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    </vgroup>
  28
  29    <vgroup>
  30
  31     <select id="mode">
  32      <option id="random" _label="Delaunay or voronoi"/>
  33      <option _label="Delaunay" arg-set="-mode delaunay"/>
  34      <option _label="Voronoi"  arg-set="-mode voronoi"/>
  35     </select>
  36
  37     <xscreensaver-image />
  38
  39     <boolean id="fill"    _label="Fill screen" arg-unset="-no-fill-screen"/>
  40     <boolean id="outline" _label="Outline triangles" arg-unset="-no-outline"/>
  41     <boolean id="showfps" _label="Show frame rate" arg-set="-fps"/>
  42
  43     <xscreensaver-updater />
  44    </vgroup>
  45   </hgroup>
  46
  47   <_description>
  48 Converts an image to triangles using Delaunay tessellation, or to
  49 polygons using Voronoi tesselation, and animates the result at
  50 various depths.
  51
  52 More polygons are allocated to visually complex parts of the image.
  53 This is accomplished by first computing the first derivative of the
  54 image: the distance between each pixel and its neighbors (which is
  55 essentially edge detection or embossing).  Then the Delaunay or
  56 Voronoi control points are chosen by selecting those pixels whose
  57 distance value is above a certain threshold: those are the pixels that
  58 have the largest change in color/brightness.
  59
  60 https://en.wikipedia.org/wiki/Delaunay_triangulation
  61 https://en.wikipedia.org/wiki/Voronoi_diagram
  62 https://en.wikipedia.org/wiki/Tessellation
  63
  64 Written by Jamie Zawinski; 2014.
  65   </_description>
  66 </screensaver>