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Re: [matplotlib-devel] ginput in nbagg backend to use in IPython Notebooks
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From: Thomas C. <tca...@gm...> - 2015-01-27 17:52:07
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I would keep an eye on scikit-image and their viewer work. One of the
drivers behind Steven working on the nbagg backend was prep work to port
their imageviewer code over to using nbagg from than qt.
I think it is also possible to interact between ipython widgets and
figure/axes objects with nbagg.
Tom
On Tue Jan 27 2015 at 12:20:32 PM Eric Firing <ef...@ha...> wrote:
> 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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