NAME

       unknownpleasures - a waterfall graph of the signal from pulsar PSR B1919+21.

SYNOPSIS

       unknownpleasures [-display host:display.screen] [-visual visual] [-window] [-root] [-delay
       number] [-count number] [-speed number] [-resolution number] [-amplitude  number]  [-noise
       number] [-mask file] [-no-ortho] [-buzz] [-wireframe] [-fps]

DESCRIPTION

       PSR  B1919+21  (AKA CP 1919) was the first pulsar ever discovered: a spinning neutron star
       emitting a periodic lighthouse-like beacon. An illustration of the signal received from it
       was  published  in Scientific American in 1971, and later in The Cambridge Encyclopedia of
       Astronomy in 1977, where it was seen by Stephen Morris, the drummer of Joy  Division,  and
       was  consequently appropriated by Peter Saville for the cover of the band's album "Unknown
       Pleasures".

OPTIONS

       -visual visual
               Specify which visual to use.  Legal values are the name of a visual class, or  the
               id number (decimal or hex) of a specific visual.

       -window Draw on a newly-created window.  This is the default.

       -root   Draw on the root window.

       -delay number
               Per-frame delay, in microseconds.  Default: 30000 (0.03 seconds).

       -speed number
               Animation speed. 2 for twice as fast, 0.5 for half as fast.

       -count number
               Scanlines (vertical resolution).  Default: 80.

       -resolution number
               Horizontal Resolution, Default: 100.

       -amplitude number
               Height of the waves, 0 - 1.0.  Default: 0.13.

       -noise number
               How noisy the signal is. 2 for twice as noisy, 0.5 for half as noisy.

       -mask file
               Use  the  given  image  file as a clipping mask against the data.  A high contrast
               image of around 256x256 works best.  Signal peaks appear in the dark areas.

       -ortho | -no-ortho
               Whether to use an orthographic projection.

       -buzz | -no-buzz
               Whether each line should seethe with noise.

       -wireframe | -no-wireframe
               Render in wireframe instead of solid.

       -fps | -no-fps
               Whether to show a frames-per-second display at the bottom of the screen.

ENVIRONMENT

       DISPLAY to get the default host and display number.

       XENVIRONMENT
               to get the name of a resource file that overrides the global resources  stored  in
               the RESOURCE_MANAGER property.

SEE ALSO

       X(1), xscreensaver(1)

COPYRIGHT

       Copyright © 2013-2018 by Jamie Zawinski.  Permission to use, copy, modify, distribute, and
       sell this software and its documentation for any purpose is hereby  granted  without  fee,
       provided that the above copyright notice appear in all copies and that both that copyright
       notice and this permission notice appear in supporting documentation.  No  representations
       are  made  about the suitability of this software for any purpose.  It is provided "as is"
       without express or implied warranty.

AUTHOR

       Jamie Zawinski.