update packages

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

diff --git a/octave_packages/m/plot/hidden.m b/octave_packages/m/plot/hidden.m
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+++ b/octave_packages/m/plot/hidden.m
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+## Copyright (C) 2007-2012 Michael Goffioul
+##
+## 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} {} hidden (@var{mode})
+## @deftypefnx {Function File} {} hidden ()
+## Manipulation the mesh hidden line removal.  Called with no argument
+## the hidden line removal is toggled.  The argument @var{mode} can be either
+## 'on' or 'off' and the set of the hidden line removal is set accordingly.
+## @seealso{mesh, meshc, surf}
+## @end deftypefn
+
+function retval = hidden (mode)
+
+  if (nargin == 0)
+    mode = "swap";
+  elseif (nargin == 1);
+    if (ischar (mode))
+      mode = tolower (mode);
+      if (! strcmp (mode, "on") && ! strcmp (mode, "off"))
+        error ("hidden: MODE expected to be 'on' or 'off'");
+      endif
+    else
+      error ("hidden: expecting MODE to be a string");
+    endif
+  else
+    print_usage ();
+  endif
+
+  for h = get (gca (), "children");
+    htype = lower (get (h, "type"));
+    if (strcmp (htype, "surface"))
+      fc = get (h, "facecolor");
+      if ((! ischar (fc) && is_white (fc))
+          || (ischar (fc) && strcmpi (fc, "none")))
+        switch (mode)
+        case "on"
+          set (h, "facecolor", "w");
+        case "off"
+          set (h, "facecolor", "none");
+        case "swap"
+          if (ischar (fc))
+            set (h, "facecolor", "w");
+            mode = "on";
+          else
+            set (h, "facecolor", "none");
+            mode = "off";
+          endif
+        endswitch
+      endif
+    endif
+  endfor
+
+  if (nargout > 0)
+    retval = mode;
+  endif
+
+endfunction
+
+function retval = is_white (color)
+  retval = all (color == 1);
+endfunction