/usr/share/xscreensaver/config/attraction.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 84 | <?xml version="1.0" encoding="ISO-8859-1"?>
<screensaver name="attraction" _label="Attraction">
<command arg="-root"/>
<hgroup>
<select id="mode">
<option id="balls" _label="Balls"/>
<option id="lines" _label="Lines" arg-set="-mode lines"/>
<option id="tails" _label="Tails" arg-set="-mode tails"/>
<option id="polygons" _label="Polygons" arg-set="-mode polygons"/>
<option id="splines" _label="Splines" arg-set="-mode splines"/>
<option id="fsplines" _label="Filled splines"
arg-set="-mode filled-splines"/>
</select>
<select id="wallmode">
<option id="walls" _label="Bounce off walls"/>
<option id="nowalls" _label="Ignore screen edges" arg-set="-nowalls"/>
</select>
</hgroup>
<hgroup>
<vgroup>
<number id="points" type="spinbutton" arg="-points %"
_label="Ball count" low="0" high="200" default="0"/>
<number id="viscosity" type="slider" arg="-viscosity %"
_label="Environmental viscosity"
_low-label="Low" _high-label="High"
low="0.0" high="1.0" default="1.0"
convert="invert"/>
<number id="segments" type="slider" arg="-segments %"
_label="Trail length" _low-label="Short" _high-label="Long"
low="2" high="1000" default="500"/>
<number id="ncolors" type="slider" arg="-colors %"
_label="Number of colors" _low-label="Two" _high-label="Many"
low="1" high="255" default="200"/>
</vgroup>
<vgroup>
<number id="size" type="slider" arg="-size %"
_low-label="Ball mass" _high-label="High"
low="0" high="100" default="0"/>
<number id="threshold" type="slider" arg="-threshold %"
_label="Repulsion threshold"
_low-label="Small" _high-label="Large"
low="0" high="600" default="200"/>
<number id="delay" type="slider" arg="-delay %"
_label="Speed" _low-label="Slow" _high-label="Fast"
low="0" high="40000" default="10000"
convert="invert"/>
</vgroup>
</hgroup>
<hgroup>
<boolean id="orbit" _label="Orbital mode" arg-set="-orbit"/>
<number id="radius" type="spinbutton" arg="-radius %"
_label="Radius" low="0" high="1000" default="0"/>
<number id="vmult" type="slider" arg="-vmult %"
_low-label="Outward" _high-label="Inward"
low="-5.0" high="5.0" default="0.9"/>
</hgroup>
<!-- #### -vx [?] -->
<!-- #### -vy [?] -->
<!-- #### -glow -->
<!-- #### -nomaxspeed -->
<!-- #### -correct-bounce -->
<!-- #### -graphmode [none] -->
<boolean id="showfps" _label="Show frame rate" arg-set="-fps"/>
<_description>
Uses a simple simple motion model to generate many different display
modes. The control points attract each other up to a certain
distance, and then begin to repel each other. The
attraction/repulsion is proportional to the distance between any two
particles, similar to the strong and weak nuclear forces.
Written by Jamie Zawinski and John Pezaris; 1992.
</_description>
</screensaver>
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