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annotate scripts/plot/ishold.m @ 9618:e381f80a5f7a

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correctly toggle hold state
author John W. Eaton <jwe@octave.org>
date Sat, 05 Sep 2009 16:50:21 -0400
parents eb63fbe60fab
children 95c3e38098bf
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9618
e381f80a5f7a correctly toggle hold state
John W. Eaton <jwe@octave.org>
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1 ## Copyright (C) 2005, 2006, 2007, 2008 2009 John W. Eaton
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2 ##
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3 ## This file is part of Octave.
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4 ##
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5 ## Octave is free software; you can redistribute it and/or modify it
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6 ## under the terms of the GNU General Public License as published by
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7 ## the Free Software Foundation; either version 3 of the License, or (at
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8 ## your option) any later version.
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9 ##
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10 ## Octave is distributed in the hope that it will be useful, but
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11 ## WITHOUT ANY WARRANTY; without even the implied warranty of
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12 ## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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13 ## General Public License for more details.
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14 ##
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15 ## You should have received a copy of the GNU General Public License
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16 ## along with Octave; see the file COPYING. If not, see
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17 ## <http://www.gnu.org/licenses/>.
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18
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19 ## -*- texinfo -*-
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20 ## @deftypefn {Function File} {} ishold
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21 ## Return true if the next line will be added to the current plot, or
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22 ## false if the plot device will be cleared before drawing the next line.
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23 ## @end deftypefn
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24
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25 function retval = ishold (h)
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26
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27 if (nargin == 0)
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28 ax = gca ();
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29 fig = gcf ();
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30 elseif (nargin == 1)
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31 if (ishandle (h))
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32 if (isfigure (h))
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33 ax = get (h, "currentaxes");
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34 if (isempty (ax))
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35 ax = __go_axes__ (h);
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36 set (h, "currentaxes", ax);
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37 endif
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38 fig = h;
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39 elseif (strcmpi (get (h, "type"), "axes"))
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40 ax = h;
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41 fig = get (h, "parent");
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42 else
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43 error ("hold: expecting argument to be axes or figure graphics handle");
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44 endif
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45 else
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46 error ("hold: expecting argument to be axes or figure graphics handle");
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47 endif
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48 else
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49 print_usage ();
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50 endif
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51
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52 retval = (strcmpi (get (fig, "nextplot"), "add")
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53 && strcmpi (get (ax, "nextplot"), "add"));
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54
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55 endfunction