1 <?xml version="1.0" encoding="ISO-8859-1"?>
3 <screensaver name="ifs" _label="IFS">
7 <video href="https://www.youtube.com/watch?v=0uOIrVFsECM"/>
9 <number id="delay" type="slider" arg="-delay %"
10 _label="Frame rate" _low-label="Low" _high-label="High"
11 low="0" high="100000" default="20000"
14 <number id="functions" type="slider" arg="-functions %"
15 _label="Number of functions" _low-label="2" _high-label="6"
16 low="2" high="6" default="3"/>
18 <number id="detail" type="slider" arg="-detail %"
19 _label="Detail" _low-label="Low" _high-label="High"
20 low="4" high="14" default="9"/>
23 On a 2.93 gHz iMac i7, I get these rates with -delay 0:
26 detail 4: barely visible
27 detail 5: 1000+ fps, looks like noise at -delay 0, ok at -delay 20000
37 With the default -delay, CPU load only starts causing the frame rate
38 to drop below 30 fps detail 12 or higher.
41 <number id="colors" type="slider" arg="-colors %"
42 _label="Number of colors" _low-label="2" _high-label="Many"
43 low="2" high="255" default="200" />
46 <boolean id="translate" _label="Translate" arg-unset="-no-translate"/>
47 <boolean id="scale" _label="Scale" arg-unset="-no-scale"/>
48 <boolean id="rotate" _label="Rotate" arg-unset="-no-rotate"/>
49 <boolean id="showfps" _label="Show frame rate" arg-set="-fps"/>
52 <xscreensaver-updater />
56 Clouds of iterated function systems spin and collide.
58 Note that the "Detail" parameter is exponential. Number of points
59 drawn is functions^detail.
61 https://en.wikipedia.org/wiki/Iterated_function_system
63 Written by Chris Le Sueur and Robby Griffin; 1997.