EPICYC
Quick Basic Program
From each of 120 points on a guide circle, a line is drawn to the point
(n+1) times further along the guide circle.
The envelope formed by all of these lines is an epicycloid of
n cusps. This program is a crude implementation of the
algorithm presented by David Crawford in the article
“Curves from Straight Lines”, in “SYMmetry plus”,
#15, Summer 2001
(Mathematical Association),
page 10.
Sample output
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Created 2001 08 17 and modified 2001 08 17 by
Dr. G.H. George