Hex Turtles Example

to setup
  clear-all
  set-default-shape turtles "arrow half"
  crt 500
    [ move-to one-of patches
      ;; turtle headings must be multiples of 60
      set heading 60 * random 6
      ;; shift even columns down
      if pxcor mod 2 = 0
        [ set ycor ycor - 0.5 ] ]
  reset-ticks
end 

to go
  ;; turtles do a random walk (usually going straight,
  ;; occasionally turning)
  ask turtles
    [ hex-fd
      rt one-of [-60 0 0 0 0 0 60] ]
  tick
end 

to hex-fd  ;; turtle procedure
   ;; the world must be an even size grid so that when the turtles wrap
   ;; there are not two even or two odd columns in a row.
   setxy (xcor + item (heading / 60) [0 1 1 0 -1 -1])
         (ycor + item (heading / 60) [1 0.5 -0.5 -1 -0.5 0.5])
end 


; Public Domain:
; To the extent possible under law, Uri Wilensky has waived all
; copyright and related or neighboring rights to this model.