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Annotated edit history of penrose(1) version 4, including all changes. View license author blame.
Rev Author # Line
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 penrose - draws quasiperiodic tilings
16 !!SYNOPSIS
17
18
19 __penrose__ [[-display ''host:display.screen'']
20 [[-foreground ''color''] [[-background ''color'']
21 [[-window] [[-root] [[-mono] [[-install] [[-visual ''visual'']
22 [[-ncolors ''integer''] [[-delay ''microseconds'']
23 [[-redoDelay ''seconds''] [[-size ''integer''] [[-ammann]
24 [[-no-ammann]
25 !!DESCRIPTION
26
27
28 The ''penrose'' program draws quasiperiodic
29 tilings.
30
31
3 perry 32 See Onoda, Steinhardt, !DiVincenzo and Socolar in Phys. Rev.
1 perry 33 Lett. 60, #25, 1988 or Strandburg in Computers in Physics,
34 Sep/Oct 1991.
35
36
37 This implementation uses the simpler version of the growth
38 algorithm, i.e., if there are no forced vertices, a randomly
39 chosen tile is added to a randomly chosen vertex (no
40 preference for those 108 degree angles).
41
42
43 There are two essential differences to the algorithm
44 presented in the literature: First, we do not allow the
45 tiling to enclose an untiled area. Whenever this is in
46 danger of happening, we just do not add the tile, hoping for
47 a better random choice the next time. Second, when choosing
48 a vertex randomly, we will take one that lies withing the
49 viewport if available. If this seems to cause enclosures in
50 the forced rule case, we will allow invisible vertices to be
51 chosen.
52
53
54 Tiling is restarted whenever one of the following happens:
55 there are no incomplete vertices within the viewport or the
56 tiling has extended a window's length beyond the edge of the
57 window horizontally or vertically or forced rule choice has
58 failed 100 times due to areas about to become
59 enclosed.
60
61
62 Although quasiperiodic tilings are produced, the tiles
63 themselves are not penrose tiles (darts and kites). In
64 contrast to penrose tiles, these tiles can be arranged to
65 form a periodic tiling.
66 !!OPTIONS
67
68
69 ''penrose'' accepts the following options:
70
71
72 __-window__
73
74
75 Draw on a newly-created window. This is the
76 default.
77
78
79 __-root__
80
81
82 Draw on the root window.
83
84
85 __-mono__
86
87
88 If on a color display, pretend we're on a monochrome
89 display.
90
91
92 __-install__
93
94
95 Install a private colormap for the window.
96
97
98 __-visual__ ''visual''
99
100
101 Specify which visual to use. Legal values are the name of a
102 visual class, or the id number (decimal or hex) of a
103 specific visual.
104
105
106 __-ncolors__ ''integer''
107
108
109 How many colors should be used (if possible). Default 64.
110 The colors are chosen randomly.
111
112
113 __-size__ ''integer''
114
115
116 How big the tiles should be. Default 40 pixels.
117
118
119 __-delay__ ''milliseconds''
120
121
122 How long (in 1/1,000,000'ths of a second) to wait between
123 drawing each tile. Default 10,000 or .01
124 seconds.
125
126
127 __-redoDelay__ ''seconds''
128
129
130 How long to wait between starting a completely new tiling.
131 Default 3 seconds.
132
133
134 __-ammann__ ''integer''
135
136
137 __-no-ammann__ ''integer''
138
139
140 Whether Ammann lines should be added.
141 !!ENVIRONMENT
142
143
144 __DISPLAY__
145
146
147 to get the default host and display number.
148
149
150 __XENVIRONMENT__
151
152
153 to get the name of a resource file that overrides the global
154 resources stored in the RESOURCE_MANAGER
155 property.
156 !!SEE ALSO
157
158
4 perry 159 X(1), xscreensaver(1),
1 perry 160 xlock(1)
161 !!COPYRIGHT
162
163
164 Copyright 1996 by Timo Korvola.
165
166
167 Permission to use, copy, modify, and distribute this
168 software and its documentation for any purpose and without
169 fee is hereby granted, provided that the above copyright
170 notice appear in all copies and that both that copyright
171 notice and this permission notice appear in supporting
172 documentation.
173 !!AUTHOR
174
175
176 Timo Korvola
177
178
179 Ability to run standalone or with ''xscreensaver'' added
180 by Jamie Zawinski
181 ''
182 ----
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