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petri (1)
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    NAME
         petri - simulates mold growing in a petri dish
    
    SYNOPSIS
         petri  [-display  host:display.screen]  [-foreground  color]
         [-background  color]  [-window]  [-root]  [-mono] [-install]
         [-visual  visual]  [-delay  microseconds]  [-size   integer]
         [-mem-throttle  amount]  [-count  integer] [-originalcolors]
         [-diaglim   real]   [-anychan   real]   [-minorchan    real]
         [-instantdeathchan real] [-minlifespeed real] [-maxlifespeed
         real] [-mindeathspeed real] [-maxdeathspeed  real]  [-minli-
         fespan integer] [-maxlifespan integer]
    
    DESCRIPTION
         petri simulates mold growing in a petri dish  via  a  state-
         heavy  grid  of  automata  (vaguely like Conway's Life, only
         with much more state per cell).
    
    OPTIONS
         petri accepts the following options:
    
         -window Draw  on  a  newly-created  window.   This  is   the
                 default.
    
         -root   Draw on the root window.
    
         -mono   If on a color display, pretend we're on a monochrome
                 display.
    
         -install
                 Install a private colormap for the window.
    
         -visual visual
                 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 microseconds
                 The interframe delay, in microseconds.  Defaults  to
                 10000, resource delay.
    
         -size integer
                 The size  of  a  cell  in  pixels.  Defaults  to  4,
                 resource size.
    
         -mem-throttle amount
                 The maximum amount of memory to  consume,  specified
                 either  in megabytes (suffix "M"), kilobytes (suffix
                 "K"), or bytes (sans suffix). In order to  meet  the
                 memory  requirement, the cell size may be increased.
                 Defaults to 22M, resource memThrottle.
    
         -count integer
                 How  many  different  varieties  of  mold  to   grow
                 (including  Black  Death).   Defaults to 8, resource
                 count.
    
         -originalcolors
                 If specified, indicates that the colors used  should
                 be  the  artist's  original  choices (a fixed set of
                 primary and secondary colors). In this  case,  count
                 must  be 8 or less. Defaults to not specified (i.e.,
                 false), resource originalcolors.
    
         -diaglim real
                 The age limit for diagonal growth as a multiplier of
                 orthogonal  growth  (range  1..2).  1  means  square
                 growth, 1.414 (i.e.,  sqrt(2))  means  approximately
                 circular growth, 2 means diamond growth. Defaults to
                 1.414, resource diaglim.
    
         -anychan real
                 The chance (range 0..1) that at each iteration,  one
                 or  more new cells will be born. Defaults to 0.0015,
                 resource anychan.
    
         -minorchan real
                 The chance (range 0..1) that, given that  new  cells
                 will  be  born,  that  only two will be added (hence
                 being a minor cell birth event).  Defaults  to  0.5,
                 resource minorchan.
    
         -instantdeathchan real
                 The chance (range 0..1) that, given that  death  and
                 destruction will happen, that instead of using Black
                 Death  cells,  death  will   come   instantaneously.
                 Defaults to 0.2, resource instantdeathchan.
    
         -minlifespeed real
                 The minimum speed for living cells as a fraction  of
                 the maximum possible speed (range 0..1). Defaults to
                 0.04, resource minlifespeed.
    
         -maxlifespeed real
                 The maximum speed for living cells as a fraction  of
                 the maximum possible speed (range 0..1). Defaults to
                 0.13, resource maxlifespeed.
    
         -mindeathspeed real
                 The minimum speed for Black Death cells as  a  frac-
                 tion  of  the  maximum  possible speed (range 0..1).
                 Defaults to 0.42, resource mindeathspeed.
    
         -maxdeathspeed real
                 The maximum speed for Black Death cells as  a  frac-
                 tion  of  the  maximum  possible speed (range 0..1).
                 Defaults to 0.46, resource maxdeathspeed.
    
         -minlifespan integer
                 The minimum lifespan for a  colony,  in  iterations,
                 before  Black Death comes. Defaults to 500, resource
                 minlifespan.
    
         -maxlifespan integer
                 The maximum lifespan for a  colony,  in  iterations,
                 before Black Death comes. Defaults to 1500, resource
                 maxlifespan.
    
    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.
    
    X RESOURCES
         There are resource equivalents for each option, noted above.
    
    BUGS
         There are no known bugs in petri as of this writing.
    
    SEE ALSO
         xscreensaver(1)
    
    COPYRIGHT
         Copyright O 1992-2000 by Dan Bornstein.
    
         Permission to use, copy, modify, distribute, and  sell  this
         software  and  its  documentation  for any purpose is hereby
         granted without  fee,  provided  that  the  above  copyright
         notice  appear  in  all  copies and that both that copyright
         notice and this permission notice appear in supporting docu-
         mentation.   No representations are made about the suitabil-
         ity of this software for any purpose.  It  is  provided  "as
         is" without express or implied warranty.
    
    AUTHOR
         Dan Bornstein <[email protected]>, 06-Jul-2000.
    
    
    
    


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