1 <?xml version="1.0" encoding="ISO-8859-1"?>
3 <screensaver name="epicycle" _label="Epicycle">
7 <number id="delay" type="slider" arg="-delay %"
8 _label="Frame rate" _low-label="Low" _high-label="High"
9 low="0" high="100000" default="20000"
12 <number id="ncolors" type="slider" arg="-colors %"
13 _label="Number of colors" _low-label="Two" _high-label="Many"
14 low="1" high="255" default="100"/>
16 <number id="holdtime" type="slider" arg="-holdtime %"
17 _label="Linger" _low-label="1 second" _high-label="30 seconds"
18 low="1" high="30" default="2"/>
21 <number id="linewidth" type="spinbutton" arg="-linewidth %"
22 _label="Line thickness" low="1" high="50" default="4"/>
24 <number id="harmonics" type="spinbutton" arg="-harmonics %"
25 _label="Harmonics" low="1" high="20" default="8"/>
28 <!-- #### -color0 [red] -->
29 <!-- #### -colours [100] -->
30 <!-- #### -foreground [white] -->
31 <!-- #### -min_circles [2] -->
32 <!-- #### -max_circles [10] -->
33 <!-- #### -min_speed [0.003] -->
34 <!-- #### -max_speed [0.005] -->
35 <!-- #### -timestep [1.0] -->
36 <!-- #### -divisor_poisson [0.4] -->
37 <!-- #### -size_factor_min [1.05] -->
38 <!-- #### -size_factor_max [2.05] -->
40 <boolean id="showfps" _label="Show frame rate" arg-set="-fps"/>
43 This draws the path traced out by a point on the edge of a
44 circle. That circle rotates around a point on the rim of another
45 circle, and so on, several times. These were the basis for the
46 pre-heliocentric model of planetary motion.
48 http://en.wikipedia.org/wiki/Deferent_and_epicycle
50 Written by James Youngman; 1998.