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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 <danfuzz@milk.com>, 06-Jul-2000.

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