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

[Mark <ma...@gm...>]

ginput works fine in a GUI window, but there is no matplotlib widget where I can type text or numbers in a box. Like the FloatTextWidget in IPython. Or am I missing something?

Sent from my iPhone

> On Jan 27, 2015, at 17:34, Paul Hobson <pmh...@gm...> wrote:
> 
> 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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