code: def _connect_controls(self):
      self._controls.colormap_chooser.currentTextChanged.connect(
          self._canvas_wrapper.set_image_colormap
      )
      self._controls.line_color_chooser.currentTextChanged.connect(
          self._canvas_wrapper.set_line_color
      )
  
file_path: vispy/examples/scene/realtime_data/ex02_control_vispy_from_qt.py
imports: import numpy
  from PyQt5 import QtWidgets
  from vispy.scene import SceneCanvas, visuals
  from vispy.app import use_app
label_desc: Use image node_id 2 for calling the MyMainWindow obj's underlying member method code with example usage: obj._connect_controls() without return types