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

[Balázs Dezső]

This looks to be a bug in lemon. If you need a quick workaround, then pass
an embedding to the run() function, like here:
http://lemon.cs.elte.hu/trac/lemon/browser/lemon/test/planarity_test.cc#L249

On Tue, May 15, 2018 at 1:38 PM Szabolcs Horvát <szhorvat at gmail.com> wrote:

> 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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>
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