I reworked the postscript program so you can specify encoder wheel size,
and index pulse width for an encoder, then you can call the subroutine
(done twice at the bottom) at different places on the paper.
Hopefully the instructions in another message for using GIMP can get
you the resolution you need.
On 06/02/2012 03:58 PM, gene heskett wrote:
> Thanks cogoman. This would be useful if I had room for a 6" OD wheel, but
> my limit in the space I have is about 2.7" in diameter.
%! Postscript utility for printing multiple encoder wheels
/inch {72 mul} def % #points/inch (don't change me)
/sizeo 2 inch def % outside radius of encoder wheel
/sizei 1.8 inch def % inside radius of encoder wedges
/segments 256 def % number of segments (black and white)
/ipwidth 5.5 def % width of index pulse bar
/moveout 4 def % how far from left side to put encoder wheel
/moveup 4 def % how far from the bottom to put the encoder wheel
/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
/encoder
{
% ADD IN THE ENCODER WHEEL AT THE SPECIFIED DIAMETER
gsave
0 1 segments {
360 segments div rotate
angle 0 sizeo wedge
2 mod 0 eq {1} {0} ifelse
setgray fill
} for
grestore
%THIS ROUTINE FILLS THE CENTER WITH WHITE, AND SOMEHOW PUTS A
SOLID CIRCLE
% INSIDE THE GROUP OF WEDGES
%THIS LINE SPECIFIES WHERE TO PUT THE CENTER
0 0 sizei 0 360 arc
gsave
0 setgray stroke
grestore
9 setgray fill
ipwidth 0 sizei wedge
0 setgray fill
%THIS ROUTINE PUTS A TINY DOT IN THE CENTER TO AID IN MOUNTING
THE DISC
%THIS LINE SPECIFIES WHERE TO PUT THE CENTER
0.0 inch 0.0 inch .01 inch 0 360 arc
gsave
stroke
grestore
0 setgray fill
} def
gsave
2.5 inch 2.5 inch translate
encoder
grestore
2.5 inch 7.5 inch translate
encoder
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