Mercurial > octave
view scripts/image/prism.m @ 32737:d8e5e55c3cf5
Tighten input validation for all colormaps (bug #65011).
* autumn.m, bone.m, colorcube.m, cool.m, copper.m, cubehelix.m, flag.m, gray.m,
hot.m, hsv.m, jet.m, lines.m, movie.m, ocean.m, pink.m, prism.m, rainbow.m,
spring.m, summer.m, turbo.m, viridis.m, white.m, winter.m:
Check input N is scalar, real, and integer. Update BIST tests.
author | Rik <rik@octave.org> |
---|---|
date | Thu, 11 Jan 2024 22:06:54 -0800 |
parents | 8dfe116fb0fe |
children |
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######################################################################## ## ## Copyright (C) 1999-2024 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} =} 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 @var{n} is not specified the length of the current colormap is used. If ## there is no current colormap the default value of 256 is used. ## @seealso{colormap} ## @end deftypefn function map = prism (n) if (nargin == 1) if (! (isscalar (n) && isreal (n) && n == fix (n))) error ("prism: N must be a scalar integer"); endif n = double (n); else hf = get (0, "currentfigure"); if (! isempty (hf)) n = rows (get (hf, "colormap")); else n = 256; endif 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); %!assert (size (prism ()), [256, 3]) %!assert (size (prism (16)), [16, 3]) %!assert (prism (1), [1, 0, 0]) %!assert (prism (true), double ([1, 0, 0])) %!assert (prism (char (1)), double ([1, 0, 0])) %!assert (prism (int32 (1)), double ([1, 0, 0])) %!assert (prism (0), zeros (0, 3)) %!assert (prism (-1), zeros (0, 3)) %!test %! a = [1, 0, 0; 1, 1/2, 0; 1, 1, 0; 0, 1, 0; 0, 0, 1; 2/3, 0, 1]; %! nr = rows (a); %! assert (prism (3*nr), [a;a;a]); ## Input validation %!error <N must be a scalar integer> prism ("foo") %!error <N must be a scalar integer> prism ([1, 2, 3]) %!error <N must be a scalar integer> prism ({1, 2, 3})