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## Copyright (C) 1996 John W. Eaton
##
## 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 2, 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, write to the Free
## Software Foundation, 59 Temple Place - Suite 330, Boston, MA
## 02111-1307, USA.
## Author: jwe
function __plt__ (caller, ...)
if (nargin == 2)
__plt1__ (va_arg (), "");
elseif (nargin > 2)
first_plot = 1;
hold_state = ishold ();
unwind_protect
x = va_arg ();
nargin = nargin - 2;
x_set = 1;
y_set = 0;
## Gather arguments, decode format, and plot lines.
while (nargin-- > 0)
fmt = "";
new = va_arg ();
if (isstr (new))
if (! x_set)
error ("plot: no data to plot");
endif
fmt = __pltopt__ (caller, new);
if (! y_set)
__plt1__ (x, fmt);
else
__plt2__ (x, y, fmt);
endif
hold on;
x_set = 0;
y_set = 0;
elseif (x_set)
if (y_set)
__plt2__ (x, y, fmt);
hold on;
x = new;
y_set = 0;
else
y = new;
y_set = 1;
endif
else
x = new;
x_set = 1;
endif
## Something fishy is going on. I don't think this should be
## necessary, but without it, sometimes not all the lines from a
## given plot command appear on the screen. Even with it, the
## delay might not be long enough for some systems...
usleep (1e5);
endwhile
## Handle last plot.
if (x_set)
if (y_set)
__plt2__ (x, y, fmt);
else
__plt1__ (x, fmt);
endif
endif
unwind_protect_cleanup
if (! hold_state)
hold off;
endif
end_unwind_protect
else
msg = sprintf ("%s (x)\n", caller);
msg = sprintf ("%s %s (x, y)\n", msg, caller);
msg = sprintf ("%s %s (x2, y1, x2, y2)\n", msg, caller);
msg = sprintf ("%s %s (x, y, fmt)", msg, caller);
usage (msg);
endif
endfunction
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