[igraph] Adding vertex attributes to sugiyama layout

[Jack O'Neill]

Dear All,

I'd like to ask is there a way to add a vertex shape/size attribute?

My code:

igraph_t g;
igraph_matrix_t coords;
igraph_vector_t edgelist;

igraph_matrix_init(&coords, 0, 0);
igraph_vector_init(&edgelist, getEdgeCount() * 2);

int plusNodes = 0; // number of nodes that have no edges
std::map<Node*, int> indexMap;
for (int i = 0; i < getNodeCount(); ++i) {
indexMap.insert(std::make_pair(getNodes().at(i).get(), i));
if (getNodes().at(i)->getInEdges().size() <= 0 &&
getNodes().at(i)->getOutEdges().size() <= 0) {
++plusNodes;
}
}

int ec = 0;
for (const auto &e : getEdges()) {
VECTOR(edgelist)[ec++] = indexMap[e->getSource()];
VECTOR(edgelist)[ec++] = indexMap[e->getDestination()];
}

igraph_create(&g, &edgelist, getNodeCount(), IGRAPH_DIRECTED);
igraph_add_vertices(&g, plusNodes, nullptr);
igraph_layout_sugiyama(&g, &coords, nullptr, nullptr, nullptr,
/* hgap = */ 1,
/* vgap = */ 1,
/* maxiter = */ 100,
/* weights = */ nullptr);

for (int i = 0; i < getNodeCount(); ++i) {
getNodes().at(i)->getItem()->setX(igraph_matrix_e(&coords, i, 0));
getNodes().at(i)->getItem()->setY(igraph_matrix_e(&coords, i, 1));
}

igraph_vector_destroy(&edgelist);
igraph_matrix_destroy(&coords);
igraph_destroy(&g);

This gives result within [0, 5] range. Overlap removal is a must for me so
i need to supply the vertex (rectengular shape) widths and heights to get
correct results.
Is there a way to do this?
I'd also like to supply the port positions for edges if possible. I'm not
sure what attributes igraph uses, and what are just decorations.

Thanks