git.hungrycats.org Git - xscreensaver/blob - hacks/config/tessellimage.xml

   1 <?xml version="1.0" encoding="ISO-8859-1"?>
   2
   3 <screensaver name="tessellimage" _label="Tessellimage">
   4
   5   <command arg="-root"/>
   6
   7   <video href="https://www.youtube.com/watch?v=JNgybysnYU8"/>
   8
   9   <hgroup>
  10    <vgroup>
  11     <number id="delay" type="slider" arg="-delay %"
  12             _label="Frame rate" _low-label="Low" _high-label="High"
  13             low="0" high="100000" default="30000"
  14             convert="invert"/>
  15
  16     <number id="duration2" type="slider" arg="-duration2 %"
  17             _label="Speed" _low-label="0.1 second" _high-label="4 seconds"
  18             low="0.1" high="4.0" default="0.4"/>
  19
  20     <number id="duration" type="slider" arg="-duration %"
  21             _label="Duration" _low-label="10 seconds" _high-label="10 minutes"
  22             low="10" high="600" default="120"/>
  23
  24     <number id="depth" type="slider" arg="-max-depth %"
  25             _label="Complexity" _low-label="Shallow" _high-label="Deep"
  26             low="1000" high="100000" default="30000"/>
  27
  28    </vgroup>
  29
  30    <vgroup>
  31     <xscreensaver-image />
  32
  33     <boolean id="fill"    _label="Fill screen" arg-unset="-no-fill-screen"/>
  34     <boolean id="outline" _label="Outline triangles" arg-unset="-no-outline"/>
  35     <boolean id="showfps" _label="Show frame rate" arg-set="-fps"/>
  36
  37     <xscreensaver-updater />
  38    </vgroup>
  39   </hgroup>
  40
  41   <_description>
  42 Converts an image to triangles using Delaunay tessellation, and
  43 animates the result at various depths.
  44
  45 More triangles are allocated to visually complex parts of the image.
  46 This is accomplished by first computing the first derivative of the
  47 image: the distance between each pixel and its neighbors (which is
  48 essentially edge detection or embossing).  Then the Delaunay control
  49 points are chosen by selecting those pixels whose distance value is
  50 above a certain threshold: those are the pixels that have the largest
  51 change in color/brightness.
  52
  53 https://en.wikipedia.org/wiki/Delaunay_triangulation
  54
  55 Written by Jamie Zawinski; 2014.
  56   </_description>
  57 </screensaver>