code: def _getNormalizedCoords(self):
      def asarray(x):
          if x is None or np.isscalar(x) or isinstance(x, np.ndarray):
              return x
          return np.array(x)
  
      x = asarray(self.opts.get("x"))
      x0 = asarray(self.opts.get("x0"))
      x1 = asarray(self.opts.get("x1"))
      width = asarray(self.opts.get("width"))
  
      if x0 is None:
          if width is None:
              raise Exception("must specify either x0 or width")
          if x1 is not None:
              x0 = x1 - width
          elif x is not None:
              x0 = x - width / 2.0
          else:
              raise Exception(
                  "must specify at least one of x, x0, or x1"
              )
      if width is None:
          if x1 is None:
              raise Exception("must specify either x1 or width")
          width = x1 - x0
  
      y = asarray(self.opts.get("y"))
      y0 = asarray(self.opts.get("y0"))
      y1 = asarray(self.opts.get("y1"))
      height = asarray(self.opts.get("height"))
  
      if y0 is None:
          if height is None:
              y0 = 0
          elif y1 is not None:
              y0 = y1 - height
          elif y is not None:
              y0 = y - height / 2.0
          else:
              y0 = 0
      if height is None:
          if y1 is None:
              raise Exception("must specify either y1 or height")
          height = y1 - y0
  
      # ensure x0 < x1 and y0 < y1
      t0, t1 = x0, x0 + width
      x0 = np.minimum(t0, t1, dtype=np.float64)
      x1 = np.maximum(t0, t1, dtype=np.float64)
      t0, t1 = y0, y0 + height
      y0 = np.minimum(t0, t1, dtype=np.float64)
      y1 = np.maximum(t0, t1, dtype=np.float64)
  
      # here, all of x0, y0, x1, y1 are numpy objects,
      # BUT could possibly be numpy scalars
      return x0, y0, x1, y1
  
imports: import numpy
  from ..None import functions
  from ..None import getConfigOption
  from ..None import Qt
  from ..Qt import QtCore, QtGui
  from .GraphicsObject import GraphicsObject
label_desc: Use image node_id 5 for calling the BarGraphItem obj's underlying member method code with example usage: obj._getNormalizedCoords() and returns: x0,  y0,  x1,  y1, np, x