Tree Drawing?

[zhiyuan luo]

Does anyone have a free algorithm or programme written in C for drawing
tree, which runs on Sun? If you have, could you e-mail or post it to me. 

Thanks in advance.

-- 
--Zhiyuan Luo   	     		JANET : zhiyuan at uk.ac.hw.cs
  Dept. of Computer Science
  Heriot-Watt University		ARPA  : zhiyuan at cs.hw.ac.uk
  79 Grassmarket
  EDINBURGH EH1 2HJ                     UUCP  : ...!ukc!cs.hw.ac.uk!zhiyuan
  U.K.