code: def add_point_region(self, y: float, x: float) -> Graphic:
          
          graphic = Graphics.PointGraphic()
          graphic.position = Geometry.FloatPoint(y, x)
          self.__display_item.add_graphic(graphic)
          return Graphic(graphic)
docs: Add a point graphic to the data item.
  
          :param x: The x coordinate, in relative units [0.0, 1.0]
          :param y: The y coordinate, in relative units [0.0, 1.0]
          :return: The :py:class:`nion.swift.Facade.Graphic` object that was added.
  
          .. versionadded:: 1.0
  
          Scriptable: Yes