class_docstr: Displays regularly spaced grid lines in any coordinate system and at
  any scale.
  
  Parameters
  ----------
  scale : tuple
      The scale factors to apply when determining the spacing of grid lines.
  color : Color
      The base color for grid lines. The final color may have its alpha
      channel modified.
code: def size(self):
      return (1, 1)
  
file_path: vispy/vispy/visuals/gridlines.py
imports: from __future__ import division
  from .image import ImageVisual
  from ..color import Color
  from .shaders import Function
label_desc: Use image node_id 2 for calling the GridLinesVisual obj's underlying member method code with example usage: obj.size() and returns: int,  int