led matrix(max7219) + processing, how?

Hi,

I yet connected arduino to processing, and it appear work correctly(only lock error but it work).

Now i want to understand how can i manipulate my matrix in real time with processing, i want to try to create a quad and move it on the matrix, but i don't know how can i transform quad in the serial signal for my max7219.

anyone can help me?

Also i'd like to resolve the /var/lock error, i' yet added my user to uucp group but even though it work, return me the /var/lock error.

Q