Mercurial > octave
view scripts/image/prism.m @ 21973:894239974868
colormap: remove functionality to list and register colormaps (bug #48272)
* colormap.m: remove the unused functionality which clashes with the
possibility of having a colormap named list. It's also not that useful
since there's no requirement to register a colormap, and therefore no
guarantees that the list is complete.
* autumn.m, bone.m, cool.m, copper.m, cubehelix.m, flag.m, gray.m,
hot.m, hsv.m, jet.m, lines.m, ocean.m, pink.m, prism.m, rainbow.m,
spring.m, summer.m, viridis.m, white.m, winter.m: remove registration
to colormap().
author | Carnë Draug <carandraug@octave.org> |
---|---|
date | Mon, 20 Jun 2016 18:24:18 +0100 |
parents | 3d25f9f4a62b |
children | 1c4cd12987f5 |
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## 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} =} prism () ## @deftypefnx {} {@var{map} =} prism (@var{n}) ## Create color colormap. This colormap cycles through red, orange, yellow, ## green, blue and violet 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> function map = prism (n = rows (colormap ())) if (nargin > 1) print_usage (); elseif (! isscalar (n)) error ("prism: N must be a scalar"); endif if (n == 1) map = [1 0 0]; elseif (n > 1) C = [1, 0, 0; 1, 1/2, 0; 1, 1, 0; 0, 1, 0; 0, 0, 1; 2/3, 0, 1]; map = C(rem (0:(n-1), 6) + 1, :); else map = zeros (0, 3); endif endfunction %!demo %! ## Show the 'prism' colormap profile and as an image %! cmap = prism (18); # 6 colors, therefore cycle 3 times %! subplot (2, 1, 1); %! rgbplot (cmap, "composite"); %! subplot (2, 1, 2); %! rgbplot (cmap);