DragonFly On-Line Manual Pages

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
               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.

       -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 (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                  5.34 (24-Oct-2015)                      petri(6)