Poly-pen is a graphical proxy for Common Lisp. It links hi-level operations to low-level back-ends libraries. It offers a simple interface to image generation and a few hi-level operations like plots and color maps. You can find example images with the generation code in the user manual. Fract uses Poly-pen for its image rendering.
Documentation is a bit lacking at this time, you can find a basic tutorial in the user manual but you will have to play in the REPL and dig in the code if you want to use all the features. For your convenience the user manual is also available in .PS and .PDF.
Copyright © 2001-2005 Yannick Gingras <email@example.com>
You can use my public key to send me secure transmissions.