code: def clicked(self, pts):
      print("clicked: %s" % pts)
  
file_path: pyqtgraph/pyqtgraph/examples/CustomGraphItem.py
imports: import numpy
  import pyqtgraph
  from pyqtgraph.Qt import QtCore
label_desc: Use image node_id 6 for calling the Graph obj's underlying member method code with example usage: obj.clicked(pts) without return types