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.