Mercurial > octave-nkf
view scripts/image/hsv.m @ 19647:e8e3a89fa370
Fix colormap functions when N is not of class double (bug #44070)
* autumn.m, bone.m, cool.m, copper.m, cubehelix.m, gray.m, hsv.m, ocean.m,
rainbow.m, spring.m, summer.m, winter.m: cast N to double since in this
colormap functions, N is used directly used in the operations and ends up
casting colormap to something else. Note that a colormap MUST be of class
double. Also, if N is an integer class, all values in colormap end up 0
or 1. Also simplify code for input checking by declaring default on function
signature line.
* flag.m, gmap40.m, hot.m, jet.m, lines.m, pink.m, prism.m, white.m: simplify
input check like the other colormap functions.
* test/colormaps.tst: add new test file to test all colormaps at once.
* test/Makefile.am: add new test file to build system.
used to create the colormap and if less
author | Carnë Draug <carandraug@octave.org> |
---|---|
date | Fri, 23 Jan 2015 15:37:56 +0000 |
parents | d63878346099 |
children | 4197fc428c7d |
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## Copyright (C) 1999-2013 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 {Function File} {} hsv (@var{n}) ## Create color colormap. This colormap begins with red, changes through ## yellow, green, cyan, blue, and magenta, before returning to red. ## It is useful for displaying periodic functions. The map is obtained by ## linearly varying the hue through all possible values while keeping constant ## maximum saturation and value. The equivalent code is ## @code{hsv2rgb ([(0:N-1)'/N, ones(N,2)])}. ## ## 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", "hsv"); ## PKG_DEL: colormap ("unregister", "hsv"); function map = hsv (n = rows (colormap ())) if (nargin > 1) print_usage (); elseif (! isscalar (n)) error ("hsv: N must be a scalar"); endif n = double (n); if (n == 1) map = [1, 0, 0]; elseif (n > 1) hue = [0:n-1]' / n; map = hsv2rgb ([hue, ones(n,1), ones(n,1)]); else map = zeros (0, 3); endif endfunction %!demo %! ## Show the 'hsv' colormap as an image %! image (1:64, linspace (0, 1, 64), repmat ((1:64)', 1, 64)); %! axis ([1, 64, 0, 1], "ticy", "xy"); %! colormap (hsv (64));