old_contents: from . animation import BaseAnimation
  from .. layout import Matrix
  
  
  class BaseMatrixAnim(BaseAnimation):
  
      def __init__(self, layout, width=0, height=0, startX=0, startY=0):
          super().__init__(layout)
          if not isinstance(layout, Matrix):  # pragma: no cover
              raise RuntimeError('Must use bibliopixel.layout.Matrix with ' +
                                 'Matrix Animations!')
  
          self.width = width or layout.width
          self.height = height or layout.height
  
          self.startX = startX
          self.startY = startY
  
new_contents: from . animation import BaseAnimation
  from .. layout import Matrix
  
  
  class BaseMatrixAnim(BaseAnimation):
  
      def __init__(self, layout, width=0, height=0):
          super().__init__(layout)
          if not isinstance(layout, Matrix):  # pragma: no cover
              raise RuntimeError('Must use bibliopixel.layout.Matrix with ' +
                                 'Matrix Animations!')
  
          self.width = width or layout.width
          self.height = height or layout.height
  
subject: Remove startX and startY (fix #318)