julia(6x) XScreenSaver manual julia(6x)
NAME
julia - draws spinning, animating julia-set fractals
SYNOPSIS
julia [-display host:display.screen] [-foreground color] [-background
color] [-window] [-root] [-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 con-
trol 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.
-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.
SEE ALSO
X(1), xscreensaver(1), xlock(1)
COPYRIGHT
Copyright © 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, pro-
vided that the above copyright notice appear in all copies and that
both that copyright notice and this permission notice appear in sup-
porting 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 5.45 (08-Dec-2020) julia(6x)
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