dashed_circle example

turtle-lib/examples/dashed_circle.rs

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+//! Dashed circle example ported from sunjay/turtle
+//! This draws a dashed circle but uses `circle_left` arcs for each segment instead of individual short lines.
+
+use turtle_lib::{turtle_main, vec2, CurvedMovement, Turnable};
+
+#[turtle_main("Dashed Circle")]
+fn draw(turtle: &mut TurtlePlan) {
+    // Circle parameters
+    let radius = 120.0_f32;
+    let number_of_dashes = 24;
+    let segments_angle = 360 / number_of_dashes;
+    let steps_per_arc = 6; // number of steps to tessellate each small arc
+
+    // Position turtle at circle start
+    turtle
+        .reset()
+        .pen_up()
+        .go_to(vec2(radius, 0.0))
+        .pen_down()
+        .left(90.0);
+
+    for i in 0..number_of_dashes {
+        // Determine whether current group is drawing or skipping
+        let draw_segment = usize::is_multiple_of(i, 2);
+
+        if draw_segment {
+            turtle.pen_down();
+        } else {
+            turtle.pen_up();
+        }
+
+        // Draw a small arc using circle_left. Each call advances the heading by segment_angle.
+        turtle.circle_left(radius, segments_angle as f32, steps_per_arc);
+    }
+}