path: root/hacks/config/epicycle.xml

<?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.

https://en.wikipedia.org/wiki/Deferent_and_epicycle

Written by James Youngman; 1998.
  </_description>
</screensaver>