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1 ## Copyright (C) 2005 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 2, or (at your option) |
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8 ## 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, write to the Free |
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17 ## Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA |
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18 ## 02110-1301, USA. |
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19 |
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20 ## -*- texinfo -*- |
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21 ## @deftypefn {Function File} {} drawnow () |
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22 ## Display the current graphics. |
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23 ## @end deftypefn |
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24 |
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25 ## Author: jwe |
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26 |
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27 function drawnow (term, file) |
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28 |
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29 if (nargin == 2) |
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30 h = get (0, "currentfigure"); |
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31 if (h) |
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32 f = get (h); |
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33 plot_stream = []; |
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34 unwind_protect |
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35 plot_stream = open_gnuplot_stream ([], term, file); |
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36 __go_draw_figure__ (f, plot_stream); |
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37 unwind_protect_cleanup |
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38 if (! isempty (plot_stream)) |
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39 pclose (plot_stream); |
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40 endif |
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41 end_unwind_protect |
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42 else |
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43 error ("drawnow: nothing to draw"); |
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44 endif |
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45 elseif (nargin == 0) |
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46 for h = __go_figure_handles__ () |
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47 if (! (isnan (h) || h == 0)) |
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48 f = get (h); |
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49 plot_stream = f.__plot_stream__; |
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50 figure_is_visible = strcmp (f.visible, "on"); |
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51 if (figure_is_visible) |
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52 if (isempty (plot_stream)) |
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53 plot_stream = open_gnuplot_stream (h); |
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54 endif |
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55 __go_draw_figure__ (f, plot_stream); |
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56 elseif (! isempty (plot_stream)) |
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57 pclose (plot_stream); |
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58 set (h, "__plot_stream__", []); |
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59 endif |
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60 __request_drawnow__ (false); |
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61 endif |
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62 endfor |
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63 else |
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64 print_usage (); |
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65 endif |
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66 |
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67 __request_drawnow__ (false); |
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68 |
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69 endfunction |
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70 |
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71 function plot_stream = open_gnuplot_stream (h, term, file) |
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72 |
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73 ## If drawnow is cleared, it is possible to register __go_close_all__ |
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74 ## more than once, but that is not fatal. |
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75 persistent __go_close_all_registered__; |
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76 |
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77 cmd = gnuplot_binary (); |
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78 |
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79 if (! isempty (h) && gnuplot_use_title_option ()) |
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80 cmd = sprintf ("%s -title \"Figure %d\"", cmd, h); |
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81 endif |
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82 |
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83 plot_stream = popen (cmd, "w"); |
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84 |
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85 if (plot_stream < 0) |
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86 error ("drawnow: failed to open connection to gnuplot"); |
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87 else |
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88 |
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89 if (! isempty (h)) |
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90 set (h, "__plot_stream__", plot_stream); |
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91 endif |
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92 |
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93 if (nargin == 3) |
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94 fprintf (plot_stream, "set terminal %s\n;", term); |
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95 fprintf (plot_stream, "set output \"%s\"\n;", file); |
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96 elseif (isunix () && isempty (getenv ("DISPLAY"))) |
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97 fprintf (plot_stream, "set terminal dumb\n;"); |
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98 endif |
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99 |
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100 if (isempty (__go_close_all_registered__)) |
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101 atexit ("__go_close_all__"); |
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102 __go_close_all_registered__ = true; |
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103 endif |
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104 |
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105 endif |
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106 |
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107 endfunction |
