From ranchbots
%! Postscript utility for printing an encoder wheel
%
/inch {72 mul} def % #points/inch (don't change me)
/size 0.5 inch def % radius of encoder wheel
/segments 16 def % number of segments (black and white)
/angle 360 segments div def
/wedge
{ /radius exch def
/angle_s exch def
/angle_e exch def
newpath 0 0 moveto
0 0 radius angle_s angle_e arc
closepath
} def
gsave
1.0 inch 1.0 inch translate
0 1 segments {
360 segments div rotate
angle 0 size wedge
2 mod 0 eq {1} {0} ifelse
setgray fill
} for
grestore
showpage