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1992-04-21
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Help File For Ohno L-Systems
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Symmetric Space-filling Fractal Curves
John Greening
Most people would be very happy to have just one or two space-filling
curves named after them, e.g. Gosper, Hilbert and Peano. However, Yoshio
Ohno and Koichi Ohyama have published a whole catalogue of symmetric self-
similar space-filling curves in the Journal of Recreational Mathematics,
Vol.23, pp161-174, 1991. In that paper they draw the generators of their
curves and I have used a simple L-System program to enable the full fractal
curves to be plotted on an Archimedes.
In general the generators are very complex having up to 49 steps. Those
based on a square grid start with an "S" and those on a triangular grid
start with a "T". The number indicates the steps in the generator and a
lower case letter is used to distinguish between otherwise similar curves.
(The curve T7a2 is in fact the same as the Gosper fractal).
John Greening
15 Pentland Crescent
Edinburgh, EH10 6NS
Adapted for !Fractal by Mike Curnow.