[yt-users] saving files with a different resolution

[Matthew Turk]

Hi Luigi,

I think I have tracked it down.  The issue only shows up when the
aspect ratio of the axes object -- the image itself -- is not 1.0.
What seems to have happened is that there is confusion in the contour
callback object (as well as the grid boundary callback, so I would be
unsurprised if you saw these same issues there) as to which axis is x
and which is y.  I believe this is my fault, dating back quite some
time -- fortunately, as you point out, it's very obvious (and should
result in broken contours at the edges.)

What tipped me off to this was your statement about the figure sizes
-- this shouldn't be directly used, but instead only used indirectly
via seeing how big (canvas-space) the axes object is inside the
contouring code.  Running with a fig_size like (20,16) that ensures
aspect ratio of 1.0 in the axes object (allowing 20% for colorbar on
the figure itself) worked, so that theory started to pan out.  I have
tested with fig_size = (12,9) as well, and this fix works.

If you could try changing lines 153 and 154 of yt/raven/Callbacks.py
to be "dy =" and "dx =" instead of "dx =" and "dy =" that would be a
great help.  If that works for you, I'll commit it to the repository.

Thanks very much for this report, and I hope this works out.

-Matt

On Wed, Mar 31, 2010 at 1:53 AM, Luigi Iapichino
<luigi at ita.uni-heidelberg.de> wrote:
> Hi Matt,
>
> both methods work, but I have a further problem: if I try to add density
> contours, they appear in the plot, but they are not superimposed at the
> correct location. They look like shifted, and I suppose that
>
> p.modify["contour"]("Density", ncont=5,take_log=True)
>
> does not "see" that I changed the size of the figure.
> Am I missing something?
> Thanks,
>
>  Luigi
>
> On Tuesday 30 March 2010, Matthew Turk wrote:
>> Hi Luigi,
>>
>> Yup, you'll just need to provide it with a new "figure".  In
>> matplotlib, figures are the background - the entire image, if you will
>> - and "axes" are individual plot elements on that.  Here we're going
>> to create a figure with 100 dpi that's 12 inches by 9 inches -- this
>> should be 1200 by 900 pixels:
>>
>> fig = raven.matplotlib.figure.Figure(dpi = 100, figsize = (12, 9))
>> p = pc.add_projection("Temperature", 0, weight_field="Density")
>>
>> That's the slightly harder way -- you'll have to generate a new Figure
>> object for every plot.  There's a shortcut in yt already, though, that
>> accepts a figsize=(width, height) argument, where width and height are
>> in inches:
>>
>> p = pc.add_projection("Temperature", 0, weight_field="Density",
>> fig_size=(20, 16))
>>
>> if you wanted 2000 by 1600 pixels.
>>
>> Does that help out?
>>
>> Best,
>>
>> Matt
>>
>> On Tue, Mar 30, 2010 at 7:47 AM, Luigi Iapichino
>>
>> <luigi at ita.uni-heidelberg.de> wrote:
>> > Dear all,
>> >
>> > in one of my scripts I have something like this:
>> >
>> >    pc = PlotCollection(pf, center=[0.5,0.5,0.5])
>> >
>> >    p = pc.add_projection("Temperature", 0, weight_field="Density")
>> >    p.modify["contour"]("Density", ncont=5, take_log=True)
>> >    ...
>> >    ...
>> >    ...
>> >    pc.save("%s_temp-proj" % pf,override=True)
>> >
>> > The saved file has a resolution of 800x800. Is there a way to change this
>> > number in YT? I had a look in the PlotCollection class, but I haven't
>> > found what I'm searching.
>> >
>> > Looking forward to your suggestions,
>> > Cheers
>> >
>> >  Luigi
>> >
>> > --
>> >
>> > ---------------------------------------------------------------
>> >
>> > Luigi Iapichino
>> > Zentrum fuer Astronomie der Universitaet Heidelberg
>> > Institut fuer Theoretische Astrophysik
>> > Albert-Ueberle-Str. 2, D-69120 Heidelberg, Germany
>> > Tel: +49 6221 548983, Fax: +49 6221 544221
>> > e-mail: luigi at ita.uni-heidelberg.de
>> > URL: http://www.ita.uni-heidelberg.de/~luigi/
>> > _______________________________________________
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>
>
> --
>
> ---------------------------------------------------------------
>
> Luigi Iapichino
> Zentrum fuer Astronomie der Universitaet Heidelberg
> Institut fuer Theoretische Astrophysik
> Albert-Ueberle-Str. 2, D-69120 Heidelberg, Germany
> Tel: +49 6221 548983, Fax: +49 6221 544221
> e-mail: luigi at ita.uni-heidelberg.de
> URL: http://www.ita.uni-heidelberg.de/~luigi/
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