! a screen saver and locker for the X window system
! by Jamie Zawinski
!
-! version 3.19
-! 30-Oct-99
+! version 3.20
+! 12-Nov-99
!
! See "man xscreensaver" for more info. The latest version is always
! available at http://www.jwz.org/xscreensaver/
! edit the current list of programs interactively, try out the various modes,
! and change other parameters. See the man page for details.
!
-*programs: qix -root -solid -delay 0 -segments 100 \n\
- qix -root -count 4 -solid -transparent \n\
- qix -root -count 5 -solid -transparent -linear \
- -segments 250 -size 100 \n\
- attraction -root -mode balls \n\
- attraction -root -mode lines -points 3 -segments 200 \n\
- attraction -root -mode splines -segments 300 \n\
- attraction -root -mode lines -radius 300 \
- -orbit -vmult 0.5 \n\
- pyro -root \n\
- helix -root \n\
- pedal -root \n\
- rorschach -root -offset 7 \n\
- hopalong -root \n\
- greynetic -root \n\
- xroger -root \n\
- imsmap -root \n\
- slidescreen -root \n\
- decayscreen -root \n\
- jigsaw -root \n\
- blitspin -root -grab \n\
- slip -root \n\
- distort -root \n\
- spotlight -root \n\
- hypercube -root \n\
- halo -root \n\
- maze -root \n\
- noseguy -root \n\
- flame -root \n\
- lmorph -root \n\
- deco -root \n\
- moire -root \n\
- moire2 -root \n\
- lightning -root \n\
- strange -root \n\
- spiral -root \n\
- laser -root \n\
- grav -root \n\
- grav -root -trail -decay \n\
- drift -root \n\
- ifs -root \n\
- julia -root \n\
- penrose -root \n\
- sierpinski -root \n\
- braid -root \n\
- galaxy -root \n\
- bouboule -root \n\
- swirl -root \n\
- flag -root \n\
- sphere -root \n\
- forest -root \n\
- lisa -root \n\
- lissie -root \n\
- goop -root \n\
- starfish -root \n\
- starfish -root -blob \n\
- munch -root \n\
- fadeplot -root \n\
- coral -root \n\
- mountain -root \n\
- triangle -root \n\
- worm -root \n\
- rotor -root \n\
- ant -root \n\
- demon -root \n\
- loop -root \n\
- vines -root \n\
- kaleidescope -root \n\
- xjack -root \n\
- - xlyap -root -randomize \n\
- cynosure -root \n\
- flow -root \n\
- epicycle -root \n\
- interference -root \n\
- truchet -root -randomize \n\
- bsod -root \n\
- crystal -root \n\
- discrete -root \n\
- kumppa -root \n\
- rd-bomb -root \n\
- rd-bomb -root -speed 1 -size 0.1 \n\
- sonar -root \n\
- t3d -root \n\
- penetrate -root \n\
- deluxe -root \n\
- compass -root \n\
- squiral -root \n\
- xflame -root \n\
- wander -root \n\
- wander -root -advance 0 -size 10 -circles True \
- -length 10000 -reset 100000 \n\
- critical -root \n\
- phosphor -root \n\
- xmatrix -root \n\
- petri -root -size 1 -count 20 \n\
- petri -root -minlifespeed 0.02 -maxlifespeed 0.03 \
- -minlifespan 1 -maxlifespan 1 -instantdeathchan 0 \
- -minorchan 0 -anychan 0.3 \n\
- shadebobs -root \n\
- ccurve -root \n\
- blaster -root \n\
- bumps -root \n\
- default-n: webcollage -root \n\
- - default-n: webcollage -root -filter 'vidwhacker -stdin -stdout' \n\
- - default-n: vidwhacker -root \n\
- \
- mono: rocks -root \n\
- color: rocks -root -fg darksalmon \n\
- \
- mono: qix -root -linear -count 5 -size 200 -spread 30 \
- -segments 75 -solid -xor \n\
- \
- color: attraction -root -mode polygons \n\
- color: attraction -root -mode filled-splines -segments 0 \n\
- color: attraction -root -glow -points 10 \n\
- color: bubbles -root \n\
- \
-@GL_KLUDGE@ GL: gears -root \n\
-@GL_KLUDGE@ GL: superquadrics -root \n\
-@GL_KLUDGE@ GL: morph3d -root \n\
-@GL_KLUDGE@ GL: cage -root \n\
-@GL_KLUDGE@ GL: moebius -root \n\
-@GL_KLUDGE@ GL: stairs -root \n\
-@GL_KLUDGE@ GL: pipes -root \n\
-@GL_KLUDGE@ GL: sproingies -root \n\
-@GL_KLUDGE@ GL: rubik -root \n\
-@GL_KLUDGE@ GL: atlantis -root \n\
-@GL_KLUDGE@ GL: lament -root \n\
-@GL_KLUDGE@ GL: bubble3d -root \n\
-@GL_KLUDGE@ GL: glplanet -root \n\
-@GL_KLUDGE@ GL: pulsar -root \n\
- - GL: pulsar -root -texture -mipmap -texture_quality \
- -light -fog \n\
-@GLE_KLUDGE@ GL: extrusion -root \n
+*programs: \
+ "Qix (solid)" qix -root -solid -delay 0 -segments 100 \n\
+ "Qix (transparent)" qix -root -count 4 -solid -transparent \n\
+ "Qix (linear)" qix -root -count 5 -solid -transparent \
