access to my underlying data from within picker or pick_handler

Community matplotlib-users
1

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()
   
[/code]

thanks in advance for any pointers.

···

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2

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

···

On Mon, Mar 12, 2012 at 11:05 PM, gsal <salgerman@…1003…7…> 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()

3

Thanks. That did the trick.

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