XScreenSaver(1)

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] [-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.

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

       -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 ALSO
       X(1) xscreensaver(1) xlock(1) 

COPYRIGHT
       Copyright (C) 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 lt;bankshot@mailhost.nmt.edu, 1995.

       Ability to run standalone or with  xscreensaver  added  by
       Jamie Zawinski lt;jwz@netscape.com, 10-May-97.