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Amiga MA Magazine 1998 #6
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sierpinski
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1993-01-27
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625b
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48 lines
; the Sierpinski curve
if not procedurep "cs [ turtle ] [ ]
make "zig [
procedure [ [ :foo ] ]
if <= :foo 1 [
lt 45 fd :siz lt 45
; left 90
forward :siz
lt 45 fd :siz lt 45
; left 90
forward :siz
] [
zig / :foo 2
zag / :foo 2
zig / :foo 2
zag / :foo 2
]
]
make "zag [
procedure [ [ :foo ] ]
if <= :foo 1 [
rt 45 fd :siz rt 45
; right 90
forward :siz
rt 45 fd :siz rt 45
; right 90
forward :siz
lt 45 fd :siz lt 45
; left 90
forward :siz
] [
zag / :foo 2
zag / :foo 2
zig / :foo 2
zag / :foo 2
]
]
make "zigzag [
procedure [ [ :siz :foo ] ]
; cs
repeat 2 [ zig :foo ]
]