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munch(6) XScreenSaver manual munch(6) NAME munch - munching squares SYNOPSIS munch [--display host:display.screen] [--foreground color] [--back- ground color] [--window] [--root] [--window-id number][--mono] [--in- stall] [--visual visual] [--delay usecs] [--xor] [--noxor] [--clear number] [--simul number] [--classic | --mismunch | --random] [--fps] DESCRIPTION The munch program performs the munching squares hack. It picks square size, position, and gravity randomly. It also displays a creatively broken misimplementation of the classic algorithm. The munching squares hack consists of drawing Y = X XOR T for a range of X and T over and over until all the possible combinations of X and T have come up. It was reportedly discovered by Jackson Wright in 1962 and took 5 instructions of PDP-6 code. OPTIONS munch accepts the following options: --window Draw on a newly-created window. This is the default. --root Draw on the root window. --window-id number Draw on the specified window. --mono If on a color display, pretend we're on a monochrome display. --install Install a private colormap for the window. --visual visual Specify which visual to use. Legal values are the name of a visual class, or the id number (decimal or hex) of a specific visual. --delay usecs The delay between steps of the animation, in microseconds. De- fault: 2500. --xor Use the XOR drawing function. This is the default. --no-xor Don't use the XOR drawing function. --clear number Number of squares to misdraw before clearing the display. De- fault: 65. --simul number Number of squares to misdraw simultaneously. Default: 5. --classic Draw classic munching squares only. --mismunch Draw "mismunch" only. --random Do one or the other. --fps Display the current frame rate and CPU load. ENVIRONMENT DISPLAY to get the default host and display number. XENVIRONMENT to get the name of a resource file that overrides the global resources stored in the RESOURCE_MANAGER property. XSCREENSAVER_WINDOW The window ID to use with --root. HISTORY HAKMEM: MIT AI Memo 239, Feb. 29, 1972. Beeler, M., Gosper, R.W., and Schroeppel, R. "Unless otherwise stated, all computer programs are in PDP-6/10 assem- bly language." ITEM 146: MUNCHING SQUARES Another simple display program. It is thought that this was discovered by Jackson Wright on the RLE PDP-1 circa 1962. DATAI 2 ADDB 1,2 ROTC 2,-22 XOR 1,2 JRST .-4 2=X, 3=Y. Try things like 1001002 in data switches. This also does in- teresting things with operations other than XOR, and rotations other than -22. (Try IOR; AND; TSC; FADR; FDV(!); ROT -14, -9, -20, ...) ITEM 147 (Schroeppel): Munching squares is just views of the graph Y = X XOR T for consecutive values of T = time. ITEM 148 (Cohen, Beeler): A modification to munching squares which reveals them in frozen states through opening and closing curtains: insert FADR 2,1 before the XOR. Try data switches = 4000,,4 1000,,2002 2000,,4 0,,1002 (Notation: <left half>,,<right half>) Also try the FADR after the XOR, switches = 1001,,1. SEE ALSO X(1), xscreensaver(1), https://www.inwap.com/pdp10/hbaker/hakmem/hakmem.html COPYRIGHT Copyright (C) 1997 Tim Show alter. Copyright (C) 2004 Steven Hazel. Copyright (C) 1992-2008 Jamie Zawinski. Permission to use, copy, modify, distribute, and sell this software and its documentation for any purpose is hereby granted without fee, pro- vided that the above copyright notice appear in all copies and that both that copyright notice and this permission notice appear in sup- porting documentation. No representations are made about the suitabil- ity of this software for any purpose. It is provided "as is" without express or implied warranty. X Version 11 6.09 (07-Jun-2024) munch(6)
NAME | SYNOPSIS | DESCRIPTION | OPTIONS | ENVIRONMENT | HISTORY | SEE ALSO | COPYRIGHT
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