annotate scripts/plot/gcf.m @ 19669:c2031ad6dbe7

Fix octave header includes in audiodevinfo * audiodevinfo.cc: change includes to use local octave headers
author Vytautas Jančauskas <unaudio@gmail.com>
date Wed, 11 Sep 2013 21:32:14 +0300
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Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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72c96de7a403 maint: update copyright notices for 2012
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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 {Function File} {@var{h} =} gcf ()
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21 ## Return a handle to the current figure.
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22 ##
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23 ## The current figure is the default target for graphics output. If multiple
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24 ## figures exist, @code{gcf} returns the last created figure or the last figure
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25 ## that was clicked on with the mouse.
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26 ##
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27 ## If a current figure does not exist, create one and return its handle. The
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28 ## handle may then be used to examine or set properties of the figure. For
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29 ## example,
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30 ##
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31 ## @example
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32 ## @group
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33 ## fplot (@@sin, [-10, 10]);
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34 ## fig = gcf ();
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35 ## set (fig, "numbertitle", "off", "name", "sin plot")
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36 ## @end group
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37 ## @end example
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38 ##
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39 ## @noindent
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40 ## plots a sine wave, finds the handle of the current figure, and then
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41 ## renames the figure window to describe the contents.
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42 ##
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43 ## Note: To find the current figure without creating a new one if it does not
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44 ## exist, query the @qcode{"CurrentFigure"} property of the root graphics
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45 ## object.
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46 ##
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47 ## @example
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48 ## get (0, "currentfigure");
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49 ## @end example
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50 ##
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51 ## @seealso{gca, gco, gcbf, gcbo, get, set}
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52 ## @end deftypefn
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53
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54 ## Author: jwe, Bill Denney
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55
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56 function h = gcf ()
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57
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58 if (nargin == 0)
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59 h = get (0, "currentfigure");
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60 if (isempty (h) || h == 0)
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61 ## We only have a root figure object, so create a new figure
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62 ## object and make it the current figure.
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63 h = figure ();
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64 endif
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65 else
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66 print_usage ();
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67 endif
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68
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69 endfunction
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71
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72 %!test
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73 %! hf = figure ("visible", "off");
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74 %! unwind_protect
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75 %! assert (gcf, hf);
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76 %! unwind_protect_cleanup
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77 %! close (hf);
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78 %! end_unwind_protect
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