Multiple edges between nodes? about pyvis

[aristaeus]

Ack, I forgot to mention that you also need to use a directed graph. Below works for me

from pyvis.network import Network

g = Network(directed=True)
g.add_node(0)
g.add_node(1)
g.add_edge(0, 1)
g.add_edge(0, 1)

g.set_edge_smooth('dynamic')
g.show('foo.html')

For an undirected graph, make the arrows really small.

[akarneliuk]

I'm afraid that doesn't work. I created a simple code:

    G = Network(width="800px", height='600px', heading='Test connectivity', layout=True, bgcolor='#aaaaaa')

    G.add_node(1, label='1', title='node 1', group=1, level=1)
    G.add_node(2, label='2', title='node 2', group=2, level=2)

    G.add_edge(1,2, label='link A', title='link A')
    G.add_edge(1,2, label='link B', title='link B')
    
    G.set_edge_smooth('dynamic')
    G.show('output/tt.html')

Once Iook into generated image, there is only a single edge

[aristaeus]

Without nt.set_edge_smooth('dynamic') they're all drawn on top of each other. See the below example.

from pyvis.network import Network
import networkx as nx

g = nx.MultiGraph()
g.add_node(0)
g.add_node(1)
g.add_edge(0, 1)
g.add_edge(0, 1)

nt = Network(directed=True)
nt.from_nx(g)
nt.set_edge_smooth('dynamic')
nt.show('foo.html')

[laimaretto]

So, yes, it seems that this works, but all the links are shown together. For me it works without the nt.set_edge_smooth('dynamic')...

I'm importing into Network from networkx...

nt = Network("500px", "1000px", directed=True)
nt.from_nx(G)
nt.show('g.html')

In [209]: len(nt.edges)                                                                                                              
Out[209]: 862

Is there any chance of showing the different links apart from each other, so that they are not superimposed?

[laimaretto]

Yes, indeed, you were right ...

I have a different problem now: the nodes keep moving around the webpage, preety much like happy electrons ... :-) ... I believe is because of the several links that I try to show ... I believe I should tweak some of the physics...

thanks anyway!

[akarneliuk]

Yeah, here're is the thing. You can disable the the physics as nt.toggle_physics(False), but that will put the links back to be drawn in the same way: one over another one.

[BerserkerGaruk]

This looks to be answered. Closing issue.
Also to @xhdix 's comment going to expand on that a bit. Below is the documentation for each network. MultiGraph will work with a directed network as it is still a network, but it does not support directions.
MultiDiGraph
MultiGraph

Might be a consideration to add a warning when that option is specified with the incorrect graph type to make it more user friendly.

[aristaeus]

You need to enable smooth edges with the "dynamic" algorithm. https://pyvis.readthedocs.io/en/latest/documentation.html#pyvis.network.Network.set_edge_smooth

[xhdix]

For people like me who came to this page from a search: Use MultiDiGraph instead of MultiGraph.
Xref: #119