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## Copyright (C) 2010 VZLU Prague, a.s.
##
## 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 3 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, see <http://www.gnu.org/licenses/>.
## -*- texinfo -*-
## @deftypefn{Function File} {B =} gameoflife (A, ngen, delay)
## Runs the Conways' game of life from a given initial state for a given
## number of generations and visualizes the process.
## If ngen is infinity, the process is run as long as A changes.
## Delay sets the pause between two frames. If zero, visualization is not done.
## @end deftypefn
function B = gameoflife (A, ngen, delay = 0.2)
B = A != 0;
igen = 0;
CSI = char ([27, 91]);
oldpso = page_screen_output (delay != 0);
unwind_protect
if (delay > 0)
puts (["\n", CSI, "s"]);
printf ("generation 0\n");
colorboard (! B);
pause (delay);
endif
while (igen < ngen)
C = conv2 (B, ones (3), "same") - B;
B1 = C == 3 | (B & C == 2);
igen++;
if (isinf (ngen) && all ((B1 == B)(:)))
break;
endif
B = B1;
if (delay > 0)
puts (["\n", CSI, "u"]);
printf ("generation %d\n", igen);
colorboard (! B);
pause (delay);
endif
endwhile
unwind_protect_cleanup
page_screen_output (oldpso);
end_unwind_protect
endfunction
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