1petri(6x)                     XScreenSaver manual                    petri(6x)
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NAME

6       petri - simulates mold growing in a petri dish
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SYNOPSIS

9       petri  [-display  host:display.screen] [-foreground color] [-background
10       color] [-window] [-root] [-mono] [-install]  [-visual  visual]  [-delay
11       microseconds]  [-size  integer] [-mem-throttle amount] [-count integer]
12       [-originalcolors] [-diaglim real]  [-anychan  real]  [-minorchan  real]
13       [-instantdeathchan  real]  [-minlifespeed  real]  [-maxlifespeed  real]
14       [-mindeathspeed  real]  [-maxdeathspeed  real]  [-minlifespan  integer]
15       [-maxlifespan integer] [-fps]
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DESCRIPTION

18       petri  simulates mold growing in a petri dish via a state-heavy grid of
19       automata (vaguely like Conway's Life, only with  much  more  state  per
20       cell).
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OPTIONS

23       petri accepts the following options:
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25       -window Draw on a newly-created window.  This is the default.
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27       -root   Draw on the root window.
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29       -mono   If on a color display, pretend we're on a monochrome display.
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31       -install
32               Install a private colormap for the window.
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34       -visual visual
35               Which  visual  to  use.   Legal values are the name of a visual
36               class, or the id number (decimal or hex) of a specific visual.
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38       -delay microseconds
39               The interframe  delay,  in  microseconds.  Defaults  to  10000,
40               resource delay.
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42       -size integer
43               The size of a cell in pixels. Defaults to 4, resource size.
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45       -mem-throttle amount
46               The  maximum  amount  of memory to consume, specified either in
47               megabytes (suffix "M"), kilobytes (suffix "K"), or bytes  (sans
48               suffix). In order to meet the memory requirement, the cell size
49               may be increased.  Defaults to 22M, resource memThrottle.
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51       -count integer
52               How many different varieties of mold to grow  (including  Black
53               Death).  Defaults to 8, resource count.
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55       -originalcolors
56               If  specified,  indicates  that  the  colors used should be the
57               artist's original choices (a fixed set of primary and secondary
58               colors). In this case, count must be 8 or less. Defaults to not
59               specified (i.e., false), resource originalcolors.
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61       -diaglim real
62               The age limit for diagonal growth as a multiplier of orthogonal
63               growth  (range  1..2).  1  means  square  growth,  1.414 (i.e.,
64               sqrt(2)) means approximately circular growth, 2  means  diamond
65               growth. Defaults to 1.414, resource diaglim.
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67       -anychan real
68               The chance (range 0..1) that at each iteration, one or more new
69               cells will be born. Defaults to 0.0015, resource anychan.
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71       -minorchan real
72               The chance (range 0..1) that, given  that  new  cells  will  be
73               born,  that  only  two  will be added (hence being a minor cell
74               birth event).  Defaults to 0.5, resource minorchan.
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76       -instantdeathchan real
77               The chance (range 0..1) that, given that death and  destruction
78               will  happen,  that  instead  of using Black Death cells, death
79               will come instantaneously.  Defaults to 0.2, resource  instant‐
80               deathchan.
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82       -minlifespeed real
83               The minimum speed for living cells as a fraction of the maximum
84               possible speed (range 0..1). Defaults to  0.04,  resource  min‐
85               lifespeed.
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87       -maxlifespeed real
88               The maximum speed for living cells as a fraction of the maximum
89               possible  speed  (range  0..1).  Defaults  to  0.13,   resource
90               maxlifespeed.
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92       -mindeathspeed real
93               The  minimum  speed  for Black Death cells as a fraction of the
94               maximum possible speed (range 0..1). Defaults to 0.42, resource
95               mindeathspeed.
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97       -maxdeathspeed real
98               The  maximum  speed  for Black Death cells as a fraction of the
99               maximum possible speed (range 0..1). Defaults to 0.46, resource
100               maxdeathspeed.
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102       -minlifespan integer
103               The  minimum lifespan for a colony, in iterations, before Black
104               Death comes. Defaults to 500, resource minlifespan.
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106       -maxlifespan integer
107               The maximum lifespan for a colony, in iterations, before  Black
108               Death comes. Defaults to 1500, resource maxlifespan.
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110       -fps    Display the current frame rate and CPU load.
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ENVIRONMENT

113       DISPLAY to get the default host and display number.
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115       XENVIRONMENT
116               to  get  the  name of a resource file that overrides the global
117               resources stored in the RESOURCE_MANAGER property.
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X RESOURCES

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

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

126       xscreensaver(1)
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129       Copyright © 1992-2000 by Dan Bornstein.
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131       Permission to use, copy, modify, distribute, and sell this software and
132       its  documentation  for any purpose is hereby granted without fee, pro‐
133       vided that the above copyright notice appear in  all  copies  and  that
134       both  that  copyright  notice and this permission notice appear in sup‐
135       porting documentation.  No representations are made about the suitabil‐
136       ity  of  this software for any purpose.  It is provided "as is" without
137       express or implied warranty.
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AUTHOR

140       Dan Bornstein <danfuzz@milk.com>, 06-Jul-2000.
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144X Version 11               5.44-2.fc32 (16-Apr-2020)                 petri(6x)
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