Why does graph plotting crop so aggressively, and what is a work-around?

asked 2011-03-21 14:00:06 +0100

Sammy Black
101 ●3 ●5 ●11

updated 2023-01-10 00:01:07 +0100

tmonteil
27423 ●31 ●204 ●517 http://wiki.sagemath.o...

Surely, the Sage community is aware of this bug. For example, there is this ticket, in which the problem is supposed to be fixed. But it's not!

A patch is described: in sage/graphs/graph_plot.py we can add the line(?)

G._extra_kwds['axes_pad']=.05

Am I to change this value in order to fix this over-zealous cropping behavior? No matter what I do, in this regard, I still end up with graph vertices partially cut off.

What's the easy work-around? I would like to be able to plot graphics_array objects with several graphs (with their vertices clearly shown!).

(http://trac.sagemath.org/sage_trac/ti...)

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Comments

I'm keenly interested in this too, and have been for a while (although I haven't gotten around to trying to figure it out).

niles ( 2011-03-21 14:11:38 +0100 )edit

Can you post code that replicates the problem and the Sage version you are using. In 4.6.2 I do: sage: g = Graph({0:{1:'a'}, 1:{2:'b'}, 2:{0:'c'}}); g.plot() --- and I get a nice triangle, no cropping occurs. I tried a bunch of other graphs from the database and they all seem fine too.

benjaminfjones ( 2011-03-21 15:08:52 +0100 )edit

Ah.. it's probably because the `axes_pad` doesn't get passed to the graphics array.

benjaminfjones ( 2011-03-21 15:16:37 +0100 )edit

@benjaminfjones: I am using 4.5.3. Perhaps it's time for an upgrade. :)

Sammy Black ( 2011-03-21 16:57:42 +0100 )edit

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answered 2011-03-21 15:18:39 +0100

benjaminfjones
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Try this:

sage: g1 = Graph({0:{1:'a'}, 1:{2:'b'}, 2:{0:'c'}})
sage: g2 = Graph({0:{1:'a'}, 1:{2:'b'}, 2:{3:'c'}, 3:{0:'d'}})
sage: G = graphics_array([g1.plot(), g2.plot()])
sage: G.show(axes_pad=0.1)

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Thanks. I wasn't using the keyword `axes_pad` explicitly, but rather trying to hack the `graph_plot.py` module. This works.

Sammy Black ( 2011-03-21 16:59:31 +0100 )edit

I wish somebody would fix this at Sage Days 29 right now!

William Stein ( 2011-03-22 01:42:48 +0100 )edit

Michael D. would be a natural person to take a look at this, if he wants to dive into the Sage plotting code. He might glance at #9211 and see what he thinks about it.