+ -linear -segments 250 -size 100 \n\
+ "Attraction (balls)" attraction -root -mode balls \n\
+ "Attraction (lines)" attraction -root -mode lines -points 3 \
+ -segments 200 \n\
+ "Attraction (splines)" attraction -root -mode splines -segments \
+ 300 \n\
+ "Attraction (orbital)" attraction -root -mode lines -radius 300 \
+ -orbit -vmult 0.5 \n\
+ pyro -root \n\
+ helix -root \n\
+ pedal -root \n\
+ rorschach -root -offset 7 \n\
+ hopalong -root \n\
+ greynetic -root \n\
+ xroger -root \n\
+ imsmap -root \n\
+ slidescreen -root \n\
+ decayscreen -root \n\
+ jigsaw -root \n\
+ blitspin -root -grab \n\
+ slip -root \n\
+ distort -root \n\
+ spotlight -root \n\
+ "Ripples (oily)" ripples -root -oily -light 2 \n\
+ "Ripples (stir)" ripples -root -oily -light 2 -stir \n\
+ "Ripples (desktop)" ripples -root -water -light 6 \n\
+ hypercube -root \n\
+ halo -root \n\
+ maze -root \n\
+ noseguy -root \n\
+ flame -root \n\
+ lmorph -root \n\
+ deco -root \n\
+ moire -root \n\
+ moire2 -root \n\
+ lightning -root \n\
+ strange -root \n\
+ spiral -root \n\
+ laser -root \n\
+ grav -root \n\
+ "Grav (trails)" grav -root -trail -decay \n\
+ drift -root \n\
+ ifs -root \n\
+ julia -root \n\
+ penrose -root \n\
+ sierpinski -root \n\
+ braid -root \n\
+ galaxy -root \n\
+ bouboule -root \n\
+ swirl -root \n\
+ flag -root \n\
+ sphere -root \n\
+ forest -root \n\
+ lisa -root \n\
+ lissie -root \n\
+ goop -root -max-velocity 0.5 -elasticity \
+ 0.9 \n\
+ starfish -root \n\
+ "Starfish (blob)" starfish -root -blob \n\
+ munch -root \n\
+ fadeplot -root \n\
+ coral -root -delay 0 \n\
+ mountain -root \n\
+ triangle -root -delay 1 \n\
+ worm -root \n\
+ rotor -root \n\
+ ant -root \n\
+ demon -root \n\
+ loop -root \n\
+ vines -root \n\
+ kaleidescope -root \n\
+ xjack -root \n\
+ xlyap -root -randomize \n\
+ cynosure -root \n\
+ flow -root \n\
+ epicycle -root \n\
+ interference -root \n\
+ truchet -root -randomize \n\
+ bsod -root \n\
+ crystal -root \n\
+ discrete -root \n\
+ kumppa -root \n\
+ rd-bomb -root \n\
+ "RD-Bomb (mobile)" rd-bomb -root -speed 1 -size 0.1 \n\
+ sonar -root \n\
+ t3d -root \n\
+ penetrate -root \n\
+ deluxe -root \n\
+ compass -root \n\
+ squiral -root \n\
+ xflame -root \n\
+ wander -root \n\
+ "Wander (spots)" wander -root -advance 0 -size 10 -circles \
+ True -length 10000 -reset 100000 \n\
+ critical -root \n\
+ phosphor -root \n\
+ xmatrix -root \n\
+ petri -root -size 2 -count 20 \n\
+ "Petri 2" petri -root -minlifespeed 0.02 \
+ -maxlifespeed 0.03 -minlifespan 1 \
+ -maxlifespan 1 -instantdeathchan 0 \
+ -minorchan 0 -anychan 0.3 \n\
+ shadebobs -root \n\
+ ccurve -root \n\
+ blaster -root \n\
+ bumps -root \n\
+ default-n: webcollage -root \n\
+ default-n: "WebCollage (whacked)" \
+ webcollage -root -filter \
+ 'vidwhacker -stdin -stdout' \n\
+- default-n: vidwhacker -root \n\
+ \
+- mono: "Rocks (mono)" rocks -root \n\
+ color: "Rocks (color)" rocks -root -fg darksalmon \n\
+- mono: "Qix (xor)" qix -root -linear -count 5 -size 200 \
+ -spread 30 -segments 75 -solid -xor \n\
+ color: "Attraction (poly)" attraction -root -mode polygons \n\
+- color: "Attraction (filled)" attraction -root -mode filled-splines \
+ -segments 0 \n\
+- Color: "Attraction (glow)" attraction -root -glow -points 10 \n\
+ color: bubbles -root \n\
+ \
+@GL_KLUDGE@ GL: gears -root \n\
+@GL_KLUDGE@ GL: superquadrics -root \n\
+@GL_KLUDGE@ GL: morph3d -root \n\
+@GL_KLUDGE@ GL: cage -root \n\
+@GL_KLUDGE@ GL: moebius -root \n\
+@GL_KLUDGE@ GL: stairs -root \n\
+@GL_KLUDGE@ GL: pipes -root \n\
+@GL_KLUDGE@ GL: sproingies -root \n\
+@GL_KLUDGE@ GL: rubik -root \n\
+@GL_KLUDGE@ GL: atlantis -root \n\
+@GL_KLUDGE@ GL: lament -root \n\
+@GL_KLUDGE@ GL: bubble3d -root \n\
+@GL_KLUDGE@ GL: glplanet -root \n\
+@GL_KLUDGE@ GL: pulsar -root \n\
+- GL: "Pulsar (textures)" \
+ pulsar -root -texture -mipmap \
+ -texture_quality -light -fog \n\
+@GLE_KLUDGE@GL: extrusion -root \n\
+@GL_KLUDGE@ GL: sierpinski3d -root \n\
! Some other programs that you might want to track down (these work as
! XScreenSaver helpers, but are not distributed with it):
!
