%%%% elpsd_02.ldf %%%% Created by Laurence D. Finston (LDF) Wed Dec 7 18:15:43 CET 2005 %% * (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, 2014, 2015, 2016, 2017, 2018, 2019, 2020, 2021, 2022, 2023 The Free Software Foundation, Inc. %%%% 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 '' 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 %% *** (3) The surrounding `cuboid' of an `ellipsoid'. %% The problem of finding the inscribed `cuboid' is more %% difficult, and I don't know how to do it yet. %% %% LDF 2005.12.07. verbatim_metapost "verbatimtex \font\large=cmr17 scaled \magstep4 etex"; pickup pencircle scaled (1mm, 1mm); picture save_picture; focus f; set f with_position (-10, 15, -30) with_direction (-10, 15, 100) with_distance 20; beginfig(1); ellipsoid E; set E with_center origin with_axis_x 24 with_axis_y 16 with_axis_z 10 with_divisions_x 8 with_divisions_y 8 with_divisions_z 2 with_point_count 64; %rotate E (15, 15); %shift E (1, 2, 3); draw E; cuboid c[]; %c0 := in_cuboid E; c1 := out_cuboid E; draw c1 with_color blue; save_picture := current_picture; point label_pt; label_pt := (0, -6); %label("{\large Perspective Projection}", label_pt shifted (0, -3)); endfig with_focus f; beginfig(2); output save_picture with_projection parallel_x_z; %label("{\large Parallel Projection, X-Z Plane}", label_pt); endfig with_projection parallel_x_y no_sort; beginfig(3); output save_picture with_projection parallel_x_y; %label("{\large Parallel Projection, X-Y Plane}", label_pt); endfig with_projection parallel_x_y no_sort; beginfig(4); output save_picture with_projection parallel_z_y; %label("{\large Parallel Projection, Z-Y Plane}", label_pt); endfig with_projection parallel_x_y no_sort; verbatim_metapost "end"; end;