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.