git.hungrycats.org Git - xscreensaver/blob - local/man/cat.1/munch.1

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  64                                                                 1
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  70 XScreenSaver(1)                                   XScreenSaver(1)
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  72
  73 N\bNA\bAM\bME\bE
  74        munch - munching squares screen hack
  75
  76 S\bSY\bYN\bNO\bOP\bPS\bSI\bIS\bS
  77        d\bde\bec\bco\bo  [-display  _\bh_\bo_\bs_\bt_\b:_\bd_\bi_\bs_\bp_\bl_\ba_\by_\b._\bs_\bc_\br_\be_\be_\bn]  [-foreground _\bc_\bo_\bl_\bo_\br]
  78        [-background _\bc_\bo_\bl_\bo_\br] [-window] [-root]  [-mono]  [-install]
  79        [-visual _\bv_\bi_\bs_\bu_\ba_\bl] [-delay _\bs_\be_\bc_\bo_\bn_\bd_\bs] [-xor] [-noxor] [-shift]
  80        [-noshift] [-logminwidth _\bm_\bi_\bn_\bi_\bm_\bu_\bm _\bw_\bi_\bd_\bt_\bh]
  81
  82 D\bDE\bES\bSC\bCR\bRI\bIP\bPT\bTI\bIO\bON\bN
  83        The _\bm_\bu_\bn_\bc_\bh program preforms the munching squares hack until
  84        killed.   It picks square size, position, and gravity ran-
  85        domly; configurable options are listed below.
  86
  87        The munching squares hack cosists of drawing Y = X  XOR  T
  88        for  a range of X and T over and over until all the possi-
  89        ble combinations of X and T have come up.  It was  report-
  90        edly  discovered  by  Jackson  Wright  in  1962 and took 5
  91        instructions of PDP-6 code.
  92
  93 O\bOP\bPT\bTI\bIO\bON\bNS\bS
  94        _\bm_\bu_\bn_\bc_\bh accepts the following options:
  95
  96        -\b-w\bwi\bin\bnd\bdo\bow\bw Draw on  a  newly-created  window.   This  is  the
  97                default.
  98
  99        -\b-r\bro\boo\bot\bt   Draw on the root window.
 100
 101        -\b-m\bmo\bon\bno\bo   If   on  a  color  display,  pretend  we're  on  a
 102                monochrome display.
 103
 104        -\b-i\bin\bns\bst\bta\bal\bll\bl
 105                Install a private colormap for the window.
 106
 107        -\b-v\bvi\bis\bsu\bua\bal\bl _\bv_\bi_\bs_\bu_\ba_\bl
 108                Specify which visual to use.  Legal values are the
 109                name  of a visual class, or the id number (decimal
 110                or hex) of a specific visual.
 111
 112        -\b-d\bde\bel\bla\bay\by _\bs_\be_\bc_\bo_\bn_\bd_\bs
 113                How long to wait before starting over.  Default  5
 114                seconds.
 115
 116        -\b-x\bxo\bor\br    Use the XOR drawing function.  (Default.)
 117
 118        -\b-n\bno\bo-\b-x\bxo\bor\br Don't use the XOR drawing function.
 119
 120        -\b-s\bsh\bhi\bif\bft\bt  Start drawing the square at weird starting points.
 121                (Default.)
 122
 123        -\b-n\bno\bo-\b-s\bsh\bhi\bif\bft\bt
 124                Don't shift and start drawing the square at  weird
 125                starting points.
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 130 X Version 11                17-Jun-97                           1
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 136 XScreenSaver(1)                                   XScreenSaver(1)
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 139        -\b-l\blo\bog\bgm\bmi\bin\bnw\bwi\bid\bdt\bth\bh _\bm_\bi_\bn_\bi_\bm_\bu_\bm_\b-_\bw_\bi_\bd_\bt_\bh
 140                The  logarithm  (base  2) of the minimum with of a
 141                square (must be a power of 2, or some parts of the
 142                square aren't.)
