def rgb_to_xy(self, red, green, blue):
        """Converts red, green and blue integer values to approximate CIE 1931
        x and y coordinates.
        """
        point = self.color.get_xy_point_from_rgb(red, green, blue)
        return (point.x, point.y)
Converts red, green and blue integer values to approximate CIE 1931
        x and y coordinates.