[yt-dev] Fwd: [yt_analysis/yt] annotate_image (issue #430)

[Sam Skillman]

Hi all,

So I got a bit ambitious and tried this idea of an ImageArray out, and so
far I really like it.  It is in my fork, and here are the differences:

https://bitbucket.org/samskillman/yt/compare/2c5e5476cd58..yt_analysis/yt:yt

With that in place, I can do the following:

http://paste.yt-project.org/show/2738/

This produces these images:
http://i.imgur.com/gdwYJ.png
and
http://i.imgur.com/tADlk.png

And spits out this for the keys/values for the ImageArray.info:
Ray casting100%
|||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Time: 00:00:00
fields ['x']
normal_vector [ 0.15205718  0.91234311 -0.38014296]
north_vector [ 0.06249512  0.37497071  0.92492774]
dataset /media/zz3/scratch/skillman/test_data/DD1701
width (1.5, 1.5, 1.5)
east_vector [-0.98639392  0.16439899  0.        ]
type rendering

This does all of the transposing and y-axis flipping that is necessary to
get back the images that you'd expect.

Anyways, I think I really like it, and I'm happy to PR this in, but even if
you guys don't like it I'm going to use it...a lot.  It does touch a bunch
of the cameras, so some testing should be done.

Nathan: I think this will help push it in the right direction since it will
give the necessary information to the image object returned from the
camera.  A thin wrapper that adds on TFs and such would be great!

Cheers,
Sam



On Fri, Sep 28, 2012 at 4:43 PM, Nathan Goldbaum <nathan12343 at gmail.com>wrote:

> Hi Sam and Matt,
>
> My preference would be to make some kind of wrapper for the camera that
> acts like a FixedResolutionBuffer object.  I mocked up something very
> similar for the OffAxisProjectionPlot which seems to work pretty well.
>
> In turn, it would then be pretty easy to mock of a VolumeRenderingPlot
> (which doesn't necessarily have to be based on plot window) to make fancy,
> annotated matplotlib plots based on images returned from the volume
> renderer.
>
> However, if someone wanted to just deal with bitmaps but still annotate
> them, a fix for this specific problem would be take the transpose out of
> write_bitmap and instead have it happen in the cython code that generates
> the image array in the first place or immediately after in
> camera.snapshot().  I'm not sure whether what Sam is envisioning would
> necessarily fix the issue with the transposed text since the image would
> still be written out with write_bitmap.
>
> Cheers,
>
> Nathan
>
> On Sep 28, 2012, at 12:30 PM, Sam Skillman wrote:
>
> Hi all,
>
> So one of the main reasons why this is so messy, IMO, is that we don't
> have a self-describing image.  All we have is a numpy array.  Would it
> worthwhile to do something like create an ImageArray, which subclasses
> numpy ndarray?
>
>
> http://docs.scipy.org/doc/numpy/user/basics.subclassing.html#simple-example-adding-an-extra-attribute-to-ndarray
>
> We could then append on things like x-axis, y-axis, optionally things like
> field names, and who knows what else?  For example:
>
> http://nbviewer.ipython.org/url/hub.yt-project.org/notebooks/2225815c19a844c9974838543f09e267.ipynb
>
> This would significantly help manage the rendering output since we lose
> info about the image as soon as we lose the camera.  We could additionally
> write a thin layer to save these images out in hdf5, looping over the info
> dictionary for attributes.
>
> Thoughts?
>
> Sam
>
> On Fri, Sep 28, 2012 at 1:00 PM, Matthew Turk <matthewturk at gmail.com>wrote:
>
>> Hi all,
>>
>> We got an anonymous bug today.  My guess is this is related to the
>> transpose in write_image.
>>
>> -Matt
>>
>>
>> ---------- Forwarded message ----------
>> From: Anonymous <issues-reply at bitbucket.org>
>> Date: Fri, Sep 28, 2012 at 7:32 AM
>> Subject: [yt_analysis/yt] annotate_image (issue #430)
>> To: matthewturk at gmail.com
>>
>>
>> --- you can reply above this line ---
>>
>> New issue 430: annotate_image
>> https://bitbucket.org/yt_analysis/yt/issue/430/annotate_image
>>
>> Anonymous:
>>
>> Text is transposed with annotate_image.
>>
>>
>> --
>>
>> This is an issue notification from bitbucket.org. You are receiving
>> this either because you are the owner of the issue, or you are
>> following the issue.
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