 143
 144 E\bEN\bNV\bVI\bIR\bRO\bON\bNM\bME\bEN\bNT\bT
 145        D\bDI\bIS\bSP\bPL\bLA\bAY\bY to get the default host and display number.
 146
 147        X\bXE\bEN\bNV\bVI\bIR\bRO\bON\bNM\bME\bEN\bNT\bT
 148                to  get the name of a resource file that overrides
 149                the global resources stored in  the  RESOURCE_MAN-
 150                AGER property.
 151
 152 S\bSE\bEE\bE A\bAL\bLS\bSO\bO
 153        X\bX(1),                                     x\bxs\bsc\bcr\bre\bee\ben\bns\bsa\bav\bve\ber\br(1),
 154        h\bht\btt\btp\bp:\b:/\b//\b/w\bww\bww\bw.\b.i\bin\bnw\bwa\bap\bp.\b.c\bco\bom\bm/\b/p\bpd\bdp\bp1\b10\b0/\b/h\bhb\bba\bak\bke\ber\br/\b/h\bha\bak\bkm\bme\bem\bm/\b/h\bha\bak\bkm\bme\bem\bm.\b.h\bht\btm\bml\bl,\b,
 155        h\bht\btt\btp\bp:\b:/\b//\b/w\bww\bww\bw.\b.c\bco\bom\bme\bed\bdi\bia\ba.\b.c\bco\bom\bm/\b/H\bHo\bot\bt/\b/j\bja\bar\brg\bgo\bon\bn_\b_3\b3.\b.0\b0/\b/J\bJA\bAR\bRG\bGO\bON\bN_\b_M\bM/\b/M\bMU\bUN\bNC\bCH\bH-\b-
 156        S\bSQ\bQR\bR.\b.H\bHT\bTM\bML\bL
 157
 158 H\bHI\bIS\bST\bTO\bOR\bRY\bY
 159        Quoted from HAKMEM, for historical interest.  As that doc-
 160        ument  says,  "Unless  otherwise stated, all computer pro-
 161        grams are in PDP-6/10 assembly language."
 162
 163        ITEM 146: MUNCHING SQUARES
 164                Another simple display program. It is thought that
 165                this  was  discovered by Jackson Wright on the RLE
 166                PDP-1 circa 1962.
 167
 168                    DATAI 2
 169                    ADDB 1,2
 170                    ROTC 2,-22
 171                    XOR 1,2
 172                    JRST .-4
 173
 174                2=X,  3=Y.  Try  things  like  1001002   in   data
 175                switches.  This  also does interesting things with
 176                operations other than  XOR,  and  rotations  other
 177                than  -22.  (Try  IOR; AND; TSC; FADR; FDV(!); ROT
 178                -14, -9, -20, ...)
 179
 180        ITEM 147 (Schroeppel):
 181                Munching squares is just views of the graph Y =  X
 182                XOR T for consecutive values of T = time.
 183
 184        ITEM 148 (Cohen, Beeler):
 185                A  modification  to munching squares which reveals
 186                them in frozen states through opening and  closing
 187                curtains: insert FADR 2,1 before the XOR. Try data
 188                switches =
 189
 190                    4000,,4    1000,,2002    2000,,4    0,,1002
 191
 192                (Notation: <left half>,,<right half>)
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 196 X Version 11                17-Jun-97                           2
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 202 XScreenSaver(1)                                   XScreenSaver(1)
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 204
 205                Also try  the  FADR  after  the  XOR,  switches  =
 206                1001,,1.
 207
 208 C\bCO\bOP\bPY\bYR\bRI\bIG\bGH\bHT\bT
 209        Copyright  (C)  1997 by Tim Showalter.  Permission to use,
 210        copy, modify, distribute, and sell this software  and  its
 211        documentation  for  any  purpose is hereby granted without
 212        fee, provided that the above copyright  notice  appear  in
 213        all  copies  and  that both that copyright notice and this
 214        permission notice appear in supporting documentation.   No
 215        representations  are  made  about  the suitability of this
 216        software for any purpose.  It is provided "as is"  without
 217        express or implied warranty.
 218
 219 A\bAU\bUT\bTH\bHO\bOR\bR
 220        Tim  Showalter  <tjs@andrew.cmu.edu>,  17-Jun-97, based on
 221        what's in the Jargon File and stealing stuff from existing
 222        xscreensaver modules.
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 262 X Version 11                17-Jun-97                           3
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