julia
Section: XScreenSaver manual (6x)
Updated: 6.00-1.fc34 (02-Apr-2021)
Page Index
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
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.
- -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,
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.