-! xdaliclock -root -builtin2 \n\
-! xswarm -r 2>&- \n\
-! xwave -root \n\
-! xbouncebits ... \n\
-! ico -r -faces -sleep 1 -obj ico \n\
-! xsplinefun \n\
-! xmountains -b -M \n\
-! color: xfishtank -c black -d -r 2 \n\
+! xdaliclock -root -builtin2 \n\
+! xswarm -r 2>&- \n\
+! xwave -root \n\
+! xbouncebits ... \n\
+! ico -r -faces -sleep 1 -obj ico \n\
+! xsplinefun \n\
+! xmountains -b -M \n\
+! color: xfishtank -c black -d -r 2 \n\
!
! xtacy is ok, but it only works on the default visual. We can satisfy
! that constraint like so:
!
-! default: xtacy -root -delay 100 -funky -number 3 \n\
-! default: xtacy -root -delay 100 -gravity \n\
-! default: xtacy -root -delay 100 -mixer \n\
-! default: xtacy -root -delay 100 -taffy -pal 4 \n\
+! default: "Xtacy (funky)" xtacy -root -delay 100 -funky -number 3 \n\
+! default: "Xtacy (grav)" xtacy -root -delay 100 -gravity \n\
+! default: "Xtacy (mixer)" xtacy -root -delay 100 -mixer \n\
+! default: "Xtacy (taffy)" xtacy -root -delay 100 -taffy -pal 4 \n\
!
! To display a randomized slideshow of images, you can do something like this:
!
-! default-n: xv -root -rmode 5 -random -viewonly -wloop \
-! -wait 30 $HOME/bitmaps/*.jpg \n\
+! default-n: "Slideshow" xv -root -rmode 5 -random -viewonly \
+! -wloop -wait 30 $HOME/bitmaps/*.jpg \n\
!
! or, if you prefer "xli" to "xv", like this: (but note that xli's "-delay"
! option doesn't work in conjunction with "-onroot", so you need to add a
! line for each image individually... "xv" is better in this respect.)
!
-! default-n: xli -quiet -onroot -center -border black \
-! $HOME/bitmaps/pic1.jpg \n\
-! default-n: xli -quiet -onroot -center -border black \
-! $HOME/bitmaps/pic2.jpg \n\
-! default-n: xli -quiet -onroot -center -border black \
-! $HOME/bitmaps/pic3.jpg \n\
+! default-n: xli -quiet -onroot -center -border black \
+! $HOME/bitmaps/pic1.jpg \n\
+! default-n: xli -quiet -onroot -center -border black \
+! $HOME/bitmaps/pic2.jpg \n\
+! default-n: xli -quiet -onroot -center -border black \
+! $HOME/bitmaps/pic3.jpg \n\
!
! Note that we've used "default-n" as the visual name, rather than just
! "default": this means "default visual, no install", that is, it's like
*warning_dialog*Command.vertDistance: 20
*warning_dialog*Command.internalWidth: 20
*warning_dialog*Command.internalHeight: 5
+
+
+!=============================================================================
+!
+! Online documentation for xscreensaver-demo.
+!
+!=============================================================================
+
+! sanity check -- hands off.
+*hacks.documentation.isInstalled: True
+
+*hacks.grav.documentation: \
+This program draws a simple orbital simulation. If you turn on \
+trails, it looks kind of like a cloud-chamber photograph. Written by \
+Greg Bowering.
+
+*hacks.qix.documentation: \
+This is the swiss army chainsaw of qix programs. It bounces a series \
+of line segments around the screen, and uses variations on this basic \
+motion pattern to produce all sorts of different presentations: line \
+segments, filled polygons, overlapping translucent areas... Written \
+by Jamie Zawinski.
+
+*hacks.attraction.documentation: \
+Like qix, this uses a simple simple motion model to generate many \
+different display modes. The control points attract each other up to \
+a certain distance, and then begin to repel each other. The \
+attraction/repulsion is proportional to the distance between any two \
+particles, similar to the strong and weak nuclear forces. \
+ \n\n\
+One of the most interesting ways to watch this hack is simply as \
+bouncing balls, because their motions and interactions with each \
+other are so odd. Sometimes two balls will get into a tight orbit \
+around each other, to be interrupted later by a third, or by the edge \
+of the screen. It looks quite chaotic. \
+ \n\n\
+Written by Jamie Zawinski, based on Lisp code by John Pezaris.
+
+*hacks.pyro.documentation: \
+Pyro draws exploding fireworks. Blah blah blah. Written by Jamie \
+Zawinski.
+
+*hacks.helix.documentation: \
+This repeatedly generates spirally string-art-ish patterns. Written \
+by Jamie Zawinski.
+
+*hacks.pedal.documentation: \
+This is sort of a combination spirograph/string-art. It generates a \
+large, complex polygon, and lets the X server do the bulk of the work \
+by giving it an even/odd winding rule. Written by Dale Moore, based \
+on some ancient PDP-11 code.
+
+*hacks.rorschach.documentation: \
+This generates random inkblot patterns. The algorithm is deceptively \
+simple for how well it works; it merely walks a dot around the screen \
+randomly, and then reflects the image horizontally, vertically, or \
+both. Any deep-seated neurotic tendencies which this program reveals \
+are your own problem. Written by Jamie Zawinski.
