XScreenSaver(1)XScreenSaver(1)NAMEjulia - draws spinning, animating julia-set fractals
SYNOPSISjulia [-display host:display.screen] [-foreground color]
[-background color] [-window] [-root] [-mono] [-install]
[-visual visual] [-ncolors integer] [-delay microseconds]
[-cycles integer] [-count integer] [-mouse] [-nomouse]
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 cir
cle.
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.
OPTIONSjulia 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
-mouse
-nomouse
If -mouse is specified, the control point of the
Julia set will be derived from the position of the
mouse in the window. When the mouse is not in the
window, the control point is chosen the normal
way.
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_MAN
AGER property.
SEE ALSOX(1), xscreensaver(1), xlock(1)COPYRIGHT
Copyright 1995 by Sean McCullough.
Permission to use, copy, modify, and distribute this soft
ware 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 28-May-97 XScreenSaver(1)
