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.
code: def visual(self, v):
      self._visual = v
      self._pos = None
  
file_path: vispy/vispy/scene/events.py
imports: from __future__ import division
  from ..util.event import Event
label_desc: Use image node_id 3 for calling the SceneMouseEvent obj's underlying member method code with example usage: obj.visual(v) without return types