1######################################################################## 2## 3## Copyright (C) 2007-2021 The Octave Project Developers 4## 5## See the file COPYRIGHT.md in the top-level directory of this 6## distribution or <https://octave.org/copyright/>. 7## 8## This file is part of Octave. 9## 10## Octave is free software: you can redistribute it and/or modify it 11## under the terms of the GNU General Public License as published by 12## the Free Software Foundation, either version 3 of the License, or 13## (at your option) any later version. 14## 15## Octave is distributed in the hope that it will be useful, but 16## WITHOUT ANY WARRANTY; without even the implied warranty of 17## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 18## GNU General Public License for more details. 19## 20## You should have received a copy of the GNU General Public License 21## along with Octave; see the file COPYING. If not, see 22## <https://www.gnu.org/licenses/>. 23## 24######################################################################## 25 26## -*- texinfo -*- 27## @deftypefn {} {} hidden 28## @deftypefnx {} {} hidden on 29## @deftypefnx {} {} hidden off 30## @deftypefnx {} {@var{mode} =} hidden (@dots{}) 31## Control mesh hidden line removal. 32## 33## When called with no argument the hidden line removal state is toggled. 34## 35## When called with one of the modes @qcode{"on"} or @qcode{"off"} the state 36## is set accordingly. 37## 38## The optional output argument @var{mode} is the current state. 39## 40## Hidden Line Removal determines what graphic objects behind a mesh plot 41## are visible. The default is for the mesh to be opaque and lines behind 42## the mesh are not visible. If hidden line removal is turned off then 43## objects behind the mesh can be seen through the faces (openings) of the 44## mesh, although the mesh grid lines are still opaque. 45## 46## @seealso{mesh, meshc, meshz, ezmesh, ezmeshc, trimesh, waterfall} 47## @end deftypefn 48 49function state = hidden (mode = "toggle") 50 51 if (nargin > 2) 52 print_usage (); 53 elseif (nargin == 1) 54 if (! ischar (mode)) 55 error ("hidden: MODE must be a string"); 56 elseif (! any (strcmpi (mode, {"on", "off"}))) 57 error ('hidden: MODE must be "on" or "off"'); 58 endif 59 endif 60 61 for h = (get (gca (), "children")).' 62 [htype, htag] = get (h, {"type", "tag"}){:}; 63 if (strcmp (htype, "surface") || strcmp (htag, "trimesh")) 64 fc = get (h, "facecolor"); 65 if ((! ischar (fc) && is_white (fc)) 66 || (ischar (fc) && strcmp (fc, "none"))) 67 switch (mode) 68 case "on" 69 set (h, "facecolor", "w"); 70 case "off" 71 set (h, "facecolor", "none"); 72 case "toggle" 73 if (ischar (fc)) 74 set (h, "facecolor", "w"); 75 mode = "on"; 76 else 77 set (h, "facecolor", "none"); 78 mode = "off"; 79 endif 80 endswitch 81 endif 82 endif 83 endfor 84 85 if (nargout > 0) 86 state = mode; 87 endif 88 89endfunction 90 91function retval = is_white (color) 92 retval = all (color == 1); 93endfunction 94