написал функцию рисования полигона по центру холста

src/main.rs

@@ -7,17 +7,18 @@ fn polygon(corners_number: u32, steps_count: u32, output_path: &'static str) {
     let mut turtle = Turtle::new();
     let default_pos = defaults::position();
 
-    let degree = 360.0 / corners_number as f64;
+    let side_length = turtle.step_length() * steps_count;
-    let circumference = (corners_number * steps_count * defaults::STEP_LENGTH) as f64;
+    let pi = std::f64::consts::PI;
-    let radius = circumference / (2.0 * std::f64::consts::PI);
+    let circumscribed_circle_radius = side_length as f64 / (2.0 * (pi / corners_number as f64).sin());
+    let vertical_offset = circumscribed_circle_radius * (pi / corners_number as f64).cos();
 
     turtle.set_pos((
-        default_pos.0 - (turtle.step_length() * steps_count / 2) as i32,
+        default_pos.0 - (side_length / 2) as i32,
-        default_pos.1 - radius as i32
+        default_pos.1 - vertical_offset as i32,
     ));
     
     for _ in 0..corners_number {
-        turtle.forward_right(steps_count, degree);
+        turtle.forward_right(steps_count, 360.0 / corners_number as f64);
     }
     turtle.save(output_path).unwrap();
 }