class_docstr: **Bases:** :class:`GraphicsObject <pyqtgraph.GraphicsObject>`
class_docstr_tok: ["*","*","Bases",":","*","*",":","class",":","`","GraphicsObject","<","pyqtgraph.GraphicsObject",">","`"]
code: def boundingRect(self):
      xmn, xmx = self.dataBounds(ax=0)
      if xmn is None or xmx is None:
          return QtCore.QRectF()
      ymn, ymx = self.dataBounds(ax=1)
      if ymn is None or ymx is None:
          return QtCore.QRectF()
  
      px = py = 0
      pxPad = self.pixelPadding()
      if pxPad > 0:
          # determine length of pixel in local x, y directions
          px, py = self.pixelVectors()
          px = 0 if px is None else px.length()
          py = 0 if py is None else py.length()
          # return bounds expanded by pixel size
          px *= pxPad
          py *= pxPad
  
      return QtCore.QRectF(
          xmn - px, ymn - py, (2 * px) + xmx - xmn, (2 * py) + ymx - ymn
      )
  
imports: import numpy
  from ..None import Qt, colormap
  from ..None import functions
  from ..Qt import QtCore, QtGui
  from .GraphicsObject import GraphicsObject
label_desc: Use image node_id 18 for calling the PColorMeshItem obj's underlying member method code with example usage: obj.boundingRect() and returns: QtCore, QtCore, QtCore