feat: semantices

test.sfdl

@@ -1,6 +1,32 @@
-origin is (100, 300);
-rot is 0;
-scale is (1, 1);
 
--- 画一个简单的函数
-for t from 0 to 10 step 0.5 draw (t, t*t);
+-- Arrow
+-- color is (255,255,0);
+
+scale is (1, 1);
+-- size is 10;
+
+origin is (450, 450);
+rot is pi;
+for t from 0 to 400 step 1 draw( t, t );
+
+
+-- 心形曲线
+
+origin is (200, 200);
+rot is pi/2;
+-- size is 5;
+
+-- 圆润型
+-- color is blue;
+scale is (50, 50);
+for t from -pi to pi step pi/200 draw((2*cos(t) - cos(2*t)),  (2*sin(t)-sin(2*t))  );
+
+-- 尖锐型
+origin is (200+80, 200+80);
+-- color is red;
+rot is pi;
+scale is (8, 8);
+for t from 0 to 2*pi  step pi/200 draw( 
+            16*(sin(t)**3),  
+			13*cos(t) - 5*cos(2*t) - 2*cos(3*t)-cos(4*t)
+	  );