def ellipse(origin_x, origin_y, width, height, arc_start, arc_end)
      primitive 'ellipse ' + format('%g,%g %g,%g %g,%g',
                                    origin_x, origin_y, width, height, arc_start, arc_end)
    end
def ellipse(origin_x, origin_y, width, height, arc_start, arc_end)
      primitive 'ellipse ' + format('%g,%g %g,%g %g,%g',
                                    origin_x, origin_y, width, height, arc_start, arc_end)
    end
Draw an ellipse