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%%%% wave_1.ldf
%%%% Created by Laurence D. Finston (LDF) Fri Mar 3 18:49:02 CET 2006
%% * (1) Copyright and License.
%%%% This file is part of GNU 3DLDF, a package for three-dimensional drawing.
%%%% Copyright (C) 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013 The Free Software Foundation
%%%% GNU 3DLDF 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 3 of the License, or
%%%% (at your option) any later version.
%%%% GNU 3DLDF 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 GNU 3DLDF; if not, write to the Free Software
%%%% Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
%%%% GNU 3DLDF is a GNU package.
%%%% It is part of the GNU Project of the
%%%% Free Software Foundation
%%%% and is published under the GNU General Public License.
%%%% See the website http://www.gnu.org
%%%% for more information.
%%%% GNU 3DLDF is available for downloading from
%%%% http://www.gnu.org/software/3dldf/LDF.html.
%%%% Please send bug reports to Laurence.Finston@gmx.de
%%%% The mailing list help-3dldf@gnu.org is available for people to
%%%% ask other users for help.
%%%% The mailing list info-3dldf@gnu.org is for the maintainer of
%%%% GNU 3DLDF to send announcements to users.
%%%% To subscribe to these mailing lists, send an
%%%% email with ``subscribe <email-address>'' as the subject.
%%%% The author can be contacted at:
%%%% Laurence D. Finston
%%%% c/o The Free Software Foundation, Inc.
%%%% 51 Franklin St, Fifth Floor
%%%% Boston, MA 02110-1301
%%%% USA
%%%% Laurence.Finston@gmx.de
%% !! Important: LDF 2010.10.15.
%% I've commented-out some code and rearranged some other code.
%% The MetaPost code generated from this file (in `wave_1.mp') must be altered
%% slightly by hand. I've check the latter file into the CVS repository.
%% This is necessary, because problems have arisen with |Picture::output| that didn't exist
%% with an older version of GCC.
%% *** (3) Wave forms 1. LDF 2006.03.03.
picture frame_picture;
beginfig(0);
path frame;
frame := unit_rectangle rotated 90 scaled (16, 16) shifted (8, 0);
draw frame with_pen pencircle scaled (.5mm, .5mm, .5mm);
frame_picture := current_picture;
endfig;
point p;
path null_path;
k := 36;
sign := 1;
t := 143;
for j = 0 upto 71:
path q;
if (j == 36):
sign *= -1;
fi;
k -= sign;
for i = 0 upto 36:
m := i * 360 / 16;
n := (sind m) * k / 36;
p := (.5 * i, 2 * n * sign);
q += p;
endfor;
q += ..;
beginfig(j + 1);
draw q with_pen pencircle scaled (1mm, 1mm);
% output current_picture with_projection parallel_x_y;
% clear current_picture;
% output frame_picture with_projection parallel_x_y;
endfig with_projection parallel_x_y;
clip_to frame;
beginfig(t);
draw q with_pen pencircle scaled (1mm, 1mm);
% output current_picture with_projection parallel_x_y;
% clip_to frame;
% clear current_picture;
% output frame_picture with_projection parallel_x_y;
endfig with_projection parallel_x_y;
draw frame;
clip_to frame;
t -= 1;
endfor;
verbatim_metapost "end";
end;
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