06:35:16 UTC 2016

I’ve been enhancing my curve script
to draw spirolaterals
<http://www.mi.sanu.ac.rs/vismath/krawczyk/spdesc00.htm>. Has anyone
else looked at these?

All the examples I have tried work fine--except for those with
reversing turns. My conclusion is that many of the examples shown here
<http://www.mi.sanu.ac.rs/vismath/krawczyk/spdesc03.htm> are mixed up
or just plain mislabelled. For example, in figure 6, the one labelled
(substituting slashes for subscripts) “9/90/1,2,3,4” should actually be
“9/90/1,2,3,9”, “9/90/2,3,4” should be “9/90/1,2,9” and “9/90/2,3,4,5”
should actually be “9/90/1,2,3,4”.

If there were a bug in my code, then for example I wouldn’t get
“9/90/1,2,3” correct--the errors would be more systematic.

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