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−## Copyright (C) 2008-2012 David Bateman
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−##
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−## This file is part of Octave.
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−##
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−## Octave is free software; you can redistribute it and/or modify it
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−## under the terms of the GNU General Public License as published by
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−## the Free Software Foundation; either version 3 of the License, or (at
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−## your option) any later version.
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−##
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−## Octave is distributed in the hope that it will be useful, but
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−## WITHOUT ANY WARRANTY; without even the implied warranty of
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−## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
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−## General Public License for more details.
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−##
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−## You should have received a copy of the GNU General Public License
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−## along with Octave; see the file COPYING.  If not, see
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−## <http://www.gnu.org/licenses/>.
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−
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−## -*- texinfo -*-
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−## @deftypefn  {Function File} {} refreshdata ()
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−## @deftypefnx {Function File} {} refreshdata (@var{h})
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−## @deftypefnx {Function File} {} refreshdata (@var{h}, @var{workspace})
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−## Evaluate any @samp{datasource} properties of the current figure and update
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−## the plot if the corresponding data has changed.  If called with one or more
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−## arguments @var{h} is a scalar or array of figure handles to refresh.  The
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−## optional second argument @var{workspace} can take the following values.
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−##
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−## @table @asis
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−## @item "base"
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−## Evaluate the datasource properties in the base workspace.  (default).
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−##
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−## @item "caller"
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−## Evaluate the datasource properties in the workspace of the function
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−## that called @code{refreshdata}.
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−## @end table
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−##
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−## An example of the use of @code{refreshdata} is:
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−##
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−## @example
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−## @group
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−## x = 0:0.1:10;
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−## y = sin (x);
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−## plot (x, y, "ydatasource", "y");
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−## for i = 1 : 100
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−##   pause (0.1);
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−##   y = sin (x + 0.1*i);
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−##   refreshdata ();
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−## endfor
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−## @end group
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−## @end example
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−## @end deftypefn
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−
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−function refreshdata (h, workspace)
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−
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−  if (nargin == 0)
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−    h = gcf ();
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−    workspace = "base";
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−  else
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−    if (iscell (h))
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−      h = [h{:}];
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−    endif
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−    if (!all (ishandle (h)) || !all (strcmp (get (h, "type"), "figure")))
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−      error ("refreshdata: expecting a list of figure handles");
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−    endif
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−    if (nargin < 2)
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−      workspace = "base";
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−    else
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−      if (   !ischar (workspace)
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−          || !(strcmpi (workspace, "base")
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−          || strcmpi (workspace, "caller")))
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−        error ("refreshdata: expecting WORKSPACE to be \"base\" or ""caller\"");
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−      else
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−        workspace = tolower (workspace);
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−      endif
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−    endif
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−  endif
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−
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−  h = findall (h);
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−  objs = [];
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−  props = {};
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−
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−  for i = 1 : numel (h)
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−    obj = get (h (i));
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−    fldnames = fieldnames (obj);
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−    m = regexpi (fieldnames (obj), '^.+datasource$', "match");
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−    idx = ! cellfun ("isempty", m);
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−    if (any (idx))
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−      tmp = m(idx);
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−      props = [props; {vertcat(tmp{:})}];
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−      objs  = [objs ; h(i)];
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−    endif
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−  endfor
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−
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−  for i = 1 : length (objs)
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−    for j = 1 : length (props {i})
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−      expr = get (objs(i), props{i}{j});
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−      if (!isempty (expr))
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−        val = evalin (workspace, expr);
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−        prop =  props{i}{j}(1:end-6);
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−        if (! isequal (get (objs(i), prop), val))
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−          set (objs(i), props{i}{j}(1:end-6), val);
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−        endif
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−      endif
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−    endfor
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−  endfor
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−
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−endfunction
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−
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−
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−%!demo
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−%! clf;
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−%! x = 0:0.1:10;
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−%! y = sin (x);
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−%! plot (x, y, 'ydatasource', 'y');
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−%! for i = 1 : 100
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−%!   pause (0.1);
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−%!   y = sin (x + 0.1 * i);
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−%!   refreshdata (gcf, 'caller');
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−%! end
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−