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% STK_LEGEND create a legend automatically
%
% CALL: stk_legend ()
%
% creates a legend automatically, using only the graphical objcts for which a
% non-empty DisplayName has been provided.
%
% CALL: h = stk_legend ()
%
% also return a handle to the legend (which is either a numerical handle or a
% Legend object, depending on the version of Matlab/Octave that you are
% using).
%
% NOTE:
%
% Creating and displaying a legend is painfully slow in some versions of M/O.
% You should *really* avoid doing that inside a loop if you want a reasonably
% fast update of the display.
%
% See also: stk_plot1d
% Copyright Notice
%
% Copyright (C) 2018 CentraleSupelec
%
% Author: Julien Bect <julien.bect@centralesupelec.fr>
% Copying Permission Statement
%
% This file is part of
%
% STK: a Small (Matlab/Octave) Toolbox for Kriging
% (https://github.com/stk-kriging/stk/)
%
% STK 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.
%
% STK 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 STK. If not, see <http://www.gnu.org/licenses/>.
function h_legend = stk_legend ()
h_list = get (gca (), 'Children');
s_list = cell (size (h_list));
for i = 1:(length (h_list))
s_list{i} = get (h_list(i), 'DisplayName');
end
b = ~ (strcmp (s_list, ''));
h_list = h_list(b);
s_list = s_list(b);
h_legend = legend (h_list, s_list);
set (h_legend, 'Color', 0.98 * [1 1 1]);
end % function
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