1 This directory contains examples for the `chem' language.
3 You can view the graphical display of the examples by calling
7 `groffer' calls `chem' automatically.
9 If you want to transform example files to a different format use the
12 `roff2dvi' prints dvi format to standard output,
13 `roff2html' generates html output,
14 `roff2pdf' outputs pdf mode,
15 `roff2ps' produces PostScript output,
16 `roff2text' generates text output in the groff device `latin1',
17 `roff2x' prints the output in the groff device X that is
18 suitable for programs like `gxditview' or `xditview'.
20 To get a suitable `groff' output run
22 @g@chem <file> | groff -p ...
24 On the displays, you can see rings consisting of several lines and
25 bonds (lines). All points on rings and bonds that do not have a
26 notation mean a C atom (carbon) filled with H atoms (hydrogen) such
27 that the valence of 4 is satisfied.
29 For example, suppose you have just a single line without any
30 characters. That means a bond. It has two points, one at each end of
31 the line. So each of these points stands for a C atom, the bond
32 itself connects these 2 C atoms. To fulfill the valence of 4, each
33 points has to carry additionally 3 H atoms. So the single empty bond
34 stands for CH3-CH3, though this combination doesn't make much sense
40 Copyright (C) 2006-2014 Free Software Foundation, Inc.
41 Written by Bernd Warken <groff-bernd.warken-72@web.de>.
43 This file is part of `chem', which is part of `groff'.
45 `groff' is free software; you can redistribute it and/or modify it
46 under the terms of the GNU General Public License as published by
47 the Free Software Foundation, either version 3 of the License, or
48 (at your option) any later version.
50 `groff' is distributed in the hope that it will be useful, but WITHOUT
51 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
52 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
55 The GPL2 license text is available in the internet at
56 <http://www.gnu.org/licenses/gpl-2.0.html>.
59 ####### Emacs settings