+
+*hacks.hopalong.documentation: \
+This draws lacy fractal patterns, based on iteration in the imaginary \
+plane, from a 1986 Scientific American article. Mostly written by \
+Patrick Naughton.
+
+*hacks.greynetic.documentation: \
+This draws random colored and stippled rectangles. Written by Jamie \
+Zawinski.
+
+*hacks.xroger.documentation: \
+The XScreenSaver logo. Don't you hate it? So do I. Would you like \
+to design a new logo for XScreenSaver? If so, send jwz your \
+submissions.
+
+*hacks.imsmap.name: IMSmap
+*hacks.imsmap.documentation: \
+This generates random cloud-like patterns. It looks quite different \
+in monochrome and color. The basic idea is to take four points on \
+the edge of the image, and assign each a random ``elevation''. Then \
+find the point between them, and give it a value which is the average \
+of the other four, plus some small random offset. Then coloration is \
+done based on elevation. \
+ \n\n\
+The color selection is done by binding the elevation to either hue, \
+saturation, or brightness, and assigning random values to the others. \
+The ``brightness'' mode tends to yield cloudlike patterns, and the \
+others tend to generate images that look like heat-maps or CAT-scans. \
+Written by Juergen Nickelsen and Jamie Zawinski.
+
+*hacks.slidescreen.name: SlideScreen
+*hacks.slidescreen.documentation: \
+This grabs an image of whatever is on your screen, divides it into a \
+grid, and then randomly shuffles the squares around as if it was one \
+of those annoying ``16-puzzle'' games, where there is a grid of \
+squares, one of which is missing. I hate trying to solve those \
+puzzles, but watching one permute itself is more amusing. Written by \
+Jamie Zawinski.
+
+*hacks.decayscreen.name: DecayScreen
+*hacks.decayscreen.documentation: \
+This grabs an image of whatever is on your screen, and makes it melt. \
+You've no doubt seen this effect before, but no screensaver would \
+really be complete without it. It works best if there's something \
+colorful visible. Warning, if the effect continues after the screen \
+saver is off, seek medical attention. Written by David Wald and \
+Vivek Khera. \
+ \n\n\
+A number of these screenhacks have the ability to take an image of \
+your desktop and manipulate it in some way. On SGI systems, these \
+programs are able to (at random) pull their source image from the \
+system's video input instead! This works nicely if you leave some \
+some random television station plugged in.
+
+*hacks.jigsaw.documentation: \
+This grabs a screen image, carves it up into a jigsaw puzzle, \
+shuffles it, and then solves the puzzle. This works especially well \
+when you feed it an external video signal instead of letting it grab \
+the screen image (actually, I guess this is generally true...) When \
+it is grabbing a video image, it is sometimes pretty hard to guess \
+what the image is going to look like once the puzzle is solved. \
+Written by Jamie Zawinski.
+
+*hacks.blitspin.name: BlitSpin
+*hacks.blitspin.documentation: \
+The ``blitspin'' hack repeatedly rotates a bitmap by 90 degrees by \
+using logical operations: the bitmap is divided into quadrants, and \
+the quadrants are shifted clockwise. Then the same thing is done \
+again with progressively smaller quadrants, except that all \
+sub-quadrants of a given size are rotated in parallel. Written by \
+Jamie Zawinski based on some cool SmallTalk code seen in in Byte \
+Magazine in 1981. \
+ \n\n\
+As you watch it, the image appears to dissolve into static and then \
+reconstitute itself, but rotated. You can provide the image to use, \
+as an XBM or XPM file, or tell it to grab a screen image and rotate \
+that.
+
+*hacks.slip.documentation: \
+This program throws some random bits on the screen, then sucks them \
+through a jet engine and spews them out the other side. To avoid \
+turning the image completely to mush, every now and then it will and \
+then it interjects some splashes of color into the scene, or go into \
+a spin cycle, or stretch the image like taffy, or (this is my \
+addition) grab an image of your current desktop to chew on. \
+Originally written by Scott Draves; whacked on by Jamie Zawinski.
+
+*hacks.distort.documentation: \
+This hack grabs an image of the screen, and then lets a transparent \
+lens wander around the screen, magnifying whatever is underneath. \
+Written by Jonas Munsin.
+
+*hacks.spotlight.documentation: \
+Draws a spotlight scanning across a black screen, illumnating the \
+underlying desktop when it passes. Written by Rick Schultz.
+
+*hacks.hypercube.documentation: \
+This displays 2D projections of the sequence of 3D objects which are \
+the projections of the 4D analog to the cube: as a square is composed \
+of four lines, each touching two others; and a cube is composed of \
+six squares, each touching four others; a hypercube is composed of \
+eight cubes, each touching six others. To make it easier to \
+visualize the rotation, it uses a different color for the edges of \
+each face. Don't think about it too long, or your brain will melt. \
+Written by Joe Keane, Fritz Mueller, and Jamie Zawinski.
+
+*hacks.halo.documentation: \
+This draws trippy psychedelic circular patterns that hurt to look at. \
+It can also animate the control-points, but that takes a lot of CPU \
+and bandwidth. Written by Jamie Zawinski.
+
+*hacks.maze.documentation: \
+This is the ancient X maze demo, modified to work with xscreensaver. \
+It generates a random maze, then solves it with visual feedback. \
+Originally by Jim Randell; modified by a cast of thousands.
+
+*hacks.noseguy.documentation: \
+A little man with a big nose wanders around your screen saying \
+things. The things which he says can come from a file, or from an \
+external program like `zippy' or `fortune'. This was extracted from \
+`xnlock' by Dan Heller. Colorized by Jamie Zawinski.
