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1 ## Copyright (C) 2004, 2006, 2008 Petr Mikulik |
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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 ## This is ginput.m implementation for gnuplot and X11. |
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20 ## It requires gnuplot 4.1 and later. |
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21 |
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22 ## This file initially bore the copyright statement |
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23 ## Petr Mikulik |
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24 ## History: June 2006; August 2005; June 2004; April 2004 |
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25 ## License: public domain |
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26 |
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27 ## -*- texinfo -*- |
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28 ## @deftypefn {Function File} {[@var{x}, @var{y}, @var{buttons}] =} __gnuplot_ginput__ (@var{f}, @var{n}) |
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29 ## Undocumented internal function. |
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30 ## @end deftypefn |
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31 |
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32 function [x, y, button] = __gnuplot_ginput__ (f, n) |
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33 |
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34 stream = get (f, "__plot_stream__"); |
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35 |
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36 if (compare_versions (__gnuplot_version__ (), "4.0", "<=")) |
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37 error ("ginput: version %s of gnuplot not supported", gnuplot_version ()); |
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38 endif |
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39 |
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40 if (nargin == 0) |
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41 x = zeros (n, 1); |
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42 y = zeros (n, 1); |
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43 button = zeros (n, 1); |
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44 else |
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45 x = zeros (n, 1); |
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46 y = zeros (n, 1); |
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47 button = zeros (n, 1); |
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48 endif |
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49 |
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50 gpin_name = tmpnam (); |
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51 |
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52 ## 6*8*8 == 0600 |
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53 [err, msg] = mkfifo (gpin_name, 6*8*8); |
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54 if (err != 0) |
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55 error ("ginput: Can not open fifo (%s)", msg); |
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56 endif |
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57 |
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58 unwind_protect |
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59 |
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60 k = 0; |
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61 while (true) |
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62 k++; |
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63 fprintf (stream, "set print \"%s\";\n", gpin_name); |
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64 fflush (stream); |
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65 gpin = fopen (gpin_name, "r"); |
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66 fputs (stream, "pause mouse any;\n\n"); |
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67 |
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68 ## Notes: MOUSE_* can be undefined if user closes gnuplot by "q" |
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69 ## or Alt-F4. Further, this abrupt close also requires the leading |
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70 ## "\n" on the next line. |
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71 fputs (stream, "\nif (exists(\"MOUSE_KEY\") && exists(\"MOUSE_X\")) print MOUSE_X, MOUSE_Y, MOUSE_KEY; else print \"0 0 -1\"\n"); |
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72 |
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73 ## Close output file, otherwise all blocks (why?!). |
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74 fputs (stream, "set print;\n"); |
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75 fflush (stream); |
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76 |
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77 ## Now read from fifo. |
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78 [x(k), y(k), button(k), count] = fscanf (gpin, "%f %f %d", "C"); |
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79 fclose (gpin); |
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80 |
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81 if ([x(k), y(k), button(k)] == [0, 0, -1]) |
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82 ## Mousing not active (no plot yet). |
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83 break; |
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84 endif |
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85 |
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86 if (nargin > 0) |
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87 ## Input argument n was given => stop when k == n. |
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88 if (k == n) |
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89 break; |
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90 endif |
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91 else |
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92 ## Input argument n not given => stop when hitting a return key. |
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93 ## if (button(k) == 0x0D || button(k) == 0x0A) |
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94 ## ## hit Return or Enter |
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95 if (button(k) == 0x0D) |
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96 ## hit Return |
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97 x(k:end) = []; |
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98 y(k:end) = []; |
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99 button(k:end) = []; |
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100 break; |
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101 endif |
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102 endif |
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103 endwhile |
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104 |
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105 unwind_protect_cleanup |
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106 unlink (gpin_name); |
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107 end_unwind_protect |
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108 |
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109 endfunction |
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110 |
