draw edge from node to edge in graphviz

Question

Is it possible to draw an edge from a Node to the center of an existing Edge in graphviz? I would like to duplicate this type of reaction diagram, common in chemical or biological networks.

Thanks!

--Peter

Answer 1

Yes, you can use invisible nodes, like in this example for instance.

Then play with creating subgraphs for A and B where

rank=same

and then an edge where

constraint=false

for the connection from C to the invisible node. This will put the first two above C.