class_docstr: Represents a mouse event that occurred on a SceneCanvas. This event is
  delivered to all entities whose mouse interaction area is under the event.
docstr: The position of this event in the local coordinate system of the
  visual.
docstr_tok: ["The","position","of","this","event","in","the","local","coordinate","system","of","the","visual","."]
code: def pos(self):
      """The position of this event in the local coordinate system of the
      visual.
      """
      if self._pos is None:
          tr = self.visual.get_transform("canvas", "visual")
          self._pos = tr.map(self.mouse_event.pos)
      return self._pos
  
file_path: vispy/vispy/scene/events.py
imports: from __future__ import division
  from ..util.event import Event
label_desc: Use image node_id 4 for calling the SceneMouseEvent obj's underlying member method code with example usage: obj.pos() and returns: self