some more examples

turtle-lib/examples/empty_star.rs

@@ -0,0 +1,26 @@
+//! Draw an empty 5-pointed star using straight lines.
+//! Ported from the turtle crate example.
+
+use turtle_lib::*;
+
+#[turtle_main("Empty Star")]
+fn draw(turtle: &mut TurtlePlan) {
+    let points = 5.0;
+    let angle = 180.0 / points;
+
+    turtle
+        .set_pen_width(4.0)
+        .set_pen_color(YELLOW)
+        .pen_up()
+        .forward(150.0)
+        .right(180.0 - angle / 2.0)
+        .pen_down();
+
+    for _ in 0..5 {
+        turtle
+            .forward(100.0)
+            .left(angle * 2.0)
+            .forward(100.0)
+            .right(180.0 - angle);
+    }
+}