[graphviz-interest] Question: How to improve cluttered graph layout

Hello everybody,

I have a problem with the layout of one of my graphs. (Dot-file attached)

1) the "rankdir" in the cluster seems to be ignored.
The "High"-node (the triangle) is supposed to go left of the 
"BootRAM"-node, but whatever I try it doesn't (which makes routing far 
more complicated).

2) The edge routing is quite ugly in this case. I want the edges to 
leave and reach the nodes at certain ports from certain directions, 
therefor I specified them, but sometimes the specification seems to be 
ignored.
I tried routing the splines via "splines = ortho" but it seems to make 
only one turn at best one turn. (Or ignores the directions at which the 
ports are supposed to be left or arrived at.) In general I aim for an 
edge routing that looks more straight, with sharp turns. I tried using 
"invisible" intermediate nodes to make the routing easier for the tool, 
but it didn't work out well, so I dropped them…

Hopefully you can help me to unknot my ravel.
Thank you in advance.

-- Fredo

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