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graph vertex labels placement or alignment

asked 2014-03-31 09:40:01 +0200

alejandroerickson gravatar image

updated 2015-01-13 21:55:15 +0200

FrédéricC gravatar image

I made a sage Graph() for visualizing a bibliography and found that there was no good way to align or change the placement of the vertex labels.

I wanted some labels to align left and others to align right, but they were all centred on their vertex. I ended up doubling the length of the label string with spaces and adding a period with some code like the following

    lDict = {}
for v in G.vertices():
    if <test for the type of vertex>:
        lDict[v] = v + len(v)*' ' + '.'
        lDict[v] = ''.join(['.',len(v)*' ',v])

I managed to get this (click for full sized image):


Is there a way to manipulate the placement of the labels?

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answered 2014-03-31 10:24:44 +0200

Nathann gravatar image

No way that I know. But Sage is an open-source project, so if you have a good idea for that, you are welcome to contribute !


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answered 2014-03-31 12:03:34 +0200

kcrisman gravatar image

I believe you'll want to use the optional tikz interface, lovely described (complete with vertex label positioning) at this location.

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The example is pretty. I think I might use the tikz graphs every time!

alejandroerickson gravatar imagealejandroerickson ( 2014-03-31 12:34:51 +0200 )edit

Great! I have to admit tikz is pretty awesome - the learning curve is worth it. If this solved your problem, please accept the answer so other people searching this question will see it was solved.

kcrisman gravatar imagekcrisman ( 2014-04-01 10:23:37 +0200 )edit

As of now it doesn't work on my installation, but I'll select it when it works for me. Thanks!

alejandroerickson gravatar imagealejandroerickson ( 2014-04-01 11:18:32 +0200 )edit

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Asked: 2014-03-31 09:40:01 +0200

Seen: 814 times

Last updated: Mar 31 '14