% This is
%		pkmakeneutral.mf
%
% Copyright (C) 1989-92  by Elmar Bartel.
%
% This program 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 1, or (at your option)
% any later version.
%
% This program 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 this program; if not, write to the Free Software
% Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
%
def MakeNeutral(expr White,Black) =
	if unknown LeftHalft: picture LeftHalf; fi
	LeftHalf:= Black;
	cull LeftHalf keeping (1,infinity);
	addto LeftHalf contour (unitsquare yscaled qs xscaled (qs/2));
	cull LeftHalf keeping (2,2);

	if unknown RightHalf: picture RightHalf; fi
	RightHalf:= White;
	cull RightHalf keeping (1,infinity);
	addto RightHalf contour
		(unitsquare yscaled qs xscaled (qs/2) shifted (qs/2,0));
	cull RightHalf keeping (2,2);
	NeutralMan:= LeftHalf;
	addto NeutralMan also RightHalf;
enddef;