public function svgEllipse($x0, $y0, $rx, $ry, $style)
    {
        // get the Closing operator from the PDF Style
        if ($style === 'F') {
            $op='f';
        } elseif ($style === 'FD' || $style === 'DF') {
            $op='B';
        } else {
            $op='S';
        }

        // drawing
        $this->_Arc($x0, $y0, $rx, $ry, 0, 2*M_PI, true, true, true);
        $this->_out($op);
    }