rootpy matplotlib

[Peter Waller]

Hi James,

I'm a little busy right now and I don't have experience which can immediately help you answer this. I've forwarded your question on to rootpy-users. I hope someone else can respond.

Best of luck,

- Peter

---------- Forwarded message ----------
From: James Robinson <james.r...@cern.ch>
Date: 19 June 2013 14:34
Subject: rootpy
To: Pete Waller <p...@pwaller.net>

[snip]

I've just switched to using rootpy for plotting and I have a
matplotlib question. If I plot a histogram with rplt.hist in a 'line'
style rather than a 'filled' style, can I get the legend to display a
line rather than a box? I know I can do this if I write my own wrapper
around this that adds a proxy-artist, but it looks like rplt is
already giving me a matplotlib.patches.Polygon object - is there a
nice way to get the legend to draw this in the same way as a Line2D.

[snip]

[Noel Dawe]

Hi James,

Thanks for pointing this out. root2matplotlib.hist() now creates the appropriate proxy artist for the legend based on the legendstyle attribute of each histogram:

https://github.com/rootpy/rootpy/pull/340

If legendstyle = 'F' then a Rectangle proxy artist is used, otherwise a Line2D is used.

Also hist() now uses fill_between() and step() to separately fill the patch (if filled) and draw the upper edge to prevent the lower line of a histogram patch (along the x-axis) from being drawn:

http://stackoverflow.com/questions/16862501/draw-a-step-histogram-without-closing-the-polygon-with-the-bottom-line

Cheers,

Noel

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[Noel Dawe]

I also noticed that matplotlib places lines above patches by default in the legend so if you want a specific order in your legend (maybe to match the order in a stack for example) you may need to specify the order manually:

http://matplotlib.org/users/legend_guide.html#adjusting-the-order-of-legend-items

Noel

[Noel Dawe]

Hi James,

You will need to register in the rootpy-users google group to post:

https://groups.google.com/forum/?fromgroups#!forum/rootpy-users

Noel

On Thu, Jun 20, 2013 at 1:01 AM, James Robinson <james.em...@gmail.com> wrote:

Hi Noel,

Thanks for the quick response! As I said in a earlier email (which seems to have bounced from the rootpy-users group) I implemented this in a horrible hack-y proxy artist way. I'll look into switching to this later today. The ordering thing is annoying, but I have a function that reorders the labels and handles for the legend so this is OK.

Thanks again,
James