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comparison scripts/plot/private/__gnuplot_get_var__.m @ 12793:6f91ca83d2be

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codesprint : Make many plot helper functions private. * plot/module.mk : Update where to find files for Automake *__fltk_ginput__.m, __fltk_print__.m, __gnuplot_drawnow__.m, __gnuplot_get_var__.m, __gnuplot_ginput__.m, __gnuplot_has_feature__.m, __gnuplot_open_stream__.m, __gnuplot_print__.m, __gnuplot_version__.m, __go_draw_axes__.m, __go_draw_figure__.m, __marching_cube__.m, __next_line_color__.m, __next_line_style__.m, __print_parse_opts__.m: Move helper functions into plot/private/ directory.
author Rik <octave@nomad.inbox5.com>
date Sat, 16 Jul 2011 09:28:26 -0700
parents scripts/plot/__gnuplot_get_var__.m@d5bd2766c640
children 72c96de7a403
comparison
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12792:dc29b64668fa 12793:6f91ca83d2be
1 ## Copyright (C) 2009-2011 Ben Abbott
2 ##
3 ## This file is part of Octave.
4 ##
5 ## Octave is free software; you can redistribute it and/or modify it
6 ## under the terms of the GNU General Public License as published by
7 ## the Free Software Foundation; either version 3 of the License, or (at
8 ## your option) any later version.
9 ##
10 ## Octave is distributed in the hope that it will be useful, but
11 ## WITHOUT ANY WARRANTY; without even the implied warranty of
12 ## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 ## General Public License for more details.
14 ##
15 ## You should have received a copy of the GNU General Public License
16 ## along with Octave; see the file COPYING. If not, see
17 ## <http://www.gnu.org/licenses/>.
18
19 ## -*- texinfo -*-
20 ## @deftypefn {Function File} {@var{value} =} __gnuplot_get_var__ (@var{h}, @var{name}, @var{fmt})
21 ## Undocumented internal function.
22 ## @end deftypefn
23
24 ## Author: Ben Abbott <bpabbott@mac.com>
25 ## Created: 2009-02-07
26
27 function gp_var_value = __gnuplot_get_var__ (h, gp_var_name, fmt)
28
29 if (nargin == 0)
30 h = gcf ();
31 endif
32 if (nargin < 2)
33 print_usage ();
34 endif
35 if (nargin < 3)
36 fmt = '';
37 endif
38
39 if (numel (h) == 1 && isfigure (h))
40 if (isempty (get (gcf, "__plot_stream__")))
41 ostream = __gnuplot_open_stream__ (2, h);
42 else
43 ostream = get (h, "__plot_stream__");
44 endif
45 else
46 ostream = h;
47 endif
48 if (numel (ostream) < 1)
49 error ("__gnuplot_get_var__: stream to gnuplot not open");
50 elseif (ispc ())
51 if (numel (ostream) == 1)
52 error ("__gnuplot_get_var__: Need mkfifo that is not implemented under Windows");
53 endif
54 use_mkfifo = false;
55 istream = ostream(2);
56 ostream = ostream(1);
57 else
58 use_mkfifo = true;
59 ostream = ostream(1);
60 endif
61
62 if (use_mkfifo)
63 gpin_name = tmpnam ();
64
65 ## Mode: 6*8*8 == 0600
66 [err, msg] = mkfifo (gpin_name, 6*8*8);
67
68 if (err != 0)
69 error ("__gnuplot_get_var__: Can not make fifo (%s)", msg);
70 endif
71 endif
72
73 gp_var_name = strtrim (gp_var_name);
74 n = min (strfind (gp_var_name, " "), strfind (gp_var_name, ",")) - 1;
75 if (isempty (n))
76 n = numel (gp_var_name);
77 endif
78
79 unwind_protect
80
81 ## Notes: Variables may be undefined if user closes gnuplot by "q"
82 ## or Alt-F4. Further, this abrupt close also requires the leading
83 ## "\n" on the next line.
84 if (use_mkfifo)
85 fprintf (ostream, "\nset print \"%s\";\n", gpin_name);
86 fflush (ostream);
87 [gpin, err] = fopen (gpin_name, "r");
88 if (err != 0)
89 ## Try a second time, and then give an error.
90 [gpin, err] = fopen (gpin_name, "r");
91 endif
92 if (err != 0)
93 error ("__gnuplot_get_var__: can not open fifo");
94 endif
95 gp_cmd = sprintf ("\nif (exists(\"%s\")) print %s; else print NaN\n",
96 gp_var_name(1:n), gp_var_name);
97 fputs (ostream, gp_cmd);
98
99 ## Close output file, to force it to be flushed
100 fputs (ostream, "set print;\n");
101 fflush (ostream);
102
103 ## Now read from fifo.
104 reading = true;
105 str = {};
106 while (reading)
107 str{end+1} = fgets (gpin);
108 if (isnumeric (str{end}) && (str{end} == -1))
109 reading = false;
110 str = str(1:(end-1));
111 endif
112 endwhile
113 str = strcat (str{:});
114 fclose (gpin);
115 else
116 ## Direct gnuplot to print to <STDOUT>
117 fprintf (ostream, "set print \"-\";\n");
118 fflush (ostream);
119 gp_cmd = sprintf ("\nif (exists(\"%s\")) print \"OCTAVE: \", %s; else print NaN\n",
120 gp_var_name(1:n), gp_var_name);
121 fputs (ostream, gp_cmd);
122 fflush (ostream);
123 ## Direct gnuplot to print to <STDERR>
124 fputs (ostream, "set print;\n");
125 fflush (ostream);
126
127 str = {};
128 while (isempty (str))
129 str = char (fread (istream)');
130 if (isempty (str))
131 sleep (0.05);
132 else
133 str = regexp (str, 'OCTAVE:.*', "match");
134 str = str{end}(8:end);
135 endif
136 fclear (istream);
137 endwhile
138 endif
139
140 ## Strip out EOLs and the continuation character "|"
141 str(str=="\n") = "";
142 str(str=="\r") = "";
143 n_continue = strfind (str, " \\ ");
144 if (! isempty (n_continue))
145 str(n_continue+1) = "";
146 endif
147
148 if (isempty (fmt))
149 gp_var_value = strtrim (str);
150 else
151 gp_var_value = sscanf (str, fmt);
152 endif
153
154 unwind_protect_cleanup
155 if (use_mkfifo)
156 unlink (gpin_name);
157 endif
158 end_unwind_protect
159
160 endfunction
161