[igraph] vertex label position depends on the font size

[Andrei Sokolov]

Hi,

I have a problem with the vertex labels.

It appears that the label position for vertex 0 depends on the font size.

It shifts from bottom left to top right as I increase the font size.

You can see it for yourself if you run the code below.

It makes a movie of a simple network with labels of gradually increasing size.

I attached the movie for your convenience.

Does anyone know what may be causing this and how to fix the position of vertex 0 so that it stays fixed?

    from igraph import *

    graph = Graph(5)

    

    visual_style = {}    

    visual_style["vertex_label_color"] = ['yellow','yellow','yellow','yellow','yellow']

    visual_style["layout"] = graph.layout('circle')

    visual_style["vertex_size"] = [15,15,15,15,15]

    visual_style["vertex_color"] = ['black','black','black','black','black']

    visual_style["vertex_label_dist"] = [0,0,0,0,0]

    visual_style["margin"] = 100

    

    for i in range(1,21):

      visual_style["vertex_label_size"] = [i,i,i,i,i]

      plot(graph, "test_labels" + "%02d"%i + ".png", **visual_style)

      

    import os

    os.system('mencoder "mf://test_labels*.png" -mf type=png:fps=2 -ovc lavc -o test_labels.avi')

test_labels.avi
Description: MS Video