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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  frac-
     tals.

     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.


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_MANAGER
             property.

SEE ALSO
     X(1), xscreensaver(1), xlock(1)

COPYRIGHT
     Copyright O 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 docu-
     mentation.

AUTHOR
     Sean McCullough <[email protected]>, 1995.

     Ability to run standalone  or  with  xscreensaver  added  by
     Jamie Zawinski <[email protected]>, 10-May-97.

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