Mercurial > octave
view scripts/image/hot.m @ 21220:d78e45987d6a
rename octave::build_env namespace from octave::config
* build-env-features.sh: Rename from ocgt-conf-features.sh.
Update for new names.
* build-env.h: Rename from oct-conf.h. Also declare features function.
* build-env.in.cc: Rename from oct-conf.in.cc.
* oct-conf-features.h: Delete.
* libinterp/module.mk: Update.
* toplev.cc, __init_gnuplot__.cc, octave.cc: Update for new names.
author | John W. Eaton <jwe@octave.org> |
---|---|
date | Sun, 07 Feb 2016 14:56:17 -0500 |
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} =} hot () ## @deftypefnx {} {@var{map} =} hot (@var{n}) ## Create color colormap. This colormap ranges from black through dark red, ## red, orange, yellow, to white. ## ## 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", "hot"); ## PKG_DEL: colormap ("unregister", "hot"); function map = hot (n = rows (colormap ())) if (nargin > 1) print_usage (); elseif (! isscalar (n)) error ("hot: N must be a scalar"); endif if (n == 1) map = [1, 1, 1]; elseif (n == 2) map = [1, 1, 1/2 1, 1, 1 ]; elseif (n > 2) idx = floor (3/8 * n); nel = idx; r = ones (n, 1); r(1:idx, 1) = [1:nel]' / nel; g = zeros (n, 1); g(idx+1:2*idx, 1) = r(1:idx); g(2*idx+1:end, 1) = 1; idx = 2*idx + 1; # approximately 3/4 *n nel = n - idx + 1; b = zeros (n, 1); b(idx:end, 1) = [1:nel]' / nel; map = [r, g, b]; else map = zeros (0, 3); endif endfunction %!demo %! ## Show the 'hot' colormap profile and as an image %! cmap = hot (256); %! subplot (2, 1, 1); %! rgbplot (cmap, "composite"); %! subplot (2, 1, 2); %! rgbplot (cmap);