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Annotated edit history of munch(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 HISTORY
10 COPYRIGHT
11 AUTHOR
12 ----
13 !!NAME
14
15
16 munch - munching squares screen hack
17 !!SYNOPSIS
18
19
20 __munch__ [[-display ''host:display.screen'']
21 [[-foreground ''color''] [[-background ''color'']
22 [[-window] [[-root] [[-mono] [[-install] [[-visual ''visual'']
23 [[-delay ''seconds''] [[-xor] [[-noxor] [[-shift] [[-noshift]
24 [[-logminwidth ''minimum width'']
25 !!DESCRIPTION
26
27
28 The ''munch'' program preforms the munching squares hack
29 until killed. It picks square size, position, and gravity
30 randomly; configurable options are listed
31 below.
32
33
34 The munching squares hack cosists of drawing Y = X XOR T for
35 a range of X and T over and over until all the possible
36 combinations of X and T have come up. It was reportedly
37 discovered by Jackson Wright in 1962 and took 5 instructions
38 of PDP-6 code.
39 !!OPTIONS
40
41
42 ''munch'' accepts the following options:
43
44
45 __-window__
46
47
48 Draw on a newly-created window. This is the
49 default.
50
51
52 __-root__
53
54
55 Draw on the root window.
56
57
58 __-mono__
59
60
61 If on a color display, pretend we're on a monochrome
62 display.
63
64
65 __-install__
66
67
68 Install a private colormap for the window.
69
70
71 __-visual__ ''visual''
72
73
74 Specify which visual to use. Legal values are the name of a
75 visual class, or the id number (decimal or hex) of a
76 specific visual.
77
78
79 __-delay__ ''seconds''
80
81
82 How long to wait before starting over. Default 5
83 seconds.
84
85
86 __-xor__
87
88
89 Use the XOR drawing function. (Default.)
90
91
92 __-no-xor__
93
94
95 Don't use the XOR drawing function.
96
97
98 __-shift__
99
100
101 Start drawing the square at weird starting points.
102 (Default.)
103
104
105 __-no-shift__
106
107
108 Don't shift and start drawing the square at weird starting
109 points.
110
111
112 __-logminwidth__ ''minimum-width''
113
114
115 The logarithm (base 2) of the minimum with of a square (must
116 be a power of 2, or some parts of the square
117 aren't.)
118 !!ENVIRONMENT
119
120
121 __DISPLAY__
122
123
124 to get the default host and display number.
125
126
127 __XENVIRONMENT__
128
129
130 to get the name of a resource file that overrides the global
131 resources stored in the RESOURCE_MANAGER
132 property.
133 !!SEE ALSO
134
135
4 perry 136 X(1), xscreensaver(1),
1 perry 137 __http://www.inwap.com/pdp10/hbaker/hakmem/hakmem.html,
138 http://www.comedia.com/Hot/jargon_3.0/JARGON_M/MUNCHSQR.HTML__
139 !!HISTORY
140
141
142 Quoted from HAKMEM, for historical interest. As that
143 document says,
144
145
146 ITEM 146: MUNCHING SQUARES
147
148
149 Another simple display program. It is thought that this was
150 discovered by Jackson Wright on the RLE PDP-1 circa
151 1962.
152
153
154 DATAI 2
155 ADDB 1,2
156 ROTC 2,-22
157 XOR 1,2
158 JRST .-4
159 2=X, 3=Y. Try things like 1001002 in data switches. This also does interesting things with operations other than XOR, and rotations other than -22. (Try IOR; AND; TSC; FADR; FDV(!); ROT -14, -9, -20, ...)
160
161
162 ITEM 147 (Schroeppel):
163
164
165 Munching squares is just views of the graph Y = X XOR T for
166 consecutive values of T = time.
167
168
169 ITEM 148 (Cohen, Beeler):
170
171
172 A modification to munching squares which reveals them in
173 frozen states through opening and closing curtains: insert
174 FADR 2,1 before the XOR. Try data switches =
175
176
177 4000,,4 1000,,2002 2000,,4 0,,1002
178 (Notation:
179
180
181 Also try the FADR after the XOR, switches =
182 1001,,1.
183 !!COPYRIGHT
184
185
186 Copyright 1997 by Tim Showalter. Permission to use, copy,
187 modify, distribute, and sell this software and its
188 documentation for any purpose is hereby granted without fee,
189 provided that the above copyright notice appear in all
190 copies and that both that copyright notice and this
191 permission notice appear in supporting documentation. No
192 representations are made about the suitability of this
193 software for any purpose. It is provided
194 !!AUTHOR
195
196
197 Tim Showalter
198 ----
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