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+% 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;