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maint: Update copyright dates in all source files.
author John W. Eaton <jwe@octave.org>
date Wed, 02 Jan 2019 16:32:43 -0500
parents 6652d3823428
children b442ec6dda5c
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John W. Eaton <jwe@octave.org>
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1 ## Copyright (C) 2005-2019 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
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8 ## (at 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
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13 ## GNU 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 ## <https://www.gnu.org/licenses/>.
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18
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19 ## -*- texinfo -*-
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20 ## @deftypefn {} {} ishold
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21 ## @deftypefnx {} {} ishold (@var{hax})
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22 ## @deftypefnx {} {} ishold (@var{hfig})
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23 ## Return true if the next plot will be added to the current plot, or
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24 ## false if the plot device will be cleared before drawing the next plot.
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25 ##
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26 ## If the first argument is an axes handle @var{hax} or figure handle
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27 ## @var{hfig} then operate on this plot rather than the current one.
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28 ## @seealso{hold, newplot}
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29 ## @end deftypefn
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30
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31 function retval = ishold (h)
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32
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33 if (nargin > 1)
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34 print_usage ();
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35 endif
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36
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37 if (nargin == 0)
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38 fig = gcf ();
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39 ax = get (fig, "currentaxes");
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40 else
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41 if (! ishghandle (h))
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42 error ("ishold: H must be an axes or figure graphics handle");
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43 endif
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44
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45 switch (get (h, "type"))
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46 case "figure"
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47 fig = h;
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48 ax = get (fig, "currentaxes");
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49
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50 case "axes"
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51 ax = h;
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52 fig = ancestor (ax, "figure");
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53
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54 otherwise
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55 error ("ishold: H must be an axes or figure graphics handle");
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56
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57 endswitch
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58 endif
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59
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60 retval = (strcmp (get (fig, "nextplot"), "add")
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61 && ! isempty (ax) && strcmp (get (ax, "nextplot"), "add"));
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62
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63 endfunction
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64
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65
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66 %!test
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67 %! hf = figure ("visible", "off");
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68 %! unwind_protect
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69 %! assert (! ishold);
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70 %! assert (isempty (get (hf, "currentaxes")));
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71 %! assert (get (hf, "NextPlot"), "add");
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72 %! l = plot ([0 1]);
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73 %! assert (! ishold);
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74 %! assert (! ishold (gca));
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75 %! assert (get (gca, "NextPlot"), "replace");
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76 %! assert (get (hf, "NextPlot"), "add");
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77 %! hold;
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78 %! assert (ishold);
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79 %! assert (ishold (gca));
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80 %! assert (get (gca, "NextPlot"), "add");
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81 %! assert (get (hf, "NextPlot"), "add");
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82 %! p = fill ([0 1 1], [0 0 1],"black");
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83 %! assert (length (get (hf, "children")), 1);
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84 %! assert (length (get (gca, "children")), 2);
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85 %! unwind_protect_cleanup
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86 %! close (hf);
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87 %! end_unwind_protect