Mercurial > octave
view scripts/image/rgbplot.m @ 27919:1891570abac8
update Octave Project Developers copyright for the new year
In files that have the "Octave Project Developers" copyright notice,
update for 2020.
author | John W. Eaton <jwe@octave.org> |
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date | Mon, 06 Jan 2020 22:29:51 -0500 |
parents | b442ec6dda5c |
children | bd51beb6205e |
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## Copyright (C) 2012-2020 The Octave Project Developers ## ## See the file COPYRIGHT.md in the top-level directory of this distribution ## or <https://octave.org/COPYRIGHT.html/>. ## ## ## 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 {} {} rgbplot (@var{cmap}) ## @deftypefnx {} {} rgbplot (@var{cmap}, @var{style}) ## @deftypefnx {} {@var{h} =} rgbplot (@dots{}) ## Plot the components of a colormap. ## ## Two different @var{style}s are available for displaying the @var{cmap}: ## ## @table @asis ## @item profile (default) ## Plot the RGB line profile of the colormap for each of the channels (red, ## green and blue) with the plot lines colored appropriately. Each line ## represents the intensity of an RGB component across the colormap. ## ## @item composite ## Draw the colormap across the X-axis so that the actual index colors are ## visible rather than the individual color components. ## ## @end table ## ## The optional return value @var{h} is a graphics handle to the created plot. ## ## Run @code{demo rgbplot} to see an example of @code{rgbplot} and each style ## option. ## @seealso{colormap} ## @end deftypefn function h = rgbplot (cmap, style = "profile") if (nargin < 1 || nargin > 2) print_usage (); endif if (! iscolormap (cmap)) error ("rgbplot: CMAP must be a valid colormap"); elseif (! ischar (style)) error ("rgbplot: STYLE must be a string"); endif switch (tolower (style)) case "profile" x = 1:rows (cmap); htmp = plot (x,cmap(:,1),"r", x,cmap(:,2),"g", x,cmap(:,3),"b"); set (gca, "ytick", 0:0.1:1, "xlim", [0 rows(cmap)]); case "composite" htmp = image (1:rows (cmap)); set (gca, "ytick", []); colormap (cmap); otherwise error ("rgbplot: unknown STYLE '%s'", style); endswitch xlabel ("color index"); if (nargout > 0) h = htmp; endif endfunction %!demo %! clf; %! subplot (1, 2, 1); %! rgbplot (ocean, "profile"); %! subplot (1, 2, 2); %! rgbplot (ocean, "composite"); ## Test input validation %!error rgbplot () %!error rgbplot (1,2) %!error <CMAP must be a valid colormap> rgbplot ({0 1 0}) %!error <STYLE must be a string> rgbplot ([0 1 0], 2) %!error <unknown STYLE 'nostyle'> rgbplot ([0 1 0], "nostyle")