Re: [matplotlib-devel] Bug in print_figure with bbox_inches='tight'? Plots in ipython notebook losing titles and labels...

[Jeff W. <js...@fa...>]

On 1/29/12 8:42 AM, Benjamin Root wrote:
>
>
> On Sunday, January 29, 2012, Fernando Perez <fpe...@gm... 
> <mailto:fpe...@gm...>> 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