On Thu, Jan 26, 2012 at 3:24 PM, Jerzy Karczmarczuk <
jerzy.karczmarc...@unicaen.fr> wrote:
> Does anybody know how to generate and process my "private" events? I can
> subclass the Event() class, say, MyEvent,
> with a name "my_event", and I can -
> canvas.mpl_connect('my_event', aCallback)
>
> but then, how to fire one? (I don't want to call the callback directly).
>
>
> Suppose that the interface, when show() is active launches a
> simulation/visualisation program which animates many things in its
> figure. From time to time something "special" appears, and its behaviour
> should be steered by those private events.
>
> (Yes, I know that I can do it in several other ways, or write my own
> event-processing loop, or use directly wxPython or PyGTK instead of
> Matplotlib. So, I don't need the replacement solution, but just a way to
> fire events within Matplotlib...)
>
> Thank you.
>
> Jerzy Karczmarczuk
> Caen, France
>
>
It is smart to simply re-use mpl's event callback system. Luckily, in the
latest release, we allowed for arbitary events to be added. To answer your
question, take a look at how pick_event() is declared in backend_bases.py:
def pick_event(self, mouseevent, artist, **kwargs):
"""
This method will be called by artists who are picked and will
fire off :class:`PickEvent` callbacks registered listeners
"""
s = 'pick_event'
event = PickEvent(s, self, mouseevent, artist, **kwargs)
self.callbacks.process(s, event)
The function that "fires" the event is "self.callbacks.process(s, event)",
where "self" is the figure canvas.
I hope this helps!
Ben Root
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