+
+*hacks.flame.documentation: \
+Another iterative fractal generator. Written by Scott Draves.
+
+*hacks.lmorph.name: LMorph
+*hacks.lmorph.documentation: \
+This generates random spline-ish line drawings and morphs between \
+them. Written by Sverre H. Huseby and Glenn T. Lines.
+
+*hacks.deco.documentation: \
+This one subdivides and colors rectangles randomly. It looks kind of \
+like Brady-Bunch-era rec-room wall paneling. (Raven says: ``this \
+screensaver is ugly enough to peel paint.'') Written by Jamie \
+Zawinski, inspired by Java code by Michael Bayne.
+
+*hacks.moire.documentation: \
+This one draws cool circular interference patterns. Most of the \
+circles you see aren't explicitly rendered, but show up as a result \
+of interactions between the other pixels that were drawn. Written by \
+Jamie Zawinski, inspired by Java code by Michael Bayne. As he \
+pointed out, the beauty of this one is that the heart of the display \
+algorithm can be expressed with just a pair of loops and a handful of \
+arithmetic, giving it a high ``display hack metric''.
+
+*hacks.moire2.documentation: \
+Another example of the fun you can have with moire \
+interference patterns; this hack generates fields of concentric \
+circles or ovals, and combines the planes with various operations. \
+The planes are moving independently of one another, causing the \
+interference lines to ``spray.'' Written by Jamie Zawinski.
+
+*hacks.lightning.documentation: \
+This one draws crackling fractal lightning bolts. It's simple, \
+direct, and to the point. If only it had sound... Written by Keith \
+Romberg.
+
+*hacks.strange.documentation: \
+This draws strange attractors: it's a colorful, \
+unpredictably-animating field of dots that swoops and twists around. \
+The motion is very nice. Written by Massimino Pascal.
+
+*hacks.spiral.documentation: \
+Moving circular patterns, by Peter Schmitzberger. Moving circular \
+patterns means moire; interference patterns, of course.
+
+*hacks.laser.documentation: \
+Moving radiating lines, that look vaguely like scanning laser beams. \
+Written by Pascal Pensa. (Frankie say: relax.)
+
+*hacks.grav.documentation: \
+This program draws a simple orbital simulation. If you turn on \
+trails, it looks kind of like a cloud-chamber photograph. Written \
+by Greg Bowering.
+
+*hacks.drift.documentation: \
+How could one possibly describe this except as ``drifting recursive \
+fractal cosmic flames?'' Another fine hack from the Scott Draves \
+collection of fine hacks.
+
+*hacks.ifs.name: IFS
+*hacks.ifs.documentation: \
+This one draws spinning, colliding iterated-function-system images. \
+Written by Massimino Pascal.
+
+*hacks.julia.documentation: \
+This one draws spinning, animating (are you detecting a pattern here \
+yet?) explorations of the Julia set. You've probably seen static \
+images of this fractal form before, but it's a lot of fun to watch in \
+motion as well. One interesting thing is that there is a small \
+swinging dot passing in front of the image, which indicates the \
+control point from which the rest of the image was generated. \
+Written by Sean McCullough.
+
+*hacks.penrose.documentation: \
+Draws quasiperiodic tilings; think of the implications on modern \
+formica technology. Written by Timo Korvola. \
+ \n\n\
+In April 1997, Sir Roger Penrose, a British math professor who has \
+worked with Stephen Hawking on such topics as relativity, black \
+holes, and whether time has a beginning, filed a \
+copyright-infringement lawsuit against the Kimberly-Clark \
+Corporation, which Penrose said copied a pattern he created (a \
+pattern demonstrating that ``a nonrepeating pattern could exist in \
+nature'') for its Kleenex quilted toilet paper. Penrose said he \
+doesn't like litigation but, ``When it comes to the population of \
+Great Britain being invited by a multinational to wipe their bottoms \
+on what appears to be the work of a Knight of the Realm, then a last \
+stand must be taken.'' \
+ \n\n\
+As reported by News of the Weird #491, 4-jul-1997.
+
+*hacks.sierpinski.documentation: \
+This draws the two-dimensional variant of the recursive Sierpinski \
+triangle fractal. Written by Desmond Daignault.
+
+*hacks.braid.documentation: \
+Draws random color-cycling inter-braided concentric circles. Written \
+by John Neil.
+
+*hacks.galaxy.documentation: \
+This draws spinning galaxies, which then collide and scatter their \
+stars to the, uh, four winds or something. Originally an Amiga \
+program by Uli Siegmund.
+
+*hacks.bouboule.documentation: \
+This draws what looks like a spinning, deforming baloon with \
+varying-sized spots painted on its invisible surface. Written by \
+Jeremie Petit.
+
+*hacks.swirl.documentation: \
+More flowing, swirly patterns. This version is by M. Dobie and R. \
+Taylor, but you might have seen a Mac program similar to this called \
+FlowFazer. There is also a cool Java applet of a similar concept
+
+*hacks.flag.documentation: \
+This draws a waving colored flag, that undulates its way around the \
+screen. The trick is the flag can contain arbitrary text and images. \
+By default, it displays either the current system name and OS \
+type, or a picture of ``Bob,'' but you can replace the text or the \
+image with a command-line option. Written by Charles Vidal and Jamie \
+Zawinski.
+
+*hacks.sphere.documentation: \
+Another of the classic screenhacks of the distant past, this one \
+draws shaded spheres in multiple colors. This hack traces its \
+lineage back to Tom Duff in 1982.
