/usr/share/xscreensaver/config/piecewise.xml is in xscreensaver-data-extra 5.15-3ubuntu1.
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 | <?xml version="1.0" encoding="ISO-8859-1"?>
<screensaver name="piecewise" _label="Piecewise">
<command arg="-root"/>
<hgroup>
<vgroup>
<number id="delay" type="slider" arg="-delay %"
_label="Frame rate" _low-label="Low" _high-label="High"
low="0" high="100000" default="10000"
convert="invert"/>
<number id="count" type="slider" arg="-count %"
_label="Count" _low-label="Few" _high-label="Many"
low="4" high="100" default="32"/>
<number id="colorspeed" type="slider" arg="-colorspeed %"
_label="Color shift" _low-label="Slow" _high-label="Fast"
low="0" high="100" default="10"/>
</vgroup>
<vgroup>
<number id="minradius" type="slider" arg="-minradius %"
_label="Minimum radius" _low-label="Small" _high-label="Large"
low="0.01" high="0.5" default="0.05"/>
<number id="maxradius" type="slider" arg="-maxradius %"
_label="Maximum radius" _low-label="Small" _high-label="Large"
low="0.01" high="0.5" default="0.2"/>
</vgroup>
</hgroup>
<boolean id="showfps" _label="Show frame rate" arg-set="-fps"/>
<_description>
This draws a bunch of moving circles which switch from visibility to
invisibility at intersection points.
Written by Geoffrey Irving; 2003.
</_description>
</screensaver>
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