code: def _coverage(dmin, dmax, lmin, lmax):
      return (
          1
          - 0.5
          * ((dmax - lmax) ** 2 + (dmin - lmin) ** 2)
          / (0.1 * (dmax - dmin)) ** 2
      )
  
imports: import math
  import numpy
  from .visual import CompoundVisual, updating_property
  from .line import LineVisual
  from .text import TextVisual
label_desc: Use image node_id 2 for calling a global function with example usage: _coverage(dmin, dmax, lmin, lmax) and returns: unknown