update packages

[CreaPhase.git] / octave_packages / m / plot / private / __gnuplot_ginput__.m

diff --git a/octave_packages/m/plot/private/__gnuplot_ginput__.m b/octave_packages/m/plot/private/__gnuplot_ginput__.m
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+++ b/octave_packages/m/plot/private/__gnuplot_ginput__.m
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+## Copyright (C) 2004-2012 Petr Mikulik
+##
+## This file is part of Octave.
+##
+## Octave is free software; you can redistribute it and/or modify it
+## under the terms of the GNU General Public License as published by
+## the Free Software Foundation; either version 3 of the License, or (at
+## your option) any later version.
+##
+## Octave is distributed in the hope that it will be useful, but
+## WITHOUT ANY WARRANTY; without even the implied warranty of
+## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+## General Public License for more details.
+##
+## You should have received a copy of the GNU General Public License
+## along with Octave; see the file COPYING.  If not, see
+## <http://www.gnu.org/licenses/>.
+
+## -*- texinfo -*-
+## @deftypefn {Function File} {[@var{x}, @var{y}, @var{buttons}] =} __gnuplot_ginput__ (@var{f}, @var{n})
+## Undocumented internal function.
+## @end deftypefn
+
+## This is ginput.m implementation for gnuplot and X11.
+## It requires gnuplot 4.1 and later.
+
+## This file initially bore the copyright statement
+## Petr Mikulik
+## History: June 2006; August 2005; June 2004; April 2004
+## License: public domain
+
+function [x, y, button] = __gnuplot_ginput__ (f, n)
+
+  ostream = get (f, "__plot_stream__");
+  if (numel (ostream) < 1)
+    error ("ginput: stream to gnuplot not open");
+  elseif (ispc ())
+    if (numel (ostream) == 1)
+      error ("ginput: Need mkfifo that is not implemented under Windows");
+    endif
+    use_mkfifo = false;
+    istream = ostream(2);
+    ostream = ostream(1);
+  else
+    use_mkfifo = true;
+    ostream = ostream(1);
+  endif
+
+  if (compare_versions (__gnuplot_version__ (), "4.0", "<="))
+    error ("ginput: version %s of gnuplot not supported", gnuplot_version ());
+  endif
+
+  if (nargin == 1)
+    x = zeros (100, 1);
+    y = zeros (100, 1);
+    button = zeros (100, 1);
+  else
+    x = zeros (n, 1);
+    y = zeros (n, 1);
+    button = zeros (n, 1);
+  endif
+
+  if (use_mkfifo)
+    gpin_name = tmpnam ();
+
+    ##Mode: 6*8*8 ==  0600
+    [err, msg] = mkfifo (gpin_name, 6*8*8);
+
+    if (err != 0)
+      error ("ginput: Can not open fifo (%s)", msg);
+    endif
+  endif
+
+  unwind_protect
+
+    k = 0;
+    while (true)
+      k++;
+
+      ## Notes: MOUSE_* can be undefined if user closes gnuplot by "q"
+      ## or Alt-F4. Further, this abrupt close also requires the leading
+      ## "\n" on the next line.
+      if (use_mkfifo)
+        fprintf (ostream, "set print \"%s\";\n", gpin_name);
+        fflush (ostream);
+        [gpin, err] = fopen (gpin_name, "r");
+        if (err != 0)
+          error ("ginput: Can not open fifo (%s)", msg);
+        endif
+        fputs (ostream, "pause mouse any;\n\n");
+        fputs (ostream, "\nif (exists(\"MOUSE_KEY\") && exists(\"MOUSE_X\")) print MOUSE_X, MOUSE_Y, MOUSE_KEY; else print \"0 0 -1\"\n");
+
+        ## Close output file, to force it to be flushed
+        fputs (ostream, "set print;\n");
+        fflush (ostream);
+
+        ## Now read from fifo.
+        [x(k), y(k), button(k), count] = fscanf (gpin, "%f %f %d", "C");
+        fclose (gpin);
+      else
+        fprintf (ostream, "set print \"-\";\n");
+        fflush (ostream);
+        fputs (ostream, "pause mouse any;\n\n");
+        fputs (ostream, "\nif (exists(\"MOUSE_KEY\") && exists(\"MOUSE_X\")) print \"OCTAVE: \", MOUSE_X, MOUSE_Y, MOUSE_KEY; else print \"0 0 -1\"\n");
+
+        ## Close output file, to force it to be flushed
+        fputs (ostream, "set print;\n");
+        fflush (ostream);
+
+        str = {};
+        while (isempty (str))
+          str = char (fread (istream)');
+          if (isempty (str))
+            sleep (0.05);
+          else
+            str = regexp (str, 'OCTAVE:\s+[-+.\d]+\s+[-+.\d]+\s+\d*', 'match');
+          endif
+          fclear (istream);
+        endwhile
+        [x(k), y(k), button(k), count] = sscanf (str{end}(8:end), "%f %f %d", "C");
+      endif
+
+      if ([x(k), y(k), button(k)] == [0, 0, -1])
+        ## Mousing not active (no plot yet).
+        break;
+      endif
+
+      if (nargin > 1)
+        ## Input argument n was given => stop when k == n.
+        if (k == n)
+          break;
+        endif
+      else
+        ## Input argument n not given => stop when hitting a return key.
+        ## if (button(k) == 0x0D || button(k) == 0x0A)
+        ##   ## hit Return or Enter
+        if (button(k) == 0x0D)
+          ## hit Return
+          x(k:end) = [];
+          y(k:end) = [];
+          button(k:end) = [];
+          break;
+        endif
+      endif
+    endwhile
+
+  unwind_protect_cleanup
+    if (use_mkfifo)
+      unlink (gpin_name);
+    endif
+  end_unwind_protect
+
+endfunction
+