I have filed a bug with a patch.
https://lemon.cs.elte.hu/trac/lemon/ticket/611
On Tue, May 15, 2018 at 4:16 PM Szabolcs Horvát <szhor...@gmail.com> wrote:
> I think I found another problem. Running the drawing algorithm on a graph
> with no edges and less than 3 vertices causes a crash. Of course, it is
> easy to work around this. But it would be nice to have it fixed.
>
> Minimal example with the singleton graph:
>
>
> #include <lemon/static_graph.h>
>
> #include <lemon/planarity.h>
>
>
> #include <utility>
>
> #include <vector>
>
>
> using namespace lemon;
>
> using namespace std;
>
>
> int main() {
>
>
> StaticDigraph digraph;
>
>
> vector<pair<int,int>> edges = {}; // already sorted
>
> digraph.build(1, edges.begin(), edges.end());
>
>
> typedef Undirector<StaticDigraph> Graph;
>
> Graph graph(digraph);
>
>
> PlanarEmbedding<Graph> embedding(graph);
>
> embedding.run(false);
>
>
> PlanarDrawing<Graph> drawing(graph);
>
> drawing.run(embedding.embeddingMap());
>
>
> return 0;
>
> }
>
>
>
>
> On Tue, 15 May 2018 at 14:40, Szabolcs Horvát <szhor...@gmail.com> wrote:
>
>> Thanks for the clarification Balázs!
>>
>> On Tue, 15 May 2018 at 14:21, Balázs Dezső <deba...@gmail.com> wrote:
>>
>>> I have also filed a bug and created a patch:
>>> http://lemon.cs.elte.hu/trac/lemon/ticket/610
>>>
>>> On Tue, May 15, 2018 at 2:02 PM Balázs Dezső <deba...@gmail.com> wrote:
>>>
>>>> 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 <szhor...@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
>>>>> _______________________________________________
>>>>> Lemon-user mailing list
>>>>> Lemon-user@lemon.cs.elte.hu
>>>>> http://lemon.cs.elte.hu/mailman/listinfo/lemon-user
>>>>>
>>>> _______________________________________________
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