1petri(6x) XScreenSaver manual petri(6x)
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6 petri - simulates mold growing in a petri dish
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9 petri [--display host:display.screen] [--foreground color] [--back‐
10 ground color] [--window] [--root] [--window-id number][--mono] [--in‐
11 stall] [--visual visual] [--delay microseconds] [--size integer]
12 [--mem-throttle amount] [--count integer] [--originalcolors] [--diaglim
13 real] [--anychan real] [--minorchan real] [--instantdeathchan real]
14 [--minlifespeed real] [--maxlifespeed real] [--mindeathspeed real]
15 [--maxdeathspeed real] [--minlifespan integer] [--maxlifespan integer]
16 [--fps]
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19 petri simulates mold growing in a petri dish via a state-heavy grid of
20 automata (vaguely like Conway's Life, only with much more state per
21 cell).
22
24 petri accepts the following options:
25 --window
27 Draw on a newly-created window. This is the default.
28 --root Draw on the root window.
30 --window-id number
32 Draw on the specified window.
33 --mono If on a color display, pretend we're on a monochrome display.
35 --install
37 Install a private colormap for the window.
38 --visual visual
40 Which visual to use. Legal values are the name of a visual
41 class, or the id number (decimal or hex) of a specific visual.
42 --delay microseconds
44 The interframe delay, in microseconds. Defaults to 10000, re‐
45 source delay.
46 --size integer
48 The size of a cell in pixels. Defaults to 4, resource size.
49 --mem-throttle amount
51 The maximum amount of memory to consume, specified either in
52 megabytes (suffix "M"), kilobytes (suffix "K"), or bytes (sans
53 suffix). In order to meet the memory requirement, the cell size
54 may be increased. Defaults to 22M, resource memThrottle.
55 --count integer
57 How many different varieties of mold to grow (including Black
58 Death). Defaults to 8, resource count.
59 --originalcolors
61 If specified, indicates that the colors used should be the
62 artist's original choices (a fixed set of primary and secondary
63 colors). In this case, count must be 8 or less. Defaults to not
64 specified (i.e., false), resource originalcolors.
65 --diaglim real
67 The age limit for diagonal growth as a multiplier of orthogonal
68 growth (range 1..2). 1 means square growth, 1.414 (i.e.,
69 sqrt(2)) means approximately circular growth, 2 means diamond
70 growth. Defaults to 1.414, resource diaglim.
71 --anychan real
73 The chance (range 0..1) that at each iteration, one or more new
74 cells will be born. Defaults to 0.0015, resource anychan.
75 --minorchan real
77 The chance (range 0..1) that, given that new cells will be
78 born, that only two will be added (hence being a minor cell
79 birth event). Defaults to 0.5, resource minorchan.
80 --instantdeathchan real
82 The chance (range 0..1) that, given that death and destruction
83 will happen, that instead of using Black Death cells, death
84 will come instantaneously. Defaults to 0.2, resource instant‐
85 deathchan.
86 --minlifespeed real
88 The minimum speed for living cells as a fraction of the maximum
89 possible speed (range 0..1). Defaults to 0.04, resource min‐
90 lifespeed.
91 --maxlifespeed real
93 The maximum speed for living cells as a fraction of the maximum
94 possible speed (range 0..1). Defaults to 0.13, resource
95 maxlifespeed.
96 --mindeathspeed real
98 The minimum speed for Black Death cells as a fraction of the
99 maximum possible speed (range 0..1). Defaults to 0.42, resource
100 mindeathspeed.
101 --maxdeathspeed real
103 The maximum speed for Black Death cells as a fraction of the
104 maximum possible speed (range 0..1). Defaults to 0.46, resource
105 maxdeathspeed.
106 --minlifespan integer
108 The minimum lifespan for a colony, in iterations, before Black
109 Death comes. Defaults to 500, resource minlifespan.
110 --maxlifespan integer
112 The maximum lifespan for a colony, in iterations, before Black
113 Death comes. Defaults to 1500, resource maxlifespan.
114 --fps Display the current frame rate and CPU load.
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118 DISPLAY to get the default host and display number.
119 XENVIRONMENT
121 to get the name of a resource file that overrides the global
122 resources stored in the RESOURCE_MANAGER property.
123 XSCREENSAVER_WINDOW
125 The window ID to use with --root.
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128 There are resource equivalents for each option, noted above.
129
131 There are no known bugs in petri as of this writing.
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134 xscreensaver(1)
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137 Copyright © 1992-2000 by Dan Bornstein.
138 Permission to use, copy, modify, distribute, and sell this software and
140 its documentation for any purpose is hereby granted without fee, pro‐
141 vided that the above copyright notice appear in all copies and that
142 both that copyright notice and this permission notice appear in sup‐
143 porting documentation. No representations are made about the suitabil‐
144 ity of this software for any purpose. It is provided "as is" without
145 express or implied warranty.
146
148 Dan Bornstein <danfuzz@milk.com>, 06-Jul-2000.
149X Version 11 6.08-1.fc38 (17-Oct-2023) petri(6x)