[Lemon-user] How to construct a planar drawing?

[Szabolcs Horvát]

Hello everyone,

I am new to Lemon, and I am trying to construct a PlanarDrawing of a graph.

It's not working, and I'm not quite sure what I am doing wrong. The
analogous way of using PlanarEmbedding worked fine.

Here's a minimal example (to be compiled as C++11):

#include <lemon/static_graph.h>

#include <lemon/planarity.h>


#include <utility>

#include <vector>

#include <iostream>


using namespace lemon;

using namespace std;


int main() {

    StaticDigraph digraph;


    vector<pair<int,int>> edges = {{0, 1}, {0, 2}, {1, 2}}; // already sorted

    digraph.build(3, edges.begin(), edges.end());


    typedef Undirector<StaticDigraph> Graph;

    Graph graph (digraph);


    PlanarDrawing<Graph> drawing(graph);

    drawing.run();


    return 0;

}


The error I get is:

type 'const lemon::PlanarEmbedding<lemon::Undirector<lemon::StaticDigraph>
>' does not provide a subscript operator

          Arc ee = embedding[_graph.direct(e, true)];

I'm not quite sure what to make of it.

Can anyone point out my mistake?

Best regards,
Szabolcs
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