.TH petri 6x "6.08 (10-Oct-2023)" "X Version 11" "XScreenSaver manual" .SH NAME petri \- simulates mold growing in a petri dish .SH SYNOPSIS .B petri [\-\-display \fIhost:display.screen\fP] [\-\-foreground \fIcolor\fP] [\-\-background \fIcolor\fP] [\-\-window] [\-\-root] [\-\-window\-id \fInumber\fP][\-\-mono] [\-\-install] [\-\-visual \fIvisual\fP] [\-\-delay \fImicroseconds\fP] [\-\-size \fIinteger\fP] [\-\-mem-throttle \fIamount\fP] [\-\-count \fIinteger\fP] [\-\-originalcolors] [\-\-diaglim \fIreal\fP] [\-\-anychan \fIreal\fP] [\-\-minorchan \fIreal\fP] [\-\-instantdeathchan \fIreal\fP] [\-\-minlifespeed \fIreal\fP] [\-\-maxlifespeed \fIreal\fP] [\-\-mindeathspeed \fIreal\fP] [\-\-maxdeathspeed \fIreal\fP] [\-\-minlifespan \fIinteger\fP] [\-\-maxlifespan \fIinteger\fP] [\-\-fps] .SH DESCRIPTION \fIpetri\fP 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). .SH OPTIONS .I petri accepts the following options: .TP 8 .B \-\-window Draw on a newly-created window. This is the default. .TP 8 .B \-\-root Draw on the root window. .TP 8 .B \-\-window\-id \fInumber\fP Draw on the specified window. .TP 8 .B \-\-mono If on a color display, pretend we're on a monochrome display. .TP 8 .B \-\-install Install a private colormap for the window. .TP 8 .B \-\-visual \fIvisual\fP Which visual to use. Legal values are the name of a visual class, or the id number (decimal or hex) of a specific visual. .TP 8 .B \-\-delay \fImicroseconds\fP The interframe delay, in microseconds. Defaults to 10000, resource \fIdelay\fP. .TP 8 .B \-\-size \fIinteger\fP The size of a cell in pixels. Defaults to 4, resource \fIsize\fP. .TP 8 .B \-\-mem-throttle \fIamount\fP 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 \fImemThrottle\fP. .TP 8 .B \-\-count \fIinteger\fP How many different varieties of mold to grow (including Black Death). Defaults to 8, resource \fIcount\fP. .TP 8 .B \-\-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 \fIoriginalcolors\fP. .TP 8 .B \-\-diaglim \fIreal\fP The age limit for diagonal growth as a multiplier of orthogonal growth (range 1..2). 1 means square growth, 1.414 (i.e., \fIsqrt(2)\fP) means approximately circular growth, 2 means diamond growth. Defaults to 1.414, resource \fIdiaglim\fP. .TP 8 .B \-\-anychan \fIreal\fP The chance (range 0..1) that at each iteration, one or more new cells will be born. Defaults to 0.0015, resource \fIanychan\fP. .TP 8 .B \-\-minorchan \fIreal\fP 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 \fIminorchan\fP. .TP 8 .B \-\-instantdeathchan \fIreal\fP 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 \fIinstantdeathchan\fP. .TP 8 .B \-\-minlifespeed \fIreal\fP The minimum speed for living cells as a fraction of the maximum possible speed (range 0..1). Defaults to 0.04, resource \fIminlifespeed\fP. .TP 8 .B \-\-maxlifespeed \fIreal\fP The maximum speed for living cells as a fraction of the maximum possible speed (range 0..1). Defaults to 0.13, resource \fImaxlifespeed\fP. .TP 8 .B \-\-mindeathspeed \fIreal\fP The minimum speed for Black Death cells as a fraction of the maximum possible speed (range 0..1). Defaults to 0.42, resource \fImindeathspeed\fP. .TP 8 .B \-\-maxdeathspeed \fIreal\fP The maximum speed for Black Death cells as a fraction of the maximum possible speed (range 0..1). Defaults to 0.46, resource \fImaxdeathspeed\fP. .TP 8 .B \-\-minlifespan \fIinteger\fP The minimum lifespan for a colony, in iterations, before Black Death comes. Defaults to 500, resource \fIminlifespan\fP. .TP 8 .B \-\-maxlifespan \fIinteger\fP The maximum lifespan for a colony, in iterations, before Black Death comes. Defaults to 1500, resource \fImaxlifespan\fP. .TP 8 .B \-\-fps Display the current frame rate and CPU load. .SH ENVIRONMENT .PP .TP 8 .B DISPLAY to get the default host and display number. .TP 8 .B XENVIRONMENT to get the name of a resource file that overrides the global resources stored in the RESOURCE_MANAGER property. .TP 8 .B XSCREENSAVER_WINDOW The window ID to use with \fI\-\-root\fP. .SH X RESOURCES There are resource equivalents for each option, noted above. .SH BUGS There are no known bugs in .I petri as of this writing. .SH SEE ALSO .BR xscreensaver (1) .SH COPYRIGHT Copyright \(co 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. .SH AUTHOR Dan Bornstein , 06-Jul-2000.