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+% $Id: xyatip.mf,v 3.8 2010/06/10 18:45:50 krisrose Exp $
+%
+% Generate upper arrow tips for Xy-pic.
+% Copyright (c) 1994-1996 Kristoffer H. Rose <kris@diku.dk>
+%
+% This file is part of the Xy-pic macro package.
+%
+% The Xy-pic macro package 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 2 of the License, or (at your
+% option) any later version.
+%
+% The Xy-pic macro package 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 macro package; if not, see http://www.gnu.org/licenses/.
+%
+% As a special exception, you may use this file and all files derived
+% from it without restriction. This special exception was added with
+% version 3.7 of Xy-pic.
+% _________________________________________________________________________
+%
+% CONTENTS: Arrow tips *pointing* in all directions. With zero bounding box
+% placed at the tip; note most of the ink goes on the opposite side of where
+% the tip points.
+%
+% Generates the half of the tip that is upper when pointing right.
+% _________________________________________________________________________
+%
+pickup pencircle scaled segw; char_pen := savepen;
+%
+% chartowards makes char cc a tip pointing towards (dx,dy)...
+%
+def chartowards(expr cc,dx,dy) =
+ beginchar(cc,0,0,0);
+ a := angle(dx,dy);
+ z0 = (tipo,0) rotated a; % tip of tip
+ z1 = (-segl,0) rotated a; % center of tail
+ z2 = (-segl,1/2 segx) rotated a; % tail ends
+ z3 = curvature [z1,z2]; % tail directions
+ pickup char_pen; draw z2..{-z3}z0;
+ penlabels(0,1,2,3);
+ endchar
+enddef;
+
+% TESTING...we redefine openit because the characters extend far to the
+% left of the bounding box!
+%
+def openit = openwindow currentwindow
+ from origin to (screen_cols,screen_rows) at (-200,300) enddef;
+
+% GENERATE...
+%
+input xyd
+
+bye.
+%
+% $Log: xyatip.mf,v $
+% Revision 3.8 2010/06/10 18:45:50 krisrose
+% Reference to GPL by URL.
+%
+% Revision 3.7 1999/02/16 15:12:50 krisrose
+% Interim release (Y&Y fonts now free).
+%
+% Revision 3.3 1996/12/19 04:05:28 krisrose
+% New for this maintenance release.
+%
+% Based on xyatip10.mf,v 3.0 1995/07/07 20:14:21 kris Exp