1munch(6x) XScreenSaver manual munch(6x)
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6 munch - munching squares
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9 munch [-display host:display.screen] [-foreground color] [-background
10 color] [-window] [-root] [-mono] [-install] [-visual visual] [-delay
11 usecs] [-xor] [-noxor] [-clear number] [-simul number] [-classic |
12 -mismunch | -random] [-fps]
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15 The munch program performs the munching squares hack. It picks square
16 size, position, and gravity randomly. It also displays a creatively
17 broken misimplementation of the classic algorithm.
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19 The munching squares hack consists of drawing Y = X XOR T for a range
20 of X and T over and over until all the possible combinations of X and T
21 have come up. It was reportedly discovered by Jackson Wright in 1962
22 and took 5 instructions of PDP-6 code.
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25 munch accepts the following options:
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27 -window Draw on a newly-created window. This is the default.
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29 -root Draw on the root window.
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31 -mono If on a color display, pretend we're on a monochrome display.
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33 -install
34 Install a private colormap for the window.
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36 -visual visual
37 Specify which visual to use. Legal values are the name of a
38 visual class, or the id number (decimal or hex) of a specific
39 visual.
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41 -delay usecs
42 The delay between steps of the animation, in microseconds.
43 Default: 2500.
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45 -xor Use the XOR drawing function. This is the default.
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47 -no-xor Don't use the XOR drawing function.
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49 -clear number
50 Number of squares to misdraw before clearing the display.
51 Default: 65.
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53 -simul number
54 Number of squares to misdraw simultaneously. Default: 5.
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56 -classic
57 Draw classic munching squares only.
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59 -mismunch
60 Draw "mismunch" only.
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62 -random Do one or the other.
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64 -fps Display the current frame rate and CPU load.
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67 DISPLAY to get the default host and display number.
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69 XENVIRONMENT
70 to get the name of a resource file that overrides the global
71 resources stored in the RESOURCE_MANAGER property.
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74 X(1), xscreensaver(1),
75 http://www.inwap.com/pdp10/hbaker/hakmem/hakmem.html
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78 HAKMEM: MIT AI Memo 239, Feb. 29, 1972.
79 Beeler, M., Gosper, R.W., and Schroeppel, R.
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81 "Unless otherwise stated, all computer programs are in PDP-6/10
82 assembly language."
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84 ITEM 146: MUNCHING SQUARES
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86 Another simple display program. It is thought that this was
87 discovered by Jackson Wright on the RLE PDP-1 circa 1962.
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89 DATAI 2
90 ADDB 1,2
91 ROTC 2,-22
92 XOR 1,2
93 JRST .-4
94 2=X, 3=Y. Try things like 1001002 in data switches. This
95 also does interesting things with operations other than
96 XOR, and rotations other than -22. (Try IOR; AND; TSC;
97 FADR; FDV(!); ROT -14, -9, -20, ...)
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99 ITEM 147 (Schroeppel):
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101 Munching squares is just views of the graph Y = X XOR T for
102 consecutive values of T = time.
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104 ITEM 148 (Cohen, Beeler):
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106 A modification to munching squares which reveals them in
107 frozen states through opening and closing curtains: insert
108 FADR 2,1 before the XOR. Try data switches =
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110 4000,,4 1000,,2002 2000,,4 0,,1002
111 (Notation: <left half>,,<right half>)
112 Also try the FADR after the XOR, switches = 1001,,1.
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115 Copyright 1997 Tim Showalter.
116 Copyright 2004 Steven Hazel.
117 Copyright 1992-2008 Jamie Zawinski.
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119 Permission to use, copy, modify, distribute, and sell this software and
120 its documentation for any purpose is hereby granted without fee, pro‐
121 vided that the above copyright notice appear in all copies and that
122 both that copyright notice and this permission notice appear in sup‐
123 porting documentation. No representations are made about the suitabil‐
124 ity of this software for any purpose. It is provided "as is" without
125 express or implied warranty.
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129X Version 11 5.45-1.fc33 (10-Dec-2020) munch(6x)