## 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, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
## 02110-1301, USA.

## -*- texinfo -*-
## @deftypefn {Function File} {} __plt3__ (@var{x}, @var{y}, @var{z}, @var{fmt})
## @end deftypefn

## Author: Paul Kienzle <kienzle.powernet.co.uk>
## 2001-04-06 Paul Kienzle <kienzle.powernet.co.uk>
##     * __gnuplot_set__ nohidden3d; vector X,Y, matrix Z => meshgrid(X,Y)

## Modified to use new gnuplot interface in octave > 2.9.0
## Dmitri A. Sergatskov <dasergatskov@gmail.com>
## April 18, 2005
## Modified to use NaN as seperator for gnuplot, so multiple calls
## aren't needed.
## David Bateman <dbateman@free.fr>
## May 25, 2006

function __plt3__ (x, usingstr, fmt, key, withstr)

  if (nargin < 2)
    have_usingstr = false;
    usingstr = "";
  else
    have_usingstr = true;
  endif
  if (nargin < 3 || isempty (fmt))
    fmt = "";
  endif
  if (nargin < 4 || isempty (key))
    key = "";
  endif
  if (nargin < 5)
    withstr = "";
  endif

  __plot_globals__;

  cf = __current_figure__;
  mxi = __multiplot_xi__(cf);
  myi = __multiplot_yi__(cf);

  __setup_plot__ ("splot");

  j = __plot_data_offset__{cf}(mxi,myi);

  __plot_data__{cf}{mxi,myi}{j}{1} = x;
  __plot_data_type__{cf}{mxi,myi}(j) = 3;
  __plot_data_parametric__{cf}{mxi,myi}{j}{1} = parametric;
  __plot_key_labels__{cf}{mxi,myi}{j}{1} = keystr;

  __plot_fmtstr__{cf}{mxi,myi}{j}{1} = fmtstr;
  if (have_usingstr)
    __plot_usingstr__{cf}{mxi,myi}{j}{1} = usingstr;
  else
    __plot_usingstr__{cf}{mxi,myi}{j}{1} = __make_using_clause__(x);
  endif
  __plot_withstr__{cf}{mxi,myi}{j}{1} = withstr;

  __plot_data_offset__{cf}(mxi,myi) = ++j;

  __render_plot__ ();

endfunction