[matplotlib-devel] Feature Freeze for 1.3 today

[Michael Droettboom]

Today is the day scheduled to be the feature freeze for 1.3.0.

We should get all PRs that are close to ready for inclusion tagged as 
1.3.0 (or 1.3.x blocker if they represent a serious bug).

At the moment, we have 8 blocker bugs, of which only 3 of which seem to 
require much much effort at this point.  We have 27 non-blocker PRs.

I probably won't create a 1.3.x branch just yet, so things for 1.3.0 can 
just get merged into master for now, and things that are for post-1.3.0 
should be held off for the time being.  Once we have the PRs down to a 
manageable number, I will create a branch and let everyone know here.

Thanks again for all your help, and I look forward to seeing you at Scipy!

Mike

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[matplotlib-devel] Quadmesh with alpha without the nasty edge effects

[Phil Elson]

I can't work out if I'm having a brain block or it really can't be done,
but I'm trying to produce a pcolormesh with alpha without the nasty edges
seen in the attached image


[image: Inline images 1]

The code to reproduce:

import matplotlib.pyplot as plt
import numpy.random

d = numpy.random.random([10, 10])
plt.pcolormesh(d, alpha=0.5, vmin=0, vmax=10)
plt.show()


I've tried several things, including:

   - Setting antialiased=False
   - Fiddling with the returned pcolormesh's _is_stroked attribute
   - Rasterizing
   - Setting the edgecolor to 'face'

Pcolorfast is one option, but I was ideally hoping to achieve this with
pcolormesh.

Any thoughts?
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Re: [matplotlib-devel] Quadmesh with alpha without the nasty edge effects

[Benjamin Root]

On Mon, May 13, 2013 at 9:58 AM, Phil Elson  wrote:

> I can't work out if I'm having a brain block or it really can't be done,
> but I'm trying to produce a pcolormesh with alpha without the nasty edges
> seen in the attached image
>
>
The issue is that the quads are overlapping just slightly.  Any solution to
this has to be to make them not overlap at all.  This is an old problem, to
be sure.

Ben Root
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Re: [matplotlib-devel] Quadmesh with alpha without the nasty edge effects

[Michael Droettboom]

Yeah -- I think it's a known bug (though not sure if it's in the tracker).

The solution is probably to do something like the compound path 
rendering you (Phil) have experimented with, or, perhaps more easily, 
rendering without alpha to a temporary image buffer and then compositing 
it with alpha in a single step.


Mike

On 05/13/2013 10:14 AM, Benjamin Root wrote:




On Mon, May 13, 2013 at 9:58 AM, Phil Elson > wrote:


I can't work out if I'm having a brain block or it really can't be
done, but I'm trying to produce a pcolormesh with alpha without
the nasty edges seen in the attached image


The issue is that the quads are overlapping just slightly.  Any 
solution to this has to be to make them not overlap at all.  This is 
an old problem, to be sure.


Ben Root




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[matplotlib-devel] SciPy BOF

[Damon McDougall]

All,

Here's the site where we can suggest a BoF at the SciPy conference:
http://conference.scipy.org/scipy2013/bofs.php?utm_source=buffer&utm_medium=twitter&utm_campaign=Buffer&utm_content=bufferce96b

We should do an mpl BoF and toss around ideas.

Best wishes,
Damon

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