[IPython-dev] Text output from matplotlib event not shown

[MinRK]

This is open as a GitHub Issue<https://github.com/ipython/ipython/issues/5407>.
As a result of cleaning up data structures when we think we are done, async
output is lost.

-MinRK


On Thu, Apr 17, 2014 at 11:56 PM, Antonino Ingargiola <tritemio at gmail.com>wrote:

> For the record, I tried running the plot from a qtconsole and the text
> output is correctly printed. So it is a notebook specific issue.
>
> Antonio
>
>
> On Thu, Apr 17, 2014 at 10:57 PM, Antonino Ingargiola <tritemio at gmail.com>wrote:
>
>> Hi,
>>
>> in IPython Notebook 1.x I built some QT matplotlib plots that allow to
>> select a range (with the mouse) and print to the range boundaries, or
>> related information.
>>
>>  To do that I connect a callback to the standard matplotlib events. The
>> callback draws a range highlight and prints the range info.
>>
>> In IPython 2.0 I can't get the print output anymore, although the range
>> is drawn and therefore I'm sure the callback is called. I thought that the
>> issue can be related to:
>>
>> https://github.com/ipython/ipython/issues/5408
>>
>> If this is the same issue, are they any workaround I can use to get the
>> output back?
>>
>> For completeness I attach the main class I use for the interactive range
>> selection:
>>
>> class GuiSelection(object):
>>     """Abstract class for range selection.
>>
>>     Methods on_press_draw(), on_motion_draw() and on_release_print() must
>>     be overloaded by children classes.
>>     """
>>     def __init__(self, fig, ax, debug=False):
>>         self.ax = ax
>>         self.fig = fig
>>         self.pressed = False
>>         self.debug = debug
>>         self.id_press = fig.canvas.mpl_connect('button_press_event',
>>                                                 self.on_press)
>>         if self.debug:
>>             print 'Figure:', fig, '\nAxis:', ax
>>     def on_press(self, event):
>>         if event.inaxes != self.ax: return
>>         self.pressed = True
>>         self.xs, self.ys = event.xdata, event.ydata
>>         if self.debug:
>>             pprint('PRESS button=%d, x=%d, y=%d, xdata=%f, ydata=%f\n' % (
>>                 event.button, event.x, event.y, event.xdata, event.ydata))
>>         self.on_press_draw()
>>         self.fig.canvas.draw()
>>         self.id_motion =
>> self.fig.canvas.mpl_connect('motion_notify_event',
>>                                                      self.on_motion)
>>         self.fig.canvas.mpl_connect('button_release_event',
>>                                              self.on_release)
>>
>>     def on_motion(self, event):
>>         if event.inaxes != self.ax: return
>>         if self.debug:
>>             pprint('MOTION x=%d, y=%d, xdata=%f, ydata=%f\n' % (
>>                 event.x, event.y, event.xdata, event.ydata))
>>         self.xe, self.ye = event.xdata, event.ydata
>>         self.on_motion_draw()
>>         self.fig.canvas.draw()
>>
>>     def on_release(self, event):
>>         if not self.pressed: return
>>         self.pressed = False
>>         if self.debug:
>>             pprint('RELEASE button=%d, x=%d, y=%d, xdata=%f, ydata=%f\n'
>> % (
>>                 event.button, event.x, event.y, event.xdata, event.ydata))
>>         self.fig.canvas.mpl_disconnect(self.id_motion)
>>         self.on_release_print()
>>
>>     def on_press_draw(self):
>>         pass
>>
>>     def on_motion_draw(self):
>>         pass
>>
>>     def on_release_print(self):
>>         pass
>>
>>
>
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