Re: [Matplotlib-users] pick event for images

[Joe K. <jof...@gm...>]

On Oct 30, 2013 9:43 AM, "Nils Wagner" <ni...@go...> wrote:
>
> Hi all,
>
> How can I retrieve the corresponding "color value" in percent, when I
click on the image ?
>

You have to jump through a couple of hoops.

Have a look at the _coords2index function in pick_info.py for
mpldatacursor.
https://github.com/joferkington/mpldatacursor/blob/master/mpldatacursor/pick_info.py

Also, mpldatacursor might be useful for what you're doing. Not to plug my
own project too much, but it does exactly this, among other things.

Hope that helps!
-Joe

> fig = plt.figure()
> ax  = fig.add_subplot(111)
> cax = ax.imshow(col[:,::2], interpolation='nearest',extent=[0.5,20.5,0.5,2
> 0.5],alpha=1,picker=5)
>
> fig.canvas.mpl_connect('pick_event', onpick)
>
> def onpick(event):
>  ...
>
>
> Nils
>
>
>
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