#!/usr/bin/ucblogo
;; Copyright 2012 Kevin Ryde
;;
;; This file is part of Math-PlanePath.
;;
;; Math-PlanePath is free software; you can redistribute it and/or modify it
;; under the terms of the GNU General Public License as published by the Free
;; Software Foundation; either version 3, or (at your option) any later
;; version.
;;
;; Math-PlanePath is distributed in the hope that it will be useful, but
;; WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
;; or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
;; for more details.
;;
;; You should have received a copy of the GNU General Public License along
;; with Math-PlanePath. If not, see .
;; cf A156595 xor adjacent mephisto waltz
;;
;;-----------------------------------------------------------------------------
to increment :var
make :var (thing :var)+1
end
to count.ternary.twos :n
localmake "count 0
while [:n <> 0] [
if [(remainder :n 3) = 2] [increment "count];
make "n int(:n/3)
]
output :count
end
to mephisto.turn.angle :n
output ifelse ((modulo (count.ternary.twos :n) 2) = 0) [60] [-60]
end
to mephisto :steps
right 90
left 45
penup
back 300
right 90
pendown
localmake "step.len 3
for [i 0 :steps 1] [
forward :step.len
left mephisto.turn.angle :i
]
end
mephisto 2000