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%!CairoScript
/pot { % n -- n
1 sub
dup -1 bitshift or
dup -2 bitshift or
dup -4 bitshift or
dup -8 bitshift or
dup -16 bitshift or
1 add
} bind def
/direction { % i -- bool
dup 2 lt { pop true } {
dup 1 add dup pot dup 3 -1 roll eq { pop pop true } {
2 div 1 sub 2 mul exch sub direction not
} ifelse
} ifelse
} bind def
/path { % cr dx dy -- cr
0 1 2048 {
4 1 roll 3 copy L pop 4 -1 roll direction {
exch neg
} {
neg exch
} ifelse
} for
pop pop
} bind def
dict
/width 512 set
/height 512 set
surface context
1 g set-source paint
//LINE_CAP_ROUND set-line-cap
//LINE_JOIN_ROUND set-line-join
4 set-line-width
256 256 m 12 0 path 0 0 0 rgb set-source stroke
256 256 m -12 0 path 1 0 0 rgb set-source stroke
256 256 m 0 12 path 0 1 0 rgb set-source stroke
256 256 m 0 -12 path 0 0 1 rgb set-source stroke
/target get (out.png) write-to-png pop
pop
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