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maint: update copyright notices for 2012
author John W. Eaton <jwe@octave.org>
date Mon, 02 Jan 2012 14:25:41 -0500
parents eb0ce6ffefb0
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1 ## Copyright (C) 2005-2012 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 {Command} {} ishold
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21 ## @deftypefnx {Function File} {} ishold (@var{h})
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22 ## Return true if the next plot will be added to the current plot, or
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23 ## false if the plot device will be cleared before drawing the next plot.
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24 ##
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25 ## Optionally, operate on the graphics handle @var{h} rather than the current
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26 ## plot.
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27 ## @seealso{hold}
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28 ## @end deftypefn
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29
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30 function retval = ishold (h)
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31
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32 if (nargin == 0)
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33 fig = gcf ();
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34 ax = get (fig, "currentaxes");
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35 elseif (nargin == 1)
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36 if (ishandle (h))
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37 if (isfigure (h))
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38 ax = get (h, "currentaxes");
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39 fig = h;
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40 elseif (strcmpi (get (h, "type"), "axes"))
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41 ax = h;
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42 fig = get (h, "parent");
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43 else
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44 error ("ishold: expecting argument to be axes or figure graphics handle");
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45 endif
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46 else
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47 error ("ishold: expecting argument to be axes or figure graphics handle");
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48 endif
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49 else
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50 print_usage ();
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51 endif
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52
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53 retval = (strcmpi (get (fig, "nextplot"), "add")
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54 && ! isempty (ax) && strcmpi (get (ax, "nextplot"), "add"));
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55
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56 endfunction
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57
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58 %!test
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59 %! hf = figure ("visible", "off");
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60 %! unwind_protect
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61 %! assert (!ishold);
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62 %! assert (isempty (get (hf, "currentaxes")));
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63 %! assert (get (hf, "NextPlot"), "add");
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64 %! l = plot ([0 1]);
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65 %! assert (!ishold);
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66 %! assert (!ishold (gca));
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67 %! assert (get (gca, "NextPlot"), "replace");
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68 %! assert (get (hf, "NextPlot"), "add");
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69 %! hold;
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70 %! assert (ishold);
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71 %! assert (ishold (gca));
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72 %! assert (get (gca, "NextPlot"), "add");
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73 %! assert (get (hf, "NextPlot"), "add");
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74 %! p = fill ([0 1 1], [0 0 1],"black");
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75 %! assert (length (get (hf, "children")), 1);
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76 %! assert (length (get (gca, "children")), 2);
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77 %! unwind_protect_cleanup
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78 %! close (hf);
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79 %! end_unwind_protect