class_docstr: Visual displaying windbarbs.
code: def _prepare_draw(self, view):
      view.view_program["u_px_scale"] = view.transforms.pixel_scale
      view.view_program["u_scale"] = 1
  
file_path: vispy/vispy/visuals/windbarb.py
imports: import numpy
  from vispy.color import ColorArray
  from vispy.gloo import VertexBuffer
  from vispy.visuals.shaders import Variable
  from vispy.visuals.visual import Visual
label_desc: Use image node_id 4 for calling the WindbarbVisual obj's underlying member method code with example usage: obj._prepare_draw(view) without return types