請問數控銑床手工編程：如何加工壹個橢圓

G01X20Y0F0.2;

#1=1;

WHILE[#1LT360]DO1;

#2=20*COS[#1];

#3=11*SIN[#1];

G01X#2Y#3;

#1=#1+1;

DO1;

G00X50;