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petri(6)		      XScreenSaver manual		      petri(6)

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] [-fps]

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.

       -fps    Display the current frame rate and CPU load.

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 © 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 <danfuzz@milk.com>, 06-Jul-2000.

X Version 11		      5.07 (10-Aug-2008)		      petri(6)
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