Mercurial > octave
view scripts/image/flag.m @ 21567:3d25f9f4a62b
maint: Eliminate Britishicisms in the code.
* oct-stream.cc, __magick_read__.cc, Array.h, flag.m, lines.m, prism.m,
__contour__.m: Use 'optimize' and 'color' rather than British spellings.
author | Rik <rik@octave.org> |
---|---|
date | Wed, 30 Mar 2016 21:35:51 -0700 |
parents | 516bb87ea72e |
children | 894239974868 |
line wrap: on
line source
## Copyright (C) 1999-2015 Kai Habel ## ## 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 {} {@var{map} =} flag () ## @deftypefnx {} {@var{map} =} flag (@var{n}) ## Create color colormap. This colormap cycles through red, white, blue, and ## black with each index change. ## ## The argument @var{n} must be a scalar. ## If unspecified, the length of the current colormap, or 64, is used. ## @seealso{colormap} ## @end deftypefn ## Author: Kai Habel <kai.habel@gmx.de> ## PKG_ADD: colormap ("register", "flag"); ## PKG_DEL: colormap ("unregister", "flag"); function map = flag (n = rows (colormap ())) if (nargin > 1) print_usage (); elseif (! isscalar (n)) error ("flag: N must be a scalar"); endif if (n == 1) map = [1, 0, 0]; elseif (n > 1) C = [1, 0, 0; 1, 1, 1; 0, 0, 1; 0, 0, 0]; map = C(rem (0:(n-1), 4) + 1, :); else map = zeros (0, 3); endif endfunction %!demo %! ## Show the 'flag' colormap profile and as an image %! cmap = flag (12); # 4 colors, therefore cycle 3 times %! subplot (2, 1, 1); %! rgbplot (cmap, "composite"); %! subplot (2, 1, 2); %! rgbplot (cmap);