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[igraph] vertex label position depends on the font size

From: Andrei Sokolov
Subject: [igraph] vertex label position depends on the font size
Date: Sun, 29 Aug 2010 07:23:33 +0000


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')

Attachment: test_labels.avi
Description: MS Video

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