Re: [Matplotlib-users] Hiding data via legend

[Peter B. <bu...@gm...>]

On Sun, Sep 27, 2009 at 9:31 PM, Jae-Joon Lee <lee...@gm...> wrote:
>> Some feedback: If plotting a line2D as discrete points rather than a
>> continuous line, you must use numpoints=2 for the legend picking to actually
>> occur on the points. The alpha blending doesn't work on the legend symbols
>> however.
>>
>
> I tried numpoints=1,2,3 but all worked for me. Can someone else confirm this?

I'm using windows and mpl 0.99.0:
numpoints=2 or 3 work
with numpoints=1 the pick does not occur on the symbol but where it
would be with numpoints=2



> The alpha for legend symbols does not work since, inside legend, the
> lines and symbols are drawn by different artists.
>
> Try something like below.
>
>
>        legline.set_alpha(1.0)
>        try:
>            legline._legmarker.set_alpha(1.0)
>        except AttributeError:
>            pass
>
>
>
>> Is there any other way, I can show in the legend whether the points of the
>> series are visible or not ?
>>
>> I thought of changing the labels, but failed to get them to redraw.
>>
>
> Legend.get_texts() method returns the list of Text instances.
>
> http://matplotlib.sourceforge.net/api/artist_api.html?highlight=legend#matplotlib.legend.Legend.get_texts
>
> You may modify the returned Text instances.
>
> -JJ
>

works great.



>
>> # plots:
>> ax.plot(t, y1, 'ro', picker=5, label='lab1')
>> ax.plot(t, y2, 'bo', picker=5, label='lab2')
>>
>> # legend
>> leg = ax.legend(loc='upper left', numpoints=2, fancybox=True, shadow=True)
>> lines, labels = ax.get_legend_handles_labels()
>>
>> # Enable picking on the legend lines
>> leglines=leg.get_lines()
>> for legline in leglines: legline.set_picker(5)