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function _hidden(varargin)
[lhs,rhs]=argn(0);
win=get('current_figure');
ax=get('current_axes');
if rhs==1
if varargin(1)=='on'
cmd="on";
elseif varargin(1)=='off'
cmd="off";
else
_error('hold : unknown hidden state (must be ''on'' or ''off'')')
end
elseif rhs==0
cmd="toggle";
end
IMD=win.immediate_drawing;
win.immediate_drawing="off";
h=get(ax,'children');
for i=1:size(h,1);
_done=%f;
if or(h(i).user_data.typeOfPlot==["mesh";"trimesh"])
if cmd=="on" | cmd=="toggle"
if h(i).user_data.FaceColor=="none"
h(i).user_data.FaceColor="default";
h(i).color_mode=findColorIndex(win,ax.user_data.Color);
_done=%t;
end
end
if cmd=="off" | (cmd=="toggle" & ~_done)
if h(i).user_data.FaceColor=="default"
h(i).user_data.FaceColor="none";
h(i).color_mode=0;
end
end
end
end
win.immediate_drawing=IMD;
endfunction
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