/usr/share/xscreensaver/config/petri.xml is in xscreensaver-data-extra 5.15-2ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 | <?xml version="1.0" encoding="ISO-8859-1"?>
<screensaver name="petri" _label="Petri">
<command arg="-root"/>
<vgroup>
<hgroup>
<number id="delay" type="slider" arg="-delay %"
_label="Frame rate" _low-label="Low" _high-label="High"
low="0" high="100000" default="10000"
convert="invert"/>
<boolean id="showfps" _label="Show frame rate" arg-set="-fps"/>
</hgroup>
</vgroup>
<hgroup>
<number id="size" type="spinbutton" arg="-size %"
_label="Cell size" low="0" high="100" default="2"/>
<number id="count" type="spinbutton" arg="-count %"
_label="Mold varieties" low="0" high="20" default="20"/>
</hgroup>
<hgroup>
<vgroup>
<number id="diaglim" type="slider" arg="-diaglim %"
_label="Colony shape" _low-label="Square" _high-label="Diamond"
low="1.0" high="2.0" default="1.414"
convert="invert"/>
<number id="anychan" type="slider" arg="-anychan %"
_label="Fertility" _low-label="Low" _high-label="High"
low="0.0" high="0.25" default="0.0015"/>
<number id="minorchan" type="slider" arg="-minorchan %"
_label="Offspring" _low-label="Few" _high-label="Many"
low="0.0" high="1.0" default="0.5"/>
<number id="instantdeathchan" type="slider" arg="-instantdeathchan %"
_label="Death comes" _low-label="Slowly" _high-label="Quickly"
low="0.0" high="1.0" default="0.2"/>
<number id="minlifespeed" type="slider" arg="-minlifespeed %"
_label="Minimum rate of growth" _low-label="Slow" _high-label="Fast"
low="0.0" high="1.0" default="0.04"/>
</vgroup>
<vgroup>
<number id="maxlifespeed" type="slider" arg="-maxlifespeed %"
_label="Maximum rate of growth" _low-label="Slow" _high-label="Fast"
low="0.0" high="1.0" default="0.13"/>
<number id="mindeathspeed" type="slider" arg="-mindeathspeed %"
_label="Minimum rate of death" _low-label="Slow" _high-label="Fast"
low="0.0" high="1.0" default="0.42"/>
<number id="maxdeathspeed" type="slider" arg="-maxdeathspeed %"
_label="Maximum rate of death" _low-label="Slow" _high-label="Fast"
low="0.0" high="1.0" default="0.46"/>
<number id="minlifespan" type="slider" arg="-minlifespan %"
_label="Minimum lifespan" _low-label="Short" _high-label="Long"
low="0" high="3000" default="500"/>
<number id="maxlifespan" type="slider" arg="-maxlifespan %"
_label="Maximum lifespan" _low-label="Short" _high-label="Long"
low="0" high="3000" default="1500"/>
</vgroup>
</hgroup>
<!-- #### -mem-throttle [22M] -->
<_description>
This simulates colonies of mold growing in a petri dish. Growing
colored circles overlap and leave spiral interference in their wake.
Written by Dan Bornstein; 1999.
</_description>
</screensaver>
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