1julia(6x)                     XScreenSaver manual                    julia(6x)
2
3
4

NAME

6       julia - draws spinning, animating julia-set fractals
7

SYNOPSIS

9       julia  [-display  host:display.screen] [-foreground color] [-background
10       color] [-window] [-root] [-mono] [-install] [-visual visual]  [-ncolors
11       integer]  [-delay  microseconds]  [-cycles  integer]  [-count  integer]
12       [-mouse] [-nomouse]
13
14

DESCRIPTION

16       The julia program draws spinning, animating julia-set fractals.
17
18       It uses ifs {w0 = sqrt(x-c), w1 = -sqrt(x-c)} with random iteration  to
19       plot  the  julia  set, and sinusoidially varied parameters for the set,
20       and plots parameters with a circle.
21
22       One thing to note is that count is the depth of the search tree, so the
23       number  of points computed is (2^count)-1.  I use 8 or 9 on a dx266 and
24       it looks okay.  The sinusoidal variation of the parameter might not  be
25       as interesting as it could, but it still gives an idea of the effect of
26       the parameter.
27
28

OPTIONS

30       julia accepts the following options:
31
32       -window Draw on a newly-created window.  This is the default.
33
34       -root   Draw on the root window.
35
36       -mono   If on a color display, pretend we're on a monochrome display.
37
38       -install
39               Install a private colormap for the window.
40
41       -visual visual
42               Specify which visual to use.  Legal values are the  name  of  a
43               visual  class,  or the id number (decimal or hex) of a specific
44               visual.
45
46       -ncolors integer
47               How many colors should be used  (if  possible).   Default  200.
48               The  colors  used  cycle through the hue, making N stops around
49               the color wheel.
50
51       -cycles integer
52
53
54       -count integer
55
56
57       -mouse
58
59       -nomouse
60               If -mouse is specified, the control point of the Julia set will
61               be  derived from the position of the mouse in the window.  When
62               the mouse is not in the window, the control point is chosen the
63               normal way.
64

ENVIRONMENT

66       DISPLAY to get the default host and display number.
67
68       XENVIRONMENT
69               to  get  the  name of a resource file that overrides the global
70               resources stored in the RESOURCE_MANAGER property.
71

SEE ALSO

73       X(1), xscreensaver(1), xlock(1)
74

76       Copyright © 1995 by Sean McCullough.
77
78       Permission to use, copy, modify, and distribute this software  and  its
79       documentation  for  any purpose and without fee is hereby granted, pro‐
80       vided that the above copyright notice appear in  all  copies  and  that
81       both  that  copyright  notice and this permission notice appear in sup‐
82       porting documentation.
83

AUTHOR

85       Sean McCullough <bankshot@mailhost.nmt.edu>, 1995.
86
87       Ability to run standalone or with xscreensaver added by Jamie  Zawinski
88       <jwz@jwz.org>, 10-May-97.
89
90
91
92X Version 11                 5.05-3 (06-Apr-2008)                    julia(6x)
Impressum