+
+*hacks.forest.documentation: \
+This draws fractal trees. Written by Peter Baumung. Everybody loves \
+fractals, right?
+
+*hacks.lisa.documentation: \
+This draws Lisajous loops, by Caleb Cullen. Remember that device \
+they had the Phantom Zone prisoners in during their trial in \
+Superman? I think that was one of these.
+
+*hacks.lissie.documentation: \
+Another Lissajous figure. This one draws the progress of circular \
+shapes along a path. Written by Alexander Jolk.
+
+*hacks.goop.documentation: \
+This draws set of animating, transparent, amoeba-like blobs. The \
+blobs change shape as they wander around the screen, and they are \
+translucent, so you can see the lower blobs through the higher ones, \
+and when one passes over another, their colors merge. Written by \
+Jamie Zawinski. I got the idea for this from a cool mouse pad I \
+have, which achieves the same kind of effect in real life by having \
+several layers plastic with colored oil between them. Written by \
+Jamie Zawinski.
+
+*hacks.starfish.documentation: \
+This generates a sequence of undulating, throbbing, star-like \
+patterns which pulsate, rotate, and turn inside out. Another display \
+mode uses these shapes to lay down a field of colors, which are then \
+cycled. The motion is very organic. Written by Jamie Zawinski.
+
+*hacks.munch.documentation: \n\
+ DATAI 2 \n\
+ ADDB 1,2 \n\
+ ROTC 2,-22 \n\
+ XOR 1,2 \n\
+ JRST .-4 \n\
+ \n\
+As reported by HAKMEM, in 1962, Jackson Wright wrote the above PDP-1 \
+code. That code still lives on in this screenhack, some 35 years \
+later. The number of lines of enclosing code has increased \
+substantially, however. This version is by Tim Showalter.
+
+*hacks.fadeplot.name: FadePlot
+*hacks.fadeplot.documentation: \
+Draws what looks like a waving ribbon following a sinusoidal path. \
+Written by Bas van Gaalen and Charles Vidal.
+
+*hacks.coral.documentation: \
+Simulates coral growth, albeit somewhat slowly. This image doesn't \
+really do it justice. Written by Frederick Roeber.
+
+*hacks.mountain.documentation: \
+Generates random 3d plots that look vaguely mountainous. Written by \
+Pascal Pensa.
+
+*hacks.triangle.documentation: \
+Generates random mountain ranges using iterative subdivision of \
+triangles. Written by Tobias Gloth.
+
+*hacks.worm.documentation: \
+An ancient xlock hack that draws multicolored worms that crawl around \
+the screen. Written by Brad Taylor, Dave Lemke, Boris Putanec, and \
+Henrik Theiling.
+
+*hacks.rotor.documentation: \
+Another ancient xlock demo, this one by Tom Lawrence. It draws a \
+line segment moving along a complex spiraling curve. I tweaked this \
+to generate curvier lines, but still frames of it don't look like \
+much.
+
+*hacks.ant.documentation: \
+A cellular automaton that is really a two-dimensional Turing machine: \
+as the heads (``ants'') walk along the screen, they change pixel \
+values in their path. Then, as they pass over changed pixels, their \
+behavior is influenced. Written by David Bagley.
+
+*hacks.demon.documentation: \
+A cellular automaton that starts with a random field, and organizes \
+it into stripes and spirals. Written by David Bagley.
+
+*hacks.loop.documentation: \
+This one produces loop-shaped colonies that spawn, age, and \
+eventually die. Written by David Bagley.
+
+*hacks.vines.documentation: \
+This one generates a continuous sequence of small, curvy geometric \
+patterns. It scatters them around your screen until it fills up, \
+then it clears the screen and starts over. Written by Tracy Camp and \
+David Hansen.
+
+*hacks.kaleidescope.documentation: \
+Another clone of an ancient meme, consisting largely of frenetic \
+rotational motion of colored lines. This one is by Ron Tapia. The \
+motion is nice, but I think it needs more solids, or perhaps just \
+brighter colors. More variations in the rotational speed might help, \
+too.
+
+*hacks.xjack.documentation: \
+This program behaves schizophrenically and makes a lot of typos. \
+Written by Jamie Zawinski. If you haven't seen Stanley Kubrick's \
+masterpiece, ``The Shining,'' you won't get it. Those who have \
+describe this hack as ``inspired.''
+
+*hacks.xlyap.documentation: \
+This generates pretty fractal pictures by doing funky math involving \
+the ``Lyapunov exponent.'' It has a cool interactive mode, too. \
+Written by Ron Record.
+
+*hacks.cynosure.documentation: \
+A hack similar to `greynetic', but less frenetic. The first \
+implementation was by Stephen Linhart; then Ozymandias G. Desiderata \
+wrote a Java applet clone. That clone was discovered by Jamie \
+Zawinski, and ported to C for inclusion here.
+
+*hacks.flow.documentation: \
+Another series of strange attractors: a flowing series of points, \
+making strange rotational shapes. Written by Jeff Butterworth.
+
+*hacks.epicycle.documentation: \
+This program draws the path traced out by a point on the edge of a \
+circle. That circle rotates around a point on the rim of another \
+circle, and so on, several times. These were the basis for the \
+pre-heliocentric model of planetary motion. Written by James \
+Youngman.
+
+*hacks.interference.documentation: \
+Another color-field hack, this one works by computing decaying \
+sinusoidal waves, and allowing them to interfere with each other as \
+their origins move. Written by Hannu Mallat.
+
+*hacks.truchet.documentation: \
+This draws line- and arc-based Truchet patterns that tile the screen. \
+Written by Adrian Likins.
