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[CreaPhase.git] / octave_packages / m / image / gmap40.m

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+## Copyright (C) 2007-2012 David Bateman
+##
+## This file is part of Octave.
+##
+## Octave 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.
+##
+## Octave 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 Octave; see the file COPYING.  If not, see
+## <http://www.gnu.org/licenses/>.
+
+## -*- texinfo -*-
+## @deftypefn  {Function File} {@var{map} =} gmap40 ()
+## @deftypefnx {Function File} {@var{map} =} gmap40 (@var{n})
+## Create color colormap.  The colormap consists of red, green, blue, yellow,
+## magenta and cyan.  This colormap is specifically designed for users of
+## gnuplot 4.0 where these 6 colors are the allowable ones for patch objects.
+## The argument @var{n} must be a scalar.
+## If unspecified, a length of 6 is assumed.  Larger values
+## of @var{n} result in a repetition of the above colors.
+## @seealso{colormap}
+## @end deftypefn
+
+function map = gmap40 (n)
+
+  if (nargin == 0)
+    n = 6;
+  elseif (nargin == 1)
+    if (! isscalar (n))
+      error ("gmap40: argument must be a scalar");
+    endif
+  else
+    print_usage ();
+  endif
+
+  if (n >= 1)
+    map = repmat ([1, 0, 0; 0, 1, 0; 0, 0, 1; 1, 1, 0; 1, 0, 1; 0, 1, 1],
+          ceil (n / 6), 1) (1:n, :);
+  else
+    map = [];
+  endif
+
+endfunction
+
+%!demo
+%! ## Show the 'gmap40' colormap as an image
+%! image (1:6, linspace (0, 1, 6), repmat (1:6, 6, 1)')
+%! axis ([1, 6, 0, 1], "ticy", "xy")
+%! colormap (gmap40 (6))
+