LaTeX: Drawing Coxeter/Dynkin graph

[CompuChip]

Hi.

Do you know of any package to draw Coxeter graphs and Dynkin diagrams in LaTeX directly?

Currently I'm taking Lie-algebra's and working out my assignment in (PDF)-LaTeX. I need to draw a simple Coxeter graph / Dynkin diagram, like the following:
O==o--o--o--o--o==O
where o indicates an open dot, O a closed dot, --- stands for a single line and === for a double line. I don't really care about the dots, it's also fine if I can put an arrow through the line
o==<==o--o--o--o--o==>==o
as long as I can indicate the shorter and longer roots.

Alternatively, it'd be nice to label the vertices, but that's not a requisite for me. Of course, I can draw such a diagram in Paint (eeek) or a vector program like Inkscape (overkill?) but I was wondering if there doesn't just exist some LaTeX package that will do this for me. Not too complicated please, probably I can use MetaPost, but a) I'd have to learn it and b) I'd have to switch from pdfLaTeX to latex,dvi->ps->pdf which is way too complicated.

Any ideas?

PS Didn't know what would be the best forum, I just guessed this one because I think here I have the largest chance of someone active in this subject who uses this regularly coming by.

 

[morphism]

PS Didn't know what would be the best forum, I just guessed this one because I think here I have the largest chance of someone active in this subject who uses this regularly coming by.

Maybe sci.math is a better bet.

 

[robphy]

You could do it with the picture environment.. but you'd have to lay out the elements manually. Here's my example on PF https://www.physicsforums.com/showpost.php?p=261562&postcount=297

If you want something graphical... you could try exporting LaTeX from xfig or from http://jpicedt.sourceforge.net/ .

For packages, a little googline turned up:
http://www.cs.umu.se/~drewes/graphs/