\ example of edge-rewriting system for L-machine
\ This one implements a type of non-self-intersecting curve
\ Called a Hilbert Curve.

n = 3
delta = 45.0
X0 = 220.0
Y0 = 10.0

initial = --L   \ initial = turn left, left turn

\ define macros for turtle

macros

R = --F+F+F+F+F--
L = ++F-F-F-F-F++

endm

rules

L = LF++RFR++FL--F--LFLFL--FRFR++
R = --LFLF++RFRFR++F++RF--LFL--FR

endrules
end