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XScreenSaver(1) 								  XScreenSaver(1)

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  num-
	       ber (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 memThrot-
	       tle.

       -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  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, provided that the  above	copyright  notice
       appear in all copies and that both that copyright notice and this permission notice appear
       in supporting documentation.  No representations are made about the  suitability  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.

X Version 11				   06-Jul-2000				  XScreenSaver(1)
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