Fixed node positions in cgraph

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 try gvLayout(context, graph, "nop") in my code, 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.

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