On Mon, Mar 12, 2012 at 11:05 PM, gsal <salger...@gmail.com> wrote:
>
> I am trying to change the underlying data for my plot via a pick event,
> except that the matplotlib examples for picking show a couple of functions
> with predefined signatures and I can't seem to figure out how to modify my
> data from within those functions...how to do it?
>
> Here is a minimal example of what I am trying to do:
>
> [code]
> import matplotlib.pyplot as plt
>
> def pick_rlines(art,mouseevent):
> button = mouseevent.button
> key = mouseevent.key
>
> wsf.nnn = 4 # <-- how to modify wsf.nnn from here?
> print "wsf.nnn = ", wsf.nnn
> props = dict(nnn=wsf.nnn)
> return True, props
>
> def pick_handler(event):
> mouseevent = event.mouseevent
> button = mouseevent.button
> key = mouseevent.key
> art = event.artist
>
> wsf.nnn = event.nnn # <-- or from here ?
>
> class AAA():
> pass
>
> class BBB():
> def __init__(self):
> pass
>
> wsf=AAA() # when it is defined here?
> wsf.nnn=0
> GR = [1.0, 2.0, 3.0, 4.0]
>
> fig = plt.figure()
> ax = fig.add_axes([0.1,0.1,0.75,0.75])
> ax.set_aspect(1)
> rlines = ax.hlines(GR,0.0,4.0,picker=pick_rlines)
> fig.canvas.mpl_connect('pick_event', pick_handler)
> plt.show()
>
> if __name__ == '__main__':
> the = BBB()
In the code as you've written it, "the" is in the global namespace, and so
your pick event handlers can see that variable. So you could write:
def pick_rlines(art,mouseevent):
button = mouseevent.button
key = mouseevent.key
the.wsf.nnn = 4 # "the" is in the global namespace
But a cleaner design would be to make the pick handler a class method of
class "BBB", eg
class BBB:
def __init__(self):
self.fig = blah_blah...
self.fig.canvas.mpl_connect('pick_event', self.pick_handler)
self.wsf = blah_blah...
def pick_handler(self, artist, event):
self.wsf.nnn = 4 # wsf is in the class namespace
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