code: def __init__(self):
      self.nrows = -1
      self.ncols = -1
      self.pointsarray = Qt.internals.PrimitiveArray(QtCore.QPointF, 2)
      self.resize(0, 0)
  
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 1 to create a new QuadInstances object  with example: obj = QuadInstances()