Mercurial > octave
view scripts/image/colormap.m @ 22543:b9f5ac691e03
colormap.m: Emit clearer error when map name does not exist (bug #49202).
* colormap.m: Use try/catch block to 'feval (map)'. If map does not exist then
issue a clear error mesage in catch block. Add %!error test to validate new
behavior.
author | Rik <rik@octave.org> |
---|---|
date | Tue, 27 Sep 2016 16:24:24 -0700 |
parents | bac0d6f07a3e |
children | a918e983a943 |
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## Copyright (C) 1994-2016 John W. Eaton ## Copyright (C) 2012 Carnë Draug ## ## 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{cmap} =} colormap () ## @deftypefnx {} {@var{cmap} =} colormap (@var{map}) ## @deftypefnx {} {@var{cmap} =} colormap (@qcode{"default"}) ## @deftypefnx {} {@var{cmap} =} colormap (@var{map_name}) ## @deftypefnx {} {@var{cmap} =} colormap (@var{hax}, @dots{}) ## @deftypefnx {} {} colormap @var{map_name} ## Query or set the current colormap. ## ## With no input arguments, @code{colormap} returns the current color map. ## ## @code{colormap (@var{map})} sets the current colormap to @var{map}. The ## colormap should be an @var{n} row by 3 column matrix. The columns ## contain red, green, and blue intensities respectively. All entries ## must be between 0 and 1 inclusive. The new colormap is returned. ## ## @code{colormap (@qcode{"default"})} restores the default colormap (the ## @code{viridis} map with 64 entries). The default colormap is returned. ## ## The map may also be specified by a string, @var{map_name}, which ## is the name of a function that returns a colormap. ## ## If the first argument @var{hax} is an axes handle, then the colormap for ## the parent figure of @var{hax} is queried or set. ## ## For convenience, it is also possible to use this function with the ## command form, @code{colormap @var{map_name}}. ## ## @seealso{viridis} ## @end deftypefn ## Author: Tony Richardson <arichard@stark.cc.oh.us> ## Created: July 1994 ## Adapted-By: jwe function cmap = colormap (varargin) [hax, varargin, nargin] = __plt_get_axis_arg__ ("colormap", varargin{:}); if (nargin > 1) print_usage (); endif if (! isempty (hax)) cf = ancestor (hax, "figure"); else cf = get (0, "currentfigure"); endif if (nargin == 1) map = varargin{1}; if (ischar (map)) if (strcmp (map, "default")) map = viridis (64); else try map = feval (map); catch error ("colormap: failed to set MAP <%s>", map); end_try_catch endif endif if (! isempty (map)) if (! (isnumeric (map) && isreal (map) && ndims (map) == 2 && columns (map) == 3)) error ("colormap: MAP must be a real-valued N x 3 ([R,G,B]) matrix"); endif if (any (map(:) < 0) || any (map(:) > 1)) error ("colormap: all MAP values must be in the range [0,1]"); endif if (isempty (cf)) cf = gcf (); endif ## Set the new color map set (cf, "colormap", map); endif endif ## Return current color map. if (nargout > 0 || nargin == 0) if (isempty (cf)) cf = gcf (); endif cmap = get (cf, "colormap"); endif endfunction %!demo %! ## Create an image for displaying a colormap %! image (1:64, linspace (0, 1, 64), repmat ((1:64)', 1, 64)); %! axis ([1, 64, 0, 1], "ticy", "xy"); %! ## Show 'viridis' colormap %! colormap (viridis (64)); %! title "colormap (viridis (64))" %! disp ("Press a key to continue"); %! pause (); %! ## Show 'colorcube' colormap %! colormap (colorcube (64)); %! title "colormap (colorcube (64))" %!test %! hf = figure ("visible", "off"); %! unwind_protect %! cmaptst = [0 1 0; 1 0 1; 1 1 1]; %! cmap = colormap (cmaptst); %! assert (cmap, cmaptst); %! cmap = colormap (); %! assert (cmap, cmaptst); %! cmap = (get (gcf, "colormap")); %! assert (cmap, cmaptst); %! colormap ("default"); %! assert (colormap (), viridis (64)); %! colormap ("ocean"); %! assert (colormap, ocean (64)); %! unwind_protect_cleanup %! close (hf); %! end_unwind_protect ## Test input validation %!error colormap (1,2,3) %!error <MAP must be a real-valued N x 3> colormap ({1,2,3}) %!error <MAP must be a real-valued N x 3> colormap ([1 i 1]) %!error <MAP must be a real-valued N x 3> colormap (ones(3,3,3)) %!error <MAP must be a real-valued N x 3> colormap ([1 0 1 0]) %!error <all MAP values must be in the range> colormap ([-1 0 0]) %!error <all MAP values must be in the range> colormap ([2 0 0]) %!error <failed to set MAP .invalid_map_name.> colormap ("invalid_map_name")