--------------- 函數f												
origin is (200,200);                   -- 設置原點的偏移量
scale is (1, 1);	               -- 設置橫坐標和縱坐標的比例
rot is 0 ;                              -- 設置旋轉角度
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

	 
scale is (100, 100);
for T from 0 to 2*PI step PI/1000 draw (cos(t),sin(t));  --畫圓

scale is (100, 100);
for T from 0 to 150 step 1 draw (t, t);