Demonstration of Interactive X Graphics from Lisp

This is a demo of the X Interface for Gnu Common Lisp which is available as free software under the Gnu General Public License from

When the demo is started, a window is created and some things are drawn in it. A menu of options is presented; select an option and then click the mouse one or more times inside the graphics window.

The code is fairly simple.


  1. You must be logged in to a host running X windows.
  2. Type xhost + (exactly as shown at left) in a window on that host to allow this server to write to your display.
  3. Enter your X display name here if needed; you may need to change what is shown in the box to your X display name. For example,
  4. Click to start the demo.
Gordon S. Novak Jr.