Mercurial > octave
view scripts/image/copper.m @ 31215:5573b1d511c9
maint: Merge stable to default.
author | Markus Mützel <markus.muetzel@gmx.de> |
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date | Tue, 30 Aug 2022 11:16:55 +0200 |
parents | 796f54d4ddbf |
children | 597f3ee61a48 |
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######################################################################## ## ## Copyright (C) 1999-2022 The Octave Project Developers ## ## See the file COPYRIGHT.md in the top-level directory of this ## distribution or <https://octave.org/copyright/>. ## ## 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 ## <https://www.gnu.org/licenses/>. ## ######################################################################## ## -*- texinfo -*- ## @deftypefn {} {@var{map} =} copper () ## @deftypefnx {} {@var{map} =} copper (@var{n}) ## Create color colormap. This colormap varies from black to a light copper ## tone. ## ## The argument @var{n} must be a scalar. ## If unspecified, the length of the current colormap, or 64, is used. ## @seealso{colormap} ## @end deftypefn function map = copper (n) if (nargin == 1) if (! isscalar (n)) error ("copper: N must be a scalar"); endif n = double (n); else hf = get (0, "currentfigure"); if (! isempty (hf)) n = rows (get (hf, "colormap")); else n = 64; endif endif if (n == 1) map = [0, 0, 0]; elseif (n > 1) x = [0:(n-1)]' / (n - 1); r = (x < 4/5) .* (5/4 * x) ... + (x >= 4/5); g = 0.7812 * x; b = 0.4975 * x; map = [r, g, b]; else map = zeros (0, 3); endif endfunction %!demo %! ## Show the 'copper' colormap profile and as an image %! cmap = copper (256); %! subplot (2, 1, 1); %! rgbplot (cmap, "composite"); %! subplot (2, 1, 2); %! rgbplot (cmap);