1 .TH XScreenSaver 1 "28-May-97" "X Version 11"
3 julia - draws spinning, animating julia-set fractals
6 [\-display \fIhost:display.screen\fP] [\-foreground \fIcolor\fP] [\-background \fIcolor\fP] [\-window] [\-root] [\-mono] [\-install] [\-visual \fIvisual\fP] [\-ncolors \fIinteger\fP] [\-delay \fImicroseconds\fP] [\-cycles \fIinteger\fP] [\-count \fIinteger\fP] [\-mouse] [\-nomouse]
9 The \fIjulia\fP program draws spinning, animating julia-set fractals.
11 It uses ifs {w0 = sqrt(x-c), w1 = -sqrt(x-c)} with random iteration
12 to plot the julia set, and sinusoidially varied parameters for the set,
13 and plots parameters with a circle.
15 One thing to note is that count is the \fIdepth\fP of the search tree,
16 so the number of points computed is (2^count)-1. I use 8 or 9 on a
17 dx266 and it looks okay. The sinusoidal variation of the parameter
18 might not be as interesting as it could, but it still gives an idea
19 of the effect of the parameter.
23 accepts the following options:
26 Draw on a newly-created window. This is the default.
29 Draw on the root window.
32 If on a color display, pretend we're on a monochrome display.
35 Install a private colormap for the window.
37 .B \-visual \fIvisual\fP
38 Specify which visual to use. Legal values are the name of a visual class,
39 or the id number (decimal or hex) of a specific visual.
41 .B \-ncolors \fIinteger\fP
42 How many colors should be used (if possible). Default 200.
43 The colors used cycle through the hue, making N stops around
46 .B \-cycles \fIinteger\fP
49 .B \-count \fIinteger\fP
55 If \fI\-mouse\fP is specified, the control point of the Julia set will
56 be derived from the position of the mouse in the window. When the mouse
57 is not in the window, the control point is chosen the normal way.
62 to get the default host and display number.
65 to get the name of a resource file that overrides the global resources
66 stored in the RESOURCE_MANAGER property.
72 Copyright \(co 1995 by Sean McCullough.
74 Permission to use, copy, modify, and distribute this software and its
75 documentation for any purpose and without fee is hereby granted,
76 provided that the above copyright notice appear in all copies and that
77 both that copyright notice and this permission notice appear in
78 supporting documentation.
80 Sean McCullough <bankshot@mailhost.nmt.edu>, 1995.
82 Ability to run standalone or with \fIxscreensaver\fP added by
83 Jamie Zawinski <jwz@netscape.com>, 10-May-97.