Thread: [Matplotlib-users] strange behaviour with sankey diagram (maybe a bug)

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[Matplotlib-users] strange behaviour with sankey diagram (maybe a bug)

From: Giovanni <gio...@in...> - 2012-05-21 16:06:47

Attachments: sankey_patchlabel.py sankey_test.png

  Hi all! I'm experiencing a strange behaviour with sankey diagram. As
you can see from the attached image, the patch label it's not
positioned in the middle of the patch (as it should), but it's plotted
over the first label... The code is attached also.
Any hints?

Thanks,
  Giovanni

Re: [Matplotlib-users] strange behaviour with sankey diagram (maybe a bug)

From: Kevin D. <kda...@gm...> - 2012-05-22 01:30:22

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    <pre wrap="">Hi Giovanni,

Thanks for your report.  It looks like in this case the "dip" in the large, single input caused the input label to be at the center of the diagram.  You might want to try increasing the trunklength parameter.  Maybe someone has ideas to make this sort of thing more automatic, but otherwise it takes some manual tweaking.  I hope this helps.

Kevin
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    On 05/21/2012 11:39 AM, Giovanni wrote:
    <blockquote cite="mid:201...@in..." type="cite">
      <pre wrap="">  Hi all! I'm experiencing a strange behaviour with sankey diagram. As
you can see from the attached image, the patch label it's not
positioned in the middle of the patch (as it should), but it's plotted
over the first label... The code is attached also.
Any hints?

Thanks,
  Giovanni</pre>
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Re: [Matplotlib-users] strange behaviour with sankey diagram (maybe a bug)

From: Giovanni <gio...@in...> - 2012-05-22 20:09:46

  lunedì 21 maggio 2012, 21:30, Kevin Davies:

> Hi Giovanni,
> 
> Thanks for your report.  It looks like in this case the "dip" in the
> large, single input caused the input label to be at the center of the
> diagram.  You might want to try increasing the trunklength
> parameter.  Maybe someone has ideas to make this sort of thing more
> automatic, but otherwise it takes some manual tweaking.

  Hi Kevin and thanks for replying. I've tried increasing the
trunklength parameter, but i can't get the patch label in the center.

Giovanni

Re: [Matplotlib-users] strange behaviour with sankey diagram (maybe a bug)

From: Giovanni <gio...@in...> - 2012-05-24 13:27:04

  martedì 22 maggio 2012, 18:33, Kevin Davies:

> Hi Giovanni,
> Do the labels still overlap to the same extent?  As far is the Sankey 
> code is concerned, the "center" is the center of the rectangle from 
> which the paths diverge.  That isn't necessarily the center of the 
> bounding box that encloses the entire Sankey subdiagram.  In this
> case, those "centers" are very different because the outflows diverge
> quite a bit, but the inflow doesn't diverge at all.  Does that
> explain what you are seeing?

  No, the labels are translated to the left (so approaching to the
center of the patch), but the rest of the layout it's getting worse.

> If you want to investigate further, you could turn on a debug routine
> by uncommenting a section of code that should be marked in the Sankey 
> class.  That routine will display the base points of each path.

  i can't live without patchlabel, so i've no interest in investigating
further (and probably neither the programming skill). Anyway i think
that a solution will be to calculate the centroid of the patch and use
it as a center for the label.

Thanks for explaining and four your hints!

G.