class_docstr: Click on a point to select and highlight it -- the data that
  generated the point will be shown in the lower Axes.  Use the 'n'
  and 'p' keys to browse through the next and previous points
class_docstr_tok: ["Click","on","a","point","to","select","and","highlight","it","--","the","data","that","generated","the","point","will","be","shown","in","the","lower","Axes",".","Use","the","'n'","and","'","p","'","keys","to","browse","through","the","next","and","previous","points"]
code: def on_pick(self, event):
      if event.artist != line:
          return True
  
      N = len(event.ind)
      if not N:
          return True
  
      # the click locations
      x = event.mouseevent.xdata
      y = event.mouseevent.ydata
  
      distances = np.hypot(x - xs[event.ind], y - ys[event.ind])
      indmin = distances.argmin()
      dataind = event.ind[indmin]
  
      self.lastind = dataind
      self.update()
  
imports: import numpy
label_desc: Use image node_id 3 for calling the PointBrowser obj's underlying member method code with example usage: obj.on_pick(event) and returns: True, True