Re: [igraph] Position edge labels in python

[José Juan Almagro Armenteros]

Hi again,

Thank you for the detailed description. I have found the part of the code that I need to change. It is the variable pi4 in get_label_position() what I needed to make smaller.

Best,
Jose

On 21/12/2016 10:22, Tamas Nepusz wrote:

Hi,

Edge drawing is implemented in specialized edge drawer classes in igraph/drawing/edge.py. They all derive from an abstract base class called AbstractEdgeDrawer, which defines a function named get_label_position() that returns the position of the label for an edge. The default edge drawer used by igraph is called ArrowEdgeDrawer.

You can therefore simply implement a new class derived from ArrowEdgeDrawer, override its get_label_position() method, and then use this custom edge drawer when plotting the graph as follows:

from igraph.drawing.edge import ArrowEdgeDrawer

from igraph.drawing.graph import DefaultGraphDrawer

from functools import partial

class CustomEdgeDrawer(ArrowEdgeDrawer):

    # do your magic here

    pass

my_drawer = partial(DefaultGraphDrawer, edge_drawer_factory=CustomEdgeDrawer)

plot(graph, drawer_factory=my_drawer)

(Haven't tested it, but it should work).

All the best,

T.

On Wed, Dec 21, 2016 at 10:03 AM, José Juan Almagro Armenteros <address@hidden> wrote:

Hello,

Thank you for the info. Could you indicate which function defines the position of the edge labels? At least I would like to change the default positions for all the labels.

Best,
Jose

On 20/12/2016 21:10, Tamas Nepusz wrote:

Hi,

Unfortunately it is not possible to change the position of edge labels with the current plotting engine.

All the best,

T.

On Tue, Dec 20, 2016 at 6:23 PM, José Juan Almagro Armenteros <address@hidden> wrote:

Hello,

I have just started using this packages and I have generated a nice tree plot. However, I haven't been able to change the position of the edge labels and there is no documentation about it. Do you know how could I do this?

Best,
Jose


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