Translations by Samir Ribić

This demonstrates a search algorithm designed for locating a source of odor in turbulent atmosphere. The searcher is able to sense the odor and determine local instantaneous wind direction. The goal is to find the source in the shortest mean time. http://en.wikipedia.org/wiki/Anemotaxis Written by Eugene Balkovsky; 2004.

Simulates an original Apple ][ Plus computer in all its 1979 glory. It also reproduces the appearance of display on a color television set of the period. In "Basic Programming Mode", a simulated user types in a BASIC program and runs it. In "Text Mode", it displays the output of a program, or the contents of a file or URL. In "Slideshow Mode", it chooses random images and displays them within the limitations of the Apple ][ display hardware. (Six available colors in hi-res mode!) On MacOS and Linux, this program is also a fully-functional VT100 emulator! Run it as an application instead of as a screen saver and you can use it as a terminal. http://en.wikipedia.org/wiki/Apple_II_series Written by Trevor Blackwell; 2003.

Simulates an original Apple ][ Plus computer in all its 1979 glory. It also reproduces the appearance of display on a color television set of the period. In "Basic Programming Mode", a simulated user types in a BASIC program and runs it. In "Text Mode", it displays the output of a program, or the contents of a file or URL. In "Slideshow Mode", it chooses random images and displays them within the limitations of the Apple ][ display hardware. (Six available colors in hi-res mode!) This program is also a fully-functional VT100 emulator! Run it as an application instead of as a screen saver and you can use it as a terminal. http://en.wikipedia.org/wiki/Apple_II_series Written by Trevor Blackwell; 2003.

Simulates an original Apple ][ Plus computer in all its 1979 glory. It also reproduces the appearance of display on a color television set of the period. In "Basic Programming Mode", a simulated user types in a BASIC program and runs it. In "Text Mode", it displays the output of a program, or the contents of a file or URL. In "Slideshow Mode", it chooses random images and displays them within the limitations of the Apple ][ display hardware. (Six available colors in hi-res mode!) On X11 systems, This program is also a fully-functional VT100 emulator. http://en.wikipedia.org/wiki/Apple_II_series Written by Trevor Blackwell; 2003.

GLaDOS

CompanionCube

The symptoms most commonly produced by Enrichment Center testing are superstition, perceiving inanimate objects as alive, and hallucinations. The Enrichment Center reminds you that the weighted companion cube will never threaten to stab you and, in fact, cannot speak. In the event that the Weighted Companion Cube does speak, the Enrichment Center urges you to disregard its advice. http://en.wikipedia.org/wiki/Portal_%28video_game%29 Written by Jamie Zawinski; 2011.

Bounce

Slow

Fast

Number of cubes

1

20

DNA Lounge Restaurant -- Bar -- Nightclub -- Cafe -- Est. 1985. 375 Eleventh Street San Francisco, CA 94103 http://www.dnalounge.com/ http://www.dnapizza.com/ Written by Jamie Zawinski; 2001.

DNA Lounge logo

DNA Pizza logo

DNA Lounge and DNA Pizza logos

Falling colored snowflake/flower shapes. http://en.wikipedia.org/wiki/Snowflake Written by Barry Dmytro; 2004.

Number of poles

0

31

Speed (of smallest disks)

1

20

Length of disk trails

0

10

Draws the 3D "digital rain" effect, as seen in the title sequence of "The Matrix". See also "xmatrix" for a 2D rendering of the similar effect that appeared on the computer monitors actually *in* the movie. http://en.wikipedia.org/wiki/Matrix_digital_rain Written by Jamie Zawinski; 2003.

Additive colors (transmitted light)

Subtractive colors (reflected light)

Hilbert

This draws the recursive Hilbert space-filling curve, in both 2D and 3D variants. It incrementally animates the growth and recursion to the maximum depth, then unwinds it back. The Hilbert path is a single contiguous line that can fill a volume without crossing itself. As a data structure, Hilbert paths are useful because ordering along the curve preserves locality: points that close together along the curve are also close together in space. The converse is often, but not always, true. The coloration reflects this. http://en.wikipedia.org/wiki/Hilbert_curve Written by Jamie Zawinski; 2011.

2D or 3D

2D

3D

Open or closed paths

Closed

Open

Recursion levels

2

10

Line thickness

Thin

Thick

Clouds of iterated function systems spin and collide. Note that the "Detail" parameter is exponential. Number of points drawn is functions^detail. http://en.wikipedia.org/wiki/Iterated_function_system Written by Chris Le Sueur and Robby Griffin; 1997.

This animates a Klein bottle, the 4D analog of a moebius strip. You can walk on the surface of the bottle or rotate it in 4D or walk on it while it rotates in 4D. Inspired by Thomas Banchoff's book "Beyond the Third Dimension: Geometry, Computer Graphics, and Higher Dimensions", Scientific American Library, 1990. http://en.wikipedia.org/wiki/Klein_bottle Written by Carsten Steger; 2008.

Draws a 3D Simulation a Lava Lite(r). Odd-shaped blobs of a mysterious substance are heated, slowly rise to the top of the bottle, and then drop back down as they cool. This simulation requires a fairly fast machine (both CPU and 3D performance.) "LAVA LITE(r) and the configuration of the LAVA(r) brand motion lamp are registered trademarks of Haggerty Enterprises, Inc. The configuration of the globe and base of the motion lamp are registered trademarks of Haggerty Enterprises, Inc. in the U.S.A. and in other countries around the world." http://en.wikipedia.org/wiki/Lava_lamp http://en.wikipedia.org/wiki/Metaballs http://en.wikipedia.org/wiki/Lavarand Written by Jamie Zawinski; 2002.

This emulates a 6502 microprocessor, and runs some example programs on it. The family of 6502 chips were used throughout the 70's and 80's in machines such as the Atari 2600, Commodore PET, VIC20 and C64, Apple ][, and the NES. Some example programs are included, and it can also read in an assembly file as input. Original JavaScript Version by Stian Soreng: http://www.6502asm.com/. Ported to XScreenSaver by Jeremy English. Written by Stian Soreng and Jeremy English; 2007.

This generates random mazes, with three different algorithms: Kruskal, Prim, and a depth-first recursive backtracker. It also solves them. Backtracking and look-ahead paths are displayed in different colors. http://en.wikipedia.org/wiki/Maze_generation_algorithm http://en.wikipedia.org/wiki/Maze_solving_algorithm Written by Martin Weiss, Dave Lemke, Jim Randell, Jamie Zawinski, Johannes Keukelaar, and Zack Weinberg; 1985.