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########################################################################
##
## Copyright (C) 2004-2024 The Octave Project Developers
##
## See the file COPYRIGHT.md in the top-level directory of this
## distribution or <https://octave.org/copyright/>.
##
## 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
## <https://www.gnu.org/licenses/>.
##
########################################################################
## -*- texinfo -*-
## @deftypefn {} {[@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)
if (compare_versions (__gnuplot_version__ (), "4.0", "<="))
error ("ginput: version %s of gnuplot not supported", gnuplot_version ());
endif
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 (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 = tempname ();
[err, msg] = mkfifo (gpin_name, 600);
if (err)
error ("ginput: Can not open fifo (%s)", msg);
endif
endif
unwind_protect
k = 0;
while (true)
k += 1;
## 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)
error ("ginput: Can not open FIFO (%s)", msg);
endif
fputs (ostream, "pause mouse any;\n\n");
fputs (ostream, ["\n" 'if (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
fputs (ostream, ['set print "-";' "\n"]);
fflush (ostream);
fputs (ostream, "pause mouse any;\n\n");
fputs (ostream, ["\n" 'if (exists("MOUSE_KEY") && exists("MOUSE_X")) key = (MOUSE_KEY==1063 ? 1 : MOUSE_KEY); print "OCTAVE: ", MOUSE_X, MOUSE_Y, 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 = fread (istream, "*char")';
if (isempty (str))
pause (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 (button(k) == 0x0D || button(k) == 0x0A)
## Stop when hitting a RETURN or ENTER key.
x(k:end) = [];
y(k:end) = [];
button(k:end) = [];
break;
endif
if (nargin > 1 && k == n)
## Input argument n was given, stop when k == n.
break;
endif
endwhile
unwind_protect_cleanup
if (use_mkfifo)
unlink (gpin_name);
endif
end_unwind_protect
endfunction
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