Re: [matplotlib-devel] ginput in nbagg backend to use in IPython Notebooks

[Paul H. <pmh...@gm...>]

I'm 99% sure you can do this in a GUI window. Does your solution have to be
in the notebook?

On Tue, Jan 27, 2015 at 12:37 AM, Mark Bakker <ma...@gm...> wrote:

> Thanks, Tom.
>
> I want to use ginput to draw a straight line on a graph.
> The line is used to select a cross-section of a contour plot.
>
> I was afraid it wasn't going to be easy.
>
> Getting to it from the other side, is there a matplotlib widget in the
> works where I can type text or numbers in a box? Like the FloatTextWidget
> in IPython?
>
> Problem is I want to make a small GUI that includes both a text widget
> (which is available in IPython) and a 'select points in graph' widget like
> ginput in matplotlib.
>
> Mark
>
>
> On Mon, Jan 26, 2015 at 11:47 PM, Thomas Caswell <tca...@gm...>
> wrote:
>
>> nbagg is always running in the IPython event loop (as I understand it),
>> so I am not sure how to integrate that with the blocking.
>>
>> On the 1.4.x/master branch we have support for (almost, one PR still
>> pending) all mouse and keyboard events so all of the mpl widgets should
>> work (big thanks to Steven Silvester).  T
>>
>> What do you want to use that relies on ginput?
>>
>> You can fake up a non-blocking version something like:
>>
>> from collections import deque
>> ```
>> class accumulator(object):
>>     def __init__(self, n=5):
>>         self.list_of_points = deque(maxlen=n)
>>
>>     def on_event(self, event):
>>         self.list_of_points.append(event)
>>
>> import matplotlib
>> import itertools
>> import numpy as np
>> matplotlib.use('nbagg')
>> import matplotlib.pyplot as plt
>> plt.close('all')
>> fig, ax = plt.subplots()
>> x = np.linspace(0,10,10000)
>> y = np.sin(x)
>> ln, = ax.plot(x,y)
>>
>> dd = accumulator(15)
>> fig.canvas.mpl_connect('button_press_event', dd.on_event)
>> plt.show()
>> ```
>>
>> and then get the points by
>>
>> ```
>> dd.lest_of_points
>> ```
>>
>> This code obviously needs lots of bells and whistles, but points in the
>> right direction.
>>
>> Tom
>>
>> On Mon Jan 26 2015 at 2:45:45 PM Mark Bakker <ma...@gm...> wrote:
>>
>>> Hello List,
>>>
>>> Are there any plans to make ginput work in the nbagg backend?
>>>
>>> It would be so cool if I could use that in an IPython Notebook together
>>> with the other widgets.
>>>
>>> Thanks,
>>>
>>> Mark
>>> ------------------------------------------------------------
>>> ------------------
>>>
>>
>
>
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