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XScreenSaver(6x)                                              XScreenSaver(6x)



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]  [-minlifespan  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  instant-
               deathchan.

       -minlifespeed real
               The minimum speed for living cells as a fraction of the maximum
               possible speed (range 0..1). Defaults to  0.04,  resource  min-
               lifespeed.

       -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 fraction 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 fraction 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 (C) 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, 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.

AUTHOR
       Dan Bornstein <danfuzzATmilk.com>, 06-Jul-2000.



X Version 11                  4.21 (01-Mar-2005)              XScreenSaver(6x)