--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/main/image/flag.m	Wed Oct 10 19:54:49 2001 +0000
@@ -0,0 +1,56 @@
+## Copyright (C) 1999,2000  Kai Habel
+##
+## 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
+
+## -*- texinfo -*-
+## @deftypefn {Function File} {} flag (@var{n})
+## Create color colormap. 
+## (cycling through red, white, blue and black)
+## The argument @var{n} should be a scalar.  If it
+## is omitted, the length of the current colormap or 64 is assumed.
+## @end deftypefn
+## @seealso{colormap}
+
+## Author:  Kai Habel <kai.habel@gmx.de>
+
+## flag(number) gives a colormap consists of red, white, blue and black
+## changing with each index
+
+function map = flag (number)
+
+  global __current_color_map__
+
+  if (nargin == 0)
+    if exist ("__current_color_map__")
+      number = rows (__current_color_map__);
+    else
+      number = 64;
+    endif
+  elseif (nargin == 1)
+    if (! is_scalar (number))
+      error ("flag: argument must be a scalar");
+    endif
+  else
+    usage ("flag (number)");
+  endif
+
+  p = [1, 0, 0; 1, 1, 1; 0, 0, 1; 0, 0, 0];
+  if (rem(number,4) == 0)
+    map=kron (ones (number / 4, 1), p);
+  else
+    map=[kron(ones (fix (number / 4), 1), p); p(1:rem (number, 4), :)];
+  endif
+
+endfunction