Re: [Matplotlib-users] How to plot only a legend?

[Damon M. <dam...@gm...>]

On Thu, Jul 26, 2012 at 06:05:39PM +0200, Andreas Hilboll wrote:
> > Hi Andreas,
> >
> > 2012/7/26 Andreas Hilboll <li...@hi...>:
> >> Hi,
> >>
> >> I would like to create a figure which only contains a legend, and no
> >> axes
> >> at all. I would like to manually assign the colors. I found this here:
> >>
> >>    http://stackoverflow.com/a/3302666
> >>
> >> but from there on, I'd like to remove the axes, and put the legend into
> >> three columns.
> >
> > If the plot attached it's fine for you it's easy:
> >
> > import matplotlib.pyplot as plt
> > ax = plt.subplot()  #create the axes
> > ax.set_axis_off()  #turn off the axis
> > ....  #do patches and labels
> > ax.legend(patches, labels, ...)  #legend alone in the figure
> > plt.show()
> >
> > Cheers,
> > Francesco
> 
> That's really easy :) I could live with this solution, applying some
> external tool like pdfcrop to the result. Of course, it would be nicer if
> the PDF's page size would be exactly that of the legend (plus some
> margin), so that I wouldn't have to resort to external tools ...
> 
> Any ideas?
>

How about

plt.savefig('roflcakes.png', bbox_inches='tight', pad_inches=0.1)

Since the other artists are invisible, that should crop to just your
legend. I'm assuming matplotlib updates the BoundingBox such that it
doesn't include invisible artists.

> 
> Cheers, A.
> 
> 
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-- 
Damon McDougall
http://damon-is-a-geek.com
B2.39
Mathematics Institute
University of Warwick
Coventry
West Midlands
CV4 7AL
United Kingdom