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Dear localghost,

Thank you very much for the reply.
Your solution works indeed!
However, I came across yet another problem.
The solution does not work for self-loops.

Do you have any idea? :)

I have attached the code below.
You can un-comment the hard coded values in order to see what result is ...

Dear Thorsten,

Thank you for your reply.
I will take care of your suggestion when I post the code next time.

Thanks for your solution.
I tried it out, however, the black circle is below the edge from C to A.
I want it exactly to be on the edge.

Hence I used the following solution.
I was wondering ...

Dear Forum,

I am trying to make a data flow graph using tikZ package and related libraries.

\usetikzlibrary{arrows,automata,calc}
...
\begin{tikzpicture}[->,>=stealth',shorten >=1pt,auto,node distance=2.0cm,thick]
\tikzstyle{every state}=[fill=white,draw=black,text=black]

\node[state] (A) {$A ...