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<sect2 id="jbc">
<title>Jon's Binary Clock Applet</title>
<para>
<application>Jon's Binary Clock</application> applet, shown in <xref
linkend="jbcapplet-fig">, shows the time in an unusual form: binary
coded decimal. It has twenty-four LEDs which represent the hours,
minutes and seconds by illuminating the appropriate LED. To add this
applet to a <interface>Panel</interface>,
right-click on the <interface>Panel</interface> and choose
<menuchoice>
<guimenu>Panel</guimenu>
<guisubmenu>Add to panel</guisubmenu>
<guisubmenu>Applet</guisubmenu>
<guisubmenu>Clocks</guisubmenu>
<guimenuitem>JBC Binary Clock</guimenuitem>
</menuchoice>.
</para>
<figure id="jbcapplet-fig">
<title>Jon's Binary Clock Applet</title>
<screenshot>
<screeninfo>Jon's Binary Clock Applet</screeninfo>
<graphic format="png" fileref="figures/jbc_applet"
srccredit="muet">
</graphic>
</screenshot>
</figure>
<!-- ============= Usage ================================ -->
<sect3 id="APPLET-usage">
<title>Usage</title>
<para>
You don't need to do anything special to this clock. It just
sits there and flashes lights at you.
</para>
<para>
Right-clicking on the applet brings up a menu containing the
following items:
<itemizedlist>
<listitem>
<para>
<guimenuitem>Help</guimenuitem> —
displays this document.
</para>
</listitem>
<listitem>
<para>
<guimenuitem>About…</guimenuitem> —
shows basic information about <application>Jon's Binary Clock
Applet</application>, inluding the applet's version and the
author's name.
</para>
</listitem>
</itemizedlist>
</para>
</sect3>
<!-- ============= Deciphering the Lights =========================== -->
<sect3 id="jbc-deciphering">
<title>Deciphering the Lights</title>
<para>
BCD stands for binary-coded decimal, a way of representing
normal denary (0,1,2,3,4,5,6,7,8,9) numbers as what programmers
call "a set of binary numbers in four bits, thus removing the
numbers A to F". If this doesn't make sense, just be aware
that this clock is an amusement for programmers, and serves
no really useful purpose.
</para>
<para>
It helps to read this clock upside-down! Start at the bottom and
read up to the top.
</para>
<para>
The right-hand pair of columns shows the two digits of the seconds:
the units on the right, the tens on the left. The centre pair of
columns shows the two digits of the minutes. The left hand pair of
columns shows the two digits of the hours.
</para>
<para>
You add up the values of the illuminated LEDs in each column.
You should get a number between zero to nine for each. That's
the time.
</para>
<orderedlist>
<listitem>
<para>
The bottom LED represents 1 when it is illuminated.
</para>
</listitem>
<listitem>
<para>
The next LED represents 2 when it is illuminated.
</para>
</listitem>
<listitem>
<para>
The next LED represents 4 when it is illuminated.
</para>
</listitem>
<listitem>
<para>
The top LED represents 8 when it is illuminated.
</para>
</listitem>
</orderedlist>
<para>
It is probably simplest to decipher the hours and minutes
first before trying to follow the seconds, which are always
changing.
</para>
<para>
As an example, we can read the time in <xref
linkend="jbcapplet-fig">. Let's start with the hour. The first
column has only 1 LED on, in the second lowest position, so this
gives us <quote>2</quote> for the first digit of the hour. The
second column has no LEDs on, so we have a <quote>0</quote> for
the second digit of the hour. So the hour is <quote>20</quote>,
or 8PM for people who like AM/PM notation. Looking at the
minutes, we have <quote>0</quote> for the first digit, and
<quote>1</quote> for the second digit since only the bottom LED
is lit. This gives us "20:01" so far. Lastly, we have the
seconds. For the first digit, we have the lowest two LED's
lit. These have value 1 (for the lowest) and 2 (second lowest)
for a total of <quote>3</quote>. And the second column of the
seconds has the top LED lit, with a value of
<quote>8</quote>. Thus, the time is <quote>20:01:38</quote>, or
<quote>8:01:38PM</quote>.
</para>
</sect3>
<!-- ============= Bugs ================================== --> <!--
This section should describe known bugs and limitations of the
program if there are any - please be frank and list all problems you
know of -->
<sect3 id="jbc-bugs">
<title>Known Bugs and Limitations</title>
<para>
If you add it to a vertical panel, it is a nice size. If you then
move it to a horizonal panel, it changes size in the horizontal
panel. If you move it back to a vertical panel, it doesn't change
size back, and forces the panel to widen itself.
</para>
</sect3>
<!-- ============= Authors ================================ -->
<sect3 id="jbc-authors">
<title>Authors</title>
<para>
<application>Jon's Binary Clock</application> was written by Jon
Anhold (<email>jon@snoopy.net</email>. Please send all comments,
suggestions, and bug reports to the <ulink
url="http://bugs.gnome.org" type="http">GNOME bug tracking
database</ulink>. (Instructions for submitting bug reports can be
found <ulink url="http://bugs.gnome.org/Reporting.html"
type="http"> on-line</ulink>. If you are using GNOME 1.1 or later,
you can also use <application>Bug Report Tool</application>
(<command>bug-buddy</command>), available in the
<guisubmenu>Utilities</guisubmenu> submenu of <guimenu>Main
Menu</guimenu>, for submitting bug reports.
</para>
<para>
This manual was written by Telsa Gwynne
(<email>hobbit@aloss.ukuu.org.uk</email>). Please send all
comments and suggestions regarding this manual to the <ulink
type="http" url="http://www.gnome.org/gdp">GNOME Documentation
Project</ulink> by sending an email to
<email>docs@gnome.org</email>. You can also submit comments online
by using the <ulink type="http"
url="http://www.gnome.org/gdp/doctable/">GNOME Documentation
Status Table</ulink>.
</para>
<!-- For translations: uncomment this:
<para>
Latin translation was done by ME
(<email>MYNAME@MYADDRESS</email>). Please send all comments and
suggestions regarding this translation to SOMEWHERE.
</para>
-->
</sect3>
<!-- ============= Application License ============================= -->
<!--
<sect3 id="license">
<title>License</title>
<para>
This program is free software; you can redistribute it and/or
modify it under the terms of the <citetitle>GNU General Public
License</citetitle> as published by the Free Software Foundation;
either version 2 of the License, or (at your option) any later
version.
</para>
<para>
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
<citetitle>GNU General Public License</citetitle> for more details.
</para>
<para>
A copy of the <citetitle>GNU General Public License</citetitle> is
included as an appendix to the <citetitle>GNOME Users
Guide</citetitle>. You may also obtain a copy of the
<citetitle>GNU General Public License</citetitle> from the Free
Software Foundation by visiting <ulink type="http"
url="http://www.fsf.org">their Web site</ulink> or by writing to
<address>
Free Software Foundation, Inc.
<street>59 Temple Place</street> - Suite 330
<city>Boston</city>, <state>MA</state> <postcode>02111-1307</postcode>
<country>USA</country>
</address>
</para>
</sect3>
-->
</sect2>
|