+
+*hacks.bsod.name: BSOD
+*hacks.bsod.documentation: \
+BSOD stands for ``Blue Screen of Death.'' The finest in personal \
+computer emulation, this hack simulates popular screen savers from a \
+number of less robust operating systems. Written by Jamie Zawinski.
+
+*hacks.crystal.documentation: \
+Moving polygons, similar to a kaleidescope (more like a kaleidescope \
+than the hack called `kaleid,' actually.) This one by Jouk Jansen.
+
+*hacks.discrete.documentation: \
+More ``discrete map'' systems, including new variants of Hopalong and \
+Julia, and a few others. Written by Tim Auckland.
+
+*hacks.kumppa.documentation: \
+Spiraling, spinning, and very, very fast splashes of color rush \
+toward the screen. Written by Teemu Suutari.
+
+*hacks.rd-bomb.name: RD-Bomb
+*hacks.rd-bomb.documentation: \
+Another variation of the `Bomb' program by Scott Draves. This draws \
+a grid of growing square-like shapes that, once they overtake each \
+other, react in unpredictable ways. ``RD'' stands for \
+reaction-diffusion.
+
+*hacks.sonar.documentation: \
+This program draws a simulation of a sonar screen. Written by \
+default, it displays a random assortment of ``bogies'' on the screen, \
+but if compiled properly, it can ping (pun intended) your local \
+network, and actually plot the proximity of the other hosts on your \
+network to you. It would be easy to make it monitor other sources of \
+data, too. (Processes? Active network connections? CPU usage per \
+user?) Written by Stephen Martin.
+
+*hacks.t3d.name: T3D
+*hacks.t3d.documentation: \
+This draws a working analog clock composed of floating, throbbing \
+bubbles. Written by Bernd Paysan.
+
+*hacks.penetrate.documentation: \
+This hack simulates the classic arcade game Missile Command. Written \
+by Adam Miller.
+
+*hacks.deluxe.documentation: \
+This draws a pulsing sequence of stars, circles, and lines. It would \
+look better if it was faster, but as far as I can tell, there is no \
+way to make this be both: fast, and flicker-free. Yet another reason \
+X sucks. Written by Jamie Zawinski.
+
+*hacks.compass.documentation: \
+This draws a compass, with all elements spinning about randomly, for \
+that ``lost and nauseous'' feeling. Written by Jamie Zawinski.
+
+*hacks.squiral.documentation: \
+Draws a set of interacting, square-spiral-producing automata. The \
+spirals grow outward until they hit something, then they go around \
+it. Written by Jeff Epler.
+
+*hacks.xflame.documentation: \
+Draws a simulation of pulsing fire. It can also take an arbitrary \
+image and set it on fire too. Written by Carsten Haitzler, hacked on \
+by many others.
+
+*hacks.wander.documentation: \
+Draws a colorful random-walk, in various forms. Written by Rick \
+Campbell.
+
+*hacks.critical.documentation: \
+Draws a system of self-organizing lines. It starts out as random \
+squiggles, but after a few iterations, order begins to appear. \
+Written by Martin Pool.
+
+*hacks.phosphor.documentation: \
+Draws a simulation of an old terminal, with large pixels and \
+long-sustain phosphor. It can run any program as a source of the text \
+it displays. Written by Jamie Zawinski.
+
+*hacks.xmatrix.documentation: \
+A rendition of the text scrolls seen in the movie ``The Matrix.'' \
+Written by Jamie Zawinski.
+
+*hacks.petri.documentation: \
+This simulates colonies of mold growing in a petri dish. Growing \
+colored circles overlap and leave spiral interference in their wake. \
+Written by Dan Bornstein.
+
+*hacks.shadebobs.name: ShadeBobs
+*hacks.shadebobs.documentation: \
+This draws smoothly-shaded oscilating oval patterns, that look \
+something like vapor trails or neon tubes. Written by Shane Smit.
+
+*hacks.ccurve.name: C Curve
+*hacks.ccurve.documentation: \
+Generates self-similar linear fractals, including the classic ``C \
+Curve.'' Written by Rick Campbell.
+
+*hacks.blaster.documentation: \
+Draws a simulation of flying space-combat robots (cleverly disguised \
+as colored circles) doing battle in front of a moving star field. \
+Written by Jonathan Lin.
+
+*hacks.bumps.documentation: \
+A bit like `Spotlight', except that instead of merely exposing part \
+of your desktop, it creates a bump map from it. Basically, it \
+3D-izes a roaming section of your desktop, based on color intensity. \
+Written by Shane Smit.
+
+*hacks.webcollage.name: WebCollage
+*hacks.webcollage.documentation: \
+This program makes collages out of random images pulled off of the \
+World Wide Web. It finds these images by doing random web searches, \
+and then extracting images from the returned pages. It can also be \
+set up to filter the images through the `VidWhacker' program, above, \
+which looks really great. \
+ \n\n\
+(Note that most of the images it finds are text, and not pictures. \
+This is because most of the web is pictures of text. Which is pretty \
+sad.) Written by Jamie Zawinski.
+
+*hacks.vidwhacker.name: VidWhacker
+*hacks.vidwhacker.documentation: \
+This is actually just a shell script that grabs a frame of video from \
+the system's video input, and then uses some PBM filters (chosen at \
+random) to manipulate and recombine the video frame in various ways \
+(edge detection, subtracting the image from a rotated version of \
+itself, etc.) Then it displays that image for a few seconds, and \
+does it again. This works really well if you just feed broadcast \
+television into it. \
+ \n\n\
+Currently, the three lines of the script that actually grab the \
+source picture are SGI specific, but it should be trivial to adapt it \
+to work on other systems that can grab video (please send me the \
+changes if you do this...)
