How does one draw Lewis structures on the computer?

[Banaticus]

Homework Statement

Is there some sort of Latex that allows one to draw Lewis structures on the computer?

The Attempt at a Solution

The following code works in Textify: http://www.texify.com/links.php but not here, apparently. Anyway, I can make 1D Lewis structures (every element in a line). I have no idea how I'd go about making 2D structures.

\text{Mg:O\limits_{.\,.}^{.\,.}:}

\text{[:{Cl}\limits_{.\,.}^{.\,.}]^+[:O\limits_{.\,.}^{.\,.}:]^{2-}[:{Cl}\limits_{.\,.}^{.\,.}:]^+} \\

\text{[:O\limits_{.\,.}^{.\,.}-N\limits_{}^{.}=O\limits_{}^{.\,.}:]^+} \\

\text{[:S\limits_{}^{.\,.}-C=N\limits_{}^{.\,.}:]^-}

How would one go about drawing, say BF₄?

 

[Banaticus]

So, when the rest of you are making Lewis structures for homework, a lab report or a lab writeup, how do the rest of you format them? Should I break out Windows Paint?