% This is
%		pkparallel.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 NewPoint(expr p,t,dist) =
	{ begingroup pair Dir;
		Dir= direction t of p; %show p; show t; show Dir;
		Dir
	  endgroup }
	(point t of p + (Dir rotated 90)*(dist/length(Dir)))
enddef;
def ParallelPath(expr p,dist) =
	begingroup
	save Dir; pair Dir; Dir = direction 0 of p;

	((point 0 of p)+(Dir rotated 90)*(dist/length(Dir))) {Dir}
	for t=.5 step .5 until length(p):
		.. NewPoint(p,t,dist)
	endfor
	endgroup
enddef;