hopalong - draw real plane fractals


hopalong [-display host:display.screen] [-foreground color] [-background color] [-window] [-root] [-mono] [-install] [-visual visual] [-ncolors integer] [-delay microseconds] [-cycles integer] [-count integer] [-jong] [-no-jong] [-jong] [-no-sine]



The hop program generates real plane fractals as described in the September 1986 issue of Scientific American.


hopalong accepts the following options:
-window Draw on a newly-created window. This is the default.
-root Draw on the root window.
-mono If on a color display, pretend we’re on a monochrome display.
-install Install a private colormap for the window.
-visual visual
 Specify which visual to use. Legal values are the name of a visual class, or the id number (decimal or hex) of a specific visual.
-ncolors integer
 How many colors should be used (if possible). Default 200. The colors used cycle through the hue, making N stops around the color wheel.
-cycles integer
 How long to run each batch. Default 2500 pixels.
-count integer
 How many pixels should be drawn before a color change. Default 1000.
-jong integer
-no-jong integer
 Whether to use the Jong format (default is to choose randomly.)

-sine integer
-no-sine integer
 Whether to use the Sine format (default is to choose randomly.)

-fps Display the current frame rate and CPU load.


DISPLAY to get the default host and display number.
 to get the name of a resource file that overrides the global resources stored in the RESOURCE_MANAGER property.


X(1), xscreensaver(1), xlock(1)


Copyright © 1988-91 by Patrick J. Naughton.

Permission to use, copy, modify, and distribute this software and its documentation for any purpose and without fee is hereby granted, provided that the above copyright notice appear in all copies and that both that copyright notice and this permission notice appear in supporting documentation.


Patrick J. Naughton <>, 23-mar-88.

Ability to run standalone or with xscreensaver added by Jamie Zawinski <>, 13-aug-92, and again on 10-May-97.

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