The plots are transparent and therefore this function is required to cover up the middle
        part of the plots (that contains text). This function creates white circles that provide
        background.

def draw_white_circles(self):
        """
        The plots are transparent and therefore this function is required to cover up the middle
        part of the plots (that contains text). This function creates white circles that provide
        background.
        """
        for atom in sorted(self.molecule.nearest_points_coords.keys()):
                self.white_circles = self.white_circles+"<circle cx='"+str(int(self.molecule.nearest_points_coords[atom][0]))+"' cy='"+str(int(self.molecule.nearest_points_coords[atom][1]))+"' r='55' fill='white' />"