On 1/29/12 8:42 AM, Benjamin Root wrote:
On Sunday, January 29, 2012, Fernando Perez <[email protected]
<mailto:[email protected]>> wrote:
> Hi all,
>
> in ipython for the qtconsole and notebook, we send inline figures using
>
> fig.canvas.print_figure(bytes_io, format=fmt, bbox_inches='tight')
>
> as seen here:
>
>
https://github.com/ipython/ipython/blob/master/IPython/core/pylabtools.py#L104
>
> However, this produces truncated figure titles. Consider this code:
>
> f, ax = plt.subplots()
> ax.plot(rand(100))
> ax.set_title('Axis title')
> f.suptitle('Figure title');
>
> ###
>
> which produces this in the notebook:
>
> http://img546.imageshack.us/img546/5448/selection001c.png
>
> As you can see, the figure title gets truncated.
>
> We started using bbox_inches='tight' because otherwise in many cases
> the images were coming back with insane amounts of white padding, and
> Stefan vdW suggested this fix. But it seems that in other cases it
> actually loses data, which is even worse...
>
> A slightly more complicated example, using basemap, not only truncates
> the title but also all the x and y labels:
>
> from mpl_toolkits.basemap import Basemap
>
> lon0, lat0, lon1, lat1 = (84.38, 26.22, 88.9, 29.8)
> resolution = 'i'
>
> parallels = np.linspace(lat0, lat1, 5)
> meridians = np.linspace(lon0, lon1, 5)
>
> f, ax = plt.subplots()
> m = Basemap(lon0, lat0, lon1, lat1, resolution=resolution, ax=ax)
> m.drawcountries(color=(1,1,0)) # country boundaries in pure yellow
> m.drawrivers(color=(0,1,1)) # rivers in cyan
> m.bluemarble() # NASA bluemarble image
> m.drawmeridians(meridians, labels=[0,0,0,1], fmt='%.2f')
> m.drawparallels(parallels, labels=[1,0,0,0], fmt='%.2f')
> f.suptitle('The Himalayas');
>
> #####
>
> produces:
>
> http://img192.imageshack.us/img192/986/selection002e.png
>
>
> This looks like a matplotlib bug, but I have no idea how easy it is to
> fix. In the meantime, should we in ipython just revert back to not
> using bbox_inches, or is there an alternative?
>
> Thanks!
>
> f
>
Not a bug. There are only so many artist objects we assume for
determining the tight bbox. Suptitle is not one of them. However, If
you collect all of the artists that you want considered, you can pass
in a list of them to bbox_artists (IIRC) to have them considered as well.
Now, with respect to the Basemap example, there might be a bug there,
but it can still be worked around by passing in the list of labels to
the kwarg.
Cheers!
Ben Root
The lat and lon labels in Basemap are axes.text objects, which
apparently are not considered when computing the bbox either.
-Jeff
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