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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]
 
        [-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.
 

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.
 
        -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.
        X(1), xscreensaver(1), xlock(1)
 

COPYRIGHT

        Copyright (C) 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.