XScreenSaver(1)XScreenSaver(1)NAMEpetri - simulates mold growing in a petri dish
SYNOPSISpetri [-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] [-maxlife
speed real] [-mindeathspeed real] [-maxdeathspeed real]
[-minlifespan integer] [-maxlifespan integer]
DESCRIPTIONpetri 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).
OPTIONSpetri 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 (suf
fix "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 instanta
neously. 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 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 frac
tion 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 frac
tion 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_MAN
AGER 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 ALSOxscreensaver(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, 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 pro
vided "as is" without express or implied warranty.
AUTHOR
Dan Bornstein <danfuzz@milk.com>, 06-Jul-2000.
X Version 11 06-Jul-2000 XScreenSaver(1)
