postscript/life.ps at master · when/postscript · GitHub

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%!PS

% Copyright (C) 2003  Evan Danaher
%
% This program is free software; you can redistribute it and/or
% modify it under the terms of the GNU General Public License
% as published by the Free Software Foundation; either version 2
% of the License, or (at your option) any later version.
%
% This program is distributed in the hope that it will be useful,
% but WITHOUT ANY WARRANTY; without even the implied warranty of
% MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
% GNU General Public License for more details.
%
% You should have received a copy of the GNU General Public License
% along with this program; if not, write to the Free Software
% Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.


/Times-Roman findfont 12 scalefont setfont

/size 70 def
/cellsize 5 def
/numgens 10 def

/get2 {
   3 1 roll get exch get
} def

/put2 {
   /val exch def /c exch def /r exch def /tmpar2 exch def
   /tmpar tmpar2 r get def
   tmpar c val put
   tmpar2 r tmpar put
} def

/ar
size {
   0 size 1 sub { dup } repeat
   size array astore
} repeat
size array astore
def

/ar2
size {
   0 size 1 sub { dup } repeat
   size array astore
} repeat
size array astore
def

/diffs
size {
   0 size 1 sub { dup } repeat
   size array astore
} repeat
size array astore
def

/arcpy {
   /dest exch def /src exch def
   0 1 size 1 sub {
      /i exch def
      0 1 size 1 sub {
         /j exch def
         dest i j src i j get2 put2
      } for
   } for
} def

/disp {
   0 1 size 1 sub { /i exch def
      0 1 size 1 sub { /j exch def
         diffs i j get2 dup 0 ne {
            1 eq { 1 } { 0 } ifelse
            setgray
            newpath
            100 cellsize j mul add 500 cellsize i mul sub moveto
            0 cellsize rlineto
            cellsize 0 rlineto
            0 cellsize neg rlineto
            closepath
            fill
         } { pop } ifelse
      } for
   } for
} def

/dispPage {
   0 1 size 1 sub { /i exch def
      0 1 size 1 sub { /j exch def
         ar i j get2 dup 0 ne {
            0
            setgray
            newpath
            100 cellsize j mul add 500 cellsize i mul sub moveto
            0 cellsize rlineto
            cellsize 0 rlineto
            0 cellsize neg rlineto
            closepath
            fill
         } { pop } ifelse
      } for
   } for
   showpage
} def

/Wrap {
   size add size mod
} def

/DoGen {
   /diffs
   size {
      0 size 1 sub { dup } repeat
      size array astore
   } repeat
   size array astore
   def
   0 1 size 1 sub {
      /i exch def
      0 1 size 1 sub {
         /j exch def
         /neighbors 0 def
         -1 1 1  {
            /di exch def
            -1 1 1 {
               /dj exch def
               di 0 ne dj 0 ne or {
                  ar i di add Wrap j dj add Wrap get2 1 eq {
                     /neighbors neighbors 1 add def
                  } if
               } if
            } for
         } for
         ar i j get2 1 eq
         { neighbors 2 eq neighbors 3 eq or not {ar2 i j 0 put2 diffs i j 1 put2} if }
         { neighbors 3 eq  {ar2 i j 1 put2 diffs i j -1 put2} if }
         ifelse
      } for
   } for
   ar2 ar arcpy
} def

/setcell {
   1 3 copy ar 4 1 roll put2 diffs 4 1 roll put2
} def

size size mul 4 div cvi {
   rand size mod rand size mod setcell
} repeat

ar ar2 arcpy

disp
% numgens { disp DoGen } repeat
% disp
showpage