--------------- 函數f					-- 設置原點的偏移量
-- rot is 							-- 設置旋轉角度
-- scale is (1, 1);	               -- 設置橫坐標和縱坐標的比例
origin is (333,350);
for T from 0 to 200 step 1 draw (t, 0);		-- 橫坐標的軌跡
for T from 0 to 180 step 1 draw (0, -t);	-- 縱坐標的軌跡
for T from 0 to 150 step 1 draw (t, -t);	-- 函數f(t)=-t的軌跡
for T from 0 to 2*PI step PI/50 draw (cos(t),sin(t));