+
+*hacks.rocks.documentation: \
+This draws an animation of flight through an asteroid field, with \
+changes in rotation and direction. It can also display 3D \
+separations for red/blue glasses! Mostly written by Jamie Zawinski.
+
+*hacks.bubbles.documentation: \
+This simulates the kind of bubble formation that happens when water \
+boils:small bubbles appear, and as they get closer to each other, \
+they combine to form larger bubbles, which eventually pop. Written \
+by James Macnicol.
+
+*hacks.gears.documentation: \
+This draws a set of turning, interlocking gears, rotating in three \
+dimensions. Another GL hack, by Danny Sung, Brian Paul, and Ed \
+Mackey.
+
+*hacks.superquadrics.documentation: \
+Ed Mackey reports that he wrote the first version of this program in \
+BASIC on a Commodore 64 in 1987, as a 320x200 black and white \
+wireframe. Now it is GL and has specular reflections.
+
+*hacks.morph3d.name: Morph3D
+*hacks.morph3d.documentation: \
+Another 3d shape-changing GL hack, by Marcelo Vianna. It has the \
+same shiny-plastic feel as Superquadrics, as many computer-generated \
+objects do...
+
+*hacks.cage.documentation: \
+This draws Escher's ``Impossible Cage,'' a 3d analog of a moebius \
+strip, and rotates it in three dimensions. Written by Marcelo \
+Vianna.
+
+*hacks.moebius.documentation: \
+Another M. C. Escher hack by Marcelo Vianna, this one draws \
+``Moebius Strip II,'' a GL image of ants walking along the surface of \
+a moebius strip.
+
+*hacks.stairs.documentation: \
+by Marcelo Vianna's third Escher GL hack, this one draws an \
+``infinite'' staircase.
+
+*hacks.pipes.documentation: \
+If you've ever been in the same room with a Windows NT machine, \
+you've probably seen this GL hack. This version is by Marcelo \
+Vianna.
+
+*hacks.sproingies.documentation: \
+Q-Bert meets Marble Madness! Written by Ed Mackey.
+
+*hacks.rubik.documentation: \
+Draws a Rubik's Cube that rotates in three dimensions and repeatedly \
+shuffles and solves itself. Another fine GL hack by Marcelo Vianna.
+
+*hacks.atlantis.documentation: \
+This is xfishtank writ large: a GL animation of a number of sharks, \
+dolphins, and whales. The swimming motions are great. Originally \
+written by Mark Kilgard.
+
+*hacks.lament.documentation: \
+Animates a simulation of Lemarchand's Box, repeatedly solving itself. \
+Requires OpenGL, and a machine with fast hardware support for texture \
+maps. Warning: occasionally opens doors. Written by Jamie Zawinski.
+
+*hacks.bubble3d.name: Bubble3D
+*hacks.bubble3d.documentation: \
+Draws a stream of rising, undulating 3D bubbles, rising toward the \
+top of the screen, with nice specular reflections. Written by Richard \
+Jones.
+
+*hacks.glplanet.name: GLPlanet
+*hacks.glplanet.documentation: \
+Draws a planet bouncing around in space. Written by David Konerding. \
+The built-in image is a map of the earth (extracted from `xearth'), \
+but you can wrap any texture around the sphere, e.g., the planetary \
+textures that come with `ssystem'.
+
+*hacks.pulsar.documentation: \
+Draws some intersecting planes, making use of alpha blending, fog, \
+textures, and mipmaps, plus a ``frames per second'' meter so that you \
+can tell how fast your graphics card is... Requires OpenGL. Written \
+by David Konerding.
+
+*hacks.extrusion.documentation: \
+Draws various rotating extruded shapes that twist around, lengthen, \
+and turn inside out. Created by David Konerding from the samples \
+that come with the GL Extrusion library by Linas Vepstas.
+
+*hacks.sierpinski3d.name: Sierpinski3D
+*hacks.sierpinski3d.documentation: \
+This draws the three-dimensional variant of the recursive Sierpinski \
+triangle fractal, using GL. Written by Tim Robinson.
+
+*hacks.ripples.documentation: \
+This draws rippling interference patterns like splashing water. \
+With the -water option, it manipulates your desktop image to look \
+like something is dripping into it. Written by Tom Hammersley.
+
+
+!=============================================================================
+!
+! Documentation for some programs that are not bundled with XScreenSaver
+!
+!=============================================================================
+
+*hacks.xdaliclock.name: XDaliClock
+*hacks.xdaliclock.documentation: \
+XDaliClock draws a large digital clock, the numbers of which change by \
+``melting'' into their new shapes. Written by Jamie Zawinski.
+
+*hacks.xearth.documentation: \
+XEarth draws an image of the Earth, as seen from your favorite vantage \
+point in space, correctly shaded for the current position of the Sun. \
+Written by Kirk Johnson.
+
+*hacks.ssystem.name: SSystem
+*hacks.ssystem.documentation: \
+SSystem is a GL Solar System simulator. It simulates flybys of Sun, \
+the nine planets and a few major satellites, with four camera modes. \
+Written by Raul Alonso.
+
+*hacks.xmountains.documentation: \
+XMountains generates realistic-looking fractal terrains of snow-capped \
+mountains near water, with either a top view or a side view. \
+Written by Stephen Booth.
projects / xscreensaver / blobdiff