julia(6) XScreenSaver manual julia(6)

NAME

julia - draws spinning, animating julia-set fractals

SYNOPSIS

julia [--display host:display.screen] [--foreground color]
[--background color] [--window] [--root] [--window-id number][--mono]
[--install] [--visual visual] [--ncolors integer] [--delay
microseconds] [--cycles integer] [--count integer]

[--fps]

DESCRIPTION

The julia program draws spinning, animating julia-set fractals.

It uses ifs {w0 = sqrt(x-c), w1 = -sqrt(x-c)} with random iteration
to plot the julia set, and sinusoidially varied parameters for the
set, and plots parameters with a circle.

One thing to note is that count is the depth of the search tree, so
the number of points computed is (2^count)-1. I use 8 or 9 on a
dx266 and it looks okay. The sinusoidal variation of the parameter
might not be as interesting as it could, but it still gives an idea
of the effect of the parameter.

Dragging the mouse in the window uses the mouse's position as the
control point for the generation of ths set.

OPTIONS

julia accepts the following options:

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

--root Draw on the root window.

--window-id number
Draw on the specified window.

--mono If on a color display, pretend we're on a monochrome display.

--install
Install a private colormap for the window.

--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.

--ncolors integer
How many colors should be used (if possible). Default 200.
The colors used cycle through the hue, making N stops around
the color wheel.

--cycles integer


--count integer

--fps Display the current frame rate and CPU load.

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.

XSCREENSAVER_WINDOW
The window ID to use with --root.

SEE ALSO

X(1), xscreensaver(1), xlock(1)

COPYRIGHT

Copyright (C) 1995 by Sean McCullough.

Permission to use, copy, modify, and distribute this software and its
documentation for any purpose and without fee is hereby granted,
provided that the above copyright notice appear in all copies and
that both that copyright notice and this permission notice appear in
supporting documentation.

AUTHOR

Sean McCullough <bankshot@mailhost.nmt.edu>, 1995.

Ability to run standalone or with xscreensaver added by Jamie
Zawinski <jwz@jwz.org>, 10-May-97.

X Version 11 6.09 (07-Jun-2024) julia(6)