update packages

[CreaPhase.git] / octave_packages / m / plot / newplot.m

diff --git a/octave_packages/m/plot/newplot.m b/octave_packages/m/plot/newplot.m
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+## Copyright (C) 2005-2012 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 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} {} newplot ()
+## Prepare graphics engine to produce a new plot.  This function is
+## called at the beginning of all high-level plotting functions.
+## It is not normally required in user programs.
+## @end deftypefn
+
+function newplot ()
+
+  if (nargin == 0)
+    cf = gcf ();
+    fnp = get (cf, "nextplot");
+    switch (fnp)
+      ## FIXME -- probably we should do more than validate the nextplot
+      ## property value...
+      case "new"
+      case "add"
+      case "replacechildren"
+        delete (get (cf, "children"));
+      case "replace"
+      otherwise
+        error ("newplot: unrecognized nextplot property for current figure");
+    endswitch
+    ca = gca ();
+    anp = get (ca, "nextplot");
+    if (strcmp (get (ca, "__hold_all__"), "off"))
+      __next_line_color__ (true);
+      __next_line_style__ (true);
+    else
+      __next_line_color__ (false);
+      __next_line_style__ (false);
+    endif
+    switch (anp)
+      case "new"
+      case "add"
+      case "replacechildren"
+        delete (get (ca, "children"));
+      case "replace"
+        __go_axes_init__ (ca, "replace");
+        __request_drawnow__ ();
+      otherwise
+        error ("newplot: unrecognized nextplot property for current axes");
+    endswitch
+  else
+    print_usage ();
+  endif
+
+endfunction
+
+%!test
+%! hf = figure ("visible", "off");
+%! unwind_protect
+%!   p = plot ([0, 1]);
+%!   newplot;
+%!   assert (isempty (get (gca, "children")));
+%! unwind_protect_cleanup
+%!   close (hf);
+%! end_unwind_protect