normalizing angles to prevent drift

also move the at least one frame check to the AnimationSpeed creation.

turtle-lib-macroquad/examples/koch.rs

@@ -23,17 +23,17 @@ async fn main() {
     let mut plan = create_turtle();
 
     // Position turtle
+    plan.set_speed(1001);
     plan.pen_up();
     plan.backward(150.0);
 
     plan.pen_down();
-    plan.set_speed(10000);
 
     // Draw Koch snowflake (triangle of Koch curves)
     for _ in 0..3 {
         koch(4, &mut plan, 300.0);
         plan.right(120.0);
-        plan.set_speed(1000);
+        plan.set_speed(1200);
     }
 
     plan.hide(); // Hide turtle when done

turtle-lib-macroquad/examples/stern.rs

@@ -8,10 +8,11 @@ async fn main() {
     // Create a turtle plan
     let mut plan = create_turtle();
     plan.shape(ShapeType::Turtle);
-    plan.set_speed(800);
+    plan.set_speed(1500);
+    plan.set_pen_width(0.5);
 
-    // Draw a square
-    for _ in 0..5 {
+    // Draw a 5-pointed star pattern repeatedly
+    for _i in 0..50000 {
         plan.forward(200.0);
         plan.circle_left(10.0, 72.0, 1000);
         plan.circle_right(5.0, 360.0, 1000);