On Thu, Jun 21, 2012 at 4:09 PM, Andre' Walker-Loud <walksl...@gmail.com>wrote:
> Hi All,
>
> Sometimes, instead of using data points with error bars, I instead use
> fill_between to create a little bar, with a band which I use alpha=.3 or so.
>
> I have tried unsuccessfully to find an easy way to create a legend label
> for this band - I am trying to have a similar band appear in my legend.
>
> I am not attached to fill_between if there is a similar way to create such
> a "little bar" to represent my data point.
>
>
> Thanks,
>
> Andre
> ----------------------------------------------------------
>
> Hi Andre,
Unfortunately, I think the preferred method is to create a proxy artist:
http://matplotlib.sourceforge.net/users/legend_guide.html#using-proxy-artist
Basically, you draw a fake patch with the same parameters as your fill (see
example below).
Hope that helps,
-Tony
# example from
http://comments.gmane.org/gmane.comp.python.matplotlib.general/29476
def fill_between(x, y1, y2=0, ax=None, **kwargs):
"""Plot filled region between `y1` and `y2`.
This function works exactly the same as matplotlib's fill_between,
except
that it also plots a proxy artist (specifically, a rectangle of 0 size)
so that it can be added it appears on a legend.
"""
ax = ax if ax is not None else plt.gca()
ax.fill_between(x, y1, y2, **kwargs)
p = plt.Rectangle((0, 0), 0, 0, **kwargs)
ax.add_patch(p)
return p
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