return ("M" + ix0 + "," + iy0) + ("A" + r1 + "," + r1 + ",0," + this.is_long + ",0," + ix1 + "," + iy1) + ("L" + ox1 + "," + oy1) + ("A" + r2 + "," + r2 + ",0," + this.is_long + ",1," + ox0 + "," + oy0) + "Z";