julia



XScreenSaver(1)                                                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 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 © 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, pro-
       vided that the above copyright notice appear in  all  copies  and  that
       both  that  copyright  notice and this permission notice appear in sup-
       porting 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)

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