[graphviz-interest] Fixed Node Positions in cgraph

Hello,

I'm using Graphviz and cgraph to layout some graphs and, for some
cases, I already know the positions I want my nodes to be at (as they
form a subgraph of a bigger graph).

Using the `dot` command line tool, you can add the `-Knop` layout
option, but if I try `gvLayout(context, graph, "nop"), or call
`gvParseArgs` for `dot -Knop` arguments, the resulting graph has no
edge routing, even though I have `agset(graph, (char*)"splines",
(char*)"true")` in my code.

Is there any way I can achieve such edge routing for fixed node
positions in cgraph?

Thanks,
Ștefan
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