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Annotated edit history of julia(1) version 4, including all changes. View license author blame.
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1 perry 1 XScreenSaver
2 !!!XScreenSaver
3 NAME
4 SYNOPSIS
5 DESCRIPTION
6 OPTIONS
7 ENVIRONMENT
8 SEE ALSO
9 COPYRIGHT
10 AUTHOR
11 ----
12 !!NAME
13
14
15 julia - draws spinning, animating julia-set fractals
16 !!SYNOPSIS
17
18
19 __julia__ [[-display ''host:display.screen'']
20 [[-foreground ''color''] [[-background ''color'']
21 [[-window] [[-root] [[-mono] [[-install] [[-visual ''visual'']
22 [[-ncolors ''integer''] [[-delay ''microseconds'']
23 [[-cycles ''integer''] [[-count ''integer''] [[-mouse]
24 [[-nomouse]
25 !!DESCRIPTION
26
27
28 The ''julia'' program draws spinning, animating julia-set
29 fractals.
30
31
32 It uses ifs {w0 = sqrt(x-c), w1 = -sqrt(x-c)} with random
33 iteration to plot the julia set, and sinusoidially varied
34 parameters for the set, and plots parameters with a
35 circle.
36
37
38 One thing to note is that count is the ''depth'' of the
39 search tree, so the number of points computed is
40 (2^count)-1. I use 8 or 9 on a dx266 and it looks okay. The
41 sinusoidal variation of the parameter might not be as
42 interesting as it could, but it still gives an idea of the
43 effect of the parameter.
44 !!OPTIONS
45
46
47 ''julia'' accepts the following options:
48
49
50 __-window__
51
52
53 Draw on a newly-created window. This is the
54 default.
55
56
57 __-root__
58
59
60 Draw on the root window.
61
62
63 __-mono__
64
65
66 If on a color display, pretend we're on a monochrome
67 display.
68
69
70 __-install__
71
72
73 Install a private colormap for the window.
74
75
76 __-visual__ ''visual''
77
78
79 Specify which visual to use. Legal values are the name of a
80 visual class, or the id number (decimal or hex) of a
81 specific visual.
82
83
84 __-ncolors__ ''integer''
85
86
87 How many colors should be used (if possible). Default 200.
88 The colors used cycle through the hue, making N stops around
89 the color wheel.
90
91
92 __-cycles__ ''integer''
93
94
95 __-count__ ''integer''
96
97
98 __-mouse__
99
100
101 __-nomouse__
102
103
104 If ''-mouse'' is specified, the control point of the
105 Julia set will be derived from the position of the mouse in
106 the window. When the mouse is not in the window, the control
107 point is chosen the normal way.
108 !!ENVIRONMENT
109
110
111 __DISPLAY__
112
113
114 to get the default host and display number.
115
116
117 __XENVIRONMENT__
118
119
120 to get the name of a resource file that overrides the global
121 resources stored in the RESOURCE_MANAGER
122 property.
123 !!SEE ALSO
124
125
4 perry 126 X(1), xscreensaver(1),
1 perry 127 xlock(1)
128 !!COPYRIGHT
129
130
3 perry 131 Copyright 1995 by Sean !McCullough.
1 perry 132
133
134 Permission to use, copy, modify, and distribute this
135 software and its documentation for any purpose and without
136 fee is hereby granted, provided that the above copyright
137 notice appear in all copies and that both that copyright
138 notice and this permission notice appear in supporting
139 documentation.
140 !!AUTHOR
141
142
3 perry 143 Sean !McCullough
1 perry 144
145
146 Ability to run standalone or with ''xscreensaver'' added
147 by Jamie Zawinski
148 ''
149 ----
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