Re: [Matplotlib-users] Hiding data via legend

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

Hi,

I am a bit surprised that a line that isn't visible remains pickable
by default :

        # toggle line visibility:
        vis = not line.get_visible()
        line.set_visible(vis)
        # by default a line would remain pickable even if not visible :
        if vis : line.set_picker(5)
        else : line.set_picker(None)

I've attached my line + legend picker example, in case it is of any
use to anybody.


On Mon, Sep 28, 2009 at 3:43 AM, John Hunter <jd...@gm...> wrote:
> On Sun, Sep 27, 2009 at 3:45 PM, Peter Butterworth <bu...@gm...> wrote:
>> 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:
>
> Most of the enhancements to support legend picking happened after 99.0
> -- you probably need to be on svn trunk (I don't think 99.1 would work
> either).  The example is working fine for me on svn HEAD (regardless
> of ncol) with one exception: if I use a marker instead of a line, the
> alpha is not respected (the line markers are simply turned off).
> Apparently we need to fix Line2D to respect the alpha setting for
> markers in this use case.
>
> JDH
>
>>
>>
>>
>>> 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)
>>
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>



-- 
thanks,
peter butterworth