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authorSimon Rettberg2024-09-06 14:42:37 +0200
committerSimon Rettberg2024-09-06 14:42:37 +0200
commitbadef32037f52f79abc1f1440b786cd71afdf270 (patch)
tree412b792d4cab4a7a110db82fcf74fe8a1ac55ec1 /hacks/config/epicycle.xml
parentDelete pre-6.00 files (diff)
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Diffstat (limited to 'hacks/config/epicycle.xml')
-rw-r--r--hacks/config/epicycle.xml68
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diff --git a/hacks/config/epicycle.xml b/hacks/config/epicycle.xml
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-<?xml version="1.0" encoding="ISO-8859-1"?>
-
-<screensaver name="epicycle" _label="Epicycle">
-
- <command arg="-root"/>
-
- <video href="https://www.youtube.com/watch?v=rpk3zxQxaR8"/>
-
- <number id="delay" type="slider" arg="-delay %"
- _label="Frame rate" _low-label="Low" _high-label="High"
- low="0" high="100000" default="20000"
- convert="invert"/>
-
- <number id="ncolors" type="slider" arg="-colors %"
- _label="Number of colors" _low-label="Two" _high-label="Many"
- low="1" high="255" default="100"/>
-
- <number id="holdtime" type="slider" arg="-holdtime %"
- _label="Linger" _low-label="1 second" _high-label="30 seconds"
- low="1" high="30" default="2"/>
-
- <hgroup>
- <number id="linewidth" type="spinbutton" arg="-linewidth %"
- _label="Line thickness" low="1" high="50" default="4"/>
-
- <number id="harmonics" type="spinbutton" arg="-harmonics %"
- _label="Harmonics" low="1" high="20" default="8"/>
- </hgroup>
-
- <!-- #### -color0 [red] -->
- <!-- #### -colours [100] -->
- <!-- #### -foreground [white] -->
- <!-- #### -min_circles [2] -->
- <!-- #### -max_circles [10] -->
- <!-- #### -min_speed [0.003] -->
- <!-- #### -max_speed [0.005] -->
- <!-- #### -timestep [1.0] -->
- <!-- #### -divisor_poisson [0.4] -->
- <!-- #### -size_factor_min [1.05] -->
- <!-- #### -size_factor_max [2.05] -->
-
- <boolean id="showfps" _label="Show frame rate" arg-set="-fps"/>
-
- <xscreensaver-updater />
-
- <_description>
-A pre-heliocentric model of planetary motion.
-
-This draws the path traced out by a point on the edge of a
-circle. That circle rotates around a point on the rim of another
-circle, and so on, several times.
-
-The geometry of epicycles was perfected by Hipparchus of Rhodes at some time
-around 125 B.C., 185 years after the birth of Aristarchus of Samos, the
-inventor of the heliocentric universe model. Hipparchus applied epicycles to
-the Sun and the Moon. Ptolemy of Alexandria went on to apply them to what was
-then the known universe, at around 150 A.D. Copernicus went on to apply them
-to the heliocentric model at the beginning of the sixteenth century. Johannes
-Kepler discovered that the planets actually move in elliptical orbits in about
-1602. The inverse-square law of gravity was suggested by Boulliau in 1645.
-Isaac Newton's Principia Mathematica was published in 1687, and proved that
-Kepler's laws derived from Newtonian gravitation.
-
-https://en.wikipedia.org/wiki/Deferent_and_epicycle
-
-Written by James Youngman; 1998.
- </_description>
-</screensaver>