Provided by: xscreensaver-data-extra_5.08-0ubuntu3_i386 bug
 

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.
        There are resource equivalents for each option, noted above.
 

BUGS

        There are no known bugs in petri as of this writing.
        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  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.