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

[Eric F. <ef...@ha...>]

On 2015/01/27 6:51 AM, Mark wrote:
> 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?

I think you are correct.  John Hunter explicitly avoided the temptation 
to keep adding backend-independent widgets to mpl; we have a hard enough 
time trying to maintain and improve the plotting capabilities without 
trying to turn mpl into a wxwidgets work-alike.  If you need more than 
the very minimal widgets presently on offer, you have to choose a gui 
toolkit and use it directly, embedding matplotlib in it.

Eric

>
> Sent from my iPhone
>
> On Jan 27, 2015, at 17:34, Paul Hobson <pmh...@gm...
> <mailto: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...
>> <mailto: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... <mailto: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... <mailto: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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>
>
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